Animal Manures: Recycling and Management Technologies

Changes in microbial properties and community composition in acid soils receiving wastewater from concentrated animal farming operations

“…However, less is known about the responses of the soil microbial community in soils receiving wastewater. The wastewater of concentrated animal farming operations is richer in small molecular weight organic matters than solid manure due to the hydrolysis and fermentation of complex polymers in the digestion process (Gómez-Brandón et al, 2013). Consequently, the application of wastewater may exert different effects on soil properties compared to other types of animal manure.…”

The Analysis of the Economic Effects on the Greening and Recovery of the Sludge Waste Resulting from the Biogas Production Activity

“…The oxygen intake in the fermentation mass is ensured by the frequent return of the compost layer with the help of a special mechanism. The humidity of the reaction mass must be controlled during the process and this is done by irrigation with the return operation [72,73]. If by precipitation or other causes the water content increases significantly, part of it can be removed in a contaminated water collector from where it is again used for subsequent humidification.…”

“…The biological process for the generation of humid substances continues, but at a much lower rate and the emissions are reduced to a minimum [74]. The final stabilization of the compost is achieved when the compost temperature is kept constant below 30 • C. The total duration of a composting cycle for sludge at the biogas plant is at least six months under ideal conditions [71][72][73][74]. The formation of compost is influenced by the following factors [67,75]: (i) Water-the lack of water blocks the activity of the microorganisms and the decomposition process.…”

“…this is done by irrigation with the return operation [72,73]. If by precipitation or other causes the water content increases significantly, part of it can be removed in a contaminated water collector from where it is again used for subsequent humidification.…”

Dynamics of soil nitrogen availability indices in a sandy clay loam soil amended with animal manures

“…Hence, the potential of animal manure use in soil replenishment has received the global attention. Currently, to many soil fertility difficulties, animal manures offer an affordable and readily available solution (Spore 2006) and are important source of Ca, Mg, S and micronutrients (Gomez-Brandon et al 2013); they contain low and highly variable amounts of N, P and K. Aside from being source of plant nutrients, the physical properties of soil are also improved (Akanni and Ojeniyi 2008). However, the use of animal manures can pose a major problem of excess nitrate in soil (Azeez and Van Averbeke 2010b;Navarro Pedreno et al 1996).…”