低高径比对好氧颗粒污泥颗粒化及其稳定性的影响
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摘要
序批式反应器(SBR)的结构在好氧污泥颗粒化及其稳定性和污染物代谢中起重要作用。反应器的高径比(H/D)将直接影响水力条件。实验通过研究SBR反应器的不同低H/D(5.0:1,2.5:1,1.5:1)时,好氧污泥颗粒化所需时间,并分析H/D对好氧颗粒稳定性和微生物代谢的影响机制。结果表明,在H/D为5.0和2.5的反应器中,可以培养出结构密实、沉降能力良好的好氧颗粒,平均粒径都均为1.40 mm。而H/D为1.5的反应器中的污泥颗粒结构松散,粒径稍大,其平均粒度为2.04 mm。3个反应器对有机物均有良好的去除功效(均大于90%),但H/D为5.0和2.5的反应器内的好氧颗粒对氮、磷具有更好的去除功效。分析认为,H/D为5.0和2.5的反应器内部,扩散系数更大(分别为76.6和37.7);从而形成更好的水力条件,以提供更好的传质和混合环境,有效促进AGS的形成及其微生物的代谢。
The configuration of a sequencing batch reactor(SBR) plays a significant role in the aggregation of the microbes, the formation and the stability of the granules. The height-to-diameter ratio(H/D) of the reactor will affect the hydraulic conditions. This study aimed to shorten the time required for aerobic sludge granulation in SBRs with different low H/D ratios(5.0:1, 2.5:1, 1.5:1) and elucidate the mechanisms underlying the effects of H/D ratios on the formation and metabolism of aerobic granular sludge(AGS). The results showed that granules of compact structure and excellent settling capacity were cultivated in reactors with H/D ratios of 5.0 and 2.5. Their average particle size was the same at 1.40 mm. In comparison, the average particle size of granules in a reactor with an H/D ratio of 1.5 were 2.04 mm. The three reactors had good removal efficiency for organic compounds(all over 90%), but the former two reactors with H/D ratio of 5.0 and 2.5 had better removal efficiency for nitrogen and phosphorus. The liquid diffusion coefficients of the reactors with H/D ratios of 5.0 and 2.5 were 76.6 and 37.7, respectively. The analysis showed that the diffusion coefficients of the reactor with H/D ratio of 5.0 and 2.5 are higher(76.6 and 37.7, respectively), thus forming better hydraulic conditions to provide better mass transfer and mixing environment, effectively promoting the formation of AGS and its microbial metabolism.
The configuration of a sequencing batch reactor(SBR) plays a significant role in the aggregation of the microbes, the formation and the stability of the granules. The height-to-diameter ratio(H/D) of the reactor will affect the hydraulic conditions. This study aimed to shorten the time required for aerobic sludge granulation in SBRs with different low H/D ratios(5.0:1, 2.5:1, 1.5:1) and elucidate the mechanisms underlying the effects of H/D ratios on the formation and metabolism of aerobic granular sludge(AGS). The results showed that granules of compact structure and excellent settling capacity were cultivated in reactors with H/D ratios of 5.0 and 2.5. Their average particle size was the same at 1.40 mm. In comparison, the average particle size of granules in a reactor with an H/D ratio of 1.5 were 2.04 mm. The three reactors had good removal efficiency for organic compounds(all over 90%), but the former two reactors with H/D ratio of 5.0 and 2.5 had better removal efficiency for nitrogen and phosphorus. The liquid diffusion coefficients of the reactors with H/D ratios of 5.0 and 2.5 were 76.6 and 37.7, respectively. The analysis showed that the diffusion coefficients of the reactor with H/D ratio of 5.0 and 2.5 are higher(76.6 and 37.7, respectively), thus forming better hydraulic conditions to provide better mass transfer and mixing environment, effectively promoting the formation of AGS and its microbial metabolism.
引文
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[6]罗小娟.不同水力条件对CANON颗粒污泥微生物胞外聚合物的影响[J].环境科技,2017,30(2):17-22.
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[8]ZHANG Q,HU J,LEE D J.Aerobic granular processes:current research trends[J].Bioresource technology,2016,210(1):74-80.
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[10]国家环境保护局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002:258-280
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[12]LI Z J,SHUKLA V,WENGER K S,et al.Effects of increased impeller power in a production-scale aspergillus oryzae fermentation[J].Biotechnology progress.2002,18(3):437-444.
[2]ZHENG X,LU D,CHEN W,et al.Response of aerobic granular sludge to the long-term presence of Cu O NPs in A/O/A SBRs:nitrogen and phosphorus removal,enzymatic activity,and the microbial community[J].Environmental science&technology,2017,51(18):10 503-10 510.
[3]PRONK M,DE KREUK M K,DE BRUIN B,et al.Full scale performance of the aerobic granular sludge process for sewage treatment[J].Water research,2015,84:207-217.
[4]Zh ANG Q,HU J,LEE D.Aerobic granular processes:current research trends[J].Bioresource technology,2016,210(SI):74-80.
[5]龙焙,杨昌柱,濮文虹,等.SFBR中好氧颗粒污泥的培养及特性研究[J].环境科学,2014(5):1 857-1 865.
[6]罗小娟.不同水力条件对CANON颗粒污泥微生物胞外聚合物的影响[J].环境科技,2017,30(2):17-22.
[7]SEVIOUR T,PIJUAN M,NICHOLSON T,et al.Gel-forming exopolysaccharides explain basic differences between structures of aerobic sludge granules and floccular sludges[J].Water research,2009,43(18):4 469-4 478.
[8]ZHANG Q,HU J,LEE D J.Aerobic granular processes:current research trends[J].Bioresource technology,2016,210(1):74-80.
[9]LONG B,YANG C Z,PU W H,et al.Tolerance to organic loading rate by aerobic granular sludge in a cyclic aerobic granular reator[J].Bioresource technology,2015,182:314-322.
[10]国家环境保护局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002:258-280
[11]DOSHI Y K,PANDIT A B.Effect of internals and sparger design on mixing behavior in sectionalized bubble column[J].Chemical engineering journal,2005,112(1/3):117-129.
[12]LI Z J,SHUKLA V,WENGER K S,et al.Effects of increased impeller power in a production-scale aspergillus oryzae fermentation[J].Biotechnology progress.2002,18(3):437-444.
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