This is an abbreviation of Decentralized Wastewater Treatment System and has been assigned to a typical system of sewage treatment and resource utilization for greening in isolated habitations. The generalized treatment sequence is shown in Figure
This system is addressed to isolated habitations where there is a need for non- mechanized and self-operating treatment technology given the premise that adequate land area is available and at reasonable distance from the habitation itself. Another aspect will be to group the toilets or at least bring the sewage from the various centres to the Dewats facility.
The typical treatment units are:
a) Pre-treatment settler: retention time of about 2 hours; BOD reduction by about
30%
b) Anaerobic Baffled Tank Reactor: retention time of about 24 hours; BOD reduction
by about 80%
c) Anaerobic filter: retention time of about 8 hours; BOD reduction by about 90%
d) Planted gravel filter: retention time of about 36 hours; BOD reduction by about
90%
e) Polishing pond.
These have been installed and commissioned in quite a few habitations in India and a
compilation of the facility at the recent earthquake ravaged place of Bhuj in Gujarat is shown in Figure
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