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江南,伏小勇,崔广宇,陈学民,黄魁.蚯蚓处理对污泥中微生物碳量及脱氢酶活性的影响[J].环境科学学报,2015,35(1):252-256

时间:2023-11-25

焦点提醒:伏小勇,崔广宇,陈学平易近,黄魁.蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响[J].情况科学学报,2015,35(1):252-256中国给水排水2023年中国污水处理厂提标改造(污水处理提质增效)高级研讨会(第七届)邀请函暨征稿启事中国给水排水2023年中国污水处理厂提标改造(污水处理提质增效)高级研讨会(第七届)邀请函暨征稿启事 伏小勇,崔广宇,陈学平易近,黄魁.蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响[J].情况科学学报,2015,35(1):252-256 蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响 Effects of earthwormson the microbial biomass carbon and dehydrogenase activity in decomposition treatment of sewage sludge 要害词:污泥蚯蚓微生物碳量脱氢酶活性 基金项目:国度天然科学基金(No.51168029);甘肃省科技支持打算项目(No.1104FKCA157)

  • 作者
  • 单元
  • 伏小勇
  • 兰州交通年夜学情况与市政项目学院, 兰州 730070
  • 崔广宇
  • 兰州交通年夜学情况与市政项目学院, 兰州 730070
  • 陈学平易近
  • 兰州交通年夜学情况与市政项目学院, 兰州 730070
  • 黄魁
  • 岐阜年夜学流域圈科学研究センター, 岐阜 501-1193 摘要:将含水率80.6%的脱水污泥制成5 mm的污泥颗粒,以添加蚯蚓(赤子爱胜蚓)为处置组,无蚯蚓为对比组,测定分歧期间污泥的理化性质、微生物碳量(MBC)和脱氢酶活性(DHA)的转变,重点研究了蚯蚓对污泥降解进程中MBC和DHA转变的影响.成果注解,比拟对比组,蚯蚓处置组pH转变幅度较小;尝试竣事时,蚯蚓处置组的电导率(EC)和消融性无机碳(DOC)显著高在对比组,而无机质(OM)显著低在对比组.尝试前30 d,蚯蚓处置组MBC显著高在对比组,40 d至尝试竣事,蚯蚓处置组MBC显著低在对比组.DHA的成果注解,蚯蚓处置组和对比组在前30 d并没有显著性差别,40 d后蚯蚓处置组的DHA显著低在对比组,DHA不变在2.98~6.40 mg·g-1·h-1(以TPF计).相干阐发注解,DHA、MBC和OM之间显著正相干.研究注解,接种蚯蚓在尝试前期显著晋升了系统的微生物量,加速污泥无机质的降解,从而致使后期产品的微生物量和其活性较低,终究产品更不变. Abstract:This study investigated the effects of earthworms on changes of microbial biomass carbon(MBC)and dehydrogenase activity(DHA)in the sewage sludge at the different stages during the 60-day decomposition experiments through analyzing physicochemical properties,especially changes of MBC and DHA in the comparison between two groups of sludge-with and without addition of earthworms. The dewatering sludge with 80.6% water content was regulated into 5 mm particles for the study while the species of earthworms Eisenia foetida were chosen for the experiments. The results indicated that the sludge with earthworms showed less variation of pH values, significantly higher electrical conductivity(EC) and dissolved organic carbon (DOC)at the end of experiments, but only organic matter(OM)was apparently lower than the compared sludge without earthworms. However, higher values of MBC were found in sludge with earthworms during the first 30 days, then much less than in sludge without earthworms from 40 days until finishing the experiments. The analytical results of DHA proved that there was no big difference between the two groups of sludge during the first 30 days. Nevertheless, DHA