Rotary drum composting of vegetable waste and tree leaves |
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Authors: | Ajay S Kalamdhad Yatish K Singh Muntjeer Ali Meena Khwairakpam AA Kazmi |
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Institution: | aDepartment of Civil Engineering, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, India;bDepartment of Civil Engineering, Indian Institute of Technology Roorkee (IITR), Roorkee 247667, India |
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Abstract: | High rate composting studies on institutional waste, i.e. vegetable wastes, tree leaves, etc., were conducted on a demonstration-scale (3.5 m3) rotary drum composter by evaluating changes in some physico-chemical and biological parameters. During composting, higher temperature (60–70 °C) at inlet zone and (50–60 °C) at middle zone were achieved which resulted in high degradation in the drum. As a result, all parameters including TOC, C/N ratio, CO2 evolution and coliforms were decreased significantly within few days of composting. Within a week period, quality compost with total nitrogen (2.6%) and final total phosphorus (6 g/kg) was achieved; but relatively higher final values of fecal coliforms and CO2 evolution, suggested further maturation. Thus, two conventional composting methods namely windrow (M1) and vermicomposting (M2) tried for maturation of primary stabilized compost. By examining these methods, it was suggested that M2 was found suitable in delivering fine grained, better quality matured compost within 20 days of maturation period. |
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Keywords: | Solid waste Rotary drum composter Temperature Compost dynamics Vermicomposting |
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