Pemanfaatan Limbah Padat (fly ash) untuk Mencegah Cemaran Mikrobiologis dan Kimiawi Sampah Kota pada Ekosistem Rawa

Abstrak

The research on the utilization of solid waste (fly ash) has been conducted to avoid the further effect of microbial and of the municipality solid waste in the wetland ecosystem. The purpose of this research is to utilize the fly ash, the solid waste of the PLTU industry, as protective layer (geosynthetic liners/GCLs) at waste disposal areas in order to avoid microbial and chemical pollution to the environment. During the research, ponds with 6x6x4 m in size was added with GCLs (layer of 30 sacs of fly ash 25 kg/sac at each 2 meters of pile waste) and a control pond. The result shows that fly ash with the composition of SiO₂ (42,92 %) and AlO₂  (29,45%) can be utilized as a protective layer (geosynthetic liners), because after 3 weeks it can minimize the contamination of bacteria (total decrease of coliform bacteria > 50%) to the environment, and also reduce some toxic compound, especially heavy metal such as Pb (30,1%) and Cu (43,54%), and the content of nitrate (32,1%). Hence fly ash has economic and ecological values as a protection layer at the solid waste disposal area to avoid the environmental contamination of bacteria’s and chemicals.