Anaerobic Baffled Reactor – June 2019

Anaerobic Baffled Reactor – June 2019
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Location of the case study

Bangladesh - Cox's Bazaar - Kutupalong Camp


Main treatment objectives

BOD/COD reduction, Nutrient reduction, Pathogen reduction, Solid/liquid separation, TSS and TDS reduction

Capex per design input flow

324 USD/m3/day

Opex per real input flow


Required space


Description of the treatment process

The ABR is at the top of the hill and is operated through gravitational force. It consists of settler- thickening tank and 4 baffled reactors.

Besides, there is a provision of planted filtration unit using different sizes gravel and sand. The separated liquid part (leachate) of raw FS pre-treated on drying beds further undergone with phytoremediation filtration chamber and followed by a polishing pond. The effluent discharged into the environment within the Bangladesh effluent discharge standards. Canna indica is the perennial plant used in the filtration unit to aid further leachate treatment.

Inside the settler tank, the solid settles down in the ABR and the liquid overflows through a PVC pipe. The liquid goes to the filtration system and after filtering that water, effluent water comes out of the filtration unit and finally in the polishing pond. There is a drying bed for drying purpose of separated solids. These consist of different layers of gravel-sand filter media of different thickness and gavel size. The benefits of these beds include no requirement and use of power. The drying process is enhanced by evaporation and solid-liquid separation by gravity percolation of leachate. There is a scope to use dried sludge as soil conditioner.

Description of the emergency context

Living area of community (name and localization of camp/city/village, access): Kutupalong Camp Area in different locations

Local and international WaSH institutions (management committees, NGOs, WaSH governmental agencies, private sector) with WaSH active role in the community and specific partnerships: NGO Forum and other development organization such as BRAC, ACF, PCCR, IFRC, Friendship etc.

Main waterborne diseases: Cholera, Diarrhea, Dysentery, Typhoid etc.



Lessons learned

If we construct small sewerage borehole and increase secondary transfer station, safety tank then the cost will be reduced.

By constructing small sewerage borehole or transfer station, we can reduce contacts between staff and sludge.

Ensuring community engagement and engaging skilled volunteer’s can guarantee the sustainability of the plant.

Specific challenges:

• emptying frequency too high as a result it is difficult to maintain retention periods.
• leakage of convenes pipe
• quality of effluent water
• space in the camps is limited due to the number of people and topography
• landslides in the rainy season

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