ABSTRACT
The efficiency of inter-layer components of the Multi-Soil-Layering system for domestic wastewater treatment was investigated. The MSL system with different inter-layer components were set up in five 15 x 50 x 100 cm acrylic boxes. Soil was mixed with kenaf+corncob and iron scraps at the ratio of 75: 12.5: 12.5 based on dry weight. Soil mixture was filled into the boxes as blocks thus forming a brick layer-like pattern. Zeolite, zeolitized perlite, perlite, gravel and charcoal was used individually as the inter-layer component. Combined wastewater from cafeteria and toilet was discharged periodically into the MSL system. The MSL treatments were operated without aeration during Feb. - May 1999 and with on-off regulation of aeration during Jan. – Sep. 2000. The results during Feb. - May 1999 revealed that zeolite,