Chronic Effects of Benzalkonium Chlorides on Short Chain Fatty Acids and Methane Production in Semi-Continuous Anaerobic Digestion of Waste Activated Sludge
| Autor: | Chun-Xue Yang, Zhang-Wei He, Wen-Zong Liu, Ai-Jie Wang, Ling Wang, Jia Liu, Bao-Ling Liu, Nan-Qi Ren, Shao-Peng Yu, Ze-Chong Guo |
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| Rok vydání: | 2022 |
| Předmět: |
History
Environmental Engineering Sewage Polymers and Plastics Fatty Acids Volatile Pollution Industrial and Manufacturing Engineering Ligases Phosphate Acetyltransferase Bioreactors Acetyl Coenzyme A Fermentation Environmental Chemistry Environmental Pollutants Anaerobiosis Acetyl-CoA C-Acetyltransferase Propionates Business and International Management Benzalkonium Compounds Waste Management and Disposal Methane |
| Zdroj: | SSRN Electronic Journal. |
| ISSN: | 1556-5068 |
| Popis: | As an emerging pollutant, benzalkonium chlorides (BACs) potentially enriched in waste activated sludge (WAS). However, the microbial response mechanism under chronic effects of BACs on acidogenesis and methanogenesis in anaerobic digestion (AD) has not been clearly disclosed. This study investigated the AD (by-)products and microbial evolution under low to high BACs concentrations from bioreactor startup to steady running. It was found that BACs can lead to an increase of WAS hydrolysis and fermentation, but a disturbance to acidogenic bacteria also occurred at low BACs concentration. A noticeable inhibition to methanogenesis occurred when BAC concentration was up to 15 mg/g TSS. Metagenomic analysis revealed the key genes involved in acetic acid (HAc) biosynthesis (i.e. phosphate acetyltransferase, PTA), β-oxidation pathway (acetyl-CoA C-acetyltransferase) and propionic acid (HPr) conversion was slightly promoted compared with control. Furthermore, BACs inhibited the acetotrophic methanogenesis (i.e. acetyl-CoA synthetase), especially BAC concentration was up to 15 mg/g TSS, thereby enhanced short chain fatty acids (SCFAs) accumulation. Overall, chronic stimulation of functional microorganisms with increasing concentrations of BACs impact WAS fermentation. |
| Databáze: | OpenAIRE |
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