Sewage Water Treatment Plant Manufacturer
Sewage Treatment Plant processes include primary, secondary, or biological, and tertiary treatment processes to improve the quality of wastewater for recycling.
Waste water is generated as infrastructure develops and water is used for various reasons such as home and commercial.
Sewage Treatment Plant Process
Sewage can be treated by designing a three-stage sewage treatment plant (STP): primary/preliminary, secondary, and tertiary.
Primary Treatment- Sewage water is first permitted to travel through screens or grit chambers in a sewage treatment facility, where big solids are removed. This is followed by tank aeration/mixing and primary sedimentation, in which suspended solids settle. The addition of a coagulant is used in primary treatment to remove grits, coarse particles, oil, and grease, if present. Preliminary treatment results in solids (sludge) sedimentation and the creation of an effluent that floats above the sludge. Primary treatment effluent contains 45-50% unstable organic materials. The wastewater is subsequently subjected to secondary treatment, in which fine particulates settle out due to bacterial activity.
Secondary or Biological Treatment- Through biological processes, this stage transforms organic waste in sewage into stable forms, resulting in secondary sedimentation. Trickling filters and the activated sludge technique are two common approaches.
Trickling filters are made up of an enclosed tank with a brick bed and a layer of microorganisms. The effluent enters the tank through an inlet and is sprinkled over the bed layer. Microbial activities oxidise the organic matter in the effluent, resulting in the removal of fine fines, the production of sludge, and a lower organic solids content in the effluent.
The activated sludge process involves adding an active microbe mixture to sewage, followed by aeration and agitation. Aerobic conditions and microbial activity oxidise organic materials, causing coagulation, flocculation, and solid settling. Activated sludge yields a clear liquid with no odour.
Tertiary Treatment –The wastewater is subsequently subjected to tertiary treatment/disinfection via the use of UV radiation or chlorination. Depending on the nature of the sewage and the effluent from secondary treatment, other technologies such as sand filters and reverse osmosis may be employed instead at this step of treatment.