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Bacterial community compositions of propylene oxide saponification wastewater treatment plants

机译：环氧丙烷皂化废水处理厂的细菌群落组成

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The activated sludge process has been successfully used to treat propylene oxide (PO) saponification wastewater, which has the characteristics of high chlorine contents (22?000–26?000 mg L?1) and high COD (more than 2000 mg L?1). Microorganisms, especially bacteria, play an important role in PO saponification wastewater treatment processes. Analysis of the bacterial composition of the aeration tank and contact oxidation tank, the two main components of PO saponification wastewater treatment plants (SWWTP), revealed their significant community difference in municipal and coking wastewater treatment plants. Interestingly, β-Proteobacteria was almost absent in the PO SWWTP, which was usually abundant in various bio-treatment systems. In the aeration tank of PO SWWTP, the most abundant genera were Marinobacter, Mesorhizobium, Paracoccus, Devosia, Methylophaga and KSA1. In the contact oxidation tank of PO SWWTP, the most abundant genera were Thalassospira, Marinobacter, Owenweeksia, Novispirillum, Mesorhizobium, Sporotomaculum, Pseudidiomarina and KSA1. We also measured the total components and toxicity of PO saponification wastewater in order to establish correlations between bacterial stains, genes and their treatment capacity. The results indicated that most of the bacteria encoded the dehalogenase gene and played an important role in the dechlorinating process of chlorinated organics in the aeration tank. In contrast, most of the bacteria encode the alkJ gene in the contact oxidation tank, which was involved in the degradation of 2,4-dimethyl-2-pentanol or some dechlorinated intermediate products. This study would provide new insight into the microbial community compositions of PO SWWTPs.
机译：活性污泥法已成功用于处理环氧丙烷（PO）皂化废水，该废水具有较高的氯含量（22？000–26？000 mg L ？1 ）和高COD（超过2000 mg L ？1 ）。微生物，尤其是细菌，在PO皂化废水处理过程中发挥重要作用。对曝气池和接触氧化池（PO皂化废水处理厂（SWWTP）的两个主要组成部分）的细菌组成进行分析，发现它们在市政和焦化废水处理厂中具有显着的群落差异。有趣的是，PO SWWTP中几乎不存在β-ro> Proteobacteria ，通常在各种生物处理系统中都很丰富。在PO SWWTP的曝气池中，最丰富的属是 Marinobacter ， Mesorhizobium ， Paracoccus ， Devosia ，< em> Methylophaga 和 KSA1 。在PO SWWTP的接触氧化罐中，最丰富的属是 Thalassospira ， Marinobacter ， Owenweeksia ， Novispirillum ， 中生根瘤菌，孢子囊菌，假单胞菌和 KSA1 我们还测量了PO皂化废水的总成分和毒性，以建立细菌污渍，基因及其处理能力之间的相关性。结果表明，大多数细菌编码脱卤酶基因，并在曝气池中的有机氯的脱氯过程中起重要作用。相反，大多数细菌在接触氧化罐中编码 alkJ 基因，该基因参与了2,4-二甲基-2-戊醇或某些脱氯中间产物的降解。这项研究将为PO SWWTPs的微生物群落组成提供新的见解。

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