ZHAO Li-juan,SHAO Qi-yun,XIE Qing-jie.Application of Reverse Osmosis for Treatment of Stainless Steel Production Wastewater in a Zero Discharge Project[J].China Water & Wastewater,2021,37(17 17):94-99.
Application of Reverse Osmosis for Treatment of Stainless Steel Production Wastewater in a Zero Discharge Project
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
94-99
Column:
Date of publication:
2021-09-01
- Abstract:
- As the wastewater from a stainless steel production enterprise is characterized by high acidity, strong toxicity, large flow rate and difficult to treat, a zero discharge project based on the combined process of pretreatment, reverse osmosis and MVR was designed with reverse osmosis process as the core technology. When the operating pressures of the first, second and third stages were 1.2 MPa, 1.7 MPa and 2.2 MPa, respectively, and the reflux rate of the concentrated water was 50%, the conductivity of the wastewater decreased steadily from 2 075-2 133 μS/cm to less than 30 μS/cm after treatment by the reverse osmosis system. The average removal efficiencies of COD, NH3-N, TN and TP were above 88%, 65%, 88% and 97%, respectively. The recovery rate of the wastewater was between 87% and 92%, and the total desalination rate of the system was above 98%. The total operating cost of the zero discharge system was 56.83 yuan/m3, among which the operating cost of the reverse osmosis system was 5.35 yuan/m3. The comprehensive income of the process reached 130 800 yuan/year.
Last Update:
2021-09-01