TEW Waste Water 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.
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.
| 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 |