Chemical Wastewater

Chemical wastewater is that polluted water which contains chemical wastes exerted by factories. It includes hazardous chemicals which makes water unsuitable for human uses. It will cause damage when in contact with humans being. Chemical residue may be present in solid, liquid or in gas form in water. Chemical waste can be removed by wastewater treatment process.

Primary Treatment: It includes settlement of solid chemical or other particles in water. It is used to reduce sand, fats, oils, and other settle able solids. It is a mechanical process which includes influx and removal of objects, sand and grit removal, screening, maceration, and sedimentation. Water is allowed to stand for a long time to settle these foreign particles.

Secondary Treatment: It includes biological treatment to supernatant and settled solids. It includes roughing filters, activated sludge, filter beds, rotating plates and spirals, and secondary sedimentation. It is helpful in degrading of biological content of the waste. In activated sludge oxygen is dissolved to make biological floc and then removes organic material.

Tertiary treatment: It includes lagooning, micro-filtration or disinfection. It includes filtration, lagooning, constructed wetlands, nutrient removal, disinfection etc. it is the final stage to raise the quality of wastewater to meet the standards of drinking water. Disinfection process is done to reduce the number of bacteria and other organisms.