Anaerobic Baffled Reactor – maturation ponds – December 2019

Anaerobic Baffled Reactor – maturation ponds – December 2019
  • Organization : Save the Children International

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Location of the case study

Myanmar - Rakhine State - Pauktaw Township - Sin Tet Maw IDP camp

 

Main treatment objectives

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

Opex per real input flow

4.2USD/m3

Required space

0.68, m2/personm2/person

Description of the treatment process

• A first physical treatment by filtering through a grid the object present,
• A second physical treatment in a sludge drying bed: a settlement tank to separate the sludge into a solid part and a liquid part, which is clearly the first module in terms of construction.
• A third physical treatment: a settler to polish the sedimentation,
• A first biological treatment: an Anaerobic Baffled Reactor (ABR) to degrade the suspended and dissolved solids,
• A second biological treatment: two aerobic maturation pond to remove pathogens, on which is added a polishing pond.

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Description of the emergency context

Pauktaw is a zone that was directly affected by the October 2012 ethnic conflict. IDPs, Host Communities and isolated villages are facing an immediate need for water, sanitation and hygiene education as well as access to health and nutrition services. This is especially important given the crowded conditions in most of these neighborhoods.

Sin Thet Maw camp, in Pauktaw is supported for the WASH activities by Save the Children. In term of sanitation, around 430 latrines have been built for this camp hosting 682 households and 2523 beneficiaries.
The waterproof aspect of the latrine pits implies a filling of the latrines pits. Once the pit full, create another pit and latrine is not possible for a reason of land availability. Like for the Sittwe camps, desludging of the latrines and treatment of the sludge have been considered.

Community
• Dimensions or area: 800,000 square feet (7.5 hectares)
• Livelihood: mainly fishery
• Type of shelter/house: long house shelter
• HHs dimensions: average of 3.7 individuals per household
• Living area of community: Sin Thet Maw IDP camp, 20° 4’4.33″N, 92°59’33.56″E, 35min boat trip from Sittwe Golden River Jetty)
• Population increase/decrease forecast: 6-10% annual growth
• Type of site: semi-permanent camp
• Type of context: rural
• Other WaSH activities implemented in the community: hygiene promotion, water treatment and distribution, drainage, solid waste management.
• Local and international WaSH institutions with WaSH active role in the community and specific partnerships: only Save The Children is the WASH service provider
• Main waterborne diseases: AWD

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Indicators

Narrative

Lessons learned

Were you able to reduce the inlet quantity of sludge of the plant? How? Not needed

Were the design hypotheses correct? Yes

Have the design rules given the expected results? Yes

How have you reduced contact between staff and sludge? Safety equipment

What good practices would you recommend? A design with sufficient treatment capacity

Construction period not during water scarcity period and neither during monsoon.

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