Potential of a Combination of UASB and DHS Reactor as a Novel Sewage Treatment System for Developing Countries: Long-Term Evaluation

Tandukar, Madan; Machdar, Izarul; Uemura, Shigeki; Ohashi, Akiyoshi; Harada, Hideki

doi:10.1061/(asce)0733-9372(2006)132:2(166)

Cited by 80 publications

(42 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Contudo, Chernicharo et al (2005) mostram que, quando considerados os custos de operação associados às tecnologias de tratamento investigadas (valor presente -dez anos), o custo total das unidades reacionais que constituem o sistema UASB/ FBP passa a ser substancialmente menor, principalmente em função da menor demanda energética atribuída ao sistema UASB/FBP. Considerando as principais vantagens associadas aos sistemas UASB/FBP (menor demanda energética e maior simplicidade operacional), tal tecnologia tem sido frequentemente incluída em estudos de concepção de estações de tratamento de esgoto doméstico (ETE) no contexto do Brasil, sendo tal combinação possivelmente aplicável em outros países em desenvolvimento (KASSAB et al, 2010;LETTINGA, 2010 et al,1994;WANNER et al, 1996;OAKLEY et al, 2000;RAGAS et al, 2005).…”

Section: Descrição Do Aparato Experimentalunclassified

Operação de filtros biológicos percoladores pós-reatores UASB sem a etapa de decantação secundária

Almeida

Oliveira²,

Chernicharo³

2011

Eng. Sanit. Ambient.

View full text Add to dashboard Cite

ResumoA pesquisa teve por objetivo avaliar filtros biológicos percoladores (FBP) pós-reatores UASB operando sem a etapa de decantação secundária, em termos da remoção da demanda bioquímica e química de oxigênio (DBO e DQO) e sólidos suspensos totais (SST). O aparato experimental consistia em um reator UASB que alimentava quatro FBP em paralelo, preenchidos com diferentes materiais suporte. O reator UASB operou em regime hidráulico permanente, e três condições operacionais foram impostas aos FBP durante o período experimental. Em geral, os sistemas UASB/FBP foram capazes de promover o atendimento aos padrões de lançamento. Em condições de baixas cargas orgânicas volumétricas (COV), o uso de materiais de enchimento de maior área superficial específica não proporcionou ganhos expressivos em termos de desempenho. Contudo, o uso de meio suporte baseado em espumas de poliuretano propiciou melhoria significativa na qualidade do efluente final. O uso de sistemas UASB/FBP sem decantadores secundários parece ser uma promissora alternativa para a simplificação operacional da tecnologia, e uma importante estratégia para o tratamento de efluentes domésticos em países em desenvolvimento. No entanto, o sucesso do emprego desta tecnologia fica condicionado ao correto gerenciamento do lodo anaeróbio do reator UASB, a fim de que sejam evitadas sobrecargas nos FBP.Palavras-chave: esgoto doméstico; filtro biológico percolador; operação sem decantadores secundários; pós-tratamento; reator UASB. AbstractThe research aimed at evaluating the operation of trickling filters (TF) post-UASB reactors without the secondary sedimentation stage, in terms of biochemical and chemical oxygen demand (BOD and COD) and total suspended solids (TSS) removal. The experimental apparatus consisted of one UASB reactor followed by four TF in parallel, each one filled with a different packing media. The UASB reactor was operated at a permanent hydraulic regime, while three operational conditions were imposed to the TF during the experimental period. In general, the UASB/TF systems were able to comply with the discharge standards. At low organic loading rates (OLR), no improvements in terms of organic matter removal, with the use of higher surface area packing media were observed.However, the use of a sponge-based packing media provided significant improvements on final effluent quality. The use of UASB/TF systems without secondary sedimentation can constitute an attractive alternative in terms of operational simplification of this technology, and an important strategy for domestic wastewater treatment in developing countries. However, the success of this technology is strictly connected to the correct anaerobic sludge management of the UASB reactor, in order to avoid overloads on the TF.

show abstract

Section: Descrição Do Aparato Experimentalunclassified

Operação de filtros biológicos percoladores pós-reatores UASB sem a etapa de decantação secundária

Almeida

Oliveira²,

Chernicharo³

2011

Eng. Sanit. Ambient.

