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O lixiviado dos aterros sanitários em estações de tratamento dos sistemas públicos de esgotos; The leachate from landfill in wastewater treatment systems public sewers

Bocchiglieri, Miriam Moreira
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 11/05/2010 PT
Relevância na Pesquisa
66.31%
O presente trabalho discute o recebimento de lixiviado de aterros sanitários em estações de tratamento do sistema público de esgotos para tratamento conjunto. Descreve os processos de geração do lixiviado nos aterros e faz uma avaliação desse recebimento em quatro estações de tratamento em operação no Estado de São Paulo que empregam processos biológicos de tratamento por lodos ativados convencional e por batelada, lagoas de estabilização (anaeróbia seguida de facultativa) e lagoas aeradas. Também apresenta a variação da produção de lixiviado em aterros sanitários em função dos períodos de chuva e seca, estabelecidos pela precipitação observada no período avaliado. Conclui que o tratamento conjunto de lixiviado de aterro é uma alternativa a ser considerada no planejamento dos sistemas de resíduos sólidos e de esgotos sanitários. A adoção do tratamento conjunto traz benefícios a esses sistemas e à sociedade, pois pode representar economia de escala, atendimento às exigências legais e conformidade ambiental, promovendo melhores condições de saúde pública; This work discuss the receipt of sanitary landfill leachate by public wastewater treatment plants for joint treatment. It describes the processes theough which leachate is generated in landfills and assesses its receipt in four wastewater treatment plants in the state of São Paulo that employ biological processes such as conventional and batch activated sludge and stabilization ponds (anaerobic pond followed by facultative pond). Additionally...

Remoção de fósforo do líquido de descarte do desaguamento do lodo de estações de tratamento de esgoto mediante precipitação de estruvita; Phosphorus removal from sludge water discharge of wastewater treatment plants by struvite precipitation

Marques, José Luciano Verçosa
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 07/10/2010 PT
Relevância na Pesquisa
66.36%
A presente pesquisa estudou a viabilidade do emprego de sais de magnésio em estações de tratamento de esgoto sanitário visando a remoção do fósforo, bem como a produção de estruvita, mineral que pode ser utilizado diretamente no solo como fertilizante. As estações estudadas nesta pesquisa foram a Estação de Tratamento de Esgoto Sanitário de Franca-SP e a Estação de Tratamento de Esgoto Sanitário Jardim das Flores, localizada no município de Rio Claro-SP, e a Estação de Tratamento de Esgoto Sanitário Piçarrão, no município de Campinas. No caso da ETE Jardim das Flores (Rio Claro-SP), observou a possibilidade do emprego de sais de magnésio para se remover fósforo no efluente dos reatores UASB. Com ensaios de Jar-Test, atingiu-se cerca 49% de remoção de fosfato na amostra precipitada por gravidade e cerca de 90% na amostra centrifugada. No caso da ETE-Franca-SP, constatou-se, apesar do emprego de sais de magnésio não ter sido viável, verificou-se os benefícios do emprego de cloreto férrico em estações de tratamento de esgoto sanitário.; The present research studied the use of magnesium salts to remove phosphorus. With the phosphorus removal, magnesium salts, produce, as well, struvite, mineral that can be use directly on soil as fertilizer. The wastewater treatment plants objects of studies in this research was Wastewater Treatment Plant of Franca (SABESP) city Wastewater Treatment Plant of Jardim das Flores (Foz do Brasil)...

Avaliação da remoção de Giardia spp. e Cryptosporidium spp. em processos de tratamento de esgoto sanitário; Assessment of removal of Giardia spp. and Cryptosporidium spp. from wastewater treatment processes

