Application of food waste disposers and alternate cycles process in small-decentralized towns: A case study
- 28 February 2007
- journal article
- research article
- Published by Elsevier BV in Water Research
- Vol. 41 (4), 893-903
- https://doi.org/10.1016/j.watres.2006.11.023
Abstract
The use of food waste disposers (FWDs) can be an interesting option to integrate the management of municipal wastewaters and household organic waste in small towns and decentralized areas. This strategy can be even more environmentally friendly if a suitable treatment process of the resulting sewage is performed in order to control nutrients emission. However, still nowadays, part of the scientific and technical community considers the application of this technology a possible source of problems. In this study, the FWDs were applied, with a market penetration factor of 67%, in a mountain village of 250 inhabitants. Further, the existing wastewater treatment plant (WWTP) was upgraded by applying an automatically controlled alternate cycles process for the management of nutrients removal. With specific reference to the observed results, the impact of the ground food waste on the sewerage system did not show particular solids sedimentation or significant hydraulic overflows. Further, the WWTP was able to face the overloads of 11, 55 and 2 g per capita per day of TSS, COD and TN, respectively. Then, the increase of the readily biodegradable COD (rbCOD/COD from 0.20 to 0.25) and the favourable COD/TN ratio (from 9.9 to 12) led to a specific denitrification rate of some 0.06 kg NO3-N/(kg MLVSS day). Therefore, not only COD removal, but also the total nitrogen removal increased: the denitrification efficiency reached 85%. That led to a better exploitation of the nitrogen-bound oxygen and a consequent reduction of energy requirements of 39%. The final economic evaluation showed the benefits of the application of this technology with a pay back time of 4–5 years.Keywords
This publication has 11 references indexed in Scilit:
- The effect of food waste disposers on municipal waste and wastewater managementWaste Management & Research: The Journal for a Sustainable Circular Economy, 2005
- The under sink garbage grinder: A friendly technology for the environmentEnvironmental Technology, 2003
- An Automatically Controlled Alternate Oxic−Anoxic Process for Small Municipal Wastewater Treatment PlantsIndustrial & Engineering Chemistry Research, 2003
- Addition of an External Carbon Source To Enhance Nitrogen Biological Removal in the Treatment of Liquid Industrial WastesIndustrial & Engineering Chemistry Research, 2002
- Analysis of sludge management parameters resulting from the use of domestic garbage disposersWater Science & Technology, 2001
- Development of a new system for control and optimization of small wastewater treatment plants using oxidation-reduction potential (ORP)Water Science & Technology, 1998
- Treatment of domestic wastewater mixed with crushed garbage and garbage washing water by advanced gappei-shori johkasoWater Science & Technology, 1997
- Waste design for households with respect to water, organics and nutrientsWater Science & Technology, 1997
- A rapid physical-chemical method for the determination of readily biodegradable soluble COD in municipal wastewaterWater Research, 1993
- Combined Pre-Precipitation, Biological Sludge Hydrolysis and Nitrogen Reduction - A Pilot Demonstration of Integrated Nutrient RemovalWater Science & Technology, 1992