Current anaerobic digestion technologies used for the by California Integrated Waste Management Board (CIWMB)

By California Integrated Waste Management Board (CIWMB)

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Extra info for Current anaerobic digestion technologies used for the treatment of municipal organic solid waste [Electronic resource]: contractor's report to The Board

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The size of the system was not mentioned, but developers claimed that it would provide two-thirds of the energy produced by the solid waste combustion plant operating at the time. The plant would have cost $50 million and was prepared to charge the city $30 per MT ($27 per ton) of garbage treated. The proposal was rejected in favor of a “transfer and disposal” plan which would transport the garbage out of the county [103]. Contractor’s Report to the Board 44 A 2004 feasibility study by the consulting agency RW Beck concluded that the installation of an anaerobic digester to treat solid waste in Linn County, Iowa, could be financially viable [104].

Mixing is accomplished by recycling digestate during feeding, which requires cement pumps capable of handling the thick slurry. Figure 14. Valorga digesters SIVOM plant in Varennes-Jarcy, France (left); Mons, Belgium (right). Waste Recovery Systems, Inc. (Steinmüller Valorga process 8 ) The Valorga process was developed in 1981 to treat organic solid waste and accepts MSW after appropriate separation of the recalcitrant fraction [44]. A high-solids digester is fed with OFMSW that has 25-30 percent TS content adjusted using steam for heating and process water for diluting the incoming feed as needed [44].

2002) recommended that the initial AD treatment last 25 days but suggested that the retention times could be adjusted as needed to lend flexibility to the process. One of the primary advantages of the technology is the high quality of the treated solids when used as a planting medium. The extended length of digestion and additional financial and energy costs of the pressurized steam treatment unit are potential disadvantages, but some of these costs could be offset by the additional biogas production and higher price earned for the peat-like end product.

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