SBR反应器中反硝化条件下去除苯酚工艺

Phenol removal under denitrifying conditions in SBR bioreactor

基于异养反硝化原理,在序批式间歇反应器(SBR)中对反硝化同时降解苯酚的菌种进行了149d的驯化,驯化通过逐步提高进水中苯酚和NO3--N的浓度进行。驯化结束后,进水苯酚质量浓度达到360mg/L,葡萄糖质量浓度达到100mg/L,NO3--N质量浓度达到240mg/L,水力停留时间6h,苯酚和NO3--N去除率均大于98%。反应器运行结果表明:进水苯酚质量浓度低于720mg/L时,SBR反应器运行稳定;高浓度NO2--N(>60mg/L)可以严重影响微生物对苯酚以及NO3--N的去除能力,同时反应器中20.5%～23.5%的COD可被用于微生物的细胞合成。

Based on heterotrophic denitrification,simultaneous denitrification and phenol degradation has been developed in a sequencing batch reactor（SBR） for 149 d by increasing the concentrations of influent phenol and NO3^--N in step. At the end of domestication, concentrations of influent phenol, glucose and NO3^--N are 360 mg/L, 100 mg/L and 240 mg/L, respectively. When the reactor is operated at HRT 6h, above 98% of phenol and NO3^--N could be removed. It has been revealed that SBR could operate steadily even when phenol concentration is less than 720 mg/L. Highly concentrated NO2^--N has effect on the rejecting ability of phenol and NO3^--N,when its concentration is more than 60 mg/L. When SBR is operated steadily,20.5%- 23.5% of COD could be used for the proliferation of microorganism（biomass）.