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首页> 外文期刊>Environmental Science & Technology >Efficient Polyhydroxyalkanoates Production from a Waste-Activated Sludge Alkaline Fermentation Liquid by Activated Sludge Submitted to the Aerobic Feeding and Discharge Process
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Efficient Polyhydroxyalkanoates Production from a Waste-Activated Sludge Alkaline Fermentation Liquid by Activated Sludge Submitted to the Aerobic Feeding and Discharge Process

机译：废水污泥碱性发酵液中活性污泥进料和排放过程产生的高效多羟基链烷酸酯

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摘要

It was reported in our previous publication thatthe accumulation of short-chain fatty acids (SCFA) was significantly enhanced when waste-activated sludge (WAS) was anaerobically fermented at pH 10.0 (Yuan, et al., Environ. Sci. Technol. 2006, 40, 2025-2029). In this paper, the production of polyhydroxyalkanoate (PHA) by activated sludge with an aerobic feeding and discharge (AFD) process was investigated by the use of WAS alkaline fermentation liquid as the carbon source. It was observed that compared with other PHA synthesis processes reported in the literature, the AFD process showed the highest PHA production. The PHA content in sludge reached 72.9% when activated sludge was submitted to the AFD process. This was the highest PHA content obtained so far by activated sludge using wastes as the renewable carbon source. Although nitrogen and phosphorus were released into the WAS alkaline fermentation liquid, their presence did not affect PHA synthesis, which indicates that it is unnecessary to remove the released nitrogen and phosphorus, and the fermentation liquid can be used directly for PHA production. The accumulated PHA was mainly composed of 3- hydroxybutyrate (3HB) (73.5 mmol C%), 3-hydroxyvalerate (3HV) (24.3 mmol C%), and 3-hydroxy-2-methylvalerate (3H2MV) (2.2 mmol C%). Further investigation showed that SCFA rather than protein and carbohydrate in the alkaline fermentation liquid made the main contribution to PHA production. The PHA produced from WAS alkaline fermentation liquid had a molecular weight of 8.5 × 10~5 Da and a melting point of 101.4 ℃. Analysis using the 16S rRNA gene clone library revealed that γ-Pwteobacteria, α-Proteobacteria, and β-Proteobacteria were the dominant microorganisms in the PHA production system.
机译：在我们以前的出版物中曾报道，当在pH 10.0下厌氧发酵废料活化污泥（WAS）时，短链脂肪酸（SCFA）的积累会显着增加（Yuan等，Environ。Sci。Technol。2006， 40，2025-2029）。本文以WAS碱性发酵液为碳源，研究了好氧进出水（AFD）法处理活性污泥制备聚羟基链烷酸酯（PHA）。据观察，与文献报道的其他PHA合成方法相比，AFD方法显示出最高的PHA产量。当活性污泥进入AFD工艺后，污泥中的PHA含量达到72.9％。这是迄今为止使用废物作为可再生碳源的活性污泥获得的最高PHA含量。尽管氮和磷被释放到WAS碱性发酵液中，但是它们的存在并不影响PHA的合成，这表明无需去除释放的氮和磷，并且发酵液可直接用于PHA生产。积累的PHA主要由3-羟基丁酸酯（3HB）（73.5 mmol C％），3-羟基戊酸酯（3HV）（24.3 mmol C％）和3-羟基-2-甲基戊酸酯（3H2MV）（2.2 mmol C％）组成。进一步的研究表明，碱性发酵液中的SCFA而非蛋白质和碳水化合物是PHA生产的主要贡献。由WAS碱性发酵液生产的PHA分子量为8.5×10〜5 Da，熔点为101.4℃。使用16S rRNA基因克隆文库进行的分析表明，γ-Pwteobacteria，α-Proteobacteria和β-Proteobacteria是PHA生产系统中的主要微生物。

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  • 来源
    《Environmental Science & Technology》 |2009年第20期|7734-7741|共8页
  • 作者

    YAMIN JIANG; YINGUANG CHEN; XIONG ZHENG;

  • 作者单位

    State Key Iaboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Iaboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Iaboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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