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伏小勇,崔廣宇,陳學民,黃魁.蚯蚓處理對污泥中微生物碳量及脫氫酶活性的影響[J].環境科學學報,2015,35(1):252-256

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  • 伏小勇,崔廣宇,陳學民,黃魁.蚯蚓處理對污泥中微生物碳量及脫氫酶活性的影響[J].環境科學學報,2015,35(1):252-256

  • 蚯蚓處理對污泥中微生物碳量及脫氫酶活性的影響
  • Effects of earthwormson the microbial biomass carbon and dehydrogenase activity in decomposition treatment of sewage sludge
  • 基金項目:國家自然科學基金(No.51168029);甘肅省科技支撐計劃項目(No.1104FKCA157)
  • 作者
  • 單位
  • 伏小勇
  • 蘭州交通大學環境與市政工程學院, 蘭州 730070
  • 崔廣宇
  • 蘭州交通大學環境與市政工程學院, 蘭州 730070
  • 陳學民
  • 蘭州交通大學環境與市政工程學院, 蘭州 730070
  • 黃魁
  • 岐阜大學流域圈科學研究センター, 岐阜 501-1193
  • 摘要:將含水率80.6%的脫水污泥制成5 mm的污泥顆粒,以添加蚯蚓(赤子愛勝蚓)為處理組,無蚯蚓為對照組,測定不同時期污泥的理化性質、微生物碳量(MBC)和脫氫酶活性(DHA)的變化,重點研究了蚯蚓對污泥降解過程中MBC和DHA變化的影響.結果表明,相比對照組,蚯蚓處理組pH變化幅度較小;實驗結束時,蚯蚓處理組的電導率(EC)和溶解性有機碳(DOC)顯著高于對照組,而有機質(OM)顯著低于對照組.實驗前30 d,蚯蚓處理組MBC顯著高于對照組,40 d至實驗結束,蚯蚓處理組MBC顯著低于對照組.DHA的結果表明,蚯蚓處理組和對照組在前30 d并沒有顯著性差異,40 d后蚯蚓處理組的DHA顯著低于對照組,DHA穩定在2.98~6.40 mg·g-1·h-1(以TPF計).相關分析表明,DHA、MBC和OM之間顯著正相關.研究表明,接種蚯蚓在實驗前期顯著提升了系統的微生物量,加快污泥有機質的降解,從而導致后期產物的微生物量及其活性較低,最終產物更穩定.
  • 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.
 
 
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