The aim of this stretch filter treatment technque is simply the removal of large particles and fibers to protect the subsequent infiltration pipes from clogging and transferring it as soon as possible for treatment into a biologically active,
aerobic soil-zone environment where both macro- and microorganisms can thrive. Stretch-filters are made to retain fibers and large particles and allow the rest of the organic material to travel on to the next stage of processing. This filter is suitable for public facilities where the principal source of greywater is hand-washing and showers without any food waste to speak of. If this type of filter is used to remove food wastes,
these will accumulate in the filter which then becomes anaerobic and makes the effluent malodorous.The result is often that too frequent changes of the stretch-filter becomes necessary ---thus creating an undesirable,high-maintenance situation. See diagram below for a typical Clivus greywater management fabric filter configuration.
Greywater is commonly defined as wastewater generated from bathroom, laundry and
kitchen. Due to rapid industrialization and development, there is an increased opportunity for
greywater reuse in developing countries such as India. This Manual provides theory and
practices for greywater reuse in residential complexes with particular emphasis on schools.
Greywater treatment process varies from simple devices that divert greywater for direct
application such as irrigation to complex systems involving sedimentation tanks, filters,
bioreactors, pumps and disinfection systems. However, the basic objective of this manual is to
initiate process of Greywater treatment in India and keeping cost-effectiveness as a basis theme.
Simple treatment systems for non-contact use are also described. This manual provides
acceptable solutions for reuse of greywater in unsewered areas that satisfies the performance
objective and requirements. It may be appropriate for persons contemplating a greywater
reuse system to consult a wastewater system designer or other suitably qualified person to
consider the options available.
These practitioners include the engineers, water quality analysts, scientists,
sociologists and the professionals involved in monitoring and control of water safety
in water supplies. The manual is designed to provide guidance to the practitioners
on how to design, build and use a greywater system. It is written exclusively to enable
the water suppliers to develop the greywater reuse system without having to depend on
the external input.