What is the process of wastewater treatment plant?

Primary Treatment:

Primary industrial wastewater treatment plant uses screens, grit chamber, and sedimentation tank to get quality water which is free from waste and bad bacteria. Before ejection of the quality water, the sewage passes through many cleaning processes. When sewage influent in the plant for treatment, it come across to a screen for removal of large floating objects that can block or damage pipes or equipment.

After completion of the primary screening process, water falls into a grit chamber where small objects are separated from the water. It set cinders, sand, and stones at the bottom.

After above two applications for removal of big and small objects, sewage water contains many suspended solids with the organic and inorganic materials. For water purification, minute particles are needed to be yet removed. Sedimentation tank is used for this process. In this tank, solids sink to the bottom as and when the flow of water gets reduced. This collection of solid is known as raw primary bio solids formerly sludge that is thrown out of the tank through pumping.

Gradually, this primary method was unable to meet the increased quality demands of the community. So, the secondary and advanced methods are developed to fulfill the needs of cities and industries.

Secondary Treatment:

By using the trickling filter and activated sludge process, this stage throws out around 85% of the organic and inorganic waste material from the water.

After completion of the primary stage and when effluent leaves sedimentation tank, trickling filter comes into play. The trickling filter is around six feet deep bed of stones through which sewage flows. Partially treated sewage gets transmitted to another sedimentation tank after trickling filter to remove bacteria.

Nowadays, activated sludge process is used in place of trickling filter. The process is fast and early result giving compared to the tricking filter. After primary stage sedimentation tank, sewage flows into aeration tank. For few hours, it is blended with air and sludge loaded with bacteria to break down the organic matters. Like tricking filter, partially treated sewage sent to another sedimentation tank for further process.

At the end of the stage, the effluent of sedimentation tank is disinfected with the help of chlorine to remove odour and kill pathogenic bacteria before being discharged to water communities.

Other Plans:

Increasing pollution problems is putting additional weight on Industrial wastewater treatment plants and Sewage treatment plants and system. The number of the toxic substances, heavy metal, chemicalsin water has increased dramatically. Advanced waste treatment technique and better wastewater system that separates chemicals, absorb carbons and filter the water are used to get the purified water.