value in sludge with earthworms appeared to be stable with 2.98~6.40 mg (TPF)·g-1·h-1 after 40 day treatment, which was obviously lower than in sludge without earthworms. In addition,the correlation analysis evidenced that significantly positive relationships existed for DHA,MBC and OM in the decomposition treatment. This study verified that the presence of earthworms could stimulate the microbial numbers at the beginning of vermicomposting and accelerate the degradation of organic materials in sewage sludge treatment. As a result, the final products became more stable with relatively lower values of both MBC and DHA. Key words:sewage sludgeearthwormmicrobial biomass carbondehydrogenase activity第 35 卷第 1 期2015 年 1 月环  境  科  学  学  报  Acta Scientiae CircumstantiaeVol.35,No.1Jan., 2015基金项目: 国度天然科学基金(No.51168029);甘肃省科技支持打算项目(No.1104FKCA157)Supported by the National Natural Science Foundation of China ( No. 51168029) and the Program of Gansu Province Science and Technology ( No.1104FKCA157)作者简介: 伏小勇(1959—),男,传授,E⁃mail:fuxiaoyong7362@ mail.lzjtu.cn; ∗通信作者(义务作者)Biography: FU Xiaoyong(1959—),male,professor, E⁃mail:fuxiaoyong7362@ mail.lzjtu.cn; ∗Corresponding authorDOI:10.13671 / j.hjkxxb.2014.0721伏小勇,崔广宇,陈学平易近,等.2015.蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响[J].情况科学学报,35(1):252⁃ 256Fu X Y,Cui G Y,Chen X M, et al. 2015.Effects of earthworms on the microbial biomass carbon and dehydrogenase activity in decomposition treatment ofsewage sludge [J].Acta Scientiae Circumstantiae,35(1):252⁃ 256蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响伏小勇1,∗,崔广宇1,陈学平易近1,黄魁21. 兰州交通年夜学情况与市政项目学院,兰州 7300702. 岐阜年夜学流域圈科学研究センター,岐阜 501⁃ 1193收稿日期:2014⁃ 03⁃ 11      修回日期:2014⁃ 04⁃ 30      录用日期:2014⁃ 05⁃ 01摘要:将含水率80.6%的脱水污泥制成 5 mm 的污泥颗粒,以添加蚯蚓(赤子爱胜蚓)为处置组,无蚯蚓为对比组,测定分歧期间污泥的理化性质、微生物碳量(MBC)和脱氢酶活性(DHA)的转变,重点研究了蚯蚓对污泥降解进程中MBC 和DHA 转变的影响.成果注解,比拟对比组,蚯蚓处置组 pH 转变幅度较小;尝试竣事时,蚯蚓处置组的电导率(EC)和消融性无机碳(DOC)显著高在对比组,而无机质(OM)显著低在对比组.尝试前30 d,蚯蚓处置组 MBC 显著高在对比组,40 d 至尝试竣事,蚯蚓处置组 MBC 显著低在对比组.DHA 的成果注解,蚯蚓处置组和对比组在前30 d 并没有显著性差别,40 d 后蚯蚓处置组的 DHA 显著低在对比组,DHA 不变在2.98~ 6.40 mg·g-1·h-1(以 TPF 计).相干阐发注解,DHA、MBC 和 OM 之间显著正相干.研究注解,接种蚯蚓在尝试前期显著晋升了系统的微生物量,加速污泥无机质的降解,从而致使后期产品的微生物量和其活性较低,终究产品更不变.