Abstract
A septic tank and soil absorption system (SAS) is a simple means of treating domestic wastewater using the filtration, sedimentation, chemical absorption, and biological characteristics of soil. Data obtained from countries, such as the United States and Australia, where on-site wastewater treatment is common, suggests that SAS have become a main application for on-site treatment. In this research, the performance of SAS was investigated through an outdoor pilot study and two laboratory tank studies. The treatment capacity of the outdoor pilot plant was 1.5 m3 ∕day , and used alternating anaerobic and aerobic units. The objective of the pilot study was to verify the occurrence of nitrification and denitrification in the system. In the tank study, the first setup utilized capillary and siphonage mechanisms to change wastewater distribution within the filter bed. The effect of wastewater distribution on hydraulic loading, pollutant removal, and system reliability were then investigated. In the second setup,...
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