DEHP降解菌对反硝化滤池启动和性能的影响

为研究DEHP降解菌对反硝化生物滤池启动和性能的影响,采用两座上向流反硝化生物滤池进行对比试验。两座反硝化生物滤池进水均投加120μg/L的DEHP,一座反硝化生物滤池(1~#滤池)按照1∶1000(V菌液∶V进水)仅在挂膜阶段投加DEHP降解菌菌液,另一座反硝化生物滤池(0~#滤池)不投加DEHP降解菌菌液作为空白对照。对比试验期间对反硝化生物滤池在1.5 m/h的滤速下运行,通过29 d的对比试验,结果发现,DEHP降解菌使反硝化生物滤池的挂膜时间由15 d变为9 d,加快了40%,稳定阶段0~#滤池和1~#滤池的COD去除率分别为90.45%和95.55%,硝氮去除率分别为69.35%和76.19%,DEHP降解菌提升了滤池对COD和硝氮的去除能力,但对出水亚氮的浓度无明显影响,出水亚氮浓度几乎为0。反硝化生物滤池对DEHP的去除也有明显的效果,0~#滤池和1~#滤池在稳定阶段的DEHP去除率分别为74.77%和86.66%,DEHP降解菌也提升了反硝化生物滤池对DEHP的去除率。另外,在反硝化滤池内部,COD、硝氮、DEHP的去除主要集中在进水端0~0.4 m内。0~#滤池的亚氮积累率随滤池的增高而降低,但1~#滤池的亚氮积累率随滤层高度的增加呈现先升高后降低的趋势。

Effects of di (2-ethylhexyl) Phthalate Degradation Bacteria on Denitrification Biological Filter Start-up and Performance

To sutdy the effects of di (2-ethylhexyl ) phthalate degradation bacteria on the start-up of denitrification bio-logical filter and performance ,two denitrification biological filter was operated in the experiment .Two denitrification biologi-cal aerated filters were cast with 120μg/L of DEHP ,in which one was added di (2-ethylhexyl) phthalate degradation bac-teria to 1∶1000 (Vbacteria:Vraw water ) and the other added no di (2 -ethylhexyl ) phthalate degradation bacteria as a blank control .By the control experiment during the 29 days ,the bio-filter which was added di (2-ethylhexyl ) phthalate degradation bacteria had been started-up in 9 days ,increased 40% by one added no di (2-ethylhexyl ) phthalate degrada-tion bacteria bio-filter .The removal rate of COD was 90 .45% and 95 .55% respectively ,that of NO3- -N was 69 .35% and 76 .19% respectively ,but the nitrite accumulation rate was almost 0 .The removal rate of DEHP by denitrification biological filter was also obviously increased and that of DEHP was 74 .77% and 86 .66% respectively .The removal rate of DEHP was also increased by the di (2-ethylhexyl) phthalate degradation bacteria .In addition ,the removal of COD ,NO3- -N and DEHP was mainly concentrated in the height of 0-0 .4 m .The nitrite accumulation rate of the one added no di (2-ethyl-hexyl ) phthalate degradation bacteria bio -filter decreased with the increase of filter bed height and the nitrite accumulation rate increased firstly ,and then decreased along with the increase of the bed height in the biofilter added di (2-ethylhexyl ) phthalate degradation bacteria .