| Abstrakt: |
Domestic wastewater with/without petroleum was treated by vertical flow constructed wetlands under different set-up designs and operation conditions. These conditions include different aggregate diameters, contact time, resting time, and chemical oxygen demand. The physical and chemical measurements of effluents were obtained. These measurements are total petroleum hydrocarbons, chemical oxygen demand, biochemical oxygen demand, ammonia-nitrogen, nitrate-nitrogen, ortho-phosphate-phosphorous, suspended solids, turbidity and pH. This research aims to find out which measures are significantly effective by using the subset selected regression model. The results showed that chemical oxygen demand, biochemical oxygen demand, ammonia-nitrogen have significantly effective (P < 0.05), and they have a direct effect on selection, which filter is the best choice. |
