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!