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Feasibility of Co-Composting Process of Scum and Night Soil Sludge in FOG Management

Feasibility of Co-Composting Process of Scum and Night Soil Sludge in FOG Management. Omjit Sillaparassamee. Faculty of Public Health, Mahidol University. Introduction. 54 tons/day of scum has been discarded from 12,000 places of restaurants in Bangkok

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Feasibility of Co-Composting Process of Scum and Night Soil Sludge in FOG Management

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  1. Feasibility of Co-Composting Process of Scum and Night Soil Sludge in FOG Management OmjitSillaparassamee Faculty of Public Health, Mahidol University

  2. Introduction • 54 tons/day of scum has been discarded from 12,000 places of restaurants in Bangkok • Composting is easiness and low cost of operation. http://roongaroonenvironment.blogspot.com/2010_09_01_archive.html http://uniquehomeriview.com/common-good-gardens.html

  3. Introduction • Scum have low nitrogen and phosphorus content • Night soil sludge is high nitrogen concentration. http://roongaroonenvironment.blogspot.com/2010_09_01_archive.html

  4. Objective To determine the potential of co-composting process of scum collected from grease trap and night soil sludge

  5. Methodology Scum Night soil sludge

  6. Methodology Physicochemical properties of scum and night soil sludge

  7. Methodology Scum C:N ratio 30:1 and moisture content at 40-60% + Night soil sludge

  8. Methodology • Turning frequency at every • 4 days • Temperature monitoring every day • Determination of Total organic carbon, Total nitrogen , FOG and pH Temperature monitored point Compost Temperature monitoring

  9. Results and Discussions • The temperature of • compost pile started at 33C. • The maximum temperature was 50C at day 12. • The optimal composting • time was at day 110.

  10. Results and Discussions • TOC concentration slowly decreased from 44.10% to 34.89% by weight at the end of process. • The reduction of TOC indicates decomposition of organic matter by the microorganisms.

  11. Results and Discussions Characteristics of Compost Source: * Land Development Department, Thailand,2002

  12. Conclusion • Co-composting process of scum and night soil sludge can be used in management of scum from grease trap and night soil sludge. • Characteristic of compost meets to the compost standard. • Retention time of composting process is about 110 days at C:N ratio30:1.

  13. Thank You

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