Premium
A comparison of wet and dry anaerobic digestion processes for the treatment of municipal solid waste and food waste
Author(s) -
Angelonidi Eleni,
Smith Stephen R.
Publication year - 2015
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12130
Subject(s) - digestate , anaerobic digestion , biogas , raw material , waste management , food waste , environmental science , total dissolved solids , municipal solid waste , biomass (ecology) , valorisation , energy balance , waste treatment , renewable energy , environmental engineering , engineering , methane , chemistry , agronomy , ecology , organic chemistry , biology , electrical engineering
A main distinction between anaerobic digestion (AD) technologies for treatment of municipal and industrial biodegradable wastes is the operating process solids content. Wet AD systems operate at low total solids (<10–20% TS) and dry systems have high operating solids (20–>40% TS). The performance of wet and dry AD systems was quantified in relation to: technical operation (footprint, capacity, feedstock characteristics, pretreatment and post‐treatment, retention time, water usage), energy balance (biogas productivity, parasitic energy, methane [CH 4 ] content, utilization of biogas and produced energy), digestate management and economic performance (capital and operational costs, revenues, specific capital costs [per t of waste and per m 3 biogas]). Wet AD plants had improved energy balance and economic performance compared to dry AD plants. However, dry AD plants offered several benefits, including greater flexibility in the type of feedstock accepted, shorter retention times, reduced water usage and more flexible management of, and opportunities for marketing, the end‐product.