水解酸化+生化A/O工艺处理碎煤加压气化废水的试验研究

针对碎煤加压气化所产生的废水具有含酚高、氨氮高、可生化性差等特点,采用水解酸化+生化A/O组合工艺进行处理,考察了停留时间和回流比对处理效果的影响。结果表明:水解酸化池较合适的水力停留时间在22.7 h^35.7 h;生化A/O池的水力停留时间超过100 h时,COD的质量浓度可降到300 mg/L左右;生化A/O池的混合液回流比对总氮的去除率影响较大,且维持3倍左右的回流比时,可获得较好的总氮去除率。

Study on the Treatment of Crushed Coal Pressurized Gasification Wastewater by Hydrolysis Acidification and A/O Process

The wastewater produced by crushed coal pressurized gasification had the characteristics of high phenol content, high ammonium nitrogen content and poor biodegradability. The combined process of hydrolysis acidification and A/O was used to treat such wastewater, and the effect of retention time and reflux ratio on treatment was investigated. The results showed that the suitable hydraulic retention time of hydrolysis acidification tank was between 23 and 35 hours;when the hydraulic retention time of A/O tank was more than 100 hours, COD could be reduced to about 300 mg/L;the reflux ratio of mixed liquid of A/O tank had a great effect on total nitrogen removal. Maintaining around 3 times reflux ratio could obtain a better total nitrogen removal rate.