聚乙烯和页岩陶粒对污泥厌氧发酵产酸的影响

研究了两种廉价的常用填料聚乙烯（PE）和页岩陶粒（SC）对污泥厌氧发酵产酸的影响.结果表明，PE和SC的加入促进了污泥颗粒的分解和溶胞，总短链脂肪酸（TSCFAs）的浓度分别是对照组的1.2和1.1倍.PE和SC组挥发性固体（VS）的降解率（29.7%和29.1%）高于对照组（24.9%），这是造成两组高SCFAs浓度维持较长时间的主要原因.高通量测序结果表明，PE和SC的加入使合成SCFAs的变形菌门（Proteobacteria）的相对丰度增加，而利用SCFAs的厚壁菌门（Firmicutes）和拟杆菌门（Bacteroidetes）的相对丰度则减少，说明合适的填料促进SCFAs产生的方式可能与产酸微生物种类的富集有关.

Effects of polyethylene and shale ceramsite on SCFAs production in anaerobic sludge fermentation

The effects of two types of media, namely polyethylene (PE) and shale ceramsite (SC), on sludge anaerobic fermentation to produce SCFAs production were investigated in this study. The results showed that the addition of PE and SC both promoted sludge disintegration and solubilization. The total SCFAs concentrations in PE and SC systems were 1.2 and 1.1 times of that of the control test, respectively. The VS degradation rates of the PE and SC tests were 29.7% and 29.1%, both of which were higher than that of the control test (24.9%). Higher VS degradation was the main reason for the longer duration of a higher SCFAs concentration in the tests with biocarriers. Both exhibited better performance than the control. High-throughput sequencing results showed that the addition of PE and SC increased the relative abundance of Proteobacteria, which can degrade organic compounds to SCFAs. And the relative abundance of Firmicutes and Bacteroidetes which utilize SCFAs decreased, indicating that the enhanced SCFAs production by the biocarriers were related to the enrichment of acid-producing bacterial.