Abstract
This study was conducted in order to define the actual conditions and the characteristics of the lanned reuse of the treated wastewater from rural sewerage for irrigation. This study was carried out with the data of 18 rural sewerage and 4 public sewerage. Main findings were described below. 1) The main purpose of the utilization of treated wastewater was the prevention of the irrigation water shortage. Fertilizer effect of the treated wastewater and the water purification function in the farmland were not considered. 2) The treated wastewater was mainly utilized for paddy fields. However, the treated wastewater was also used for many kinds of field crops. Many treatment plants utilized the treated effluent for the plural kind of crops. 3) In many cases, the treated wastewater was used throughout the irrigation season every year, not only in the drought years. 4) The sending systems of the treated wastewater for the farmland were very diverse, especially with the small treatment plants. 5) The planning conditions of treated wastewater were determined in accordance with the usual standards of rural sewerage or usual regulations for general treatment plants without the wastewater reuse. 6) A wide variety of wastewater treatment systems was employed in rural sewerage. In this study, the problems for the actual conditions of the reuse systems of rural sewerage were also examined.
