In the treatment of various types of wastewater, especially sanitary wastewater, septic tank is widely used. A septic tank is a pre-treatment unit that reduces wastewater pollution by 25-30%. Physical and biological processes are the main processes that treat wastewater in a septic tank. These processes mainly include sedimentation, flotation and biological anaerobic processes, each of which reduces part of the pollution load. Septic tank is one of the first methods among the various methods of wastewater treatment that has the ability to reduce wastewater pollution by more than 50% And in many cases, due to environmental conditions, can be used in a suitable and cost-effective way in projects. In terms of construction, it can be said that a polyethylene septic tank is a tank with at least one wall divided into two The section is unequally divided. In the first part, in the polyethylene septic tank, large materials and particles are deposited and accumulated in the bottom of the polyethylene tank. Floating fats and oils also accumulate on the surface of the liquid inside the polyethylene tank. Microorganisms in the wastewater under anaerobic conditions decompose some of the contaminants and reduce the load of sewage pollution inside the septic tank. The embedded wall between the first and second zones of the polyethylene septic tank prevents the passage of sediment and the floating fats of the first zone to the second zone. This, the clarified effluent inside the polyethylene septic tank is transferred to the second part and Finally, the septic tank effluent is discharged through an outlet pipe of the anaerobic septic tank. The effluent usually enters the absorption well. The septic tank is also used for pre-treatment, wastewater anaerobic treatment, balancing or sewage pumping station. Important components of each septic tank are:
N1. Sewage inlet system: includes inlet pipe and baffle (intermediate). 2 .Septic tank primary tank: which has the largest volume of septic tank and usually 70-60% of the total volume of septic tank belongs to this section. 3.Department wall: which prevents the entry of sludge, grease and floating oils into the clarification tank. 4.Clarification tank: This tank contains approximately 30% of the total volume of the septic tank and is free of wastewater. Accumulates sediment and buoyancy. 5. Biogas outlet (ventilation): Through these ducts produced by anaerobic wastewater treatment processes, which is mainly complete, the aseptic tank is removed. 6. Sewage outlet system: including baffle and The outlet pipe is a septic tank.
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