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An LCA study on sludge retreatment processes in Japan

Advantages of concurrently treating kitchen wastes, night soil, and night soil digestion sludge, using high-speed methane fermentation system

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Abstract

The majority of night soil (human excrements) is source separated from other sewage water and treated at night soil treatment plants in Japan. Efforts have been made to achieve material recovery from this organic mass, together with other organic wastes such as kitchen wastes and manure, by expanding the functions at night soil treatment plants. These facilities with expanded function are called ‘sludge retreatment centers’, which are promoted by the Japanese Ministry of Health and Welfare. Potential environmental impacts of sludge retreatment using two presently available systems in Japan are analyzed for comparison. Systems compared are: 1) Mebius system, a high-speed fermentation process with methane gas recovery and compost production and 2) a comparable system with a basic composting process. The functional unit for this study is concurrent treatment of 40 t/d of kitchen waste, 40 m3/d of night soil, and 60 m3/d of private sewage treatment tank sludge. Impact assessment on Global Warming (IPCC 1996, 20 yrs.), Acidification Potential (De Leeuv — AP), Eutrophication Potential (De Leeuv- EP) and Resource Index (Fava/SETAC & Heijungs) all indicated that sludge retreatment with Mebius system provides a better environmental performance. The main reasons are: 1) production of power using recovered methane and 2) reduction of sludge volume by digestion, which leads to reduction of fuel required for sludge drying. The collection and treatment of night soil and kitchen wastes involves many economic and social factors. Therefore, more studies with different functional units on these systems should be made to obtain a more complete picture that can be used for decision-making processes. The results of this study can be used as a starting point.

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References

  1. Suzuki T, Tohya Y (1986): Night Soil Treatment by the Nitrified Liquor Recycling Process. Water Science and Technology, v. 18 no.7/8, Tokyo, Japan, p 352

  2. Ministry of Health and Welfare Home Page (http://www.mhw.po.jp/houdoe//1108/h0830-3 14h.html): Summary of Generation and Treatment of Municipal Wastes in 1996. Ministry of Health and Welfare, Environmental Health Bureau, Water Supply and Environmental Sanitation Dept., Waste Management Div., Tokyo, Japan

  3. Ministry of Health and Welfare, Environmental Health Bureau, Water Supply and Environmental Sanitation Dept., Waste Management Div. (1998): Handbook of Waste Management Facility Operation Guidelines. Japan Waste Management Association, Tokyo, Japan, p 71

    Google Scholar 

  4. GaBi 3 (1998): Software, Databases and Documentation for Life Cycle Engineering. IKP University of Stuttgart and PE Product Engineering GmbH, Stuttgart, Germany

    Google Scholar 

  5. IPCC (Intergovernmental Panel on Climatic Change) (ed.) (1996): Climate Change 1995. IPCC Secretariat, World Meteorological OrganizationThe Science of Climate Change. IPCC Secretariat, World Meteorological Organization. MIT University Press, Cambridge

    Google Scholar 

  6. De Leeuw F (1993): Assessment of the Atmospheric Hazards and Risks of New Chemicals: Procedures to estimate ‘Hazard Potentials’. National Institute f Public Health and Environmental Protection, p 1324 ff

  7. Fava J, Consoli F et al. (1993): A Conceptual Framework for Life-Cycle Assessment (Sandestin-Report), SETAC-USA, Pensacola, FL (USA)

  8. Heijungs R et al. (1992): Environmental Life Cycle Assessment — Guide. Centrum voor Milieukunde (CML), Leiden

    Google Scholar 

  9. Iriyama K et al. (1999): An LCA Study of Two Sludge Retreatment Processes: Ebara Mebius System vs. Paddle-type Composting and J Water Treatment System, an Internal Report for Ebara Corporation

  10. Ministry of Agriculture, Forestry, and Fisheries (Agricultural Production Bureau, Fertilizer and Machinery Division) (1998): Statistical Abstract of Fertilizers: Association of Agriculture and Forestry Statistics, Tokyo, Japan, p 49–57

  11. Yoneyama A et al. (1999): Methane Fermentation of Organic Wastes by Mebius Demonstration Test Plant. Ebara Jiho, No. 185

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Authors and Affiliations

  1. PE-Asia Corporation, 4-22-10 Takanawa, Minato-ku, Tokyo, Japan

    Keiko Iriyama Strauss

  2. PE Product Engineering GmbH, Kirchheimer Str. 76, D-73265, Dettingen/Teck, Germany

    Michael Wiedemann

Authors
  1. Keiko Iriyama Strauss
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  2. Michael Wiedemann
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Correspondence to Keiko Iriyama Strauss.

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Strauss, K.I., Wiedemann, M. An LCA study on sludge retreatment processes in Japan. Int. J. LCA 5, 291–294 (2000). https://doi.org/10.1007/BF02977582

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  • DOI: https://doi.org/10.1007/BF02977582

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