Investigating the Suitability of Treated Sewage Water for Agriculture in Hawassa, Sidama Region, Ethiopia

Abstract

This study is based on the quality of wastewater from Hawassa University surroundings, which was assessed to determine its suitability for irrigation purposes. Grab samples of influent and the treated water was taken for assessing quality parameters. The study revealed that the treated water could be used for irrigation purposes with some moderate restrictions. Even though EC and TDS permit to irrigate fruit trees and fodder crops, there is a risk of soil degradation due to the high value of SAR. Results also indicated that carbonate, potassium and phosphate exceeded the specified limits for wastewater reuse in agriculture. Despite increased nutritive elements, continuous use of treated sewage water for irrigation will make the soil acidic. Analysis of soil parameters indicated that there is an increase in nitrogen, phosphate and potassium nutrient levels considerably to benefit crop production but an increase in soil EC is a serious concern.