Medeiros, Raphael Corrêa
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 27/09/2013 PT
Relevância na Pesquisa
66.33%
Este trabalho teve o intuito de avaliar a eficiência de remoção de protozoários patogênicos - Giardia spp. e Cryptosporidium spp. - em processos de tratamento de esgoto sanitário por reator UASB, lodos ativados, filtro lento em areia e diferentes desinfetantes. A recuperação de cistos de Giardia e de oocistos de Cryptosporidium, realizada por diferentes metodologias e utilizando ColorSeed®, foi de, respectivamente, 85 e 20% em esgoto bruto, e 62,5 e 17,5% em efluente tratado, quando foi utilizado o método de tripla centrifugação. Cistos de Giardia foram encontrados em 100% as amostras de esgoto pesquisadas, com média de 1,5 x 104 cistos por litro e oocistos de Cryptosporidium em 31,4% com média 3,1 x 10² oocistos por litro, em esgoto bruto. No tratamento biológico por reator UASB seguido de Lodos Ativados, a remoção de cisto de Giardia e esporos de Clostridium perfringens foram estatisticamente menores que as remoções de E. coli e coliformes totais. Não foram encontrados (oo)cistos após o tratamento terciário realizado através da filtração lenta em areia. Houve remoção estatisticamente maior na ETE em escala plena para coliformes totais e Clostridium perfringens. E. coli e cistos de Giardia, em ambas ETEs...

Energy-saving wastewater treatment systems : formulation of cost functions

Nogueira, R.; Ferreira, I.; Janknecht, P.; Rodríguez, Juan José; Oliveira, Pedro; Brito, A. G.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em 23/09/2006 ENG
Relevância na Pesquisa
66.33%
Natural interactions between water, soil, atmosphere, plants and microorganisms include physical, chemical and biological processes with decontaminating capacities. Natural or energy-saving wastewater treatment systems utilize these processes and thereby enable a sustainable management in the field of wastewater treatment, offering low investment and operation costs, little or no energy consumption, little and low-skill labor requirements, good landscape integration and excellent feasibility for small settlements, especially when remote from centralized sewer systems. The objective of this work is the development of cost functions for investment and operation of energy-saving wastewater treatment technologies. Cost functions are essential for making cost estimations based on a very reduced number of variables. The latter are easily identified and quantified and have a direct bearing on the costs in question. The formulated investment and operation cost functions follow a power law, and the costs decrease with the increase of the population served. The different energysaving wastewater treatment systems serving small population settlements, between 50 p.e. and 250 p.e., present associated investment costs varying from 400 €/p.e. to 200 €/p.e. and annual operation costs in the range of 70 €/p.e. to 20 €/p.e....

Energy-saving wastewater treatment systems : formulation of cost functions

Nogueira, R.; Ferreira, I.; Janknecht, P.; Rodríguez, Juan José; Oliveira, Pedro; Brito, A. G.
Fonte: IWA Publishing 2007 Publicador: IWA Publishing 2007
Tipo: Artigo de Revista Científica
Publicado em //2007 ENG
Relevância na Pesquisa
66.33%
Natural interactions between water, soil, atmosphere, plants and microorganisms include physical, chemical and biological processes with decontaminating capacities. Natural or energy-saving wastewater treatment systems utilize these processes and thereby enable a sustainable management in the field of wastewater treatment, offering low investment and operation costs, little or no energy consumption, little and low-skill labor requirements, good landscape integration and excellent feasibility for small settlements, especially when remote from centralized sewer systems. The objective of this work is the development of cost functions for investment and operation of energysaving wastewater treatment technologies. Cost functions are essential for making cost estimations based on a very reduced number of variables. The latter are easily identified and quantified and have a direct bearing on the costs in question. The formulated investment and operation cost functions follow a power law, and the costs decrease with the increase of the population served. The different energy-saving wastewater treatment systems serving small population settlements, between 50 p.e. and 250 p.e., present associated investment costs varying from 400 e/p.e. to 200 e/p.e. and annual operation costs in the range of 70 €/p.e. to 20 €/p.e....

Economic and environmental assessment of small and decentralized wastewater treatment systems

Nogueira, R.; Brito, A. G.; Machado, A. Patrícia; Salas, J. J.; Vera, L.; Martel, G.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em 11/11/2007 ENG
Relevância na Pesquisa
66.34%
The aim of the present work was the assessment of economic and environmental aspects of decentralised energy-saving wastewater treatment systems. The formulated investment and operation cost functions were adjusted by a power law function. The different wastewater systems serving population settlements between 50 p.e. and 250 p.e., presented associated investment costs varying from 400 €/p.e. to 200 €/p.e. and annual operation costs in the range of 70 €/p.e. to 20 €/p.e., respectively. A Life Cycle Analysis approach was used to compare the environmental impact alternative wastewater systems. The assessment was focused on two energy-saving systems (constructed wetland and slow rate infiltration) and a conventional one (activated sludge process). The low environmental impact of the energy-saving wastewater treatment systems was demonstrated, being the most relevant the global warming indicator. Options for reduction of life cycle impacts were assessed including materials used in construction and operation lifetime of the systems. A 10 % extension of operation lifetime of constructed wetland and slow rate infiltration systems lead to a 5 % and 7 % decrease in the abiotic depletion indicator, respectively, and to a 1 % decrease in CO2 emissions in both systems. Replacing steel with HDPE in the activated sludge tank resulted in a 1 % reduction in CO2 emission and 1 % in the abiotic depletion indicator. In the case of the Imhoff tank a 1 % reduction in CO2 emissions and 5 % in abiotic depletion indicator were observed when concrete was replaced by HDPE. Therefore...

