What are the core advantages of the zero-discharge technology for fermentation-related industrial wastewater?
What are the core advantages of the zero-discharge technology for fermentation-related industrial wastewater? Author of the article: a source of industrial waste fermentation class in recent years, my country's rapid development of industrial fermentation industry category, generated a lot of waste. Fermented industrial products are mainly produced with rice, wheat, dried potato and their agricultural and sideline products as the main raw materials. The production process of fermentation generally needs to go through the steps of strain screening, seed preparation, microbial fermentation, fermentation broth pretreatment and solid-liquid separation, refining and purification, refining, drying, and packaging. During the production process, there will be a large amount of high Concentration of organic wastewater, which causes serious pollution to the environment. This wastewater can be divided into four main categories: (1) Main production process drainage; (2) Auxiliary process drainage; (3) Flushing water; (4) Domestic sewage. It can be seen that there are many drainage points for fermentation industrial wastewater during the production process. The separate discharge of high and low-concentration wastewater is conducive to the separation of clean sewage, intermittent discharge of high-concentration wastewater, relatively large changes in pH and temperature, and high concentration of pollutants, such as waste. The COD of filtrate, waste mother liquor, etc. is generally above 10 000 mg/L. 2. Fermentation wastewater treatment process 1. Aerobic moving bed biofilm method (MBBR) MBBR is to increase the biomass and biological species in the reactor by adding a certain amount of suspended carriers to the reactor, thereby improving the performance of the reactor. A sewage treatment method of treatment efficiency. Since the density of the filler is close to that of water, it is completely mixed with water during aeration, and the environment where microorganisms grow is gas, liquid, and solid. The collision and shearing effect of the carrier in the water makes the air bubbles smaller and increases the utilization rate of oxygen. In addition, each carrier has different biological species inside and outside, with some anaerobes or facultative bacteria growing inside, and good cultivating bacteria outside, so that each carrier is a micro-reactor, so that nitrification and denitrification reactions exist at the same time. , Thereby improving the treatment effect. The method is a new and efficient sewage treatment method, which has the advantages of both the traditional fluidized bed and the biological contact oxidation method, and gives full play to the advantages of both attached biofilm and suspended activated sludge. Compared with ordinary fillers, the power consumption is extremely low, and it can be in frequent and multiple contact with wastewater, so it is called 'moving biofilm'. There are many kinds of microorganisms in MBBR, and each microorganism is highly specific; the food chain is long. The sludge concentration is 5-10 times higher than that of the ordinary activated sludge method, and the total mass concentration of sludge in the aeration tank can reach up to 30-40 g/L, which can form a food chain from bacteria → protozoa → metazoans in the packing unit; The sludge sedimentation performance is strong, which is convenient for solid-liquid separation; at the same time, it can treat low-concentration sewage. 2. Specific fluidized biofilm method (SMBBR) SMBBR process technology is an improved technology based on MBBR. According to the characteristics of MBBR, the special SDC-03 type polyethylene biological carrier is selected as the filler, and the specific high-activity denitrifying bacteria DNF409 is selected as the strain to form the SMBBR process. The operation mode of SMBBR is similar to that of traditional MBBR: under the condition of sufficient oxygen, microorganisms gather and adhere to the surface of the filler to form a biofilm. When wastewater flows through the filler at a certain flow rate, the microorganisms in the biofilm can absorb and decompose the water. Organic matter, so that sewage is purified, while microorganisms are proliferated, and the biofilm is gradually thickened. When the biofilm reaches a certain thickness, the oxygen diffusion into the biofilm is restricted, so the inner layer will be in anoxic or anaerobic state, but the surface is still aerobic, forming an effective anaerobic-aerobic treatment mechanism. The project adopts the first-stage air flotation-facilitating-MBBR-SBR-secondary air flotation process, which not only improves the biodegradability of high-concentration wastewater and improves its organic degradation ability, but also has a two-stage biochemical system and a two-stage combined air flotation Water as a guarantee. The system has been operating stably since it was put into operation for more than a year, and the effluent has met the requirements of 'Water Quality Standard for Sewage Discharged into Urban Sewers' (CJ 3082—1999).
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