On-line version ISSN 0378-4738
TEWARI, PK; SINGH, RK; BATRA, VS and BALAKRISHNAN, M. Field testing of polymeric mesh and ash-based ceramic membranes in a membrane bioreactor (MBR) for decentralised sewage treatment. Water SA [online]. 2012, vol.38, n.5, pp. 727-730. ISSN 0378-4738.
This paper presents the initial findings of field testing of 2 low-cost membrane filters, viz. 30 μm polymeric mesh and 2-6 μηι macroporous waste-ash based ceramic filter, in a submerged membrane bioreactor (MBR) employing batch anoxic and aerobic conditions. The influent was raw wastewater from a residential complex located near Delhi, India. The results indicated that the ceramic filter was able to operate for longer periods without cleaning; however, there is a limit to the transmembrane pressure it can withstand. The suspended solids retention was high with both filters (average of 96%). Moderate reduction in chemical oxygen demand (COD), total nitrogen (NH,+) and total phosphorus (PO,3) was achieved. The improvements in operation required in such systems are also underlined.
Keywords : membrane separation; activated sludge, sewage treatment; polymeric mesh; fly ash ceramic membrane.