Economic and environmental assessment of small and decentralized wastewater treatment systems

Nogueira, R.; Brito, A. G.; Machado, A. Patrícia; Janknecht, P.; Salas, J. J.; Vera, L.; Martel, G.
Fonte: Desalination Publications Publicador: Desalination Publications
Tipo: Artigo de Revista Científica
Publicado em /04/2009 ENG
Relevância na Pesquisa
66.35%
The aim of the present work was the assessment of economic and environmental aspects of decentralized energy-saving wastewater treatment systems. The formulated investment and operation cost functions were adjusted by a power law function. The different wastewater systems serving population settlements between 50 p.e. and 250 p.e., presented associated investment costs varying from €400/p.e. to €200/p.e. and annual operation costs in the range of €70/p.e.– €20/ p.e., respectively. A life cycle analysis approach was used to compare the environmental impact of alternative wastewater treatment systems. The assessment was focused on two energy-saving systems (constructed wetland and slow rate infiltration) and a conventional one (activated sludge process). Low environmental impact of energy-saving wastewater treatment systems was demonstrated, being the most relevant the global warming indicator. Options for reduction of life cycle impacts were assessed including materials used in construction and operation lifetime of the systems. A 10% extension of operation lifetime of constructed wetland and slow rate infiltration systems lead to a 5% and 7% decrease in the abiotic depletion indicator, respectively, and to a 1% decrease in CO2 emissions in both systems. Replacing steel with HDPE in the activated sludge tank resulted in a 1% reduction in CO2 emission and 1% in the abiotic depletion indicator. In the case of the Imhoff tank a 1% reduction in CO2 emissions and 5% in abiotic depletion indicator were observed when concrete was replaced by HDPE. Therefore...

Factors influencing antibiotic resistance burden in municipal wastewater treatment plants

Novo, Ana; Manaia, Célia M.
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
Publicado em //2010 ENG
Relevância na Pesquisa
66.34%
Municipal wastewater treatment plants are recognized reservoirs of antibiotic-resistant bacteria. Three municipal wastewater treatment plants differing on the dimensions and bio-treatment processes were compared for the loads of amoxicillin-, tetracycline-, and ciprofloxacinresistant heterotrophic bacteria, enterobacteria, and enterococci in the raw inflow and in the treated effluents. The sewage received by each plant, in average, corresponded to 85,000 inhabitant equivalents (IE), including pretreated industrial effluents (≤30%) in plant activated sludge, 105,000 IE, including pretreated hospital effluents (≤15%) in plant trickling filter, and 2,000 IE, exclusively of domestic sewage, in plant submerged aerated filter. The presence of pretreated industrial effluents or of pretreated hospital sewage in the raw inflow did not imply significantly higher densities (per milliliter or per IE) of antibiotic-resistant bacteria in the raw wastewater. Longer hydraulic residence periods (24 h) corresponded to higher bacterial removal rates than shorter periods (12 and 9 h), although such efficiency did not imply significant average decreases in the antibiotic resistance prevalence of the treated effluent. The bacterial loads in the treated effluent could be ranked according to the treatment efficiency...

Winery wastewater treatment : evaluation of the air micro-bubble bioreactor performance

Oliveira, Margarida; Duarte, E.
Fonte: InTech Publicador: InTech
Tipo: Parte de Livro
Publicado em //2011 ENG
Relevância na Pesquisa
66.32%
The wine sector has faced increasing pressure in order to fulfill the legal environmental requirements, maintaining a competitive position in a global market. The rising costs associated have stimulated the sector to seek sustainable management’s strategies, focussing on controlling the demand for water and improving its supply.Some EU Directives were implemented concerning water protection and management. These included in particular the Framework Directive in the field of water policy and environmental legislation about specific uses of water and discharges of substances.Several winery wastewater treatments are available, but the development of alternative technologies is essential to increase their efficiency and to decrease the investment and exploration costs.The main goals of the present paper are the comparison of different biological treatment systems, in particular fixed and suspended biomass, operating under aerobic conditions. Since the accurate design of the bioreactor is dependent on many operational parameters, aspects related to hydraulic retention time; oxygen mass transfer and contact time, energetic costs; sludge settling and production; response time during startup, flexibility and treated wastewater reuse...

