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Different micro-aeration rates facilitate production of different end-products from source-diverted blackwater.
Water Research ( IF 12.8 ) Pub Date : 2020-04-04 , DOI: 10.1016/j.watres.2020.115783
Najiaowa Yu 1 , Bing Guo 1 , Yingdi Zhang 1 , Lei Zhang 1 , Yun Zhou 1 , Yang Liu 1
Affiliation  

The effects of micro-aeration on the performance of anaerobic sequencing batch reactors (ASBR) for blackwater treatment were investigated in this study. Different micro-aeration rates, 0, 5, 10, 50, and 150 mg O2/L-reactor/cycle, and their effect on the hydrolysis, acidogenesis, and methanogenesis of blackwater were evaluated and compared at ambient temperature. Source-diverted blackwater (toilet water) contains high organic contents which can be recovered as biogas. Previous studies have found that anaerobic digestion of blackwater without micro-aeration can only recover upwards of less than 40% of chemical oxygen demand (COD) to methane at room temperature due to the low hydrolysis rate of biomass content in blackwater. This study achieved increases in blackwater hydrolysis (from 34.7% to 48.7%) and methane production (from 39.6% to 50.7%) with controlled micro-aeration (5 mg O2/L-reactor/cycle). The microbial analysis results showed that hydrolytic/fermentative bacteria and acetoclastic methanogens (e.g. Methanosaeta) were in higher abundances in low-dose micro-aeration reactors (5 and 10 mg O2/L-reactor/cycle), which facilitated syntrophic interactions between microorganisms. The relative abundance of oxygen-tolerant methanogen such as Methanosarcina greatly increased (from 1.5% to 11.4%) after oxygen injection. High oxygen dosages (50 and 150 mg O2/L-reactor/cycle) led to reduced methane production and higher accumulation of volatile fatty acids, largely due to the oxygen inhibition on methanogens and degradation of organic matters by aerobic growth and respiration, as indicated by the predicted metagenome functions. By combining reactor performance results and microbial community analyses, this study demonstrated that low-dose micro-aeration improves blackwater biomethane recovery by enhancing hydrolysis efficiency and promoting the development of a functional microbial population, while medium to high-dose micro-aeration reduced the activities of certain anaerobes. It was also observed that medium-dose micro-aeration maximizes VFA accumulation, which may be used in two-stage anaerobic digesters.

中文翻译:

不同的微曝气速率有助于从源改道的黑水生产不同的最终产品。

在本研究中,研究了微曝气对厌氧排序批处理反应器(ASBR)用于黑水处理的性能的影响。在环境温度下评估和比较了不同的微曝气速率(0、5、10、50和150 mg O2 / L反应器/循环)及其对黑水水解,产酸和产甲烷的影响。源头转移的黑水(厕所水)中有机物含量高,可以作为沼气回收。以前的研究发现,由于黑水中生物质含量的水解率低,在不进行微曝气的情况下,黑水的厌氧消化只能将低于40%的化学需氧量(COD)回收至甲烷。这项研究实现了黑水水解(从34.7%增加到48.7%)和甲烷产量(从39.6%增加到50)的增加。7%)和受控的微曝气(5 mg O2 / L反应器/循环)。微生物分析结果表明,在低剂量微曝气反应器(5和10 mg O2 / L反应器/循环)中,水解/发酵细菌和乙酰破伤性产甲烷菌(例如甲烷甲烷藻)的丰度更高,这促进了微生物之间的共养作用。氧气注入后,耐氧性产甲烷菌如甲烷八叠球菌的相对丰度大大提高(从1.5%增至11.4%)。较高的氧气剂量(50和150 mg O2 / L反应器/循环)导致甲烷生成减少和挥发性脂肪酸更高的积累,这主要是由于氧气对产甲烷菌的抑制作用以及有氧生长和呼吸作用导致有机物的降解,如所示通过预测的基因组功能。通过将反应堆性能结果和微生物群落分析相结合,该研究表明低剂量微曝气通过提高水解效率和促进功能性微生物种群的发展来改善黑水生物甲烷的回收,而中到高剂量微曝气则降低了活性某些厌氧菌。还观察到中等剂量的微曝气使VFA积累最大化,可用于两阶段厌氧消化池。
更新日期:2020-04-06
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