Nutrient and enzymatic changes of hydrolysed tannery solid waste treated with epigeic earthworm Eudrilus eugeniae and phytotoxicity assessment on selected commercial crops

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• 作者：B. Ravindran (1) (3)
  S. M. Contreras-Ramos (2)
  J. W. C. Wong (3)
  A. Selvam (3)
  G. Sekaran (1)
  
• 关键词：C–N ratio ; Enzyme activities ; Eudrilus eugeniae ; Fermented ANFL ; Seed germination ; Vermicomposting
• 刊名：Environmental Science and Pollution Research
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：21
• 期：1
• 页码：641-651
• 全文大小：308 KB
• 作者单位：B. Ravindran (1) (3)
  S. M. Contreras-Ramos (2)
  J. W. C. Wong (3)
  A. Selvam (3)
  G. Sekaran (1)
  
  1. Environmental Technology Division, Central Leather Research Institute, Adyar, Chennai, 600 020, India
  3. Department of Biology, Hongkong Baptist University, Kowloon Tong, Hong Kong SAR, People’s Republic of China
  2. Environmental Technology Unit, Center for Research and Assistance in Technology and Design of the State of Jalisco (CIATEJ), Av. Normalistas No. 800 Col. Colinas de la Normal, 44270, Guadalajara, Mexico
  
• ISSN：1614-7499

文摘

Animal fleshing (ANFL) is the predominant proteinaceous solid waste generated during processing of leather and it is confronting disposal problems. The aim of this study was to assess the potential of epigeic earthworm Eudrilus eugeniae to utilize and transform the fermented ANFL in the solid state (SSF) and submerged state (SmF) into a value added product along a low residence period (25?days). A total of six treatment units containing different waste mixture compositions were established. Fifty healthy and non-clitellated earthworms were introduced in three different treatment containers: control, SSF, and SmF (+worm). Another set of treatment mixtures (control, SSF, SmF) was established without earthworms (?worm) to compare the results. The products were characterized for physico-chemical, enzymatic analysis and seedling growth parameters to compare the differences in the process with and without earthworms. The changes observed in the analytical parameters were in the following order: SSF > SmF > control mixtures (p-lt;-.05). The vermicompost showed a significant reduction in heavy metals, total organic carbon and an increase in total Kjeldhal nitrogen as compared to the product untreated by earthworms. The maximum enzymatic activities were observed after 21?days of vermicomposting. The relative seed germination of vermicompost extracts were in the order of tomato (Lycopersicon esculentum) > green gram (Vigna radiata) > cucumber (Cucumis sativus) > bottle gourd (Lagenaria siceraria (Mol.) Standl.) and showed no phytotoxicity effects. The results indicated that the combination of both ANFL hydrolysis through fermentation and vermicomposting is a good alternative to the management of this kind of waste.