การบำบัดฟอสฟอรัสจากน้ำทิ้งโรงงานสกัดน้ำมันปาล์มโดยการบำบัดโดยดิน

Abstract

This research aims to study phosphorus removal efficiency from palm oil mill effluent using land treatment by slow-rate irrigation which will be an alternative to reuse palm oil mill effluent using land treatment. Soil samples and palm oil mill effluent from palm oil mill factory were used for this study. This study was conducted in soil column for lab scale with 2 experiments. The first experiment used synthesis wastewater at different pH 5, 7 and 9 with various hydraulic loading rates 3, 2, 1 and 0.5 cm/week, respectively. The result showed that hydraulic loading rate 2 cm/week with pH 7 was optimum condition to remove phosphorus. The second experiment used palm oil mill effluent at hydraulic loading rate 2 cm/week with pH 7. The result showed that soil can remove phosphorus in wastewater. The residual phosphorus was reduced from 1.33 mg/L to 0.12 mg/L (91%). Characteristic of soil before and after experiments showed that there was no change of soil texture. pH 6.05 of soil make the soil valuable of Fe-phosphate and Al-phosphate which was higher than Ca-phosphate and available phosphorus was 25 mg/kg that is suitable for agriculture. Therefore, land treatment is a natural process which is suitable for phosphorus removal.