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LEACHATE MANAGEMENT STRATEGIES AT LARGE TROPICAL LANDFILLS: A CASE STUDY

At tropical landfills, the demands on leachate management are often onerous and most acute in the initial stages of a landfill development. The daily and annual leachate generation rates can be very high, and leachate treatment can form a significant proportion of the landfill operating cost. Therefore, the development of an effective leachate management system is an essential part of the financial viability of a tropical landfill. Once the management system is developed, robust financial projections for leachate treatment throughout the life of a project can be derived. The Bukit Tagar landfill, near Kuala Lumpur, in Malaysia, illustrates the complexity of developing viable leachate management systems for tropical landfills, and highlights the importance of the relationships between the design, construction and operation.

Careful planning of leachate management is important at all landfills but is especially so at many tropical locations. This is because: (i) the contribution to base flow from the incoming wastes may be high, (ii) tropical storms can easily generate several tens of thousands of cubic metres of excess leachate in short periods and (iii) acetogenic conditions can greatly reduce the volumetric capacity of leachate treatment plants just when it is most needed. These challenges can be met successfully but to do so it is essential to have a strategy that includes: 1. A realistic model for predicting daily flows at times of peak rainfall, thereby deriving combinations of design flow rate/buffer storage capacity that will cope; 2. Covering of intermediate areas with geomembrane, far more rigorously and extensively than at non-tropical locations, to minimise the exposed area; 3. Large seasonal buffer storage to manage the peaks from extreme events; 4. Planning the timing of new phases for the driest times of year; 5. A plan for the management of acetogenic leachate (seeding, recirculation, timing, long retention buffer storage). This paper describes these issues with particular reference to the large Bukit Tagar landfill in Malaysia.

Copyright:	© IWWG International Waste Working Group
Source:	Specialized Session C (Oktober 2007)
Pages:	10
Price inc. VAT:	€ 0,00
Autor:	Jeremy Eldridge Keith Knox Simonne Eldridge Bryan Richards Tony Kortegast
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