ZHANG Yi-bo,LI Meng,DU Ning,et al.Treatment and Synchronous Utilization of Chromium?containing Wastewater in Steel Cold Rolling Production Line[J].China Water & Wastewater,2022,38(No.2):110-115.
Treatment and Synchronous Utilization of Chromium?containing Wastewater in Steel Cold Rolling Production Line
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第2
Page:
110-115
Column:
Date of publication:
2022-01-17
- Abstract:
- Aiming at the problems such as the total effluent chromium other than Cr (Ⅵ) could not meet the standard stably in the chromium-containing wastewater discharged from a steel cold rolling units and the chromium sludge has to be shipped outside the factories as hazards wastes, the fiber adsorption technology was employed to ensure the effluent quality to meet the requirement of national sewage discharge standard, and the ion exchange technology was used to realize resource utilization of Cr (Ⅵ). Based on the pilot test, the suitable operation period of the adsorption system and pH of the ion exchange system were determined. After system optimization, the effluent concentrations of Cr (Ⅵ) and total Cr kept below 0.048 mg/L and 0.1 mg/L respectively, which meet the Discharge Standards of Water Pollutants for Iron and Steel Industry (GB 13456-2012). Compared with the original process, it is not necessary to adjust the pH, thus greatly saving the treatment costs. Additionally, the output of chromium sludge is reduced by over 90%, and the accumulated and conversed chromate solution can be utilized. According to the statistics, the comprehensive economic benefit can approach to 5.206 million yuan/a.
Last Update:
2022-01-17