Design and Operation of Semi-Aerobic Landfill

Design and Operation of Semi-Aerobic Landfill

Mohd Suffian Yusoff (Universiti Sains Malaysia, Malaysia) and Mohd Faiz Muaz Ahmad Zamri (Universiti Sains Malaysia, Malaysia)
DOI: 10.4018/978-1-4666-9610-5.ch005
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Abstract

Landfilling is broadly recognized as a proper waste disposal method. Although ranked at the bottom of sustainable waste management hierarchy, final waste disposal technologies like sanitary landfill remain crucial for development country due to increasing waste generation. Since landfill is a permanent disposal site that could cause serious environmental pollution, a proper planning and development of landfill are important in avoiding problems in the future. In this chapter the general principles of landfill design and operation is given at the beginning. Then the following discussions were focusing on the design and operation of semi-aerobic landfill. The revision for design and operation of semi-aerobic landfill working phase were reported separately. Finally the summary of the discussion were given at the end of this chapter.
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Introduction

Solid waste management is a systematic practice of waste generation storage, collection, transport, treatment and disposal (Agamuthu, 2010). Sanitary landfill is one of the important methods for solid waste disposal in waste management system. Even though there are more advance disposal methods have been developed, the sanitary landfill remains as an ideal method for developing country (Idris & Hassan, 2004). The sanitary landfill is a final disposal method that treats and restores the organic portions of the waste to the nature which emphasizing the technical aspects like siting, design, operation and long-term environmental addeddment (Hans & Ramke 2001).

Unlike open dumpsite, the sanitary landfill is designed to deal with leachate, landfill gas and odor management. The collected wastes are handled at a disposal facility that is designed and operated at a constraint of public health and environment protection. The primary purpose of landfill site is to implement final disposal of the waste with minimum environmental impact. Besides, the sanitary landfill system can be classified based on decomposition process employed. Table 1 describes the characteristics of the landfill types.

Table 1.
Landfill classification system based on decomposition process employed
Landfill TypeCharacteristics
Anaerobic landfillSolid wastes are filled in dug area of plane field or valley. Waste is commingled with water in anaerobic condition.
Anaerobic sanitary landfill covered dailySolid waste is covered in a sandwich shape. Condition in solid waste is same as anaerobic landfill.
Improved anaerobic sanitary landfillLeachate collection system is installed at the bottom of the landfill site. Others are the same as anaerobic sanitary landfill. The conditions are still anaerobic but the moisture content is much less than anaerobic sanitary landfill.
Semi-aerobic landfill with natural ventilation and leachate collection facilitiesLeachate collection duct is bigger than the one of improved sanitary landfill. The opening of the duct is surrounded by air and the duct is covered with small crushed stones. Moisture content in solid waste is low. Oxygen is supplied to the solid waste from leachate collection duct.
Aerobic landfill with forced aerationThe leachate collection pipe and air supply pipes are attached. Air is forced to enter the solid waste causing it becomes more aerobic than semi-aerobic landfill.

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