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Titolo:
Cost-benefit analysis of introducing technology to rapidly degrade municipal solid waste
Autore:
Clarke, WP;
Indirizzi:
Univ Queensland, Dept Chem Engn, CRC,Queensland Node, Waste Management & Pollut Control Ltd, Brisbane, Qld 4072, Australia Univ Queensland Brisbane Qld Australia 4072 Brisbane, Qld 4072, Australia
Titolo Testata:
WASTE MANAGEMENT & RESEARCH
fascicolo: 6, volume: 18, anno: 2000,
pagine: 510 - 524
SICI:
0734-242X(200012)18:6<510:CAOITT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC FRACTION; LANDFILLS;
Keywords:
anaerobic composting; Australian waste management; bioreactor landfill; economic analysis; invessel digestion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
--discip_BC--
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Clarke, WP Univ Queensland, Dept Chem Engn, CRC,Queensland Node, Waste Management & Pollut Control Ltd, Brisbane, Qld 4072, Australia Univ Queensland Brisbane Qld Australia 4072 ld 4072, Australia
Citazione:
W.P. Clarke, "Cost-benefit analysis of introducing technology to rapidly degrade municipal solid waste", WASTE MAN R, 18(6), 2000, pp. 510-524

Abstract

Due to an increasing awareness of the true economic and environmental costof conventional landfilling, recent interest has developed in Australia intechnologies that accelerate the degradation of the organic fraction of municipal solid waste (MSW). The management of the organic waste stream, which typically makes up 60 to 70% of MSW in Australia, is central to reducing the reliance on landfill space. One option is to digest the organic fraction prior to landfilling, or preserve landfill space by accelerating the decomposition of the organic fraction within the landfill, This paper quantifies the benefits of digestion as a function of the degradation time, rd. The analysis considers both invessel and landfill-based bioreactor technologiesand calculates net economic impact, expressed as $US t(-1) MSW, as the sumof enhanced and more rapid biogas retrieval, saved landfill space, reducedenvironmental disamenity and reduced postclosure costs, minus the capital and operating costs to implement the technology. The benefits, on a per tonne basis, are shown to be insensitive to the size of the waste stream whilecosts diminish as the waste stream size increases. A conventional landfillwith t(d) = 20 yr is used as a basis of comparison. At 1800 t day(-1), themaximum level of benefit is 13 $US t(-1) at t(d) = 2 months, diminishing monotonically to zero at t(d) = 20 yr. The cost of achieving t(d) = 2 monthsis the cost of invessel digestion, estimated to be 99 SUS t(-1), resultingin an overall increase of 86 $US t(-1) in waste management costs. Similarly, degradation times of 2 < t(d) < 5 yr provide a benefit of 8 to II $US t(-1) for a waste stream of 1800 t day(-1). This rate of degradation can be achieved with landfill-based bioreactor technology. The cost of additional infrastructure needed to implement accelerated degradation, such as pretreatment pads, internal leachate distribution networks and additional gas wellsand generators, is estimated to be less than I $US t(-1). Bioreactor technology is therefore appealing, although their is uncertainty about the additional operating costs needed to Nn a landfill as a bioreactor. Additional operations would mainly revolve around segmenting the waste mass to tightly control leachate distribution. The cost of these additional operations are unlikely to exceed the operating cost of a modem conventional landfill, estimated at 9 $US t(-1). Therefore, landfill bioreactor technology should be cost effective.

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Documento generato il 18/01/20 alle ore 10:47:00