Kitchen waste wastewater, commonly known as swill, is a high concentration organic wastewater, and its water quality varies greatly depending on the type, scale, and season of the waste. Based on our company's past experience analysis, the general inlet water quality isBODandCODMore than usual0.3～0.6Due to its good biodegradability, biological treatment technology is adopted for the treatment of this type of wastewater. Regarding the presence of oil in wastewater,SSDue to its high concentration, oil separation tanks and air flotation are used to remove oil and other pollutants from wastewaterSSUse it as a pre-treatment before sewage biochemical treatment. The biochemical part adoptsMBRProcessing technology, setting up nitrification and denitrification treatment facilities, can effectively removeCODAnd ammonia nitrogen.

The treatment of kitchen waste and wastewater adoptsMBRDue to its high sludge concentration, the capacity of the treatment structure is greatly reduced, the engineering investment is low, the treatment effect is stable, and the cost-effectiveness is high.

comprehensive regulating tankKitchen waste wastewater contains a large amount of suspended solids and oils. To ensure the normal operation of subsequent treatment processes, it is necessary to filter out the oils and suspended solids in the wastewater. Therefore, wastewater entersMBRBefore processing the system, it first enters the cyclone oil remover, and then enters the air flotation tank to remove oil and large particulate matter from the sewage.

air flotation tankDuring the rising process of sewage, microbubbles generated by the inflation section are fully mixed. Due to the density imbalance between the air-water mixture and the liquid, a vertical upward buoyancy is generated, which willSSBring it to the surface of the water. During the process of buoyancy, microbubbles will adhere toSSUp, after reaching the surface of the waterSSRelying on these bubbles to support and maintain on the water surface. Floating on the surface of the waterSSIntermittent cleaning by chain scraper.

Biochemical system：MBRThe system adopts internal (external) ultrafiltration membrane components and online cleaning system. Pre treated wastewater entersMBRBiochemical processing system.MBRThe biochemical reactor consists of a pre denitrification tank and a nitrification tank, both of which are two-stage denitrification and nitrification processes. In the nitrification tank, most of the organic matter is degraded by highly active aerobic microorganisms, and ammonia nitrogen and organic nitrogen are oxidized into nitrate and nitrite, which are then returned to the denitrification tank and reduced to nitrogen gas in an anaerobic environment for discharge, achieving the purpose of denitrification. To improve the utilization rate of oxygen, an efficient internal circulation jet aeration system is adopted, and the oxygen utilization rate can reach35%Sludge reflux can increase the sludge concentration in the biochemical reactor to15g/LThe microbial community formed through continuous domestication can gradually degrade organic matter that is difficult to biodegrade in wastewater. The pre denitrification reactor maximizes the utilization of carbohydrates present in the wastewater. The removal rate of ammonia nitrogen in nitrification denitrification tank can reach90%Above, the pollutant removal load is high, and the sludge concentration can reach15g/L.