Rotary Drum Composting Of Different Organic Waste Mixtures  

Oleh:

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Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Waste Management & Research vol. 27 no. 2 (Apr. 2009), page 129-137.
Topik: Decentralized composting; rotary drum; C/N ratio; mixed organic waste; temperature; coliform; BOD/COD ratio; wmr 1290–6
Fulltext: 129.pdf (187.0KB)

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The effects of three different mixtures of organic waste on composting in a rotary drum were examined by measuring changes in physico-chemical and biological parameters. It was observed that the time courses of the three mixtures: run A (grass cuttings, vegetable waste and food waste), run B (cattle manure, vegetable waste and sawdust) and run C (cattle manure, food waste, vegetable waste, paper waste and sawdust) were quite diverse. Run B, with initial C/N ratio 22 and containing a large proportion of cattle manure produced high quality and mature compost within 20 days. It showed a final total nitrogen (2.1%), final total phosphorus 3.52 g kg–1, final total organic carbon (TOC) (24.8%) and final moisture content (44%). At the end of 20 days, higher degradation led to final chemical oxygen demand (COD) (454 mg L–1), biochemical oxygen demand (BOD) (107 mg L–1), fecal coliform (1.2 × 102 bacteria g–1), fecal streptococci (85 bacteria g–1) and low electrical conductivity (1.658 dS m–1), respectively. Furthermore, run C with initial C/N ratio of 30 and containing a larger amount of food and vegetable waste produced good quality compost and resulted in 4.34% total nitrogen and 2.42% total phosphorus after 20 days, but, it had higher final fecal coliform 2.5 × 104 bacteria g–1, fecal streptococci 2.1 × 104 bacteria g–1, high TOC and NH4-N and a BOD/COD ratio of 0.63, which rendered it hygienically unsafe and immature. Finally, run A with initial C/N ratio of 15 showed a higher amount of EC (4.84 dS m–1), NH4-N, BOD/COD ratio of 0.4 with 15% nitrogen loss, which indicated an unstable product even after 20 days of composting. Therefore, it was found that rotary drum composting of a combination of cattle manure, vegetable waste and sawdust resulted in a primary stabilized compost within 20 days of composting.

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