Degradation kinetics of toilet paper fiber during wastewater treatment: Effects of solid retention time and microbial community
Degradation kinetics of toilet paper fiber during wastewater treatment: Effects of solid retention time and microbial community
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废水处理过程中卫生纸纤维的降解动力学：固体保留时间和微生物群落的影响
DOI：
10.1016/j.chemosphere.2019.03.097
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发表时间：
2019-06-01
期刊：
影响因子：
8.8
通讯作者：
Liu, Guoqiang
中科院分区：
文献类型：
--
作者：
Li, Simeng;Wu, Zhuangzhuang;Liu, Guoqiang
卫生纸纤维是城市污水中主要的缓慢生物降解成分。在污水处理厂（WWTPs）的初步处理过程中，它们通常不能被有效地去除，特别是对于那些没有安装初级澄清池的污水处理厂。虽然细目筛在去除纤维方面是有效的，但它们的应用在当前的污水处理厂中并不常见。因此，了解TP纤维在污水二级处理过程中的降解情况是至关重要的。在序批式活性污泥系统中，研究了固体停留时间（SRT）和微生物群落对TP水解动力学的影响。同时，还研究了葡萄糖等易生物降解有机物的添加对纤维降解的影响。结果表明，TP的总降解率随SRT线性增加。在40天的SRT，约83%的TP被降解。污泥龄40 d时的水解系数（0.116-0.137 d（-1））显著高于小于20 d时的水解系数（0.025-0.034 d（-1）），这可能是由于纤维素和半纤维素纤维的逐步水解以及污泥龄较大时微生物多样性增强所产生的协同酶活性所致。功能活跃的纤维降解纤维弧菌属被确定为纤维水解的主要驱动力。有趣的是，发现纤维降解微生物群落在消耗葡萄糖或乙酸盐方面效率低下。因此，添加这些底物并没有增强TP降解。(C)2019爱思唯尔有限公司版权所有。
Toilet paper (TP) fiber is a major slowly biodegradable constituent of municipal wastewater. Oftentimes, they cannot be efficiently removed during the preliminary treatment of wastewater treatment plants (WWTPs), especially for those without installation of primary clarifiers. Although fine-mesh sieves are effective in removing fibers, their applications are not common in current WWTPs. Therefore, it is critical to understand the degradation of TP fibers during the secondary wastewater treatment. In this study, the effects of solids retention time (SRT) and microbial community on the hydrolysis kinetics of TP were investigated in sequencing-batch activated sludge systems. Meanwhile, the influence of the addition of readily biodegradable organics such as glucose on fiber degradation was also studied. It was found that the overall degradation of TP linearly increased versus SRT. At 40-day SRT, approximately 83% of TP was degraded. The hydrolysis coefficient at 40-day SRT (0.116-0.137 d(-1)) significantly increased compared to those at SRTs smaller than 20 days (0.025-0.034 d(-1)), which was probably due to the stepwise hydrolysis of cellulose and hemicellulose fibers, as well as the synergistic enzymatic activities owing to the enhanced microbial diversity at larger SRTs. Actively functioning fiber-degrading Cellvibrio genus was identified as the dominant driver of fiber hydrolysis. Interestingly, it was discovered that fiber-degrading microbial communities were inefficient at consuming either glucose or acetate. Therefore, the addition of these substrates did not enhance TP degradation. (C) 2019 Elsevier Ltd. All rights reserved.