污泥回流分离工艺(RSSP)除磷脱氮试验研究

Research on phosphorus and nitrogen removal of an urban wastewater by return sludge separate process

介绍了一种新型的脱氮除磷工艺——回流污泥分离工艺（return sludge separate process）,及其运行情况。该工艺在传统的厌氧-缺氧-好氧（A2/O）的模式下,针对硝酸盐对厌氧释磷的抑制问题进行改进,提出回流污泥的气浮浓缩分离方案,以提高系统的脱氮除磷效果。研究结果表明,在进水COD为250-400 mg/L,NH4＋-N为30-45 mg/L,PO43--P为8-10 mg/L左右时,该工艺对NH4＋-N和PO43--P的去除率分别可达79.3%和95%。该系统与A2/O的平行比较数据表明,该系统能够提高氮磷综合处理效率,解决A2/O处理工艺中存在无效释磷和硝酸根抑制问题。

The research emphasized on the process paramenters of a new phosphorus and nitrogen removal process named return sludge separate process（ RSSP）. It was fed with municipal wastewater under anaerobic-anoxic-aerobie stages conditions. In order to solve the problem of nitrate inhibition on phosphate release in anaerobic stage, RSSP added an air floatation sludge thickening system in its sludge return stage. The results showed that under the conditions of influent COD of 250 - 400 mg/L, NH4^＋ -N of 30 - 45 rag/L, and PO4^3- -P of 8 - 10 mg/L,the removal rates of NH4^＋ -N and PO4^3- -P in RSSP were 79.3% and 95% respectively. Compared with traditional A2/O process, RSSP had better performance on phosphorus and nitrogen removal. It could solve the problems of void phosphorus release and inhibition on phosphorus release in anaerobic stage of nitrate exposure.