基质配比及硫酸盐对AnMBR产甲烷性能的影响

发布时间：2018-05-15 08:12

本文选题：厌氧膜生物反应器 + 乙酸/丙酸　；参考：《中国环境科学》2017年03期

【摘要】：针对厌氧膜生物反应器污泥,研究了不同基质及硫酸盐对厌氧污泥产甲烷活性(SMA)及产甲烷潜能(BMP)的影响,阐述了硫酸盐还原及产甲烷过程的作用机制.结果表明:乙酸/丙酸比值为60%时,乙酸与丙酸的协同作用最佳,其厌氧污泥的SMA最快;乙酸/丙酸比值低于40%时,丙酸转化为乙酸的速率成为甲烷生成的限制因素,其厌氧污泥的SMA减缓;乙酸/丙酸比值高于60%时,SMA受到乙酸的抑制.在硫酸盐存在条件下,当COD/SO_4~(2-)-S20时,SMA和BMP均受到抑制,当COD/SO_4~(2-)-S10时,乙酸代谢受到抑制.从硫代谢情况来看,当COD/SO_4~(2-)-S25时,80%以上的硫酸盐转化为稳定价态的硫(H_2S,HS~-,S~(2-)),硫化氢对产甲烷菌产生抑制作用;当COD/SO_4~(2-)-S25时,仅有14%的硫酸盐转化为稳定价态的硫,硫酸盐还原菌因底物不足而活性受到抑制.
[Abstract]:The effects of different substrates and sulphates on methanogenic activity (SMAs) and methanogenic potential (BMPs) of anaerobic membrane bioreactor sludge were studied. The mechanism of sulfate reduction and methanogenesis was discussed. The results showed that when the ratio of acetic acid / propionic acid was 60, the synergistic effect of acetic acid and propionic acid was the best, the SMA of anaerobic sludge was the fastest, and when the ratio of acetic acid / propionic acid was lower than 40, the rate of conversion of propionic acid to acetic acid became the limiting factor of methane formation. When the ratio of acetic acid / propionic acid was higher than 60, the SMA of anaerobic sludge was inhibited by acetic acid. In the presence of sulfate, both SMA and BMP were inhibited at COD/SO_4~(2-)-S20 and acetic acid metabolism was inhibited at COD/SO_4~(2-)-S10. From the point of view of sulfur metabolism, when COD/SO_4~(2-)-S25, more than 80% of sulphate is converted into stable sulfur, H2SH, H2S-1, H2, and hydrogen sulfide has inhibitory effect on methanogenic bacteria, while in COD/SO_4~(2-)-S25, only 14% of sulphate is converted to stable valence sulfur, and when COD/SO_4~(2-)-S25, only 14% of sulphate is converted to sulfur in stable valence, while in COD/SO_4~(2-)-S25, more than 80% sulfate is transformed into sulfur with stable valence, and hydrogen sulfide can inhibit methanogenic bacteria. The activity of sulfate-reducing bacteria was inhibited by the lack of substrate.
【作者单位】：同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;
【基金】：上海市科委课题(14QA1403800)
【分类号】：X703

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