Abstract
BackgroundThe present study evaluated the compost quality from municipal solid waste (MSW) and organic additives of coffee by-products and leaf of Millettia ferruginea. Compost sample (n = 30) was taken from fresh compost materials and MSW and different organic additive treatments (T1, T2, T3, T4, and T5). Compost treatments phytotoxicity test was conducted using lettuce seed (Lactuca Sativa L. var. crispa). Analysis of variance (ANOVA) was performed using SPSS (version 22) on major compost quality characteristics.ResultsThe compost Physico-chemical characteristics like temperature (26.4 °C), moisture content (45.5%), electrical conductivity (4.6 mS/cm), pH (7.9), total nitrogen (1.2%) and phosphorous content (2918 ppm) in T4 and T5 were analogous but both are significantly different from T3, T2 and T1 compost treatments. Phytotoxicity test using 100% compost treatment media showed that T4 (101%) and T5 (102%) are phytonutrient for lettuce plant. While, T3 and T2; and T1 compost treatments are non-phytotoxic and moderately phytotoxic respectively to lettuce plant.ConclusionTherefore, compost from MSW + M. ferruginea (T4) and MSW + coffee pulp + M. ferruginea (T5) are important for improving the physico-chemical characteristics of compost and are phytonutrient for lettuce plant. Thus, for effectively management of the 75% of organic fraction of waste generated from households in the study area, recycling methods like composting with organic additives must be used at large.
Highlights
Municipal solid wastes are one of the global environmental challenges and major source of environmental pollution [1]
In Ethiopia, 6,532,787 tons of municipal solid waste (MSW) generated per year in 2015 [4] and Addis Ababa alone generated a total of 754,236 tons of MSW per year, with an average per capital waste generation of 0.45 kg/ person/day in 2018 [5]
The municipal solid waste generation and management has been a major challenge for Bench Maji Zone towns, especially Mizan– Aman town
Summary
Municipal solid wastes are one of the global environmental challenges and major source of environmental pollution [1]. In Ethiopian cities, municipal solid waste is managed using simple and cheapest option like disposing in landfills by means of open dumping [5]. This has been found to be the main source of urban pollution and potential threat to the public health, ecosystem and quality of life [6]. The present study evaluated the compost quality from municipal solid waste (MSW) and organic additives of coffee by-products and leaf of Millettia ferruginea. Analysis of variance (ANOVA) was performed using SPSS (version 22) on major compost quality characteristics
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