生物吸附/MBR/硫铁自养反硝化组合工艺优化研究

为了实现深度脱氮除磷效果，利用生物吸附/MBR/硫铁自养反硝化组合工艺进行优化研究，考察了不同HRT和硫铁体积比对系统脱氮除磷的影响.结果表明，MBR池和硫铁自养反硝化滤池的HRT分别在9h和3h条件下，污染物去除效果最佳，63%的COD在生物吸附段被去除，工艺系统平均出水COD、NH₄⁺-N、NO₃^--N、TN浓度分别为18.9，0.36，0，3.3mg/L，实现了污染物的超低排放.硫铁反硝化滤池的硫铁体积比为3：1条件下，出水TP平均浓度为0.29mg/L；其中大部分NO₃^--N在滤池高度10~30cm处被去除，脱氮速率约为46.1gNO₃^--N/（m³·h）.同时组合工艺在运行期间，采用间歇抽吸方式和较高曝气量能有效减缓膜污染进程.

Research on optimal operation by a combined biological adsorption-MBR-Sulfur/Iron autotrophic denitrification process

In order to realize the effect of deep nitrogen and phosphorus removal, a combined biological adsorption-MBR-sulfur/iron autotrophic denitrification process was optimized, and the influence of HRT and volume ratio of sulfur-iron to nitrogen and phosphorus removal were both investigated. The experimental results showed that the optimal contaminants removal performance was achieved when the respective HRT of MBR and sulfur/iron autotrophic denitrification filter was 9h and 3h, and 63% of COD was adsorbed by biological adsorption process. The average effluent COD, NH₄⁺-N, NO₃^--N and TN were 18.9, 0.36, 0 and 3.3mg/L, respectively, which was beneficial for deep nitrogen and phosphorus removal. In addition, the average effluent TP was as low as 0.29mg/L as the volume ratio of sulfur and iron was 3:1 in the sulfur/iron autotrophic denitrification filter. Most of nitrate was reduced in the region of 10 to 30cm height in the sulfur/iron autotrophic denitrification filter, and the corresponding nitrogen removal rate was 46.1gNO₃^--N/(m³×h). Furthermore, it was found that the membrane fouling could be effectively alleviated by providing intermittent suction to membrane module and high aeration rate to MBR process.