Abstract: Amylases are important enzymes commonly used for the hydrolysis of starch to generate hydrolysates useful for different industrial applications. This study was aimed at isolating amylase producing fungal species from decomposed wastes and spoiled foods using solid state fermentation. The isolated fungal species were screened experimentally using the starch hydrolysis test and identified based on cultural and microscopic characteristics. Amylase activity was determined using the din...
Abstract: Biogas is an alternative eco-friendly renewable energy source that produced by methanogenic bacteria through anaerobic digestion of organic materials. In this research, biogas production from co-digestion of the cow dung (CD) and groundnut shell (GS) with five mix ratios (T1 100%CD,T2 75%CD+25%GS,T3 50%CD+50%GS,T4 25%CD +75%GS,T5 100%GS) was evaluated under mesophilic conditions (38ºC) using batch fermentation for 21 days. The substrates were prepared with different total solid pe...
Abstract: Biogas is a methane gas produced through anaerobic digestion fermentation of organic matter. The aim of this study was to determine the optimal mix ratio for biogas production from anaerobic digestion of vegetable waste (carrot and cabbage waste) and goat manure. The experiment was batch operated and daily gas yield from the mixture was monitored for 30 days. The parameters measured were total solids (TS), volatile solids (VS), organic carbon, and moisture content. For the experime...
Abstract: Production of biogas through anaerobic digestion of organic waste materials provides an alternative environmentally friendly renewable energy. In this study, biogas production from codigestion of corn cob with cow dung in five mix ratios was evaluated under mesophilic condition (38ºC) using a batch digester for 30 days. In all substrates, VS, organic carbon, pH and C: N ratios were measured before and after digestion. The Parameters studied were total solids (TS), volatile solids ...
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 cow manure (CM) and Datura stramonium leaves (DSL) in five mix ratios (100%CM, 60%CM:40%DSL, 50%CM:50%DSL, 40%CM:60%DSL and 100%DSL) were evaluated under mesophilic condition at 38ºC using a batch mode digester over 30 days fermentation. In all the treatments, physico-chemical parame...
Abstract: The use of wastewater to produce food crops particularly vegetables is very prevalent within and outside the urban centers of developing countries. In the capital city of Ethiopia, Addis Ababa, where irrigation water for cultivation of vegetables is commonly derived from the polluted Akaki River, the practice has often been blamed for causing negative externalities to public health and the environment. To address these issues, the studies of this doctoral dissertation mainly focuse...
Abstract: Bio-fuel production from agricultural, municipal, and industrial wastes through anaerobic digestion is meant for sustainable energy supply and eco-friendly waste management. Therefore, the objective of this study was to determine biogas yield using Strigahermontica as a solo substrate and co- digestion with poultry manure. The experimental analysis revealed that there was variation among the pH values of the substrates before and after anaerobic digestion. The mean pH value of the ...
Abstract: Cultivation of edible mushrooms using agricultural invasive weeds could play a paramount role by producing foods with high nutritional value, and at the same time create environmentally friendly ways of food production. Thus, an experiment was conducted at Mushroom Research, Production and Training Laboratory of Haramaya University to cultivate three selected Pleurotus mushroom using three substrate and their combinations (dried leaves of Eichhornia crassipes (LEC) & Argemone ochro...
Abstract: The use of renewable energy sources can contribute to solve the present and future energy problems. Among the alternative energy sources, biogas production from green energy crops and organic waste has worldwide application as it yields a good quality fuel and fermented slurry, which may be used as a manure or soil conditioner. In this study, Biogas Production from Water Hyacinth (Eichhornia crassipes) Co-digestion with Poultry Manure in five mix ratios was evaluated under mesophil...
Abstract: Wastewater contains a variety of chemical, physical and microbial contaminants which may significantly affect soil properties as well as ecosystem function when used for different purposes such as irrigation. Around Harar city, brewery and municipal wastewater has been in use for irrigating some crops cultivated in the area which may have impacted soil properties. The study was aimed to investigate the impacts of brewery and municipal wastewater (BMWW) on selected soil physico-chem...
Abstract: Biogas generation and its utility as an alternative renewable energy source are gaining attention, particularly among developing countries. In this study, biogas production was evaluated from Gosspium barbadense leaves (GB) and cow dung (CD) co-digestion in five mixed ratios (A =100% GB, B=25 % GB+75% CD, C=50%GB+50%CD, D=75 %GB+25%CD, E= 100% CD.) under mesophilic conditions using batch digesters. The daily biogas production was subsequently measured by the water displacement meth...
Abstract: Renewable resources play a significant role in reducing carbon dioxide emissions around the world, and with this in mind, biomass and waste is a candidate to be one of the most widely utilized renewable energy resources. Therefore, this research was conducted to investigate the production of biogas from saw dust, cow dung in solo or mix through anaerobic digestion with five treatment ratios, under mesophilic condition (38ºC) using batch digesters at Haramaya University for 30 days...
Abstract: iogas technology, which is meant to produce methane rich gas through anaerobic digestion of biological materials, is an environmentally friendly technology that decreases environmental pollution through decomposing organic wastes and positively impacts the socio-economy of the society. Therefore, the research was conducted to investigate the production of biogas from corn Stover co-digested with goat manure through anaerobic digestion. In this study, five different proportions of C...
Abstract: Biogas is the methane rich gas produced by anaerobic breakdown of organic wastes with the help of methanogenic bacteria under oxygen free environment. The objective of this study was to evaluate production of biogas from co-digestion of goat manure and sludges of beer under anaerobic condition. The three containers were interconnected with a plastic tube having a diameter of 1 cm. The acidified brime solution was prepared by dissolving NaCl in distilled water with few drops of sulf...
Abstract: Solid waste management is critical issue faced by urban areas worldwide. The rapid increases of population size, urbanization and industrialization resulted in increased generation of solid wastes. Consequently, solid wastes and its management became major public health, environmental and socio-economic concern.This study aimed to investigatethe solid waste management system and associated risk factor of the environment, public health and socio economic aspects;in the case of Adama...