Strengthened pretreatment system for high-salt-content industrial wastewater and production process of strengthened pretreatment system
A technology for industrial wastewater and high salt content, applied in the field of water treatment, can solve the problems of complex composition, high salt content, and high pollutant concentration, and achieve the effects of high purity of crystalline salt, thorough salt separation, and low operating costs.
Inactive Publication Date: 2016-04-27
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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[0008] Aiming at the characteristics of high salt content, high concentration of pollutants, and complex components in the current high-salt industrial wastewater of coal chemical industry, as well as many problems in the existing "zero discharge" treatment process of high salt water, the present invention provides a high-salt industrial wastewater Enhanced pretreatment system and its treatment process
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[0033] High-hardness silicon-containing concentrated salt wastewater discharged from a coal chemical enterprise, the wastewater COD≤100mg / L, TDS≤50000mg / L, NaCl≤7600mg / L, NaCl≤7600mg / L, Na 2 SO 4 ≤8000mg / L, total hardness ≤3500mg / L, SiO 2 ≤220mg / L.
[0034] (1) chemical softening
[0035] Calcium, magnesium and SiO in wastewater are removed by adding liquid caustic soda, sodium carbonate and magnesite to the reaction tank 2 . After the raw water is precipitated by 32% liquid caustic soda, 15% sodium carbonate and 20% magnesite, the addition of 10% polyferric sulfate (coagulant) and 1‰ PAM (coagulant aid) After coagulation, flocculation and other reactions in the sedimentation tank, it enters the tubular microfiltration membrane system for solid-liquid separation. The removal rate of the total hardness of the product water is ≥95%, SiO 2 The removal rate is ≥82%. After making the effluent turbidity ≤ 1NTU, it enters the membrane system, and the concentrated water goes dir...
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Abstract
The invention relates to a strengthened pretreatment system for high-salt-content industrial wastewater and a process of the strengthened pretreatment system and belongs to the field of water treatment. The high-salt-content industrial wastewater enters an adjusting tank through a pipeline for water quality and water quantity adjustment, liquid caustic soda is added to a pipe mixer at the front end of a reaction tank, sodium carbonate and magnesia are added to the front end of the reaction tank, and most of calcium, magnesium, SiO2, total alkali, suspending substances and a part of organic matters are effectively removed in the reaction tank; polymeric ferric sulfate and PAM (polyacrylamide) are added, floc is generated and enters a tubular micro-filtration membrane system, solid-liquid separation of the floc and a liquid is realized through cross flow filtration and interception of a membrane, producing water of a tubular micro-filtration membrane enters an STRO system and is directly recycled after being concentrated, the concentrated water enters a nanofiltration salt separation system for salt separation when the concentration of TDS (total dissolved solids) of the concentrated water reaches 120,000 mg / L. The strengthened pretreatment system has the advantages as follows: through arrangement of the tubular micro-filtration membrane, the investment and the occupation area of a sedimentation tank, a filtration tank, an ultrafiltration system and other systems are reduced; the scale and the investment cost of the nanofiltration membrane system are reduced due to high TDS of the concentrated water, and the operation cost is low.
Description
technical field [0001] The invention belongs to the field of water treatment, and relates to an enhanced pretreatment system for high-salt industrial wastewater and a treatment process thereof. Background technique [0002] In recent years, the development of my country's industrial economy, water resources and environment has been extremely uncoordinated. In order to solve such problems, the reuse of effluent wastewater and "zero discharge" technology were first proposed in the "China Water Saving Technology Policy Outline" promulgated in 2005. For coal chemical wastewater "zero discharge" is to treat all process organic wastewater and saline wastewater generated in the enterprise for reuse. [0003] The main sources of high salt water in the coal chemical industry include drainage from the desalinated water system, sewage from the circulating water system, concentrated water from the reuse water treatment system, and boiler drainage. These high-salt brines with high sali...
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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/001C02F1/442C02F1/444C02F1/52C02F1/66
Inventor 刘慧王俊辉赛世杰李战胜薛源刘丹茹张娜郭默然齐婧党平姚红锐李思序高贵和杭天浜
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH