Abstract
To mitigate water shortage and pollution, decentralized reclamation and reuse of domestic greywater in peri-urban areas of Bangkok, Thailand was proposed. The treatability of greywater using a biofilm process was discussed using laboratory scale experiments with and without aeration and different HRT. The removal of anion surfactants (MBAS) as well as linear alkyl benzene sulfonate (LAS) was greater than 90% in the oxic experiments, even with an HRT of 1 day. The removal rates were much lower during the anoxic experiments. The MBAS removal by the sludge accumulation, estimated by measuring the sludge production rate, was trivial. Therefore, it was suggested that the removal of MBAS was primarily a result of biological degradation. A decrease in phosphorus addition in detergent is recommended because the poly－P in detergents can be hydrolyzed during the treatment process and would cause eutrophication. The contact aeration process appeared to be applicable to greywater reclamation and reuse in the peri-urban area of Bangkok.
