The process parameters of the up-flow biological activated carbon filter (UBACF) were optimized in a pilot-scale trial for controlling the precursor of dichloroacetonitrile (DCAN), an emerging nitrogenous disinfection by-product. The experiments were performed using a central composite design (CCD) with the response surface methodology (RSM). The results showed that the removal efficiencies of formation potentials (FP) of DCAN increased from 28.9% to 64.4% with the optimized ozone dose, expansion rate of BAC and backwashing cycle, being scheduled to 1.52 mg/L, 27% and 9.5 d, respectively. Excitation and emission matrix (EEM) spectra indicated that the fluorescence peaks of aromatic protein (AP) and soluble microbial products-like (SMPs)-like region were weakened significantly in the effluent of improved process (IP) with optimization, which were main precursors of DCAN. The bacterial community before and after the optimization of UBACF was determined using the high-throughput sequencing technology. The class and genus of microorganism demonstrated that the IP had a more diverse microbial community and more even distribution of species in BAC filter. It was favor of the growth of Alphaproteobacteria, Bacilli and Betaproteobacteria attached to the BAC particles, which could biodegrade effectively the precursors of DCAN.

中文翻译：

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优化上流式BAC过滤器中新兴的含氮消毒副产物二氯乙腈（DCAN）的前体去除

上流式生物活性炭滤池（UBACF）的工艺参数在中试规模的试验中进行了优化，以控制二氯乙腈（DCAN）（一种新兴的含氮消毒副产物）的前体。实验是使用中央复合设计（CCD）和响应表面方法（RSM）进行的。结果表明，在优化的臭氧剂量，BAC的膨胀率和反冲洗周期的条件下，DCAN的形成势（FP）的去除效率从28.9％提高到64.4％，排定为1.52 mg / L，27％和9.5 d，分别。激发和发射矩阵（EEM）光谱表明，经过优化的改进工艺（IP）的出水中，芳香蛋白（AP）和可溶性微生物产物样（SMPs）类区域的荧光峰显着减弱，这是DCAN的主要前身。使用高通量测序技术确定了UBACF优化前后的细菌群落。微生物的种类和种类表明，IP在BAC过滤器中具有更多样化的微生物群落和更均匀的物种分布。这是对...的增长的青睐附着在BAC颗粒上的Alteproteobacteria，Bacilli和Betaproteobacteria可以有效地生物降解DCAN的前体。