A septic tank‐UASB combined system for domestic wastewater treatment: a pilot test

Lohani, Sunil Prasad; Bakke, Rune; Khanal, Sanjay Nath

doi:10.1111/wej.12154

Cited by 9 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This hypothesis was corroborated by the observed decreased in the reactor's hydraulic performance and in methane degassing. Similar problems have been previously reported [28]; the same authors observed a COD accumulation of 25% (referred to COD influent load) and a COD conversion to methane of only 33%. Fig.…”

Section: Cod Loading Rate Cod Removal Efficiencies Effluent Concentsupporting

confidence: 87%

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Wasielewski¹,

Morandi²,

Mouarkech³

et al. 2017

Desalination and Water Treatment

View full text Add to dashboard Cite

a b s t r ac tThe performance of two pilot-scale anaerobic reactors for blackwater co-digestion was studied as an attempt to investigate the transition of current wastewater infrastructures to source-separated sanitation. The focus of this study was to assess the feasibility of blackwater co-digestion at conventional wastewater treatment plants. Two scenarios were investigated; in scenario one, blackwater was co-digested with municipal sewage sludge in a 630 L continuous stirred-tank reactor (CSTR). In scenario two, blackwater was digested alongside high-strength municipal wastewater (concentration peak) in a 720 L upflow anaerobic sludge blanket (UASB) reactor. For CSTR operation, increasing methane yields from 222 to 332 L CH 4 kg/COD removed were achieved by enhancing the blackwater fraction at the reactor inlet from 0% to 35% (% total influent load as COD BW /COD tot ). The observed COD removal ranged from 60% to 78% at 0.9-1.6 kg COD/(m³·d). For UASB operation, COD removals of 57%-67% were reported at COD loading rates of 6.1-8.4 kg/(m 3 d). Removal of organic matter was successfully carried out in both reactors, yet blackwater co-digestion alongside raw sludge (CSTR) proved to be more advantageous to the plant in terms of overall biogas production. The results also indicate that municipal digesters can be successfully integrated in transition strategies for resource-oriented sanitation, thus potentially increasing energy utilization in the plant.

show abstract

Section: Cod Loading Rate Cod Removal Efficiencies Effluent Concentsupporting

confidence: 87%

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Wasielewski¹,

Morandi²,

Mouarkech³

et al. 2017

Desalination and Water Treatment

View full text Add to dashboard Cite

show abstract

“…Since upflow anaerobic sludge blanket (UASB) reactors are widely applied in Brazil (Lohani et al . ), the wastewater treatment was analysed using this technology, followed by an anaerobic filter as an additional treatment step. The costs for implementation of the WWTPs were based on the analysis made by Pacheco () using several UASB + anaerobic filters which are installed in Brazil.…”

Section: Methodsmentioning

confidence: 99%

Case study on the use of a combined system as an intermediate solution in Brazil: cost estimate

Goncalves

Kleidorfer

Rauch

2017

Water & Environment J

View full text Add to dashboard Cite

As a developing country, Brazil has to deal with a lack of basic sanitation. One of the major challenges is the treatment of wastewater. While 94% of Brazilian municipalities have stormwater systems, only 55% are connected to a wastewater system. To help improve the current situation, this study estimates the costs for implementing an intermediate solution, which is designed to ease the transition towards a separate wastewater treatment system. This solution utilizes a combined sewer system approach in areas where stormwater systems have already been implemented. A case study was carried out assessing two possible alternatives for a wastewater treatment system with data from the city of Joinville. Both alternatives are separate systems but one has a combined system as an intermediate solution. The results show that the alternative with an intermediate combined system will reduce the short‐term financial burden on governments in comparison to the separate sewer system approach.

show abstract

“…Because of the delayed degradation of organic waste in psychrophilic AD, it is suggested that the system should operate with a lower OLR and maintain a higher HRT than that of mesophilic AD. The OLR also has a significant effect on the performance of anaerobic digesters, and optimizing the HRT and OLR can lead to a more stable and efficient system with increased biogas production, even in psychrophilic AD [67]. A study found that at a low temperature of 10 • C and HRT of 20 d, there was an imbalance in the production of VFAs, with the concentration of propionate being almost three times that of acetate.…”

Section: Increasing Hrt and Lowering Olrmentioning

confidence: 99%

Household biogas technology in the cold climate of low-income countries: a review of sustainable technologies for accelerating biogas generation

Lohani,

Shaw,

Shrestha

et al. 2024

Prog. Energy

View full text Add to dashboard Cite

Low-income countries have long benefited from household biogas plants for extracting clean energy and fertilizer. Despite the popularity, such ordinary plants do not have heating systems and suffer lower biogas production in cold regions or cold winters. This paper attempts a comprehensive review on research and development of household biogas technology in cold climate. This review specifically highlights the influence of temperature on biogas production, and technologies and recent advances in psychrophilic biogas production. Such measures are introduction of adapted inoculums, maneuvering operational parameters like hydraulic retention time (HRT) and organic loading rate (OLR), co-digestion approach and additives and digester designs. In addition to that, the review portrays adoption of low-cost heating arrangements including construction of greenhouse over bio-digesters, digester insulation, and integration of solar heating is crucial to enhance biogas production. Furthermore, this review identified gaps in the operation of bio-digesters under psychrophilic temperature in low-income countries and recommends operational consistencies in full scale psychrophilic biogas plants through development of standards, operational guidelines, and users' trainings.

show abstract

A septic tank‐UASB combined system for domestic wastewater treatment: a pilot test

Cited by 9 publications

References 18 publications

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Case study on the use of a combined system as an intermediate solution in Brazil: cost estimate

Household biogas technology in the cold climate of low-income countries: a review of sustainable technologies for accelerating biogas generation

Contact Info

Product

Resources

About