热水解预处理对污泥酸化过程中挥发性脂肪酸产生及随后多羟基烷酸酯生产的影响。
Effect of thermal hydrolysis pretreatment on volatile fatty acids production in sludge acidification and subsequent polyhydroxyalkanoates production.
机构信息
State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
Beijing Drainage Group Co. Ltd (BDG), Beijing, China; Beijing Engineering Research Center (NO:BG0113), Beijing 100124, China.
出版信息
Bioresour Technol. 2019 May;279:92-100. doi: 10.1016/j.biortech.2019.01.077. Epub 2019 Jan 21.
The study compared the differences in VFAs production between raw sludge and thermal hydrolyzed sludge (TH-sludge) at different temperature (35 °C and 55 °C) in four semi-continuous acidification reactors. Optimal VFAs yield was obtained from TH-sludge at 35 °C (0.22 gVFA/gVS), 44.6% higher than raw sludge at 35 °C, since the advantage of TH-sludge in SCOD solubilization overcame its disadvantage of lower carbon biodegradability. Moreover, high temperature (55 °C) was proved to aid the acidification of raw sludge by 15.7% (in Y), but inhibit that of TH-sludge by 12.2%, mainly due to the suppressed microbial activities under heat. Microbial community analysis showed that TH-sludge had a larger proportion of acidogenic microbes than raw sludge, mainly attributing to the increase of Selenomonadales (37.3% vs. 3.7%); high temperature enriched thermophilic proteolytic microbes, Anaerobaculum and Coprothermobacter. Finally, optimal acidified liquid from TH-sludge at 35 °C was applied for PHAs production and achieved a competitive yield of 34.6% PHAs/DCW.
该研究在四个半连续酸化反应器中比较了不同温度（35°C 和 55°C）下原始污泥和热水解污泥（TH-污泥）在 VFAs 产量方面的差异。TH-污泥在 35°C 时（0.22 gVFA/gVS）获得了最佳的 VFAs 产量，比 35°C 时的原始污泥高 44.6%，因为 TH-污泥在 SCOD 溶解方面的优势克服了其碳生物降解性较低的劣势。此外，高温（55°C）被证明可以使原始污泥的酸化提高 15.7%（Y），但使 TH-污泥的酸化降低 12.2%，主要是由于热抑制了微生物的活性。微生物群落分析表明，TH-污泥中产酸菌的比例高于原始污泥，主要归因于 Selenomonadales 的增加（37.3%比 3.7%）；高温富集了嗜热蛋白水解微生物，如 Anaerobaculum 和 Coprothermobacter。最后，将 TH-污泥在 35°C 下最佳酸化得到的液体应用于 PHAs 生产，实现了具有竞争力的 34.6% PHAs/DCW 产量。
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