Effect of aerobic pretreatment of waste on the rate of anaerobic treatment processes
- PDF / 479,092 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 66 Downloads / 182 Views
ORIGINAL ARTICLE
Effect of aerobic pretreatment of waste on the rate of anaerobic treatment processes Monika Suchowska-Kisielewicz • Andrzej Jedrczak Zofia Sadecka • Sylwia Myszograj
•
Received: 24 May 2012 / Accepted: 5 November 2012 / Published online: 21 November 2012 The Author(s) 2012. This article is published with open access at Springerlink.com
Abstract The efficiency of waste degradation can be expressed by the rate of waste decomposition in individual phases. This article presents the durations of degradation phases of pretreated and untreated waste stabilized in anaerobic laboratory reactors. In this investigation, the quantities of organic and nitrogen contaminants emitted from the waste during the study are presented. The study confirmed the beneficial effects of aerobic pretreatment of waste before landfilling on reducing the duration of hydrolysis and acid phases, and speeding up the start of the stable methane phase. In the pretreated waste reactor, the stable methane phase began about 19 weeks earlier than in the untreated waste. The total amounts of contaminants removed from the aerobic pretreatment waste were lower than from untreated waste, with values of COD, TOC, BOD5, and VFA corresponding to 21, 18, 6, and 23 %, respectively, and values of TKN and NH4 of 7 and 50 %, respectively. Keywords Landfills Leachate Municipal solid waste Mechanical–biological treatment Reduction of emission potential
Introduction One of the major tasks of municipal waste management in the countries of the European Union is the systematic
M. Suchowska-Kisielewicz (&) A. Jedrczak Z. Sadecka S. Myszograj The Institute of Environmental Engineering, University of Zielona Gora, Licealna 9, 65-417 Zielona Gora, Poland e-mail: [email protected]
123
reduction of waste that is removed and transported to landfills. This refers particularly to biodegradable waste [1]. The presence of such waste influences the amount of emitted pollution via leachates and biogases into the environment. Poland adopted the landfill waste reduction targets of 25 % by 2010, of 50 % by 2013, and 65 % by 2020, in relation to the amount of landfill waste in 1995 [2]. One of the methods employed to decrease the amount of waste is mechanical–biological treatment (MBT) of the waste, before it is stored. The method has been recommended in The National Waste Management Plan 2010 as being useful for regions with populations of between 150,000 and 300,000 people. Mechanical–biological treatment (MBT) is a technology which consists of the use of the mechanical sorting of waste associated with the use of the biological stabilization of the remainder after sorting biodegradable waste. The mechanical sorting stage can be placed at the beginning of MBT (biostabilization) or after the biological process (biodrying). In biostabilization technologies, the waste is subjected to aerobic or anaerobic–aerobic stabilization in order to reduce its susceptibility to biodegradation. Stabilized waste is primarily suited for landfill,
Data Loading...
