KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Sludge reduction induced by adenosine triphosphate yield in electron transport pathways with different terminal electron acceptors | |
Yan, Peng1 ; Guo, Jinsong1,2; Xu, Yufeng3; Chen, Youpeng1; Fang, Fang1; Yang, Jixiang2
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| 2019 | |
| 摘要 | Existing sludge reduction technologies go against sustainable wastewater treatment because these technologies themselves involve energy inputs and chemicals consumption. Bacterial yield depends on adenosine triphosphate (ATP) synthesis in metabolism. The sludge minimization induced by ATP yield with different terminal electron acceptors was investigated to reduce energy and chemicals consumption in activated sludge process with low dissolved oxygen (LDO). The results indicated that anoxic bacteria accounted for 29.7% of the total microorganisms under LDO conditions. Anoxic bacteria utilized NOx- as electron acceptor instead of O2 obtaining a lower ATP yield due to the energy transfer efficiency of NOx- was only 2/3 of that associated with O2 during electron transport. 8.0% of extracellular protein as electron carriers participated in the electron transport process of bacteria in the LDO system; however, only 2.9% of them presented in the conventional activated sludge system. The abundance of catalytic activity proteins involving biological oxidation-reduction in the LDO system sample was twice as much as that of the control system sample. LDO level stimulated the energy metabolism of bacteria by enhancing ATP synthesis, electron transport chain activity, and dehydrogenase activity. More energy was dissipated when NOx- replaced O2 as electron acceptor, and then fewer cells were generated. Sludge reduction of the LDO system reached 15.4%. Sludge reduction induced by the different electron acceptors was successfully achieved based on bacterial energetics without extra energy and chemicals inputs. © 2019, Science Press. All right reserved. |
| DOI | 10.1360/N092018-00414 |
| 发表期刊 | Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica
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| ISSN | 16747259 |
| 卷号 | 49期号:8页码:947-960 |
| 收录类别 | EI |
| 语种 | 中文 |
| EISSN | 2095946X |