View full text Add to dashboard Cite

show abstract

“…Performance of DHS reactor depends upon the uniformity of wastewater distribution, as it enhances the contact between the substrate and the microbes (Machdar et al, 1997(Machdar et al, , 2001Tandukar et al, 2006). The tracer study for PF-DHS reactor was performed to assess the influence of the module oil palm fiber density on the module effective volume, i.e.…”

Section: Results and Discussion Preliminary Test Of Pf-dhs Reactormentioning

confidence: 99%

“…The shape of the PF-DHS reactor was rectangular, similar to that in previous studies using PUF material (Machdar 2001, Tandukar et al, 2006. The oil palm fiber was put inside a wire mesh cover to provide a module like sponge with a module fiber density of 0.3 g dry fiber/cm 3 .…”

Section: Description Of Pf-dhs Reactor and Operational Conditionmentioning

confidence: 98%

“…One of the most important factors for aerobic reactors to achieve a good performance in treatment process is the DO concentration. DHS reactor has an advantage of needlessness of external aeration although being an aerobic system (Machdar et al, 1997;Tandukar et al, 2005Tandukar et al, , 2006. The DO level of effluent from the PF-DHS pilot plant was all the time kept around 6.3 mg/L (SD ± 0.8 mg/L) although the DO was 2.1 mg/L (SD ± 0.6 mg/L) at the inlet.…”

Section: Pf-dhs Reactor Process Performancementioning

confidence: 99%

“…Since the development of the first DHS (Downflow Hanging Sponge) reactor more than a decade ago, it has been modified to make it simpler, cost-effective, and easy to maintain as well as suitable for real application in developing countries (Agrawal et al, 1997;Machdar et al, 1997;Machdar et al, 2000;Tandukar et al, 2005;Tandukar et al, 2006). Originally, the DHS reactor is constructed by cube-shaped polyurethane foam (PUF) sponges that hang freely in the air.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modification of DHS Bioreactor Module with Oil Palm Fiber Material for Treating Domestic Wastewater

Machdar

Faisal

2011

J. of Wat. & Envir. Tech.

Self Cite

View full text Add to dashboard Cite

An oil palm fiber module has been developed to modify a down-flow hanging sponge (DHS) reactor module. The objective of the proposed system is to improve two existing DHS variants of post-treatment unit for UASB treating domestic wastewater, i.e. cube-type and curtain-type sponge as domestic wastewater treatment system for developing countries. This paper describes the potential of oil palm fiber-based DHS (PF-DHS) configuration for sewage treatment. Feasibility of the PF-DHS reactor was evaluated by conducting a six-month continuous operation using actual sewage as feed. The system has been verified to have an excellent organic removal performance achieving 67% of unfiltered COD removal, and nearly perfect SS removal at the HRT of 2 h. It was observed that the organic removal rate was approximately 2.64 kg COD/m 3 per day. The result recommended that the proposed PF-DHS reactor would be a promising system to alter sponge-based DHS for domestic wastewater treatment system in developing countries.

show abstract

Physico‐Chemical and Kinetic Evaluation of a Combined Vertical Settler/Self‐Aerated Unit for Wastewater Treatment and Reuse

El-Khateeb

2021

CLEAN Soil Air Water

View full text Add to dashboard Cite

Water resource limitation is one of the crises facing many countries worldwide. The work aims to apply a compact unit consisting of a vertical settler (VS) followed by a self‐aerated chamber (SAC) for wastewater treatment. The dimensions of the unit are 2 × 1 × 2.5 m for length, width, and height, respectively. The hydraulic retention time (HRT) is 5 h in the VS for performance study while for the kinetic study the HRT is 4, 6, 8, 10, to 12 h. The unit is packed with a non‐woven fabric material produced from waste plastic. The influent organic concentrations expressed by chemical and biological oxygen demand (CODtot and BOD) are 367.7 and 254.7 mg L−1, respectively. The concentrations of CODtot and BOD in the treated effluent are 78.8 and 80.5% to 36.7 and 16.6 mg L−1, respectively. The prevailed removal kinetic for COD and nitrogen (N) concentrations is the second‐order reaction kinetic. With the exception of fecal coliform (FC), the final treated effluent meet the National regulatory requirements. The disinfection step is essential to reuse the final treated effluent safely. The unit can serve 100 p.e. in rural and unserved areas in developing countries with area of 2–3 m2.

show abstract

Potential of a Combination of UASB and DHS Reactor as a Novel Sewage Treatment System for Developing Countries: Long-Term Evaluation

Cited by 80 publications

References 17 publications

Operação de filtros biológicos percoladores pós-reatores UASB sem a etapa de decantação secundária

Operação de filtros biológicos percoladores pós-reatores UASB sem a etapa de decantação secundária

Modification of DHS Bioreactor Module with Oil Palm Fiber Material for Treating Domestic Wastewater

Physico‐Chemical and Kinetic Evaluation of a Combined Vertical Settler/Self‐Aerated Unit for Wastewater Treatment and Reuse

Contact Info

Product

Resources

About