Abstract:

In order to make the treatment effluent from chromium-containing wastewater discharged in aluminum alloy production meet the requirement of Cr⁶⁺≤0.5 mg/L，the reduction-precipitation process has been made with Na₂SO₃ and Na₂S₂O₅，respectively. The factors affecting treatment efficacy are analyzed and compared. The resultsshow that when the chromium-containing wastewater discharged from aluminum production is reduced，the dosage of Na₂S₂O₅ can be 25.0%-37.5% less than the dosage of Na₂SO₃. In the process of treatment，the coagulation-precipitation pH should be controlled between 8.2-9.0，dosage of PAM is about 0.010 g/L，and precipitation time should be ranged between 1-2 h.

Key words: chromium-containing wastewater, Na₂SO₃, Na₂S₂O₅

摘要：

为使铝型材生产产生的含铬废水的处理出水达到Cr⁶⁺≤0.5 mg/L要求,分别选用Na₂SO₃和Na₂S₂O₅进行还原沉淀处理,并对影响处理效果的因素进行了分析比较。结果表明,还原处理铝型材生产产生的含铬废水时,Na2S2O5的投加量可比Na₂SO₃减少25.0%～37.5%;处理过程中,应控制混凝沉淀pH为8.2～9.0、PAM投加量为0.010g/L、沉淀时间为1~2 h。

关键词: 含铬废水, Na₂SO₃, Na₂S₂O₅

CLC Number: 

• X703