Water treatment process first production process - the reaction, the process includes "raw water - → mixing tank - → grid cell." Raw water refers to untreated water production water. Normally raw water contains fine particles such as algae, humus and sediment. The first step in tap water production is to add "water purifier" to the raw water - basic aluminum chloride (commonly known as alum) , Basic aluminum chloride in the raw water can produce a positive charge, so that the water of the small particles by electrostatic interaction and the formation of larger particles to easily precipitate. The "pre-chlorination" can be based on the choice of raw water whether to vote, its main effects are: ① coagulant, the main oxidation of water in the humus and colloids, so that it can produce coagulation and sediment; ② algaecide, according to the original The amount of algae in the water to decide whether to vote (the water content of algae can produce odor), to kill algae. "Before adding mud" is too much algae in water, increase the adsorption capacity of water, so that water purifying agent can play a more effective role. "Pre-alkali" is raw water PH value is too low, affecting the coagulation and sedimentation of water, it is necessary to add lime and other bases, increase the precipitation effect of water, and make its factory water PH value remained neutral. Raw water after adding a number of agents such as water purifying agent, and then through the mixing tank and grid reaction tank, so that the water of the small particles have enough time to form larger particles. The second production process - precipitation, the process includes "grid reaction tank - → inclined tube sedimentation tank." At this time, the raw water flows from the grid reaction tank into the inclined tube sedimentation tank, and when the larger particles in the water pass through the inclined plate of the sedimentation tank, it will adhere to and settle on the bottom of the inclined plate. After this treatment, the water quality becomes Nearly clear as a mirror. The sedimentation sludge discharged regularly by the mud truck to keep the sedimentation tank clean. The third production process - filtration, the process includes "inclined tube sedimentation tank - → air and water backwash filter - → clear pool." Gurgling clean flow along the sedimentation tank inclined tube pool above the collection pool inflow filter, the water of fine impurities by the filter filter and activated carbon adsorption (when the filter after the accumulation of impurities in impurities to a certain extent, the filter also To carry out regular 〃 air and water backwash 〃 cleaning, in order to maintain a good filtering effect), clean and clarified filtered water flows along the pipe to a clean water tank for storage and re-dosing liquid chlorine in water for some time disinfection of water Of bacteria, E. coli and other germs to kill, the entire water purification process has been completed. The fourth process - pressurized water supply, the process includes "clean water - → two pumping stations - → water supply network." The sterilized tap water is stored in the clean water pool, and after the water pump of the second water pumping station of the water plant is pressurized, the clean running water flows along the water supply pipeline and flows into every household. At present, the vast majority of urban water plants that use surface water as their source of water use conventional processes of coagulation, sedimentation, filtration and disinfection. The classic materialized treatment process has continued for more than a hundred years, the only changes in the pool has been on the development.