1. Water quality management of tap water
In order to ensure that the quality of drinking water meets the relevant national water quality standards and to ensure the safety of people's drinking water, the water company has formulated a series of water quality management systems. Strictly control the quality of raw water from water source inspection, preliminary inspection of raw water quality at the water intake, biological tank observation, and re-inspection of raw water before entering the mixing tank; mixing tank water, water behind the grid reaction tank, water to be filtered, and filtered water, etc. Water is regularly sampled at each stage of processing to ensure the safety of tap water production; establish strict production management systems, improve employees' awareness of safe production, and improve the corresponding supervision system to eliminate man-made hidden dangers in production safety; establish corresponding emergency plans to face special The situation is calm and handled properly. Due diligence to ensure safe water supply.
2. Flow and function of tap water
2.1 Raw water → mixing tank → grid reaction cell
Liaoyuan water refers to tap water production water that has not been processed. The raw water usually contains particles such as algae, sand, and so the first step in the production of tap water is to add a "water purification agent" --- basic aluminum chloride to the raw water. Basic aluminum chloride can generate a positive charge in raw water, causing slight particles in water to be subjected to static electricity to form larger particle clusters, which eventually form a precipitate. At the same time, you can choose whether to perform the "pre-chlorine" dosing according to the condition of the raw water. Its main functions are: (1) coagulant, oxidizing humus and colloid in water, making it easy to coagulate and precipitate; The amount of algae in the raw water determines the amount to be added to kill the algae in the water; (3) a sterilant, which increases the contact time between the raw water and chlorine, and kills bacteria and germs contained in the raw water. "Before adding mud" means that when there is too much algae in the water, the adsorption capacity in the water is increased, so that the water purification agent can play a more effective role. "Pre-addition of alkali" means that when the pH of the raw water is too low, it will affect the coagulation and sedimentation effect of the water body. Therefore, it is necessary to add alkalis such as lime to increase the precipitation effect of the water and keep the pH value of the factory water at neutral. The raw water is added with a number of agents such as water purification agents, and then passes through the mixing tank and the grid reaction tank, so that the light particles in the water have enough time to form larger particle clusters.
2.2 Grid Reaction Cell → Inclined Tube Sedimentation Tank
This step is mainly sedimentation. Raw water enters the inclined tube sedimentation tank from the grid reaction tank. When relatively large particles in the water pass through the inclined plate of the sedimentation tank, they will attach and eventually settle to the bottom of the inclined plate. After this process, the water quality Will be greatly improved. Various impurities under the sediment will be regularly removed by the sludge truck, and the sedimentation tank will always be kept in a clean state.
2.3 Inclined tube sedimentation tank → air-water backwash filter → clear water tank
This process mainly functions as a filter. Water flows into the filter along the water collection tank on the inclined pipe sedimentation tank. The remaining small impurities in the water will be gradually filtered and adsorbed by the sand in the filter. The filtered water will follow the pipeline. Flow to clear water for storage. If the production process is single-point chlorine injection, then the residual chlorine content in the clear water tank has reached the requirements of the factory water standard. Bacteria and E. coli in the water body have been mixed with chlorine for a long time to be effectively treated. Purified water The treatment process has been basically completed here; if chlorine is injected at two points, it is necessary to add an appropriate amount of chlorine in the clear water tank to make the residual chlorine content reach the standard, and at the same time mix for more than half an hour to ensure that bacteria and E. coli in the water body are effectively Remove.
2.4 Clean water pool → Secondary pump house → Water supply network
The sterilized tap water will be stored in the clear water tank. After being pressurized by the pump in the secondary pump room of the water plant, the clean tap water will flow into the households along the water supply pipeline. In order to ensure the safety of the water supply network, the water supply plant selects reasonable network points according to the distribution of the network and the population distribution, and conducts daily spot checks on the water quality of the network points; The end of the pipeline is flushed regularly to prevent secondary pollution caused by bacterial growth and ensure the safety of water supply.