Abstract:

Two kinds of reductants,sodium pyrosulfite sodium metabisulphite and ferrous sulfate combination,have been used for the reduction treatment of wastewater containing chromium.The optimum parameters of each stage can be obtained by using PAM as coagulant,doing orthogonal tests,and analyzing the effluent water quality and the output of heavy metal sludge.The mass concentration of the final effluent Cr⁶⁺ is 0.19 mg/L,and the total removing rate of Cr⁶⁺ is 99.99%. When Cr⁶⁺ is reduced,continual adjustment of pH during the treatment is not necessary.Therefore,the operation process is simplified greatly.At the same time,the pilot scale production is monitored and inspected. All of the effluent indexes can meet the requirements of the Discharge Standard of Electroplating Pollutants（GB 21900—2008）.

Key words: chromium-containing wastewater, precipitation process, heavy metal sludge

摘要：

选用焦亚硫酸钠和硫酸亚铁两种还原剂联合还原处理高浓度含铬废水,并用PAM做混凝剂,利用正交实验通过对出水水质和重金属污泥产量的分析得出各阶段的最佳参数,最终出水Cr⁶⁺质量浓度为0.19 mg/L,总去除率为99.99%。该法在还原Cr⁶⁺时无需不断调整pH,大大简化了操作过程。同时对中试生产进行了监测,出水各指标均达到《电镀污染物排放标准》(GB 21900—2008)的要求。

关键词: 含铬废水, 沉淀法, 重金属污泥

CLC Number: 

• X703.1