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TEW WasteWater Treatment
 
TEW  Water Treatment Process
involves removal or recovery of waste water constituents harmful to any specific point of disposal and to environment in general.involves removal or recovery of waste water constituents harmful to any specific point of disposal and to environment in general
Domestic,community and many sorts of industrial waste water are treated by biological purification process, whereas many other industrial wastes have to be purified by physical/chemical treatment methods
For biological treatment process, there are at least eight typical models, plus some conventional modifications for these models

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Waste Water Quality

Waste water constituents are typi-cally classified under:

Coarse and fine particles - sand - oil/fat - suspended solids, which mostly are settleable - BOD, COD-nitrogen and phosphorous contents - microorganisms - specific parameters, like pH, heavy metals, CN etc

 

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Source

Characteristics

Treatment

Food Industries

 

 

Breweries

high nitrogen and carbohydrates

biological treatment, recovery, animalfeed

Canneries

high solids and BOD

screens, lagoons, irrigation

Dairies

high fat, protein, and carbohydrate

biological treatment

Fish

high BOD, odour

evaporation, burial, animal feed

Meat processing

high protein and fat (may be warm)

screens, Sedimentation, flotation, biological treatment

Pickles

high BOD, high or low pH. high solids

screening, flow equalisation, biologicaltreatment

Soft drinks

high BOD and solids

screening, biological treatment

Sugar

high carbohydrate

lagoons, biological treatment

 

Chemical Industries

   

Acids

low pH, low organics

neutralisation

Detergents

high BOD and phosphate

flotation, precipitation

Explosives

high organics and nitrogen. trinitrotoluene

chlorination or TNT precipitation

Insecticides

high organics, toxic to biological Systems

dilution, adsorption, chlorination at high pH

 

Material industries

   

Foundries

high solids (sand. clay, and coal)

screens, drying

Oil

dissolved solids, high BOD. odour. phenols

injection, recovery of oils

Paper

variable pH, high solids

Sedimentation, biological treatment

Plating

acid, heavy metals, cyanide toxic to biological Systems

neutralisation,

Rubber

high BOD and solids. odour

biological treatment

Steel

low pH, phenols, high suspended solids

neutralisation, coagulation

Textiles

high pH, and BOD, high solids

neutralisation, precipitation, biological treatment

 
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