Technology plays a vital role in Liquid Waste Management. Besides, the type of waste water(black, grey or combined wastewater), other factor such as space, soil and water table influence the technology selection Hence, it is important that due attention to those factors that are relevant to the situation.
Criteria for selection of technology
There is a misconception that the village population size should govern the technology selection with larger villages should adopt centralized waste water management and decentralized technologies like soak pit, kitchen garden are meant for smaller villages. This is not correct. Rather than classifying villages/GPs on population norms, the following criteria should be used for selection of technology for Liquid Waste Management.
- Availability of space near houses and housing pattern
- Geophysical condition of the village including topography, soil structure and ground water conditions
- Sources of water and pattern of water supply (individual/public)
- Availability of open spaces in and around the village
- Economic status of the GP and human resources available with GP
- Location of water table
- Geographical location of GP (Peri urban /Rural / Flood prone areas near river bed /Water scarcity areas )
(A) Technologies for Grey Water Management
An Overview of Technologies for Grey Water Management
Managment at community level
Phytorid Techonolgy developed by NEERI
Seechewal Model -WSP coupled with pre treatment
Intergartion with Urban area sewer system for PERI urban areas as PERI urban areas normally lack space for installation of Sewerage treatmnet plant or WSP
Selection of right technology
Instead of adopting a single technology for the entire region a multiple technology approach is essential. Even within a village there can be multiple options for individual households or for a group of houses.
While planning for a particular GP, follow the following algorithms & select appropriate technology.
(A) For General Area
(B) For Areas with seasonal high water table (only in rainy season)
For these areas also follow the above algorithm.
(C) For Areas with permanent high water table / Water logged areas
(D) For Areas with hard strata (rocky strata)