The milk processing industry is an important category of food processing and production in China. Milk is rich in a variety of amino acids, proteins, calcium, vitamins and other nutrients, and its by-products are diverse, such as milk powder, cheese, yogurt, cream, etc., so the industry is huge and the economic development value is very high. Milk processing includes raw milk quality testing, sterilization, concentration, filler filling, etc., as well as evaporation and UHT processes in the process of processing as by-products. During these processes, a large amount of processing wastewater containing proteins, whey, inorganic salts, bacteria such as E. coli, and impurities such as fats are generated.
Milk processing wastewater is mainly characterized by high organic matter content, rich nutrients, perishable and odorous, and the discharge into the environment will affect the balance of the ecosystem. At present, many milk processors use MBR membrane technology to treat wastewater. MBR membrane is a physical filtration technology that can separate pollutants in various wastewater, and is highly specialized in filtering milk processing wastewater.
First of all, the effluent quality of the MBR membrane is stable. This is because of its small membrane pore size, which provides higher filtration accuracy than common physical filtration methods. It has high porosity and good water permeation effect, which can fully separate whey, calcium, phosphorus, protein and other substances in milk processing wastewater, and can also intercept various bacteria and pathogenic microorganisms. Secondly, the MBR membrane has stable anti-fouling ability, its membrane channel is smooth, the flux is large, it is not easy to be blocked, and it is not easy to compaction. Therefore, MBR membrane is not easy to compact, easy to clean and maintain, and has little maintenance burden.
Compared with the traditional biochemical treatment of wastewater, MBR membranes do not require high-temperature concentration and additives, and the energy consumption is greatly reduced. It is made of chemically stable PVDF material, which can adapt well to various chemical cleaning methods, and will not easily react with the compounds in the wastewater, and has good performance in pollution and corrosion resistance. In addition, it can withstand high mechanical strength, does not break easily, is easy to automate, and effectively saves investment costs. Therefore, the application of MBR membrane technology in milk processing can effectively solve the problem of processing wastewater pollution.
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