Microalgae for urban wastewater treatment and fermentative biohydrogen production

Graça, Sofia; Batista, Ana Paula; Sousa, Catarina; Ambrosano, Lucas; Ribeiro, Belina; Marques, Paula Alexandra; Gouveia, L.
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 ENG
Relevância na Pesquisa
66.39%
Concerns about climate changes and global water crisis are increasing, considering the low freshwater resources, pollution, and changes in the hydrological cycle. Therefore, water is a precious scarce resource being crucial to develop wastewater treatment and recovery processes to improve water resources management. On the other hand, the problematic of fossil fuels leads to its replacement by biofuels. Thus there are studies [1] to combine wastewater treatment with microalgal biomass as 3rd generation biofuel sources. This study pretends to apply the biorefinery concept to an innovative photobioreactor (PBR) to treat wastewater with microalgae and later valorise the biomass by producing biohydrogen. It is intended to reduce CO2, phosphorus, nitrogen, ammonium and other pollutants presents in wastewater, according EC targets, since microalgae consume the nutrients for growth thus removing them from the wastewater. Within the WW-SIP Life project, a new type of PBR for urban waste water treatment plant (UWWTP) effluents has been designed and will be scaled up. The tubular vertical PBR prototype (150 L) placed outdoor has an air compressor to perform agitation, a membrane module to permeate the treated water and a settler to concentrate the biomass. The results will be used to scale up a PBR of 1500 L. The PBR was fed with primary effluent from Águas da Figueira (PT) UWWTP and inoculated with Chlorella vulgaris...

Aquaponics and its potential aquaculture wastewater treatment and human urine treatment

Sánchez, Henrique Junior Aiveca
Fonte: Universidade Nova de Lisboa Publicador: Universidade Nova de Lisboa
Tipo: Dissertação de Mestrado
Publicado em /09/2014 ENG
Relevância na Pesquisa
66.35%
The main objective of this thesis is to study the developing fields of aquaponics and its potential for aquaculture wastewater treatment and human urine treatment. Aquaponics is a food production system which combines fish farming (aquaculture) with soilless crop farming (hydroponics). In this thesis the concept of aquaponics and the underlying processes are explained. Research on aquaculture wastewater and human urine wastewater is reviewed and its potential application with aquaponic systems is studied. An overview of the different types of aquaponic systems and current research on the field is also presented. A case study was conducted in a farm in Askeröd, Sweden, which involved building two aquaponic systems (System 1 and System 2) and a human urine-based aquaponic system (System 3), with different degrees of component complexity and sizes. The design, building and monitoring of System 1, System 2 and System 3 was documented and described in detail. Four day experiments were conducted which tested the evolution in concentration of Total Ammonia Nitrogen (NH4+/NH3), Nitrite (NO2-), Nitrate (NO3-), Phosphate (PO43-), and Dissolved Oxygen (O2) after an initial nutrient input. The goal was to assess the concentrations of these parameters after four days and compare them with relevant literature examples in the aquaculture industry and in source-separated urine research. Neither of the two aquaponic systems (System 1 and System 2) displayed all of the parameter concentrations in the last day of testing below reference values found in literature. The best performing of the aquaponic systems was the more complex system (System 2) combining the hydroponic Nutrient Film Technique with a Deep Water Culture component...

