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Commonly used pretreatment methods for purified water
Regardless of the direct use of EDI equipment or ion exchange systems, coupled with reverse osmosis systems, ordinary surface water, tap water, and industrial water often cannot meet the requirements of ion exchange resins or reverse osmosis for the influx of sewage substances. Only after the raw water is properly pretreated can the water quality requirements of the water production system be met. Next, experts from Shenzhen Kerui Environmental Protection Equipment Co., Ltd. came to analyze several pretreatment methods commonly used in the raw water end of purified water equipment.
Raw water reaches an expected index to meet the requirements of the purification process on raw water. Some substances that do not meet the purification process include heavy metals, organics, colloids, suspended matter, microorganisms, and free chlorine in the free state.
1. When the content of suspended particles in the source water is less than 50mg / L, contact coagulation or filtration can be used, that is, after adding the coagulant, it is directly injected into the filter through a pump or pipe. Currently, most media filters are used.
2. When the hardness of carbonate in raw water is high, lime can be added for pre-softening while removing turbidity. Of course, the methods currently used are cation exchange resins or scale inhibitors.
3. When the organic matter content in the raw water is high, it can be treated by adding chlorine, coagulation, clarification and filtration. If it still fails to meet the water intake requirements of subsequent processes, it can add measures to remove organic matter such as activated carbon filtration.
4. When the free chlorine in the raw water exceeds the subsequent water inlet standard, it can be treated by activated carbon filtration or adding sodium sulfite.
5. If reverse osmosis or EDI equipment is used in the subsequent treatment process, a (group) precision filtering device should be added before the raw water is put into the equipment as a protective measure for reverse osmosis and other equipment.
6. If the colloidal silicon is required in the subsequent process, magnesium oxide can be added at the same time as adding lime to achieve the purpose of removing silicon.
7. When the content of iron and manganese in the raw water is high, aeration and filtering devices should be added to remove iron and manganese.
The above seven methods are generally several pretreatment methods commonly used for purified water. Through the above methods, substances that do not meet the purification process in the raw water can be removed to meet the water inlet requirements of the purified water-to-water production system.