Sustainable Design of Wastewater Treatment Plant in Kibiligi Quater

摘要

Considering the millennium development goals (MDGs) and Rwanda vision, it's remarkable that Rwandan cities are growing at high rate which lead to the increase of population, the increase of population should go with the increase in sanitation infrastructures. Otherwise it results in practice of discharging wastewater directly into the bodies of water. This study is to estimate the quantity of wastewater (the effluent flow), to design a wastewater collection system, gravity sewer system design and to design an adequate horizontal sub-surface flow wetland for wastewater treatment system in kibiligi quarter. As results shown that the average daily water consumption per capital has been 96 liters which is in the standards limits and the higher usual is due to temporally activities like construction, the sewer pipe diameter found was below to the minimum recommended diameter of a sewer pipe therefore, we selected a convenient sewer pipe diameter, the average design influent flow has been 342m~3/day which has to be treated in a detention time of 2.42days in a constructed wetlands system, considering a minimum average annual temperature of 20°C for treatment efficiency.