Kitchen waste and wastewater treatment

NegotiableUpdate on 11/07

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Overview

Kitchen waste wastewater treatment is a high concentration organic wastewater, and its water quality varies greatly depending on the type, scale, and season of the waste

Product Details

Kitchen waste and wastewater treatment

Kitchen waste wastewater is a high concentration organic wastewater, and its water quality varies greatly depending on the type, scale, and season of the waste. According to the water quality analysis of similar projects, the BOD/COD ratio is generally between 0.3 and 0.6, indicating good biodegradability. The use of biological treatment technology effectively treats a large amount of COD and SS in wastewater. Based on the characteristics of wastewater containing oil and high SS concentration, cyclone oil remover and air flotation are used to remove oil and SS from wastewater as pretreatment before biochemical treatment. Due to the high concentration of COD and ammonia nitrogen in the treatment of kitchen waste wastewater, there are many difficult to decompose organic compounds in the wastewater when using biological treatment technology. After pretreatment and biological treatment, the COD value of the effluent generally reaches 600-800mg/l, which is difficult to reach below 500mg/l. The characteristics of kitchen waste wastewater treatment are high pollutant concentration and high nitrogen content. MBR treatment technology and chemical treatment facilities are used to effectively remove COD and nitrogen.

The treatment of kitchen waste wastewater adopts the process of air flotation+biochemistry+MBR, with high sludge concentration, greatly reduced building capacity, low engineering investment, stable treatment effect, and high cost-effectiveness.

Process for treating kitchen waste wastewater: After anaerobic fermentation, the wastewater still contains a large amount of suspended solids and oils. To ensure the normal operation of the subsequent treatment process, it is necessary to remove the oils and suspended solids from the wastewater. Therefore, before entering the MBR treatment system, the wastewater first enters the cyclone degreaser, and then enters the air flotation tank to remove oil and large particulate matter from the wastewater.

Air flotation tank: Sewage flows into a small dissolved air tank equipped with a diffuser (or gas-liquid mixing pump), and the microbubbles generated in the expansion section during the sewage rise process are fully mixed. Due to the density imbalance between the gas water mixture and the liquid, a vertical upward buoyancy is generated, bringing the SS to the water surface. During the buoyancy process, microbubbles adhere to the SS, and the SS that reaches the water surface is supported and maintained by these bubbles. The SS floating slag on the water surface is removed by a chain scraper.

The ultrafiltration part of the MBR system adopts internal (external) ultrafiltration membrane components and an online cleaning system. The pre treated wastewater enters the biochemical tank, which is the MBR biochemical treatment system located inside (outside). The MBR bioreactor consists of a pre denitrification tank and a nitrification tank, both of which are secondary denitrification tanks and nitrification processes. In the nitrification tank, most organic compounds are degraded by highly active aerobic microorganisms, oxidizing ammonia nitrogen and organic nitrogen into nitrate and nitrite, which are then returned to the denitrification tank and reduced to nitrogen in an anaerobic environment, achieving the goal of denitrification. To improve the utilization rate of oxygen, an efficient internal circulation jet aeration system is adopted, with an oxygen utilization rate of up to 35%. Sludge reflux can increase the sludge concentration in the biochemical reactor to 15g/L. Through continuous domestication of microbial communities, organic matter in wastewater that is difficult to biodegrade can also be gradually degraded. The pre denitrification reactor maximizes the utilization of carbohydrates present in wastewater. The removal rate of ammonia nitrogen in the nitrification denitrification tank can reach over 90%, and the high pollutant removal load and sludge concentration can reach 15g/L. This process can effectively complete the treatment of kitchen waste and wastewater.
餐厨垃圾废水处理