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Journal of Biotechnology and Phytochemistry| Volume: 2
December 03-04, 2018 | Dubai, UAE
Recycling and Waste Management
6
th
International Conference on
Electric energy production from primary sieved solids through gasification
Petros Gikas
and
Anthoula Manali
Technical University of Crete, Greece
M
icro-sieving is a novel rotary belt filtration process, which
separates suspended solids (SS) from raw wastewater.
The openings of the belt filter are typically between 150-350
μm, however, the filtration is primarily based on the cake that is
formed on the belt, due to the accumulation of the separated
SS (which are continuously removed through a scrubbing
device). SS removal yield, for municipal wastewater has been
measured between 30-50%, with parallel BOD reduction of
about 20-30%. The produced biosolids (Primary Sieved Solids-
PSS) have solids content between 35-45% and High Heating
Value (HHV) between 23.5-24.4 MJ/kg, and thus they are ideal
for gasification. However, additional drying is required, prior to
gasification, to achieve solids content of about 85%. A complete
system is under installation at the Wastewater Treatment
Plant of Re-thymno, Greece. Initially, about 5000 m3/d of raw
wastewater, will be treated by micro-sieving. The produced
PSS will be further dried and then will be gasified to produce
syngas. The latter will be fed into a co-generation engine for
the production of thermal energy (will be used for PSS drying)
and electric energy. Based on mass and energy balances, the
produced electric energy will be sufficient to operate the
system: micro-sieving-drying-gasification, while excess electric
energy is expected to be produced. An additional benefit,
apart from the energy production, is the enhancement of the
performance of the downstreamWWTP, due to the removal of
a large fraction of SS from the wastewater, prior to the aeration
tank. The study is supported by the European Commission,
through the LIFE program: “New concept for energy self-
sustainable wastewater treatment process and biosolids
management (LIFE B2E4SustWWTP)”, LIFE16 ENV/GR/000298.
Speaker Biography
Petros Gikas is Associate Professor at the School of Environmental Engineering,
Technical University of Crete, Greece, and Director of the “Design of Environmental
Processes Laboratory”. His research interests are focused on municipal, industrial
and agricultural waste and wastewater management. He is specifically active in the
design of novel wastewater treatment processes, with emphasis in low cost – low
energy treatment processes and on water reclamation and reuse applications. He is
also working on energy recovery from biosolids and municipal solid waste, utilizing
thermal or biological processes. He has over 50 publications and over 100 conference
participations, while he is Associate Editor for the Journal of Environmental Management.
e:
petros.gikas@enveng.tuc.gr