Wastewater Treatment

Wastewater treatment is processes of removal of waste through water make it suitable for human usages. This process includes removal of chemical, physical, and biological contaminants from water by chemical, physical, and biological process. The objective of wastewater treatment is to make it suitable for human usage.

Whole of the process includes three steps

Primary Treatment: It includes settlement of solid 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.