Anaerobic digestion composting

Different biological processes used for the treatment of wastes are activated sludge, aerated lagoons, anaerobic digestion, composting enzyme treatment, trickling filter, and waste stabilization ponds. 

Recovery of Riologieal Conversion Products Biological conversion produces that can be derived from solid wastes include compost, methane, various proteins and alcohols, and a variety of other intermediate organic compounds. The principal processes that have been used are reported in Table 25-64. Composting and anaerobic digestion, the two most highly developed processes, are considered further. The recovery of gas from landfills is discussed in the portion of this sec tion dealing with ultimate disposal. 

Keywords Agronomic value of composting Anaerobic digestion Biowaste Compost quality Composting process Maturity... 

Maturity is an important parameter for the nutrient management of compost N availability in compost is closely related to the maturity reached during composting (Bemal et al. 1998 Griffin and Hutchinson 2007). Larsen et al. (2007) found that anaerobically digested and composted municipal solid waste immobilized N in the initial stage of decomposition. The N immobilization in the composted municipal... 

Larsen T, Luxhoi J, Magid J, Jensen LS, Krogh PH (2007) Properties of anaerobically digested and composted municipal solid waste assessed by linking soil mesofauna dynamics and nitrogen modeling. Biol Fertil Soils 44 59-68... 

Turk T, Kern M (2008) Anaerobic digestion plants connected upstream of composting plants. ECN/ORBIT Workshop, Numberg... 

Biogas can be used after appropriate gas cleanup as a fuel for engines, gas turbines, fuel cells, boilers, industrial heaters, other processes, or for the manufacturing of chemicals. Before landfilling, treatment or stabihzation of biodegradable materials can be accomplished by a combination of anaerobic digestion followed by aerobic composting. 

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