Sewage treatment in accordance with its role can be divided into physical, biological and chemical methods of three: 1, physical method: the main use of physical separation of sewage in the non-soluble substances, in the treatment process does not change the chemical nature. Commonly used gravity separation, centrifugal separation, reverse osmosis, air flotation. Physical method of treatment structures are relatively simple, economic, for village and town water capacity, self-purification ability, sewage treatment is not high requirements. 2, biological method: the use of microbial metabolism, the sewage is dissolved or colloidal state of organic matter decomposition and oxidation of stable inorganic substances, so that the sewage is purified. Commonly used activated sludge and biofilm method. 3, chemical method: is the use of chemical reactions to treat or recover sewage dissolved substances or colloidal substances, mostly used in industrial wastewater. Commonly used coagulation, neutralization method, redox method, ion exchange method. Chemical treatment method with good results, high cost, mostly used for biochemical treatment of effluent, for further treatment to improve the quality of effluent. The above method of biological method is more convenient and affordable and fast, now with the breakthroughs in microbiological research and the use of products, there is a kind of microbial strains of Bacillus subtilis to use the effect of the best. Bacillus subtilis can be converted to absorb nitrogen in aquaculture water or various sewage, the formation of new strains of bacteria, delay excessive nitrogen changes in the harm to aquaculture animals, bacteria as bait to be absorbed by aquatic animals is conducive to adjusting the micro-ecological balance of the intestinal tract of aquaculture animals, and is conducive to their growth.
Currently there are many producers of Bacillus subtilis on the market. But the quality is uneven, some although containing more bacteria, but the rate of heterozygous bacteria, the effect is not good, so when choosing must choose a big brand, Guangxi Beihai Qunlin Biological Engineering Co., Ltd. production of Bacillus subtilis in the advanced technology, quality and stability, the production of professional, in the country belongs to the leading level