Sewage treatment process requires many years of experience in the sewage business. For many of our users sewage treatment transformation process analysis. Can be drawn as follows: A set of high efficiency, low-cost basic operating mode (on this basis, according to the actual situation of enterprises can increase or decrease), so that water can ensure discharge standards. Wastewater is generally used: "physical and chemical precipitation (or flotation) + anaerobic (or and oxygen) + aerobic + physico-chemical precipitation" combined process. It can be seen for the above, the first step of the physical and chemical precipitation is the use of a flocculation decolorizing agent with PAM coagulation, not only by the effective removal of more than 40% of COD and other suspended solids such as suspended solids, ammonia nitrogen, while its peculiar Decolorization, the first step can be achieved colorless or colorless wastewater! The cost of only a few dollars, to lay the foundation for low-cost operation. After the biochemical effluent, many enterprises, other indicators can achieve compliance, except for the presence of color, usually light yellow or brown. For example: coking wastewater, printing and dyeing wastewater. Papermaking wastewater and so on. Powerful units can be activated carbon adsorption or ClO2, O3 oxidation decolorization and even membrane decolorization. However, it is clear to all of you that these are the high cost of running a large investment! We compare the practice, from a large number of pharmaceutical out of a preferred biochemical effluent decolorizing agent. Depending on the color of the water, add the amount of cost control in the lowest case, the water color completely up to standard. In summary, many companies suffer from the chroma of trouble, may wish to test a lot of decolorizing agents, low-cost operations in the premise of solving the problem of color, to avoid high investment! Absorption of wastewater chrominance methods Currently used wastewater treatment technology point of view, can effectively remove the color of the wastewater adsorption method, coagulation, biological method, membrane separation, chemical oxidation and electroflocculation and so on. 1, adsorption decolorization Adsorption decolorization technology is to rely on the adsorption of adsorbent to remove the color. Commonly used adsorbents include renewable adsorbents such as activated carbon, ion exchange fibers and the like and nonrenewable adsorbents such as various natural minerals (bentonite, diatomaceous earth), industrial waste (cinder, fly ash) and natural waste (charcoal, Sawdust) and so on. At present, adsorbents for adsorption and decoloration mainly rely on physical adsorption, but ion exchange fibers and modified bentonites also have chemical adsorption. 2, flocculation decolorization coagulation decolorization is the use of flocculant flocculation wastewater sedimentation of the dye-forming substance for decolorization. Flocculation decolorization technology, low investment costs, equipment, small footprint, large capacity, is a commonly used decolorization technology. Inorganic coagulants include metal salts and inorganic polymer flocculants. Widely used metal salts are aluminum salt and iron salt; inorganic polymer flocculant is a new type of water treatment agent developed on the basis of the traditional metal salt flocculant, has the advantages of adaptability, non-toxicity, and can be Times to improve efficiency and relatively inexpensive advantages Beijing Institute of Printing Home, has been rapid development and extensive application. Organic polymer flocculant, polyacrylamide (PAM) the most widely used, it has non-ionic, cationic and anionic three. Oxidation decolorization Chemical oxidation decolorization refers to the use of chlorine, ClO2, O3, H2O2, HClO4 and hypochlorite oxidation, under certain conditions so that the chromogenic groups in the wastewater fracture or change its chemical structure, thus To achieve the purpose of decolorization of wastewater. Oxidation methods include chemical oxidation, photocatalytic oxidation and ultrasonic oxidation. Although the specific process is different, but the decolorization mechanism is the same. Chemical oxidation is the more mature research methods. Oxidants commonly used Fenton reagent (Fe2-H2O2), ozone, chlorine, sodium hypochlorite and so on. Biological decolorization Biological decolorization is the use of microbial enzymes to oxidize or reduce colored molecules, destroying their unsaturated bonds and chromophores to achieve the purpose of decolorization. Electrochemical decolorization electrochemical method is through the electrode reaction so that the wastewater purification. According to the electrode reaction mode, the electrochemical method can be subdivided into the internal electrolysis method, the electric flocculation and the electric float method, the electric oxidation method. The most famous method of internal electrolysis is iron filings. Membrane separation method bleaching In the field of sewage treatment process, the membrane separation method is the use of synthetic or natural polymer film to the outside energy or chemical potential difference as a driving force, the selective separation of pollutants in water, so that the wastewater purification Technology.
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