What are the common pretreatment methods for stainless steel industrial pure water equipment at the raw water end?
Stainless steel industrial water equipment in the raw water end common pretreatment method which writer:? Whether using EDI device or ion exchange systems, coupled with the reverse osmosis system, ordinary surface water, tap water, industrial water, are unable to meet Ion exchange resin or reverse osmosis requires water ingress of fouling substances. Only after the raw water undergoes a certain pretreatment, can it meet the water quality requirements of the water preparation system. Today, the editor mainly talks about the common pretreatment methods of stainless steel industrial pure water equipment at the raw water end. When the raw water of the stainless steel industrial pure water equipment reaches the expected index, it can meet the requirements of the raw water in the purification process. The substances in the raw water that cannot meet the purification process include heavy metals, organic matter, colloids, suspended substances, microorganisms, free residual chlorine, etc. 1. When the content of suspended particles in the raw water is less than 50mg/L, contact coagulation or filtration can be used, that is, after adding coagulant, it is directly injected into the filter through a water pump or pipeline. At present, most of the multi-media filters are used. 2. When the carbonate hardness in the raw water is high, lime can be added for pre-softening while removing the turbidity. At present, the most widely used method is cation exchange resin or adding scale inhibitor. 3. When the content of organic matter in the raw water is high, it can be treated by chlorination, coagulation, clarification and filtration. If the water intake requirements of the subsequent process are still not met, activated carbon filtration can be added to remove the organic matter. 4. When the free chlorine in the raw water exceeds the subsequent water inlet standard, it can be treated with activated carbon filtration or the addition of sodium sulfite. 5. If equipment such as reverse osmosis or EDI is used in the subsequent treatment process, a (group) precision filter 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 subsequent work has higher requirements for colloidal silicon, magnesium oxide can be added while 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.
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