Study the Effect of Dry Fermentation of Goat Manure in Optimization of Biogas Production and Minimization of Costs

Abstract

In this study the effects of temperature, fermentation type and hydraulic retention time were investigated to optimize biogas yield and minimize production costs under lab scale for batch anaerobic digestion of goat manure. The growth and activity of anaerobic microorganisms is influenced by some parameters like temperature, moisture content, pHvalue and volatile fatty acids (VFA), which were measured before the study. The methane values were between (61.89 -69.35%). A cost equation was determined to calculate the total biogas cost LE/liter at different conditions. The minimum biogas production cost was 4.09 LE/liter at the highest cumulative production of 128.74 liter at temperature of 60 °C for dry fermentation.

Cellulolytic Bacteria as Decomposers in Dry Empty Fruit Bunches Composting

“…According to [19] microorganisms in the composting process are divided into two types: mesophilic microorganisms that can live at temperatures ranging from 10-45 o C and thermophilic microorganisms that can live at temperatures ranging from 45-65 o C. Figure 1 shows that there was no thermophilic temperature in this study, which is presumably due to the fact that the height of the EFB compost pile is only 25 cm and the compost is always turned over every 5 days during composting to maintain the water content at 60-50% as a result, the thermophilic temperature in the compost does not last long. The same results were obtained in research [20] on dry leaf composting, which produces a temperature of 41 o C with a pile height of ±50 cm. The decrease in temperature at the end of composting is due to a decrease in microorganism activity in overhauling organic matter.…”

Recycling rice straw ash to produce low thermal conductivity and moisture-resistant geopolymer adobe bricks

“…( Yuan et al, 2014 , Bamminger et al, 2018 , Buyondo et al, 2020 , Nan et al, 2020 ). However, the straw is used for feeding animals, mushroom farming, and biofuel production ( Foaud and Abdelradi, 2016 , Babé et al, 2020 , Mohamed and Morsy, 2018 , Mohamed and Morsy, 2020 , Hassan et al, 2021 , Phuong et al, 2021 ). Rice straw ash (RSA) is the main source of silica (87–97%) used as a building material.…”