Course TEN-702 Industrial waste management unit-1 • Lecture -6 & 7 Indian standards for disposal of treated wastewater • Governing bodies 1. BIS • Provide guide lines to the central (CPCB) and state (SPCB) governments for selecting appropriate technology, suitable site and the degree of treatment Governing bodies 2. Central board for prevention and control of water pollution – A committee has been formed to study the problems of pollution in the industry and suggest to the central board • Suitable effluent standards for industry and • Guidelines to take effective pollution control measures Indian standards for disposal of treated wastewater • Important terms • Limits set for a pollutant taken up by an organism or a population. • Acceptable daily intake of toxic substance • Maximum permissible index Important terms……. • Limits set for a pollutant present in a specific environment, medium or product (food and consumer product) –Desired working levels –Product standards Important terms…. • Limit set for discharges or emissions from polluting sources –Permissible discharge limit –such as BOD5 at 200 C, max = 30 mg/l –Oil and grease, max = 10 mg/l Modes of disposal • Disposal on land • Disposal into public sewer • Disposal into inland surface water Disposal on land • Merits when designed effluent – Economic crop irrigation – Soil filtration • Demerits when nutrient rich effluent – Deleterious effects on crop growth – Decreased soil permeability – Sewage sickness – Ground water contamination Disposal on land Disposal into public sewer • Problems associated with – Choke or damage the sewer – Corrosion – Hamper the biological activity when toxic or acidic/basic – Explosion when inflammable – Health hazard for sewage workers – reduce hydraulic capacity when oil, grease, ash etc….. Disposal into public sewer Disposal into inland surface water • Problem associated with – Degrade the water quality – Affect the aquaculture – And many more…….. EFFLUENT DISCHARGE INTO WATER BODIES Questions? Home assignment-4 • Identify the sites of industrial discharge on land, in public sewers and in water bodies. Discuss the persisting problems of the same. Thanks!