要害词:污泥;蚯蚓;微生物碳量;脱氢酶活性文章编号:0253⁃2468(2015)01⁃ 252⁃ 05      中图分类号:X703      文献标识码:AEffects of earthworms on the microbial biomass carbon and dehydrogenaseactivity in decomposition treatment of sewage sludgeFU Xiaoyong1,∗,CUI Guangyu1,CHEN Xuemin 1,HUANG Kui21. School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 7300702. River Basin Research Center,Gifu University,Gifu 501⁃ 1193,JapanReceived 11 March 2014;      received in revised form 30 April 2014;      accepted 1 May 2014Abstract: This study investigated the effects of earthworms on changes of microbial biomass carbon(MBC) and dehydrogenase activity( DHA) in thesewage sludge at the different stages during the 60⁃day decomposition experiments through analyzing physicochemical properties,especially changes of MBCand DHA in the comparison between two groups of sludge⁃with and without addition of earthworms. The dewatering sludge with 80.6% water content wasregulated into 5 mm particles for the study while the species of earthworms Eisenia foetida were chosen for the experiments. The results indicated that thesludge with earthworms showed less variation of pH values, significantly higher electrical conductivity(EC) and dissolved organic carbon (DOC) at theend of experiments, but only organic matter(OM) was apparently lower than the compared sludge without earthworms. However, higher values of MBCwere found in sludge with earthworms during the first 30 days, then much less than in sludge without earthworms from 40 days until finishing theexperiments. The analytical results of DHA proved that there was no big difference between the two groups of sludge during the first 30 days. Nevertheless,DHA value in sludge with earthworms appeared to be stable with 2.98~ 6.40 mg (TPF) ·g-1·h-1after 40 day treatment, which was obviously lower than insludge without earthworms. In addition,the correlation analysis evidenced that significantly positive relationships existed for DHA,MBC and OM in thedecomposition treatment. This study verified that the presence of earthworms could stimulate the microbial numbers at the beginning of vermicompostingand accelerate the degradation of organic materials in sewage sludge treatment. As a result, the final products became more stable with relatively lowervalues of both MBC and DHA.Keywords: sewage sludge;earthworm;microbial biomass carbon;dehydrogenase activity1 期 伏小勇等:蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响1  引言(Introduction)活性污泥中的无机成份首要是由歇息在活性污泥上的微生物群体和被微生物吸附的无机物构成,微生物则首要由细菌、真菌、原活泼物和后活泼物组成.活性污泥中的微生物以异养好氧细菌为主,增殖速度较高,具有较强的分化无机物并将其转化为无机物的功能(张自杰等,2000).但污泥脱水后微生物保存情况产生了转变,外源养分物资中止,微生物处在内源呼吸状况(尹军等,2001),代谢产品分散难度年夜,微生物种群和数目转变较年夜,致使污泥不变性差,在供氧不足时,极易腐蚀发臭,对情况发生二次污染.若何连结脱水污泥好养状况,加速微生物代谢速度,是污泥处置措置存眷的重点之一.蚯蚓在天然界物资轮回进程中的主要感化已广为人知,其能把不溶性无机物转化为微生物可操纵的无机物,增添微生物活性和基质操纵水平(Hickman et al.,2008;Sen et al.,2009).