Abstract: This study was conducted to assessing of selected heavy metals (Cr., Cd, Zn, Hg and Pb) accumulation in the edible portions of cabbage, tomato and onion cultivated around Wonji in eastern part of Ethiopia. The concentrations of the same heavy metals were determined in water samples collected directly from industry discharge and also three irrigation sites Varied between sampling points. Vegetable Samples were first optimized through wet digestion procedure and contents of heavy met...
Abstract: Understanding the importance of home gardens in the production of food, generating income, traditional medicine and other useful products for human beings is indispensable. In Ethiopia, research and documentation on home gardens are very few. The present study was intended to investigating the role of home gardens for improved livelihoods, plant species composition and their diversity. This study was conducted in Midakegn Woreda, West Showa zone, Oromia Region, Ethiopia from Septem...
Abstract: Nowadays declined natural resources alongside rapid population growth necessitate optimum use of scarce land resources based on their potentials. In this regard, land suitability evaluation which identifies the fitness of land for a defined use has no substitute. It is with this understanding that a study was proposed to evaluate the suitability of land at Edo Gojola watershed for major rainfed cereal crops wheat, maize, teff and sorghum. This study was aimed to identify suitabilit...
Abstract: The use of benthic macro invertebrates together with physico- chemical parameters was considered as the reliable method for water quality assessment. This study was conducted to assess the level of pollution in the Rukkisa River water using biological and physico chemical parameters. Three sampling sites were selected, one site was not affected by the coffee processing plant effluent used as reference site and two affected sites in the outlet and downstream were used to collect the...
Abstract: Recently, the use of organic liquid fertilizer assumed as a proper and practical fertilizer for plant productivity purposes. This study aimed to produce ecologically friendly organic liquid fertilizer from cow manure and onion peels that can be used for hydroponic growth of lettuce (Lactuca sativa L.). The fermentation process was carried out in open container covered with cotton cloth (to prevent entries of insects). After 43 days of fermentation the mixture was converted in to or...
Abstract: Production of biogas through anaerobic digestion of organic waste materials provides an alternative environmentally eco-friendly renewable energy. In this study, biogas production from co-digestion of the Justicia schimperiana and cow dung in five mix ratios,A100%JS, B 75%JS: 25%CD, C 50%JS:50%CD, D25%JS:75%CD, E100%CD was evaluated under mesophilic conditions (38ºC) using a batch digester in microbiology laboratory of Haramaya University. In all treatments, Total solid, Volatile ...
Abstract: Food safety issues are of growing concern to consumers globally because of the risks associated with consumption of foods contaminated with heavy metals and pathogenic microbes. In Harar town, kebele 05 vegetable farm is known to produce vegetables irrigated with wastewater. To what extent these vegetables are contaminated with heavy metals and pathogens was not known. Thus, a laboratory based cross sectional study was conducted from October 2016 to January 2017 to assess the exten...
Abstract: Energy is one of the most important factors for human development and to global prosperity.Biogas is a versatile renewable energy source, which can be used for replacement of fossil fuels in power and heat production. Therefore, this research was initiated to utilize biomasses such as Vernonia auriculifera leaves (VA) and cow dung (CD) for biogas production. In this study, biogas production from co-digestion of the VA and CD in five mix ratios (100% VA, 70% VA: 30% CD, 50% VA: 50% ...
Abstract: The level of water pollution and ecological disturbance of Ejersa river was assessed using physico-chemical parameters and benthic macro-invertebrates. Ejersa river which is part of the Omo-Gibe basin is used for various activities such as irrigation, washing and cattle watering. But it is exposed to wastewater discharge from municipal sewage, nearby prison institution and abattoir. Three sites selected randomly at upstream as site one, at the back of prison institution in middle o...
Abstract: The use of benthic macroinvertabrates together with physico- chemical parameters are considered as the reliable method for water quality assessment. The main objective of this study was to determine the water qualities of Meta River using biological and physico chemical parameters. One reference site which is less affected by the beer factory effluent discharge and two affected sites in the down stream were used to collect the water samples. A total of three water samples were coll...
Abstract: This paper introduces the various upstream land use activities that are major contributors of downstream water pollution. The proposed measures to reduce the pollution of downstream water bodies such as sustainable agricultural activities, systematic land allocation and management are discussed in the paper. It presents the analysis of upstream land use against the water quality parameters measured at different water management facilities to identify the most significant land use f...
Abstract: In this study, activated biochar from municipal sewage sludge was used for the treatment of sewage water. The sewage physicochemical parameters were measured before and after bio filtration with biochar applying the principle of adsorption using the standard methods. Biochar with 500 m2/g surface area at a loading of 2.5 g/L was employed. A reduction of more than 75% was observed for the total nitrogen, biological oxygen demand, chemical oxygen demand, total solids, electrical cond...
Abstract: This paper is a case study review of the timber waste problem and solutions that have been proffered in the Manicaland region of Zimbabwe. The study was conducted through primary data collected during site visits and a review of literature reports on the area. It revealed the absence of up to date quantitative and spatial data on timber waste, with literature reporting at least 70,000 tonnes per annum of sawmill waste. Most of the offcuts and chips are utilized at commercial sawmil...
Abstract: The recovery of precious metals like gold is increasing each day due to its high market prices along with diverse applications. Bio-sorption represents a biotechnological innovation as well as a cost effective and excellent tool for recovery of precious metals from aqueous solutions. This study offers an overview of a recent scenario of bio-sorption studies carried out on the use of some promising bio-sorbents which could serve as an economical means for recovering gold for small s...
Abstract: Plastics have remained the material of choice, and after serving their intended purpose, a large proportion ends up in the environment where they persist for centuries. The packaging industry is the largest and growing consumer of synthetic plastics derived from fossil fuels. Food packaging plastics account for the bulk of plastic waste that are polluting the environment. Additionally, given the fact that petroleum reserves are finite and facing depletion, there is a need for the d...