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以甘蔗渣为缓释碳源及载体,负载硫酸盐还原菌(SRB)处理含低浓度Cu~(2+)离子的模拟矿山淋滤水,研究了缓释碳源、p H、ORP、SO2-4、COD等对矿山淋滤水中Cu~(2+)去除效果的影响,并探讨了处理过程中铜元素的形态及归趋模式。结果表明:在处理过程中p H呈现缓慢升高趋势,ORP全部降至-100 m V以下;硫酸根还原率可达92.4%;甘蔗渣作为缓释碳源释放稳定,COD可稳定保持200~300 mg/L之间;负载在甘蔗渣载体上的菌群可耐受高浓度Cu~(2+)的毒性抑制,并利用缓释碳源甘蔗渣释放出的小分子物质将硫酸根持续还原;至实验期结束,20 mg/L的Cu~(2+)浓度降至0.5 mg/L以下,较高浓度的Cu~(2+)拟通过多级反应器串联进行逐级去除;SO2-4和Cu~(2+)的反应速率比表明,SRB每还原约15 mg SO2-4,就有1 mg Cu~(2+)得到去除;Cu~(2+)主要是以硫化物的形式得以去除。
The slow-release carbon source, p H, ORP, SO 2 (superscript 2 +) were studied with bagasse as sustained-release carbon source and carrier with sulfate-reducing bacteria loaded with simulated mine leachate containing low concentrations of Cu 2+ ions. -4, COD and other effects on the removal of Cu 2+ from the leaching water in mines, and discussed the morphology and fate pattern of copper during the treatment. The results showed that p H showed a slowly increasing trend during the treatment, ORP all decreased below -100 mV; sulfate reduction rate reached 92.4%; sugar cane bagasse released as sustained release carbon source and COD remained stable for 200 ~ 300 mg / L. The bacterial population supported on the bagasse carrier could tolerate the inhibition of Cu 2+ in high concentration and the sustained release of sulfate At the end of the experiment period, the Cu 2+ concentration of 20 mg / L dropped to below 0.5 mg / L, and the higher concentration of Cu 2+ was to be removed step by step through multistage reactors in series. SO 2 2- The reaction rate ratio between Cu 2+ and Cu 2+ showed that 1 mg Cu 2+ was removed every about 15 mg SO 2 -4 reduction in SRB. Cu 2+ was mainly in the form of sulfide To be removed.