Energy efficiency optimisation of wastewater treatment: study of ATAD

Hernandez, Jamie Rojas
Fonte: University of Limerick Publicador: University of Limerick
Tipo: Doctoral thesis; all_ul_research; ul_published_reviewed; ul_theses_dissertations; none
ENG
Relevância na Pesquisa
66.34%
peer-reviewed; The aim of this investigation was to minimise the energy requirement of autothermal thermophilic aerobic digestion (ATAD) systems while complying with treatment objectives. Due to the discontinuous, semi-batch nature of the ATAD reaction, these systems have to be optimised via dynamic optimisation. To this end, two dynamic ATAD models were developed: ATM1 and ATM2. These models have the novel and unique feature that they are capable of quantifying the two treatment objectives, i.e., stabilisation and pasteurisation. Thereby, they are also able to determine the minimum energy requirement needed to satisfy legal standards. Simulation studies were carried out to examine model behaviour of different ATAD systems at start-up and steady state operation. Overall, the behaviour ob- served in the simulations was in good qualitative agreement with the behaviour of full-scale plants. In an asymptotic analysis of the ATM1 model, the general, quali- tative structure of the solution was studied. The structure is composed of a number of regions which are limited by different factors: first by the availability of dissolved oxygen, second by readily biodegradable substrate, and nally by slowly biodegradable substrate. The structure of the solution can explain the qualitative behaviour of respirometric curves of ATAD systems. A global sensitivity analysis was carried out to identify the model parameters with the strongest in uence on energy requirement and plant capacity. In this context...

Use of filamentous fungi for wastewater treatment and production of high value fungal byproducts: A review

Sankaran, S.; Khanal, S.; Jasti, N.; Jin, B.; Pometto III, A.; Van Leeuwen, J.
Fonte: CRC Press LLC Publicador: CRC Press LLC
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
Relevância na Pesquisa
66.45%
Conventional biological wastewater treatment generates large amounts of low value bacterial biomass. The treatment and disposal of this excess bacterial biomass, also known as waste activated sludge, accounts for about 40-60% of the wastewater treatment plant operation cost. A different form of biomass with a higher value could significantly change the economics of wastewater treatment. Fungi could offer this benefit over bacteria in wastewater treatment processes. The biomass produced during fungal wastewater treatment has, potentially, a much higher value than that from the bacterial activated sludge process. The fungi can be used to derive valuable biochemicals and can also be used as a protein source. Various high-value biochemicals are produced by commercial cultivation of fungi under aseptic conditions using expensive substrates. Food-processing wastewater is an attractive alternative as a source of low-cost organic matter and nutrients to produce fungi with concomitant wastewater purification. This review summarizes various findings in fungal wastewater treatment, particularly focusing on byproduct recovery during wastewater treatment. This review also provides an overview on performance of fungal treatment systems under various operational conditions. Important factors such as pH...

Transformation of PVP coated silver nanoparticles in a simulated wastewater treatment process and the effect on microbial communities

Doolette, C.; McLaughlin, M.; Kirby, J.; Batstone, D.; Harris, H.; Ge, H.; Cornelis, G.
Fonte: BioMed Central Ltd Publicador: BioMed Central Ltd
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
66.4%
Background: Manufactured silver nanoparticles (AgNPs) are one of the most commonly used nanomaterials in consumer goods and consequently their concentrations in wastewater and hence wastewater treatment plants are predicted to increase. We investigated the fate of AgNPs in sludge that was subjected to aerobic and anaerobic treatment and the impact of AgNPs on microbial processes and communities. The initial identification of AgNPs in sludge was carried out using transmission electron microscopy (TEM) with energy dispersive X-ray (EDX) analysis. The solid phase speciation of silver in sludge and wastewater influent was then examined using X-ray absorption spectroscopy (XAS). The effects of transformed AgNPs (mainly Ag-S phases) on nitrification, wastewater microbial populations and, for the first time, methanogenesis was investigated. Results: Sequencing batch reactor experiments and anaerobic batch tests, both demonstrated that nitrification rate and methane production were not affected by the addition of AgNPs [at 2.5 mg Ag L-1 (4.9 g L-1 total suspended solids, TSS) and 183.6 mg Ag kg -1 (2.9 g kg-1 total solids, TS), respectively]. The low toxicity is most likely due to AgNP sulfidation. XAS analysis showed that sulfur bonded Ag was the dominant Ag species in both aerobic (activated sludge) and anaerobic sludge. In AgNP and AgNO3 spiked aerobic sludge...

