Baffled septic tank with anaerobic filter (BASTAF) and vertical subsurface flow costructed wetland for domestic wastewater treatment in Vietnam.
2010 (English)In: Water Practice & Technology, ISSN 1751-231X, Vol. 5, no 4Article in journal (Refereed) Published
The decentralized wastewater management utilizing existing infrastructure and low-cost natural treatment processes has a large potential in Vietnam. Centralized wastewater collection and treatment systems are often not affordable. Currently the septic tank is the most common on-site wastewater treatment facility in Vietnam. Nevertheless it has a limited treatment performance. The Improved Septic Tank, also known as Baffled Septic Tank with or without Anaerobic Filter (BASTAF or BAST) represents a valuable and promising alternative to the conventional septic tank. Results of laboratory- and pilot-scale research on BAST and BASTAF systems show that at a hydraulic retention time (HRT) of 2 days the 3-chamber BAST followed by Anaerobic Filter significantly increased the removal efficiencies in terms of BOD, COD and TSS in comparison with a conventional septic tank of the same size. Average treatment efficiencies of 80–90% in terms of BOD, COD and TSS can be achieved. Another component of the study showed that post-treatment of BASTAF effluent in a 2-stage vertical flow constructed wetland (CW) planted with locally available macrophytes allowed the achievement of level A, Vietnamese standard for wastewater discharge in terms of COD, BOD5, TSS, TN, NH4-N and T-P. Results of this study are now being implemented in different provinces inVietnam.
Place, publisher, year, edition, pages
IWA Publishing , 2010. Vol. 5, no 4
Anaerobic filter; baffled septic tank; constructed wetland; Vietnam; wastewater
IdentifiersURN: urn:nbn:se:liu:diva-64431DOI: 10.2166/wpt.2010.100OAI: oai:DiVA.org:liu-64431DiVA: diva2:391049