厌氧-好氧反应器处理选矿废水的挂膜实验

 选矿废水中所含的选矿药剂种类多,毒性大,物质结构复杂,大多难以被微生物快速、有效利用,进入环境后可以长期存留,用物化法难以保证出水中有机浮选药剂长期稳定达标排放,因此用生物法处理选矿废水达标排放或便于回收利用已势在必行。本实验采用逐渐增加进水的选矿药剂浓度、固定水力停留时间的方法启动厌氧-好氧反应器,分析了其挂膜过程中对COD和浮选药剂浓度的去除效果及生物相的变化情况。结果表明,挂膜和驯化期间,系统对COD的去除主要集中在好氧反应器,厌氧反应器虽也有一定的去除效果,但去除率远远低于好氧反应器。反应器启动40d后,COD的总去除率稳定在55%,苯胺黑药、乙硫氮和丁基黄药的总去除率分别达到92%,84%和82%,且填料中的生物相趋于稳定,标志着系统挂膜成功。

Experimental Study of Biofilm Formation in Anaerobic-Aerobic Reactor for Flotation Wastewater

Beneficiation reagents exist in a great variety, with high toxicity and complex material structure, and it is difficult to be used by microorganisms quickly and efficiently. They can stay for a long time after they go into the environment. It is difficult to guarantee the organic flotation reagents in the water to discharge down into standard values and to be steady for a long time by physical and chemical methods. So, it is imperative to recycle the beneficiation wastewater and to achieve the drainage standard by biological methods. The Anaerobic-Aerobic reactor starts by using the method of gradually increasing the floating agent concentration and fixing the hydraulic retention time. The treatment efficiencies of COD and floating agent and the changes of biofacies are analyzed. The results show that during the biofilm formation and the domestication, the removal rate of COD is mainly concentrated in the aerobic reactor. Anaerobic reactor has also a certain removal effect, but far below that of an aerobic reactor. 40 days after a reactor starts, the total removal rate of COD is stable at a level of 55% and the total removal rates of aniline aerofloat, diethyldithiocarbamate and butyl xanthate reach 92%, 84% and 82%, the biofacies are steady and the biofilm is formed successfully.