Cost-effective treatment solutions for rural areas: design and operation of a new package treatment plant for single households

Author:

Daude D.1,Stephenson T.2

Affiliation:

1. Conder Products Ltd., Sewage Technology Division, Kingsley House, Ganders Park, Kingsley, Hampshire, GU35 9LU, UK (E-mail: ddaude@cstl.co.uk)

2. School of Water Sciences, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK (E-mail: t.stephenson@cranfield.ac.uk)

Abstract

The design approach and operation of a newly developed package plant treating domestic sewage from single households were evaluated. Combining submerged aerated filter (SAF) technology with jet aeration and incorporating both into a compact and shallow tank resulted in a cost-effective treatment solution. A trial unit was permanently installed at a rural site, serving a single household. Jet aeration proved to be the best aeration method for the shallow bioreactor design. Further trials revealed a 50% reduction in suspended solids (SS) through the use of a static effluent filter and found that annual plant maintenance was vital to sustain stable operating conditions. Despite high variations in influent conditions, the trial unit produced good effluent quality during steady-state operation. Average effluent BOD5, COD and SS values were 19.6 mg l-1, 98 mg l-1 and 32 mg l-1 achieving overall removal efficiencies of 94.2%, 85.9% and 87.6% respectively. However, effluent ammonia nitrogen (NH4-N) levels were found to be inconsistent varying from 9 mg l-1 to over 60 mg l-1.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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