Evaluation of compost quality from municipal solid waste integrated with organic additive in Mizan–Aman town, Southwest Ethiopia

Abstract

Background The 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. Results The 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. Conclusion Therefore, 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.

Differences in smallholder farmers compost pits in terms of production and quality across Burkina Faso: The case of Eastern Region

“…For example, low density composts in Komondjari were primarily composed of livestock dung and farmyard manure while Kompienga composts contain crop residues. The bulk densities observed in our study were similar to those reported by Mamo et al (2021) producing compost from rice straw with different supplement addition and by Vázquez and Soto (2017) and Azim et al (2017) in the review paper for different type of compost. We observed that the bulk density increased with the decrease of the OM content.…”

Assessing Physiochemical Characteristics of Agricultural Waste and Ready Compost at Wadi Al-Far’a Watershed of Palestine

“…The MC of the 17 tested samples was in the range of 5.37–85.50%, and the average value was 19.61%. The optimum MC in the compost mixture shall be in the range of 40–60% [ 21 , 23 ]. Other references in the literature showed a wider range of MC (i.e., 25–80%) for effective composting of organic materials [ 21 ].…”

“…The spectrophotometer analysis was used to determine the P content in compost samples digested in acid mixture [ 6 , 8 , 21 , 55 ]; however, K was measured by a flame photometer [ 8 , 19 , 46 , 47 ]. The procedure illustrated in the 3051A method of the United States Environmental Protection Agency [ 56 ] was adopted to determine the Na, Ca, and Mg contents of the samples.…”

“…They assessed 10 physiochemical parameters and eight heave metals and found that the 12 compost plants produced low-fertility and poor-quality compost materials that did not meet several standards. In summary, adding organic additives to municipal solid waste is a key solution to improve the physiochemical characteristics of compost materials [ 8 , 21 ].…”

The effect of microwave stabilization on the properties of whole wheat flour and its further interpretation by molecular docking

“…Data were analyzed by ANOVA [ 24 , 25 ], and the Ryan-Einot-Gabriel-Welsch (REGWQ) multiple range test was used for significant difference determination at the P < 0.05 level [ 26 ] by SPSS software (version 21.0).…”