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- Title
Environmental Sustainability Assessment of Zero-Waste System for Wastewater Recycling and Food Waste Management in Building.
- Authors
Sakcharoen, Thammanayan; Ratanatamskul, Chavalit; Chandrachai, Achara
- Abstract
Towards sustainable urbanization, food waste and wastewater from buildings need the appropriate infrastructure systems for management. The zero-waste concept is gaining interest as a promising option for the sustainable development of society. The study aims to assess the cumulative energy demand and GHG emissions of a prototype zero-waste system for building wastewater recycling and food waste management. The system is the combination of the Moving Bed Biofilm Reaction-Membrane Bioreactor (MBBR-MBR) for wastewater treatment and the anaerobic digester with energy recovery for food waste management. The functional unit is set as the management of 60 kg of food waste along with 2 m3 of building wastewater. The results revealed that the prototype zero-waste system could bring the negative fossil energy use (-96 MJ-eq) and the negative life-cycle GHG emissions (-4.4 kg CO2-eq/functional unit). The main credit came from the avoided fossil energy use and GHG emissions due to the substitution of LPG with biogas. The biogas generation was 0.00013 Nm3/mg COD removal (based on the hydraulic retention time (HRT) about 30 d). For anaerobic digestion system, pig slurry transport from the pig farm to the university as seed sludge and electricity consumption for the stirrer in the digester and the food waste shredder are the major sources of energy use and GHG emission. For the MBBR-MBR system, the primary source for both energy use and GHG emission is the electricity consumption for the air pump. The study shows the initial stage of the implementation of the prototype zero-waste, which there still has the potential to improve operational efficiency.
- Subjects
WASTEWATER treatment; INFRASTRUCTURE (Economics); SUSTAINABILITY; GARBAGE disposal units; ANAEROBIC digestion; ENERGY consumption
- Publication
CET Journal - Chemical Engineering Transactions, 2021, Vol 83, p343
- ISSN
1974-9791
- Publication type
Article