Zero-discharge treatment system and treatment process for production wastewater in iron and steel industry

• Main Authors: LI WULIN, ZENG ZHENGUO, JIA BOLIN, LIU YANPING, YIN LEI, LI KUAN, CHEN YUANYUAN, JI XIANHUA, XIE WEI
• Format: Patent
• Language: Chinese; English
• Published: 18.04.2023
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses an iron and steel industry production wastewater zero discharge treatment system and process, the treatment system comprises a primary membrane concentration system, an intermediate membrane concentration system, a final membrane concentration system and an evaporative crystallization system which are arranged in sequence, the primary membrane concentration system comprises a pretreatment module and a primary filtration module, the primary filtration module is provided with a primary reverse osmosis unit, the intermediate membrane concentration system comprises an intermediate softening treatment module and an intermediate filtration module, the intermediate filtration module comprises an intermediate reverse osmosis unit, and the final membrane concentration system comprises a final oxidation treatment module, a final softening treatment module and a final filtration module. The final filtration module comprises a concentrated water nanofiltration unit and a high-pressure reverse osmo