DIRECT TREATMENT OF POLLUTED RIVER WATER BY THE MULTI-SOIL-LAYERING METHOD

摘要: Six Multi-Soil-Layering systems with combinations of two type soils, Andisol (volcanic ash soil) and Entisol (granitic sandy soil), particle size classes zeolite, 1-3 3-5mm in diameter, various hydraulic loading rates, 1 to 4 m3 m-2 day-1, were constructed compared for polluted river water treatment. Removal rates BOD, T-N T-P 72.2 83.5 %, 22.4 50.5 51.9 66.8 respectively. was more efficient removal than Andisol. Zeolite 1-3mm diameter all the pollutants that 3-5mm. These materials might contribute effective contact inlet components purification MSL systems. Lower rate BOD removal. The 2 day-1 most However, differences these among small considering rates. difference between 6 only 10 % against 400 them. Although clogging observed at system recovered after months rest. results indicated higher rate, advantageous practical direct