Long-term emissions from mechanically biologically treated waste: Influence on leachate quality - Part II

 

 

C Trois; M Griffith

CRECHE - Centre for Research in Environmental, Coastal and Hydrological Engineering, School of Civil Engineering, Survey and Construction, University of KwaZulu-Natal, Durban, South Africa

Correspondence

 

 

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ABSTRACT

Mechanical biological pretreatment of waste prior to disposal is proven to effectively reduce the long-term polluting potentials of landfilled waste. The combined effect of waste pretreatment and flushing, as is possible in landfills operated in tropical or sub-tropical countries, has the potential to further reduce the landfills' environmental impact. In this study, long-term emissions from pretreated waste were monitored in anaerobic leaching columns operated at increasing liquid-to-solid ratios. The efficiency of the pretreatment, conducted in full-scale passively aerated windrows, was assessed by comparing different treatment periods (8 and 16 weeks). In order to understand the influence of sorting (separated collection) on the pretreatment, the treated waste was sieved in a 50mm diameter sieve and the coarse and fine fractions separately analysed in the leaching columns. The results showed that treating the waste markedly reduces the COD and NH₃-N loadings while the coarse fractions show a greater long-term pollutant risk.

Keywords: mechanical biological waste treatment, flushing, leaching columns, bioreactor landfill, leachate

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References

BOWERS A (2002) Characterisation and Management of Landfill Emissions Under A Sub-Tropical Climate Using Full-Scale Landfill Cells. M.Sc. in Engineering Dissertation, University of Natal, Durban, South Africa.         [ Links ]

COSSU R and ROSETTI D (2003) Pilot scale experiences with sustainable landfilling based on the PAF conceptual model. In: Proc. Sardinia 2003, 9^th Int. Waste Management and Landfill Symp. 1-5 October, Santa Margherita di Pula, Cagliari, Italy.         [ Links ]

GRIFFITH M and TROIS C (2005) Effects of waste pre-treatment on landfill emissions under a subtropical climate. In: Proc. Sardinia 2005, 10^th Int. Waste Management and Landfill Symp. 3-7 October, Santa Margherita di Pula, Cagliari, Italy.         [ Links ]

GRIFFITH M and TROIS C (2006) Long-term emissions from treated waste: Influence on leachate quality. Water SA 32 (3) 307-313. http://www.wrc.org.za/downloads/watersa/2006/Jul%2006/1971.pdf        [ Links ]

KUEHLE-WEIDEMEIR M and DOESENS H (2003) Landfilling and properties of MBP waste. In: Proc. Sardinia 2003, 9^th Int. Waste Management and Landfill Symp. 15 October, Santa Margherita di Pula, Cagliari, Italy.         [ Links ]

MARCHETTI R (2007) Long Term Emissions from Treated Waste: Column Studies. M.Sc. in Engineering Dissertation, University of KwaZulu-Natal, Durban, South Africa.         [ Links ]

MOLLEKOPF N, BRUMMACK J, PAAR S and VORSTER K (2002) Use of the dome aeration technology for biochemical stabilization of waste prior to landfilling. In: Proc. Wastecon 2002, International Waste Congress and Exhibition. October 2002. Durban, South Africa.         [ Links ]

PAAR S, BRUMMACK, J and GEMENDE B (1999) Mechanical-biological waste stabilization by the dome aeration method. Environ. Prot. Eng. 25 (3) 99.         [ Links ]

ROBINSON HD, KNOX K, BONE, BD and PICKEN A (2005) Leachate quality from landfilled MBT waste. Waste Manage. 25 383-391.         [ Links ]

SOYEZ K, THRAN D, VOLKER D and KOLLER M (2002) Biological pre-treatment. In: Proc. Wastecon 2002, International Waste Congress and Exhibition. October 2002. Durban, South Africa.         [ Links ]

TROIS C and POLSTER A (2007) Effective pine bark composting with the dome aeration technology. Waste Manage. 27 (1) 96-105.         [ Links ]

TROIS C, GRIFFITH M, BRUMMACK J and MOLLEKOPF N (2007) Introducing mechanical biological waste treatment in South Africa: A comparative study. Waste Manage. 27 (11) 1706-1714.         [ Links ]

US STANDARD METHODS (2004) American Standard Methods for the Examination of Water and Waste Water (20^th edn.) American Water Works Association (AWWA).         [ Links ]

 

 

 Correspondence:
+2731 260-3065
Fax: +2731 260-1411
E-mail: troisc@ukzn.ac.za

Received 16 October 2007;
Accepted in revised form 17 June 2008.