高砷污酸处理技术的改进

Improvement of the Technique to the Process of High-arsenic Waste Acide

为了解决一步铅炼生产过程中排放的具有色度大,酸度高,含砷等有害物质的污酸废水问题,在原工艺的基础上加以改进,设计了一套新的处理工艺,即硫化沉淀-强化吸附协同处理方法.分别在硫化反应阶段、一段生物反应和二段生物反应阶段加入定量的絮凝剂PMA和聚合硫酸铁,发现改进后的工艺大大的减少了硫化钠的用量,提高了除砷的效率,使排放水中的含砷量小于0.5 mg/L,同时重金属离子和pH值都达到国家排放标准,并降低了生产成本,为强酸废水、砷污染的控制和治理、提供一条经济可行的新途径.

In order to solve the problems of the waste acid wastewater generated in one step refining of lead as high chroma, high acidity and too much hamfful substances as arsenic, a new treatment was divised from the original process. It was named the Co - processing method of the sulfid precipitation and strengthened adsorption. Fixed amount of flocculant PMA and poly ferric sulfate were added to the vulcanization reaction stage, period bioreactor and sec bioreactor stage, respectively. It was found that the improved process could reduce the amount of the sodium sulfide greatly, increase the efficiency of arsenic removal, achieve the purpose of the amount of arsenic less than 0.5 mg/L in the discharge water. At the same time, heavy metal ions and the values of tire pH were in line with the national emission standards. The costs were cut down. Thus, an economical and feasible way was provided for the control and governance of the strong acid waste water and arsenic pollution.