Industrial Waste Water Treatments
- Sewage/Black water treatment plants
- Effluent treatment plants
- Grey water treatment plants
in both as packaged unit and as projects. Industrial wastewater treatment is used to treat wastewater that is produced as a by-product of industries. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment. Primary treatment for the purposes of this manual will be limited to sedimentation with and without chemical addition. Other unit processes are usually combined with sedimentation as a part of “primary treatment”, including some degree of preliminary treatment, sludge treatment and disposal, and chlorination as disinfection
Physical Unit Operation: Treatment methods includes Screening, mixing, flocculation, sedimentation, flotation, and filtration.
Chemical Unit Operation: Treatment methods in which removal or conversion of contaminants is brought about by the addition of chemical or by other chemical reactions. Disinfection, pH adjustment, neutralization, oxidation / reduction is most commonly used in waste water treatment
Physio-Chemical Treatment: DAF (Dissolved Air Flotation) – air is intimately contacted with an aqueous stream at high pressure, dissolving the air. The pressure of the liquid is reduced through a back-pressure valve, therefore releasing micron sized bubbles that sweeps suspended solids and oil from the polluted stream to the surface of the air flotation unit. Solids having a greater gravity than water tend to settle at the bottom and are removed by rotating scrapper arms
Biological treatment processes are those that use microorganisms to coagulate and remove the non-settleable colloidal solids and to stabilize the organic matter. Biological processes are classified by the oxygen dependence of the primary microorganism responsible for waste treatment.