การศึกษาใช้ธูปฤาษี (Typha angustifolia Linn.) บำบัดน้ำเสียชุมชน
This study was aimed to examine the efficiency for treatment of domestic wastewater and the growth of cattail (Typha angustifolia Linn.) while being used for treatment of domestic wastewater in Nonthaburi province. The domestic wastewater under study was that from a real estate village. The cattail plants used for treatment of domestic wastewater were planted in planting spaces of 30x30, 35x35, and 40x40 centimeters respectively. Four levels of wastewater concentrates were studied, namely, 0.00 percent, 25.00 percent, 50.00 percent, and 100 percent; and three planting durations were studied, namely, 45, 60, and 90 days. Research findings showed that the cattail plants grew as shown by the increase in their height, weight of the plant, weight of the roots, and weight of the biomass in all durations of planting. The best wastewater concentration that made the cattail grow at the highest rate was that of 25.00 percent and the best planting spaces were those of 30x30 and 35x35 centimeters. As for nutrient absorption of the cattail, it was found that the best wastewater concentration that enabled the cattail to absorb nutrients at the highest rate was that of 25.00 percent. The cattail planted for 45 days was found to have the highest level of efficiency for wastewater treatment. The cattail plants in the 30x30 centimeters planting space could reduce the BOD value of wastewater by 58.53 percent, and the total carbon content by 58.53 percent; while those planted in the 35x35 centimeters planting space could reduce the total nitrogen content by 39.70 percent and the total phosphorus content by 61.58 percent. Therefore, the cattail was found to be a good agent for treatment of domestic wastewater. It was recommended that the cattail should be applied to treat domestic wastewater in Nonthaburi province which was a high quality residential area with a large number of real estate villages. The cattail plants could be planted in experimental plots with the best planting spaces of 30x30 and 35x35 centimeters and they should be pruned to prevent them to have flowers in the 90th day after planting because after flowering they would grow new shoots and stop growing new leaves resulting in stagnant of growth which would reduce their efficiency for wastewater treatment.