Wastewater treatment equipment for slaughterhouses in Dongfang City

Wastewater treatment equipment for slaughterhouses in Dongfang CityIt is achieved by aerobic non motile bacteria being in a suppressed state under anaerobic conditions, using polyphosphate in the bacterial body as energy to absorb organic matter into cells for conversion and storage. At the same time, the polyphosphate in the body is decomposed into soluble phosphate and discharged from the body. After anaerobic suppression, the non motile bacteria have strong phosphate absorption ability under aerobic conditions, absorbing and converting phosphate in domestic sewage into polyphosphate for storage in the body. The more phosphorus is released under anaerobic conditions, the more it is absorbed under aerobic conditions, and the use of excess sludge to remove phosphorus from domestic sewage is achieved.

Working Principle:

Due to the presence of a certain amount of large floating debris (blood stains, fur, impurities, etc.) in the slaughter wastewater, a grid is first used to intercept it to ensure the normal operation of subsequent equipment. This is because the slaughter wastewater contains large organic molecules such as blood stains and oils, which are difficult to degrade when directly introduced into the aerobic system. Therefore, the effluent from the grid enters the septic tank. The existing septic tank in the slaughterhouse can achieve certain treatment effects, but the current effluent concentration is still high and carries some oil. In order to reduce the load on subsequent treatment facilities, it is considered to add an oil separation tank at the front end to remove oil. Due to working hours, the drainage cycle of slaughterhouses is different from other sewage discharge cycles. It mainly discharges at night, so a large regulating pool must be set up to regulate the water quality and quantity to ensure the normal operation of the entire facility and reduce the impact on the downstream

Wastewater treatment equipment for slaughterhouses in Dongfang City

The impact load brought by the facilities is continued, and the sewage is collected by the regulating tank and then pumped into the subsequent treatment facilities through pumps. After being treated by the front-end septic tank, the sewage still contains most of the large molecular organic pollutants, so it needs to be further degraded into small molecular substances to prepare for subsequent aerobic biochemistry. Considering the excessive levels of ammonia nitrogen and total phosphorus in the sewage, it is necessary to establish an aerobic anoxic alternating operation environment to achieve the effect of nitrification denitrification and phosphorus removal. Here, a hydrolysis acidification tank is set up to reflux the effluent from subsequent aerobic treatment to the hydrolysis acidification tank. After passing through the hydrolysis and acidification tank, the sewage enters the aerobic tank, which is divided into two sections. Its advantage is that in different aerobic sections, microorganisms present spatial distribution according to the environment, which is targeted and has better removal effect. After being treated by various biochemical treatment facilities in the front-end, the organic pollution load is greatly degraded. However, the chromaticity in the sewage is still difficult to meet the standard. In order to remove chromaticity and consider the reduction of COD, ammonia nitrogen, and total phosphorus, a coagulation sedimentation tank is set up here and targeted chemicals are added. The effluent from the sedimentation tank enters the disinfection tank, and then meets the discharge standards.

Process flow:

The sewage from the sewage treatment system enters the regulating tank through the grid and then enters the bioreactor through the lifting pump. The aerator is activated by the PLC controller for oxygenation, and the effluent from the bioreactor enters the membrane separation treatment unit through the circulation pump,

The concentrated water returns to the regulating tank, and the water separated by the membrane undergoes rapid mixing chlorination disinfection (sodium hypochlorite, chlorine tablets) before entering the reclaimed water storage tank. The backwash pump uses the treated water in the cleaning tank to backwash the membrane treatment equipment, and the backwash wastewater returns to the regulating tank. Control the opening and closing of the lift pump by regulating the water level inside the bioreactor. The filtration and backwashing operations of the membrane unit can be controlled automatically or manually. When the membrane unit requires chemical cleaning operation, close the inlet valve and sewage circulation valve, open the chemical cleaning valve and chemical circulation valve, start the chemical circulation pump, and perform chemical cleaning operation.