复合生物膜-活性污泥反应器同步脱氮除磷

Simultaneous nitrogen and phosphorous removal in an integrated fixed biofilm-activated sludge biological reactor

通过实验研究比较了复合生物膜-活性污泥反应器(HY)和传统活性污泥反应器(AS)的脱氮除磷效果。结果表明,在水力停留时间(HRT)16 h、污泥龄12～15 d、水温19～21℃、pH 6.3～7.8的条件下,复合生物反应器比活性污泥反应器运行更稳定,未发生污泥膨胀。在相同运行条件下,复合生物反应器对COD、TN和TP的去除率分别为95%、91%和98%,而活性污泥反应器对COD、TN和TP的去除率分别为85%、84%和90%。稳定工况下复合生物反应器的比硝化、比反硝化速率,比吸磷、比释磷速率均高于活性污泥反应器,且微生物相更加丰富。通过建立16S rDNA克隆文库发现生物膜和活性污泥的微生物群落结构均具有高度多样性,但生物膜微生物的微生物相比活性污泥更复杂。

In this study,the nitrogen and phosphorus removal performance of the integrated fixed biofilm-activated sludge biological reactor（the hybrid biological reactor,HY） and the conventional activated sludge reactor（AS） were compared by lab-scale tests.The results indicated that the HY system achieved a more stable operational performance in comparison to the AS system when the hydraulic retention time（HRT）,sludge retention time（SRT）,temperature and pH value of the two system were kept at 16 hours,12~15 days,25~30℃ and 6.3~7.5,respectively.In addition,the sludge filamentation bulking of the HY system was not witnessed throughout the experiments.Based on the same operation strategy,the chemical oxygen demand（COD）,total nitrogen（TN） and total phosphorus（TP） removal rates from municipal wastewater by HY system reached at 95%,91% and 98%,respectively.In contrast,these parameters decreased to 85%,84% and 90% of AS system.It was demonstrated that the HY system achieved a better nitrogen and phosphorus elimination performance than the AS system in terms of specific nitrification rate,specific denitrification rate and specific phosphorus absorbing-releasing rate,respectively.Additionally,the HY system showed a wider range of microbial diversity of the flocs by means of SEM observation.The results of the construction of a 16S rDNA clone library indicated that the bacterial communities either in the biofilm or in the activated sludge were highly diverse by the construction of a 16S rDNA clone library,and these in the biofilm showed more complex.