Review of Community-Managed Decentralized Wastewater Treatment Systems in Indonesia

Eales, Kathy; Blackett, Isabel; Siregar, Reini; Febriani, Evi
Fonte: World Bank, Washington, Dc Publicador: World Bank, Washington, Dc
Tipo: Publications & Research :: Working Paper
ENGLISH; EN_US
Relevância na Pesquisa
66.48%
Effective management of sanitation and wastewater is a growing challenge in dense urban settlements. Rapidly increasing urbanization and, along with that, rising settlement densities in low-income urban and peri-urban areas highlight the need for sanitation technologies and management systems that are robust and affordable, and which lessen the pollution load on local water sources. In many developing countries, centralized sewerage and wastewater treatment systems cover only a portion of larger urban areas, and are often not yet planned for smaller towns and densely populated, low-income areas of cities. On-site sanitation is often inappropriate in the denser settlements and slum areas, thus requiring intermediate and complementary solutions. Decentralized wastewater treatment systems (DEWATS) connected to simplified sewer systems or communal sanitation centers have the potential to close the gap between on-site and centralized systems. Community-managed DEWATS offer the possibility of swift sanitation improvements in high priority neighborhoods that communities can manage themselves...

Tratamento de esgoto sanitario em reator anaerobio preenchido por casca de coco verde (Cocos nucifera) combinado com filtro de areia; Wastewater treatment through an anaeroboc filter filled up with coco nuts (cocos nucifera) combined with sand filter

Luana Mattos de Oliveira Cruz
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 26/02/2009 PT
Relevância na Pesquisa
66.32%
O desenvolvimento de sistemas de tratamento de esgoto, eficientes e adaptáveis às condições econômicas e estruturais de uma região seria uma opção para diminuir o problema da escassez de água, já que o efluente poderia ser reutilizado ou descartado nos corpos hídricos. Ainda, com o esgotamento sanitário, os problemas de saúde pública e do meio ambiente seriam menos agravantes. Frente a esta situação, o objetivo deste projeto foi estudar um sistema para o tratamento de esgoto doméstico de pequenas comunidades, composto por filtros anaeróbios seguidos por filtros de areia. Avaliou-se o desempenho de dois filtros anaeróbios com fluxos ascendentes e preenchidos com cascas de coco verde (Cocos nucifera) e de quatro filtros de areia com espessura de 0,75m. A partida dos reatores anaeróbios foi diferente pois um deles foi inoculado. O Tempo de Detenção Hidráulico (TDH) estudado variou de 12 horas até 3 horas. Nos quatro filtros de areia foram aplicadas diferentes taxas hidráulicas (300, 400, 500 e 600 Lm-2dia) com a finalidade de se encontrar a capacidade limite de aplicações diárias, mantendo seu efluente com qualidade compatível a legislações brasileiras, como o CONAMA 357. A avaliação dos reatores anaeróbios...

Tratamento de efluente da indústria de coco utilizando os processo de Fenton e eletroquímico; Wastewater treatment industry coconut using the processes of Fenton and electrochemical

Gomes, Lúcio de Moura
Fonte: Universidade Federal de Alagoas; Brasil; Programa de Pós-Graduação em Engenharia Química; UFAL Publicador: Universidade Federal de Alagoas; Brasil; Programa de Pós-Graduação em Engenharia Química; UFAL
Tipo: Dissertação
POR
Relevância na Pesquisa
66.32%
Nowadays, the food industry is one of activities that fastest growing on the planet due to the demand for food, which ends up generating a lot of waste solids, liquids and gases that can contaminate / pollute water and soil. One of the food industry which generates a significant amount of waste is the coconut processing industry. In order to minimize the environmental impact is necessary to use some techniques in treatment of this wastewater that are efficient and economically viable. Between these techniques currently being studied, Advanced Oxidation Processes (AOPs) have received considerable attention due to the high efficiency in wastewater treatment and low operating cost. Among the AOPs, the application of the Fenton reaction and the Electrochemical process has been outstanding. These techniques have low toxicity and high efficiency for the mineralization of most organic pollutant compounds. However, due to the complexity of some effluents, the application of a single technique is not sufficient to adjust the effluent for disposal, thus, the association of the electrochemical technology and the Fenton reaction makes the process still more promising. The objective of this study was to evaluate the application of the Fenton reaction and the electrochemical process to treat wastewater generated by the coconut industry by applying the individual processes and associates. In this study was treated a synthetic wastewater composed of a mixture of coconut milk / water...

