稳定塘用于石化废水尾水处理的中试研究

Application of Stabilization Pond to Treatment of Tail Water of Petrochemical Wastewater

分别构建了自然型和人工型2种稳定塘的中试系统,探索稳定塘用于石化废水尾水处理的效果以及人工强化措施对稳定塘功能的影响。结果表明,在地广人稀的西部地区选择适宜的场地建设稳定塘作为石化废水达标排放(或回用)前的防护性终端处理单元,具有兼顾进一步净化水质和调节性存贮的双重功效。自然型和人工型稳定塘具有各自不同的功能优势。自然型稳定塘对氮、磷的去除效果略优,对氨氮和TP的质量去除率分别为44%和75%;自然型稳定塘中叶绿素a浓度较高,有助于氨氮和TP的去除。人工型稳定塘则对有机污染物具有更优的去除效果,对COD的质量去除率为32%;增加曝气装置、设置导流墙、加入载体等人工强化措施有利于对有机污染物的去除。

Two kinds of natural and artificial stabilization ponds were established in a pilot-scale test to study the treatment efficiency of tail water of petrochemical wastewater and the effect of enhanced measures on artificial pond. The results show that it is an efficient technique to use stabilization pond as a protective terminal treatment unit before discharge or reuse of petrochemical wastewater, which can purify water further and also store water temporarily. Each type of the stabilization pond has its advantages. The natural pond has a better effect on the removal of nitrogen and phosphorus, and the mass removal rates of ammonia nitrogen and total phosphorus reach 44% and 75% respectively. The concentration of chlorophyll a is higher in the natural pond, which helps the removal of ammonia nitrogen and total phos- phorus. However, the artificial pond can remove more organic pollutants, and the mass removal rate of COD is 32%. The enhanced measures of aeration devices, guide walls and carriers are advantageous for removing organic pollutants.