Adding pretreatment technology: The so-called adding pretreatment technology is to carry out treatment in the conventional process. Through scientific and reasonable treatment technology, the pollutants in the water are removed, the consistency of the subsequent process is reduced, and the treatment effect is improved. At present, the additional pretreatment technology of slightly polluted source water mainly includes three aspects: The first is the adsorption pretreatment technology. Use the adsorption properties of substances to remove pollutants in water sources. Commonly used adsorbents are: zeolite, activated carbon, etc. Relevant expert studies have shown that the use of activated carbon with different particle sizes to adsorb organic matter in water sources has a good effect, but the adsorbent is difficult to recycle and reuse, and the cost is relatively expensive. The second is biological pretreatment technology. It can effectively remove organic matter and NH3-N pollutants in water. The biological pretreatment process mainly includes biological contact oxidation, biological expanded bed and fluidized bed, biological turntable, biological fluidized bed, etc. The efficiency of surface biological pretreatment technology to remove algae pollutants in micro-polluted water sources is as high as 60%-85%. However, the one-time investment cost is high, and it is easily affected by temperature. The third is chemical oxidation pretreatment, the main principle of which is to use oxidation to destroy pollutants, decompose and transform pollutants, and reduce their concentration and toxicity. Commonly used oxidizing agents include chlorine, chlorine dioxide, and ozone. The efficiency of removing COD
Mn from slightly polluted water sources is 30% to 60%, and the cost is low, so it has a good application prospect. Strengthening conventional processing technology: Strengthening conventional processing technology is to achieve the purpose of effectively removing pollutants through the transformation and upgrading of conventional processing technology. Its main feature is that it does not need to add other equipment, but only needs to improve the processing capacity of the original equipment and reduce micro-polluted source water. To achieve turbidity, improve water quality, and reduce treatment costs. Including: enhanced coagulation, enhanced filtration, etc. Advanced treatment technology: First, membrane treatment technology. The principle of sewage treatment is to use the ability of water molecules in raw water to pass through the separation membrane to remove chroma, odor, and disinfection by-products in the water, so as to obtain drinkable water. Water source is also the most common technology for micro-polluted water source water treatment at present, including: microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane and other technologies. A large number of experimental studies have shown that the removal efficiency of DOC and UV254 by membrane technology is 30% and 45%, the removal rate of algae cells reaches 100%, and the removal rate of chlorophyll a is 96%. As a new water treatment technology, membrane technology has attracted more and more attention, and has broad application prospects in micro-polluted water treatment. Second, the ozone-biological activated carbon technology belongs to a multi-technology integration micro-pollution treatment technology, and it is also the main technology in the treatment of micro-polluted water source water in my country. It can reduce the nutrient index of the effluent and improve the safety and stability of drinking water. , with the development of science and technology in our country, this micro-polluted water source treatment technology is widely used in urban deep water treatment.
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