DU Ning,YU Tai-ping,HE Yan-zhao,et al.Optimization and Application of Chromium Containing Wastewater Treatment Process in Metallurgy Industry[J].China Water & Wastewater,2020,36(17 17):90-94.
Optimization and Application of Chromium Containing Wastewater Treatment Process in Metallurgy Industry
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
17 17
Page:
90-94
Column:
Date of publication:
2020-09-01
- Abstract:
- In order to solve the problems of unstable total Cr concentration in the effluent, large dosage of agents and high production of chromium sludge in the reduction-precipitation process of a steel plant in the central region, the treatment process of the plant was thus upgraded and reconstructed. Based on the original process, ORP value of the secondary reduction tank was used as an indicator of a self-controlled agents system, hydraulic conditions of the flocculation stage were optimized, and combination of NaOH/Ca(OH)2 was used to adjust the pH value of the neutralization tank. After optimization of the process, average concentrations of Cr(Ⅵ) and total Cr in the effluent were 0.02 mg/L and 0.07 mg/L, respectively, which reached the standard of table 3 in Discharge Standard of Water Pollutants for Iron and Steel Industry (GB 13456-2012). Meanwhile, dosage of the reducing agents and chromium sludge yield were decreased, and the operational cost was significantly reduced.
Last Update:
2020-09-01