Mechanism of powdered activated carbon enhancing caproate production  

作　　者：Siying Xiang Qinglian Wu Weitong Ren Wanqian Guo Nanqi Ren 

机构地区：[1]College of Architecture and Environment,Sichuan University,Chengdu 610065,China [2]State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Chinese Chemical Letters》2023年第4期415-419,共5页中国化学快报（英文版）

基　　金：supported by the Natural Science Foundation of Sichuan Province (No. 2022NSFSC1042);Fundamental Research Funds for the Central Universities;National Natural Science Foundation of China (No. 52000132);supported by the Sichuan Province College Students’ Innovation and Entrepreneurship Training Plan (No. S202210610415)。

摘　　要：Caproate, produced by microbial chain elongation process, is potential to replace the diversified fossilbased products, contributing to carbon neutrality. However, its production performance is far from industrial application, so the cost-effective enhancement measures are highly needed. This study confirmed powdered activated carbon(PAC) has a significant effect on enhancing caproate production performance.The production, yield, and selectivity of caproate were improved by more than 1-fold by the optimized PAC dosage of 15 g/L, comparing with control. Mechanism investigation from a new visual angle showed that PAC accelerated ethanol oxidation to generate acetyl-Co A, and simultaneously boosted the efficiency of reverse β oxidation(RBO) by promoting the timely reaction of butyrate and acetyl-Co A to synthesis caproate. The addition of PAC also shifted the microbial community by enriching more caproateproducing bacteria but eliminating irrelevant ones. Furthermore, metagenomic analysis revealed that PAC effectively up-regulated the functional genes encoding key enzymes responsible for ethanol oxidation and RBO pathway, which was the root cause for the improved caproate production. This study presented the intrinsic insights into the mechanism of PAC promoting caproate generation, laying a foundation to the scale production of caproate.

关 键 词：Medium chain fatty acids Caproate Powdered activated carbon Functional genes METAGENOME 

分 类 号：TQ225.21[化学工程—有机化工]