DOI: 10.5593/SGEM2015/B41/S17.069


A. M. Bors, I. Meghea, M. Mihaly, M.N. Badea
Friday 25 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-38-4 / ISSN 1314-2704, June 18-24, 2015, Book4, 533-540 pp

The environmental pollution is a major concern and the global warming a special one, so that the development of effective and non-expensive treatment technologies is required. Large amounts of waste and sludge are landfilled and the degradation of organic substances in landfills results in carbon dioxide and methane emissions. If sludge is to be stored untreated on landfills this would further exacerbate the greenhouse effect, as pollutant landfill gas would be emitted into the atmosphere over decades. The impact from carbon dioxide emissions can be minimized by substituting fossil fuel with biogas from digesting sewage sludge and municipal organic waste. Sustainable use of municipal organic waste and sewage sludge requires recycling resources, thus avoiding the harmful impact on humans and the environment.
The present paper aims to describe the waste and sludge sources in Romania but also the possible alternatives to capitalize them. According to the National Action Plan regarding the renewable energy, the Romanian target until 2020 is 24 % of the total energy consumption. Previous studies showed that important amounts of valuable energy could be recovered from the domestic sludge and manure generated in the rural area of Romania. The main advantages of sustainable use of sludge and waste are: conversion into combustible biogas (the production of renewable energy), the possibility of the independent supply of the wastewater treatment plants with energy (reduced operating costs), a smaller carbon footprint, reduction of the volume of malodorous substances emitted, sludge hygienisation (including bacteria reduction), and climate protection through an improvement in the CO2 balance of the treatment plant.

Keywords: renewable energy, biogas, carbon footprint, sludge, sustainable use