Evaluation of Composting Process and Quality of Compost from Coffee By-Products (Coffee Husk & Pulp)

Abstract

Coffee pulp and husk are the main by-products generated by the coffee processing station and are disposed into arable land and surface water. Due to the contribution of these by-products to environmental pollution, environmentally friendly disposal methods are necessary. Therefore, composting as environmental friendly option for utilization of coffee by-products is important. The objectives of the study were to assess the properties of coffee by-products compost and analyzing changes in physico-chemical properties during process of composting. To this end, (coffee husk + pulp) (control), (coffee husk + pulp + cow dung), (coffee husk + pulp + Millettia ferruginea), (coffee husk + pulp + cow dung + Millettia ferruginea), (coffee husk + pulp + effective microorganism) were used to prepare compost. The experiment was laid in RCBD (5x3). The physico-chemical parameters were determined for all the treatments at 25, 45 and 70 days of composting. The level of pH in coffee by-products compost amended with Millettia ferruginea were highly significant (P<0.0001) as compared to coffee by-products compost amended with cow dung and effective microorganism alone. The level of N and Exch. K in coffee by-products compost amended with cow dung and Millettia ferruginea were highly significant (P<0.0001) as compared to the control and coffee by-products compost amended with cow dung and effective microorganism alone. The level of total N, OM, and C/N ratio in 25 day of composting were highly significant (p<0.0001) as compared to 70 day of composting. The physico-chemical parameter in different time of composting indicates that, composting coffee by-products compost up to 70 day were important to acquire quality compost. Comparison of experimental results proved that coffee byproducts compost amended with Millettia ferruginea and cow dung was better than other treatments for quality compost preparation. It is better to amend the coffee by-products with organic material before composting to improve the quality of the compost.

Green Manures and Crop Residues as Source of Nutrients in Tropical Environment

“…The variation in nutrient content within the same post-harvest processing must be taking into account, but mainly when they are from different processing (Figure 3). Composting is also a good option for husk use [125,126].…”

Evaluating Methods of Composting on Date of Maturity and Quality of Compost in Assosa, Western Ethiopia

“…In support to this result Varma [26] reported, leaching of nutrients including N, P and K from compost pile and composting drum and the leachate loss from drum composting method was the least compared to pile composing methods. On the other hand it could be due to decomposition state of the compost as a result of the different methods, since highly decomposed and stabilized compost contains high amount of potassium [27].…”

Composting and co-composting of coffee husk and pulp with source-separated municipal solid waste: a breakthrough in valorization of coffee waste

“…Recent case studies (Franca and Oliveira 2009;Kassa et al 2011;De Rezende et al 2012;Shemekite et al 2014;Degefe et al 2016) reported composting of coffee husk with cow dung, fruits/vegetables, effective microorganisms and Khat (Catha edulis). However, no research was carried out to investigate the composting and co-composting of coffee husk and pulp with source-separated municipal solid waste including the leaves of false banana (Ensete ventricosum), fruits, vegetables, khat/Catha edulis and soft dry wood at different proportions.…”