Design and Development of Low-Cost Portable Household Composter
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Composting operation was performed at household level with a drum composter fabricated with a drum and hand-operated mechanical system. The drum was divided into three compartments, first being the detachable one fitted with an iron mesh and cutting blades, second one with perforations for aerobic composting operation (effective volume 0.21 m3) and an opening for drawing samples and end product, third one with a tap fixed for leachate collection separated by Aluminium Composite Panel (ACP) sheet and iron mesh to support the feed. The feed constituted household organic waste (garden waste, vegetables and fruit peelings and overnight leftover cooked food waste); these were fed in the quantity as generated on daily basis along with this an inoculum prepared with tea residue (kept in limited air for 6 days) was mixed at every 7-day interval. The residue showed good fungal growth and was tested for the presence of bacteria on agar plates. Essential parameters were monitored at 15 days and with leachate recycling and monitoring at 7-day interval. The analysis reflected that the composting can be successfully done with the fabricated composter in 81 days; with continuous operation, it can serve a family of 4–8 members throughout the year considering 70% volume reduction as per observations. Analysis ended up with organic carbon 18.27% by weight, total nitrogen 0.92% by weight, potash 0.723% by weight and phosphates 0.39% by weight, copper 48.8 mg/kg and zinc 248.1 mg/kg which is overall a good composition for compost. The final pH was 7.12 which is also appreciable for using the product as compost. The results reflected its suitability to be used at household level.
KeywordsComposting Household Organic waste
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