Use Of a Novel Bioreactor Configuration in The Form of High Solid Digestion for Municipal Organic Wastes at Pilot Scale

Year 2017, Volume: 2 Issue: 1, 120 - 125, 25.02.2017

Kubra Arslan

Abstract

The objective of this study
was to investigate the performance and process stability of a novel dry
anaerobic digestion system. For this purpose, a dry anaerobic digester (100 L)
with percolate tank (200 L) was designed at pilot scale. Municipal solid wastes
were fed into the dry fermentation unit and system was operated with
intermittent recycling of leachate through percolation unit back to the dry
fermentation unit twice a day. Gas production in both unit was recorded daily
and gas content and leachate analysis were carried out periodically. A batch
feeding of solid waste (17.5 kg waste) having less than 5 cm particle size with
a dry matter of 13% and organic dry matter of  85%  was
carried out and process was operated for 60 days. Results indicated that 560 L
methane per kg organic dry matter was produced. This corresponds to biogas
production 119 m³ per ton of wet solid waste. It was also observed
that the main gas production took place in percolate tank and the solid
digester acted as a hydrolysis and acid reactor indicated by the low gas
production and acidic leachate characteristics. There were also almost no
digestate generation which eliminates costly post treatment units before the
discharge of digestate, which is a critical problem for wet digestion
counterpart. 

Keywords

Anaerobic digestion, high solid fermentation, methane, municipal solid waste

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