含油污水可生化性及实验方法研究

Biodegradability of oily waste water and its experimental evaluation method

评价含油污水处理的可生化性有很多方法,最简单的方法是用生化需氧量(BOD5)和化学需氧量(CODcr)之间的关系简单评价。江苏油田含油污水中氯离子含量普遍较高,给COD测定带来一定的干扰。通过实验确定了一种可以替代国标法的高氯废水COD测定法,经过加标实验得知其平均加标回收率为96.8%,达到要求的95%～105%。该新方法准确可靠,缩短了实验时间,减少了对环境的污染,安全性也得到提高。评价了江苏油田15个污水处理站含油污水的可生化性,结果表明大部分污水站的可生化性较好,为江苏油田生化技术的应用提供了依据。

There are many ways to evaluate the biodegradability of oily waste water. The simplest way is to utilize the relationship between biochemical oxygen demand （ BOD5 ） and chemical oxygen demand （CODcr）. The content of chloride ion in Jiangsu Oilfield oily waste water is generally higher as a result bringing some interference for COD measurement. A new evaluation method, which can replace the national standard COD measurement method of waste water having high chlo- rine ion, is determined by many experiments. By the standard recovery experiments, an average recovery rate of standard samples is 96.8% ,which can meet the requirement of recovery rate from 95% to 105%. The new method,which is accu- rate and reliable, can shorten experiment time, reduce environment pollution, and improve the security. Biodegradabilities of oily waste water samples taken from 15 sewage treatment stations of Jiangsu Oilfield were evaluated. Results showed that most of these sewage treatment stations have good biodegradability, which provide a basis for the application of biochemical technology in Jiangsu Oilfield.