研究注解,蚯蚓与微生物的协同感化可加快无机物的分化(Domínguez et al., 2013; Suthar, 2009; Gupta et al.,2008;Sangwan et al.,2008;Aira et al.,2002).按照蚯蚓的糊口习性和生态位,连系污水处置工艺和污泥特点,将蚯蚓引入污水处置项目范畴,今朝已成为相干研究的热门之一( Zhao et al., 2010;吴敏等,2007;罗涛等,2013).研究发觉,蚯蚓介入污泥处置进程,会显著影响污泥理化性质,对不变处置系统、加速污泥降解具有增进感化(陈学平易近等, 2010a;2010b;2010c).固然微生物是污泥降解的要害者,但蚯蚓将间接或间接地改变微生物的勾当,终究影响系统的处置结果,是以,摸索接种蚯蚓后污泥微生物相的转变具有主要意义.基在以上斟酌,本文首要研究蚯蚓对污泥微生物量和其活性的影响,旨在为摸索该进程中微生物感化的机理和提高蚯蚓处置污泥的效力供给理论根据.2  材料与方式(Materials and methods)2.1  尝试材料尝试所用赤子爱胜蚓(Eisenia foetida)为尝试室培育.污泥为取自兰州市七里河污水处置厂的脱水污泥,将此污泥制成5 mm 粒径的颗粒污泥,作为尝试用污泥.污泥含水率为80.62%±0.01%,pH= 6.77±0.01,电导率(EC)为(573.00±8.49)μS·cm-1,无机质(OM)为 71.2%± 7.7%,消融性无机碳(DOC)为(16� 69± 0. 16) mg·g-1,总氮( TN)为( 51. 7 ± 1. 6)mg·g-1,C / N 为 6. 20 ± 0. 03,微生物碳量(MBC)为(105. 60 ± 1� 66 ) mg·g-1,脱氢酶活性( DHA) 为(314� 60±18� 40)mg·g-1·h-1(以 TPF 计).尝试用 6 个反映器,尺寸为 ϕ36 cm×12 cm,每一个反映器中加4 kg 颗粒污泥.3 个对比组不添加蚯蚓,3 个蚯蚓处置组中各放 100 条蚯蚓,每条重约1� 0 g.反映器上笼盖塑料膜保湿,深色笼盖物遮光,每一个反映器天天人工翻动 1 次.尝试情况温度为(25±1)℃.尝试共进行60 d,每 10 d 取样进行测定.一部门鲜样间接用来测定 OM、MBC 和 DHA,另取一部门阴干,研磨,过100 目筛,测其它理化目标.2.2  测定方式pH、EC 依照水土比 50∶ 1(mL / g)消融,磁力搅拌0.5 h,离心取上清液用 pH 酸度计、电导率仪测定;OM 采取灼烧法(550 ℃,5 h)测定;DOC 采取硫酸⁃重铬酸钾容量法(鲁如坤,2000)测定;MBC 测按时参考熏蒸提取⁃容量阐发法(吴金水等,2006),并加以改良,在熏蒸处置前将污泥制成均一的藐小颗粒;DHA 参考 TTC 还原法(尹军等,2004)进行测定.2.3  数据处置数据阐发采取 SPSS 17.0 统计软件,经由过程 T 查验阐发分歧处置间的差别性,并进行目标间的相干性阐发,显著性界说为 p<0.05.3  成果与会商 (Results and discussion)3.1  理化性质的转变在全部尝试进程中,蚯蚓处置组与对比组的pH、EC、OM、DOC 随时候的转变如图 1 所示.尝试前20 d,蚯蚓处置组与对比组的 pH、EC、OM 均无显著差别(p>0.05),20 d 后呈显著差别( p<0.05).由图1a 可看出,pH 不变在7 摆布,蚯蚓处置组比对比组pH 转变规模小,注解蚯蚓处置组污泥平抑无机酸与氨化感化的能力较强(李国粹等, 2000; Lazcanoet al.,2008;Fernández⁃Gómez et al.,2010b).基质代谢产品的堆集会影响反映系统的 pH,pH 的转变又会对微生物发展滋生和酶活性发生显著影响.反映系统 pH 转变幅度越小,注解代谢产品的不良堆集越少,越有益在微生物分化代谢能力和其酶活性的高效阐扬.脱水污泥好氧消化进程凡是只产生在污泥概况水膜层的微情况中,是以,将尝试污泥造粒(约5 mm)来增添污泥概况水膜层的面积,经由过程逐日翻混包管反映系统中氧的供给,使降解进程更近3 5 2环    境    科    学    学    报 35 卷似在活性污泥法的延续,是以,代谢产品堆集速度迟缓,这多是20 d 后pH 才产生转变的缘由.图1b中蚯蚓处置组较对比组的 EC 高,申明蚯蚓的介入能提高污泥矿化速度( Suthar et al.,2008).图 1c 注解,蚯蚓可加速 OM 的降解,蚯蚓与微生物协同感化结果优在微生物零丁感化.由图 1d 可看出,前 20 d蚯蚓处置组 DOC 小在对比组且呈显著差别( p <0� 05),40~60 d 蚯蚓处置组 DOC 年夜在对比组且呈显著差别(p<0.05).因为 DOC 表征微生物易操纵的无机碳,其含量与微生物量和活性有紧密亲密关系(卫东等,2011).前期蚯蚓处置组 DOC 低多是由于蚯蚓的刺激感化增进了微生物量的增加(Aira et al.,2007;Brown et al.,2000),从而加速了对 DOC 的操纵.尔后期蚯蚓处置组 DOC 较高可能源自蚯蚓摄食对微生物量的限制,减小了对 DOC 的操纵.图1  pH、EC、OM、DOC 随时候的转变(∗暗示在给按时间蚯蚓处置组和对比组之间有显著差别(p<0.05),下同)Fig.1  Changes of pH,EC,OM and DOC during vermicomposting process3.2  蚯蚓对 MBC 和 DHA 的影响MBC 是反应微生物量巨细的主要目标(张贵重等,2000).图2a 中蚯蚓处置组和对比组 MBC 均呈年夜致不异的减小趋向,前 10 d 转变猛烈,10 d 后相对平缓.MBC 延续下降注解微生物数目在不竭削减,这是由于一方面,活性污泥经沉淀脱水后,微生物处在内源呼吸期;另外一方面,在脱水污泥颗粒概况附着的水膜中,无机物的降解仍然在继续,但养分物资延续削减,两种身分均限制了微生物数目的增加,形成 MBC 不竭下降.