强碱性高硫离子选矿药剂生产废水处理改造工程实例

Engineering Reconstruction Treatment of Beneficiation Reagents Production Wastewater with High pH and High Sulfion Concentration

针对选矿药剂生产废水中硫离子浓度高、碱性强、有机物浓度高等特点,以辽宁省某选矿药剂厂废水处理改造工程为实例,采用生物曝气除硫-厌氧发酵-生物接触氧化组合工艺升级原有A/O工艺对强碱性高硫离子选矿药剂生产废水进行处理。工程结果表明,本组合工艺在平均进水COD为2 134.2 mg/L,S_2~为213 mg/L的情况下,处理出水COD为190.5 mg/L,S^(2-)为0.7 mg/L,去除率分别高达91.07%和99.67%,工艺改造有效避免高S^(2-)对生化系统活性抑制,并有效中和了废水的强碱性,出水水质可稳定满足辽宁省污水综合排放标准(DB 21/1627-2008)排入城市污水处理厂标准。本组合工艺充分利用原有构筑物,且无需外源水处理药剂的投加,运行成本分析表明废水处理运行费用仅为7.71元/m^3,具有运行效果良好、升级改造简便和处理成本经济等显著优势。

Aimed at the characteristics of beneficiation reagents production wastewater, such as high concentration of sulfion, strongly alkaline and high concentration of organic matter, a combined process of bio-aeration desulfurization-anaerobic digestion-bio-contact oxidation was employed for wastewater treatment of a plant in Liaoning. The reconstruction was on the basis of an original A/O process in the plant. The results showed that, when the average concentrations of COD and sulfion were 2 134.2 mg/L and 213 mg/L in influent respectively, the effluent concentrations of COD and sulfion were 190.5 mg/L and 0.7 mg/L respectively by this combined process, which indicated that the final removal rates could reach 91.07% and 99.67%respectively. The reconstruction process could avoid the inhibition of sulfion on the organics removal, and neutralize strongly alkaine in wastewater, the effluent quality after this combined process treatment could reach the demand of Integrated Wastewater Discharge Standard of Liaoning Province（DB21/1627-2008）. The combined process took full advantage of original constructions and had no need for water treatment agent dosage, and the operating cost was only 7.71 yuan/m^3. This combined process had advantages including good operation effect, convenient reconstruction and low processing cost.