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首页> 外文期刊>Biochemical Engineering Journal >Anaerobic digestion using ultrasound as pretreatment approach: Changes in waste activated sludge, anaerobic digestion performances and digestive microbial populations
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Anaerobic digestion using ultrasound as pretreatment approach: Changes in waste activated sludge, anaerobic digestion performances and digestive microbial populations

机译：使用超声作为预处理方法的厌氧消化：废物活性污泥，厌氧消化性能和消化微生物种群的变化

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摘要

To solve the problem of slow hydrolysis rate during anaerobic digestion, 20 kHz of ultrasound and energy density of 0.5 W/mL were applied as pretreatments for mesophilic anaerobic digestion of waste activated sludge. The sludge was digested at hydraulic retention time (HRT) of 20 d after sonication of 0-100 min. Results showed that ultrasonic pretreatment was beneficial to the dissolution of soluble chemical oxygen demand (SCOD) from the waste activated sludge, coupled with the rapid degradation in the dewatering performance of the sludge. In the succeeding anaerobic digestion, when sonication of the treated sludge was more than 80 min, the removal rate of total chemical oxygen demand (TCOD) and the sludge reduction rate also decreased significantly. Gas and methane productions were highest at the reactor fed with sludge sonicated at 80 min. At this condition, the content of CH4 was more than 53.8%, and the average yield of methane was about 36.2 mL/gVS. Through the analysis of microbial diversity, we observed that hydrolytic and acidification bacteria were abundant in the reactors. Methanocorpusculum and Methanosaeta were the alternating dominant methanogens in the anaerobic reactors, with adding sludge suffered different ultrasonic time. In the sludge pretreated with ultrasonication after 80 min, the relative abundance of Methanocorpusculum decreased rapidly, and the dominant substrate for anaerobic methanogenesis changed from hydrogen to acetic acid. (C) 2017 Elsevier B.V. All rights reserved.
机译：为了解决厌氧消化过程中水解速率缓慢的问题，将20kHz的超声和能量密度为0.5W / mL作为嗜苯胺的厌氧消化废物活性污泥的预处理。在超声处理0-100分钟后，在20d的液压保留时间（HRT）下消化污泥。结果表明，超声波预处理有利于来自废物活性污泥的可溶性化学需氧量（SCOD）的溶解，与污泥的脱水性能的快速降解相结合。在继承的厌氧消化中，当经处理的污泥的超声处理超过80分钟时，总化学需氧量（TCOD）的去除率和污泥减少率也显着下降。在80分钟的反应器中加入污泥的反应器中，气体和甲烷制造最高。在这种情况下，CH 4的含量大于53.8％，甲烷的平均产率为约36.2ml / gV。通过对微生物多样性的分析，我们观察到水解和酸化细菌在反应器中丰富。 Methanocorpusculum和Methanosaeta是厌氧反应器中交替的显性甲烷，加入污泥遭受不同的超声波时间。在80分钟后用超声处理预处理的污泥中，甲烷容量的相对丰度迅速降低，并且对于厌氧甲烷发生的显性基材从氢气变为乙酸。 （c）2017 Elsevier B.v.保留所有权利。

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  • 来源
    《Biochemical Engineering Journal》 |2018年第2018期|共7页
  • 作者

    Li Xiyao; Guo Siyu; Peng Yongzhen; He Yuelan; Wang Shuying; Li Lukai; Zhao Mingming;

  • 作者单位

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

    Beijing Univ Technol Engn Res Ctr Beijing Natl Engn Lab Adv Municipal Wastewater Treatment Beijing 100124 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学技术;
  • 关键词

    Waste activated sludge; Anaerobic digestion pretreatment; Sludge treatment and disposal; Low frequency ultrasound;

    机译：废物活性污泥;厌氧消化预处理;污泥处理和处置;低频超声;

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