图2a 显示,前30 d 蚯蚓处置组 MBC 显著高在对比组( p < 0. 05),以后又显著低在对比组( p <0� 05),不变在 4.45 ~ 6.49 mg·g-1之间.这多是由于前期蚯蚓粘液和分泌物对微生物的刺激感化增进了微生物的增加(Aira et al.,2007);尔后期跟着养分物资的不竭削减,蚯蚓取食微生物的感化致使蚯蚓处置组 MBC 显著低在对比组( Lazcano et al.,2008).脱氢酶是一种胞内酶,介入无机物的氧化磷酸化,其活性巨细能表征活性微生物对基质降解能力的强弱,可反应所有微生物的活性(Wolińska et al.,2012;Barrena et al.,2008;周春生等,1991;严媛媛等,2007).由图 2b 可看出,蚯蚓处置组与对比组DHA 呈不异的减小趋向,前 20 d 降落较着,20 d 后趋在平缓,40 d 后根基不变在较低程度,这注解污泥降解 速 率 先 快 后 慢 ( Fernández⁃Gómez et al.,2010b); 而 DHA 不变在较低程度申明污泥中年夜部门无机物已被降解.前 30 d 蚯蚓处置组比对比组DHA 高,但无显著性差别(p>0.05),40 d 后蚯蚓处置组 DHA 显著低在对比组(p<0.05),不变在 2.98 ~6.40 mg·g-1·h-1(以 TPF 计)之间.前期蚯蚓刺激感化提高了微生物量,加快了 OM 的降解,致使后期4 5 21 期 伏小勇等:蚯蚓处置对污泥中微生物碳量和脱氢酶活性的影响OM 含量较低,又因为 DHA 和 OM 具有显著正相干性(p<0.01)(表 1),使得后期 DHA 处在较低程度,终究产品加倍不变(Fernández⁃Gómez et al.,2010a).另外,也有研究认为DHA 较低是因为蚯蚓对微生物的摄食感化酿成的(Suthar et al.,2008).图2  MBC 和 DHA 随时候的转变Fig.2  Changes of MBC and DHA during vermicomposting process3.3  MBC、DHA、pH、EC、OM、DOC 的相干关系从表 1 能够看出,蚯蚓处置组和对比组中MBC、DHA 与 OM 呈显著正相干,但与 pH 与 EC 之间无显著相干性,注解污泥 OM 是 MBC 和 DHA 的首要限制身分.由蚯蚓处置组和对比组 MBC、DHA和 OM 的转变曲线(图1c、图2)猜测,微生物对污泥OM 的降解起首要感化,蚯蚓则加速了降解的历程,这与 Sen 等(2009)操纵蚯蚓处置制糖工业烧毁物的研究成果分歧.DOC 与 MBC、DHA 之间无相干关系,可能与基质性质分歧相关( Fernández⁃Gómezet al.,2010b).蚯蚓处置组与对比组中 MBC 和 DHA均呈显著正相干,注解污泥微生物量与其活性具有紧密亲密关系(Sen et al.,2009;Lazcano et al.,2008).表 1  对比组和蚯蚓处置组 MBC、DHA、pH、EC、OM、DOC 相干矩阵Table 1  Correlation matrices of MBC,DHA,pH,EC,OM,and DOC during vermicomposting process对比组MBC DHA pH EC OM  DOC蚯蚓处置组MBC DHA pH EC OM  DOCMBC 0.960∗ ∗ 0.196 0.463 0.794∗ 0.223 0.998∗ ∗ 0.368 0.544 0.891∗ ∗ 0.352DHA 0.960∗ ∗ 0.030 0.561 0.906∗ ∗ 0.389 0.998∗ ∗ 0.372 0.569 0.896∗ ∗ 0.383pH 0.196 0.030 0.671 0.281 0.742 0.368 0.372 0.868∗ 0.517 0.629EC 0.463 0.561 0.671 -0.802∗ -0.934∗ ∗ 0.544 0.569 0.868∗ -0.757∗ -0.812∗OM 0.794∗ 0.906∗ ∗ 0.218 -0.802∗ 0.692 0.891∗ ∗ 0.896∗ ∗ 0.517 -0.757∗ 0.425DOC 0.233 0.389 0.742 -0.934∗ ∗ 0.692 0.352 0.383 0.629 -0.812∗ 0.425    注:n = 3,∗暗示在 0.05 程度上显著相干,∗∗暗示在0.01 程度上显著相干.4  结论(Conclusions)脱水污泥的降解速度呈先快后慢的转变趋向,接种蚯蚓可减小系统 pH 的转变幅度,加快无机物的矿化.比拟对比组,蚯蚓处置污泥后,MBC 和 DHA显著下降.蚯蚓显著提高了处置系统前期MBC,加快OM 的降解,从而致使后期 MBC 与 DHA 较低,处置产品加倍不变.义务作者简介:伏小勇( 1959—),男,传授,硕导,研究标的目的为污(废)水处置与资本化、污泥资本化手艺与项目利用.E⁃mail:fuxiaoyong7362@ mail.lzjtu.cn.参考文献(References):Aira M,Monroy F,Domínguez J,et al.2002.How earthworm density affectsmicrobial biomas and activity in pig manure[J].European Journal ofSoil Biology,38(1): 7⁃ 10Aira M, Monroy F, Domínguez J. 2007. 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