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In some areas, compacted clay liner is chosen as leachate barrier for solid waste landfill. Due to the typical shape of the landfill, the compacted clay liner will be rested both in flat and sloping ground. Since clay has characteristics of low shear strength, improvement of shear stability of compacted clay liner is required. One of the stability methods to increase the shear strength of clay is by adding another material which has higher shear stability. In this study, bentonite is used to represent clay liner while zeolite is utilized as stabilizer material. Four compositions of bentonite with 0%, 5%, 10%, 15% addition of zeolite were prepared to investigate the stability performance of the mixtures. The results indicate that the addition of zeolite into bentonite has increased the friction angle of the bentonite. However, the addition of zeolite seems to alter the hydraulic performance of bentonite. The highest permeability is demonstrated by the bentonite with 15% of zeolite. Whether the permeability increases, the hydraulic performance of all the mixtures are still met the maximum permeability allowed for landfill liner.

An investigation on the use of landfill bioreactors was conducted to elaborate an alternative solution on the municipal solid waste management in Jatibarang Landfill, Semarang. In addition, this study is also trying to develop a prevention on leachate and greenhouse gases pollution which are potentially emits from a landfilling process. There are six landfill bioreactors that were constructed for this study, which consist of two anaerobic bioreactors (R1 and R2) and two aerobic bioreactors (R3 and R4). Leachate recirculation was applied on R1 and R2 since the leachate production began while R3 and R4 was given air injection with 2 l/min flow rate. R1 and R2 maintained its thermophilic phase longer and generated more methane gases than aerobic bioreactors. Meanwhile, both aerobic bioreactors reached the thermophilic phase on day-7, faster than the anaerobic bioreactors.

Landfilling is one of the easiest methods to be applied in the management of municipal solid waste (MSW). In its development, bioreactor landfill methods that have various advantages over conventional landfill emerge. This experiment aims to study the use of bioreactor landfills for the management of organic waste in Jatibarang Landfill, Semarang-Indonesia. There are 4 bioreactor landfills operated: 2 anaerobic bioreactors with leachate recirculation and addition of water, and 2 aerobic bioreactors. Different results are shown from these two types of bioreactor, where aerobic bioreactors reach peak temperatures (55oC each) faster even though anaerobic bioreactors reach higher temperatures (60oC and 61oC respectively). Anaerobic bioreactors reach a higher final pH value than aerobes while the accumulation of nitrogen content from an aerobic bioreactor is 2 times higher than anaerobes.