Generación de bioaerosoles en estaciones depuradoras de aguas residuales; Bioaerosol generation at wastewater treatment plants

Sánchez-Monedero, Miguel Ángel; Aguilar, María Isabel; Fenoll, Rocío; Roig, Asunción
Fonte: Universidad Autónoma de Yucatán Publicador: Universidad Autónoma de Yucatán
Tipo: Artículo Formato: 62041 bytes; application/pdf
SPA
Relevância na Pesquisa
66.35%
[ES] Las operaciones que habitualmente tienen lugar en las estaciones depuradoras de aguas residuales dan lugar a la formación de bioaerosoles, o partículas aerotransportables de origen biológico, que en el caso de ser inhalados, pueden suponer un riesgo para la salud tanto para los operarios de la planta como para los habitantes de zonas residenciales vecinas. Se realizó en este trabajo un estudio en una estación depuradora de aguas residuales con el objetivo de identificar los principales focos de emisión y cuantificar los niveles de bioaerosoles generados en distintas zonas de la planta de tratamiento. Se seleccionaron 10 puntos críticos en los que se realizó un recuento total de bacterias aerotransportables utilizando un muestreador por impacto sobre una superficie de agar nutritivo, que fue usado como medio de cultivo. Los principales focos de emisión de bioaerosoles fueron localizados en el edificio de entrada de agua cruda, el reactor biológico y el edificio de deshidratación de lodos, donde se registraron concentraciones de bacterias mesófilas en el aire de 1787, 450 y 2330 unidades formadoras de colonia por metro cúbico de aire (UFC /m3), respectivamente. Estos valores son significativamente superiores a los registrados en las zonas más alejadas de las operaciones de tratamiento del agua residual (consideradas como control)...

Microbial Impacts of Selected Pharmaceutically Active Compounds Found in Domestic Wastewater Treatment Plants

Wang, Shuyi
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Dissertação Formato: 2262475 bytes; application/pdf
Publicado em //2009 EN_US
Relevância na Pesquisa
66.34%

Large amounts of human pharmaceutical products are consumed worldwide. Many drugs and their metabolites, referred to as pharmaceutically active compounds (PhACs), are not fully metabolized prior to household discharge resulting in their common occurrence in wastewater treatment plants (WWTPs). In most instances, WWTPs present the first treatment opportunity for removing PhACs and preventing significant environmental exposure. Because most municipal WWTPs rely on the microbial component of the activated sludge process, there is a need to estimate the influence of PhACs in wastewater influent on the activated sludge microbial communities and the treatment performance of WWTPs. The objective of this dissertation was to determine the impact of selected PhACs (i.e., ketoprofen, naproxen, clofibric acid, carbamazepine and gemfibrozil) on activated sludge microorganisms and key individual microbial species in domestic wastewater treatment. Analyses were performed in batch reactors initially and then in laboratory-scale sequencing batch reactors (SBR) which mimic WWTP operations. Ammonia oxidizing bacteria (AOB) were selected as indicator organisms because of their importance in wastewater treatment and demonstrated sensitiveness to toxic compounds.

The batch experiments results suggested that microbial growth inhibition was correlated to organic loadings. In the presence of 0.2% (v/v) ethanol...

LAUNCHING OF A NEW ONSITE WASTEWATER TREATMENT TECHNOLOGY

Castillo, Sergio
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 26/04/2013
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Abstract LAUNCHING OF A NEW ONSITE WASTEWATER TREATMENT TECHNOLOGY by Sergio J. Castillo May, 2013 Through this paper, I aim to conduct a thorough evaluation of the market, regulatory environment and competition within the Onsite Wastewater Treatment Systems (OWTS) industry, with the intention to validate and determine the viability of launching a new onsite wastewater treatment technology known as the Water Effluent Treatment (WET) System. Historically, US wastewater treatment has been performed by centralized wastewater treatment systems. However, these systems imply high infrastructure and maintenance costs, along with lacking the ability to adequately address storm surges and adapt to growing environmental issues and technological innovations. As a solution, the industry is rapidly shifting towards OWTS. The U.S. market represents the largest and highest growth market for OWTS worldwide. On-Site U.S. sewage facilities collect, treat and release an estimated 4 billion gallons of treated effluent per day. Increased frequency of storm surges, a decaying infrastructure, population increase and poor water treatment practices have created a national environmental crisis in water quality. There is a growing concern and recognition of the impact of inadequate wastewater treatment on ground and surface water quality. Enhanced by the lack of budgets to improve wastewater treatment infrastructure...