冷轧含铬废水微电解处理的中试研究

Pilot-scale Treatment of Chromium Wastewater from Passivating Solution by Microelectrolysis Process

钢铁行业冷轧、硅钢生产过程中产生大量的含铬废水,目前一般采用亚硫酸钠还原法处理,药剂消耗量非常大。在2 m3/h的中试规模上研究了铁/碳微电解还原工艺对钝化液含铬废水的处理,六价铬通过铁炭填料后浓度有一定降低,废水pH稍有升高,氧化还原电位降低。研究结果表明,铁炭微电解工艺对于钝化液含铬废水有一定的处理效果,但由于可能存在含铬废水对铁屑表面造成钝化导致处理不够彻底。经济效益分析表明,微电解技术相比单独采用亚硫酸钠还原法有一定的成本优势,且处理出水效果好,可直接排放,不会产生二次污染。

Plenty of chromium wastewater is produced from iron and steel industries. Now chromium in the wastewater is generally reduced by sodium thiosulfuric and it needs more dosage. This study performs a pilot - scale （2 m3/h） treatment of the wastewater by microelectrolysis process. It is obtained that chromium concentration is decreased somewhat, aqueous pH is slightly increased and oxidation - reduction potential declines. The results suggested that iron/carbon micreclectrolysis process had somewhat effects on the treatment of chromium wastewater, but the treatment is not complete. So it is economical to adopt sodium thiosulfufic reduction process and the effluent is better and can be directively discharged, no produce of the secondary pollution.