In CSIR Networked Programme (SMM-05) one of the component is estimation of assimilative capacity of environmental media (air, water, land and biological), which has to be dealt by NEERI in three regions viz. Central India – Nagpur (M.S.) and Chhindwara (M.P.) districts, Coastal region - Visakhapatnam district (A.P.) and Hilly region - Mandi and Bilaspur districts (H.P.). The aims of the study are to develop the methodology for estimation of assimilative capacity with respect to various pollutants under different management options and development scenario; and delineation of assimilative capacity based standards for water sources for sustainable development.
A meso-scale database on assimilative capacity of environmental media (air, water, land and biological) is essential for understanding the status of environment and for developing environmental quality standards, which will help easy and transparent decision making at policy, plan and project levels. A database for three representative regions would be generated, which would be available in public domain.
Water quality analyses of major water resources of the two regions viz. Central India and Coastal region were carried out during post-monsoon as well as critical seasons. The analytical results showed that majority of water resources fall within the permissible limits of drinking water standards except coliform bacterial counts. It is observed that the water resources are suitable for irrigation purpose with few exceptions.
Spatial variation in surface and groundwater quality was observed depending upon geological strata, pollution load by point and non-point sources and local ongoing practices in catchment area. The problem is aggravated in critical season, as pollution and chemical ingredients get concentrated in small amount of water resources. This calls for proper
catchment area treatment strategies for surface water resources and conservation and protection of groundwater resources from being polluted. Using these resources for drinking purpose require proper water treatment with disinfection, whereas for irrigation purpose it requires adoption of proper irrigation methods and scheduling of irrigation in order to prevent water logging and salinity problems of land resources.
Pollutants assimilative capacity of soils varies depending upon their intrinsic properties. One of the components in this project is Lysimetric study for Soil - Wastewater interaction. These studies will help in determining horizon wise pollutant retention capacity of soil, which will entail about quantum of groundwater pollution at wastewater application sites vis-à-vis soil pollution.
Water sampling (Surface and ground water) and onsite analysis
Soil Profile Studies
Lysimetric Studies for Soil - Wastewater Interaction