Operation And Maintenance Of Sewage Treatment Plant In Doha

The sewage treatment plant in Doha-South uses primary, secondary and tertiary treatment units for treating predominantly domestic sewage. The treated effluent, is used in irrigating agricultural farms for growing animal fodder and in landscape irrigation in Doha. The stabilized sludge is used as a soil conditioner. Samples are collected regularly at the plant inlet as well as before and after each treatment process. The raw sewage is characterized by high dissolved solids, medium strength BOD, low COD/BOD ratio, high concentration of chloride, sulphate and sulfide due to septic sewage. These are typical characteristics of the sewage in this region. The plant is designed, operated and maintained so as to ensure safety and reliability in the treated effluent quality. Any overloading of the treatment processes is handled effectively. The reclaimed • /ater quality meets the international standards and guidelines for landscape irrigation and farming. No evidence of disease amongst workers or the public has been observed from the water reuse

Qualitative And Quantitative Assessment Of Drained Water From Urban Ground-Water

Although the groundwater table in the State of Qatar peninsula is reducing, there is a persistent increasing level of groundwater in some areas in Doha city. This increasing tendency could be attributed to the topography of the area, geological structure, rapid urbanization, increase in water consumption, uncontrolled irrigation of farms and green areas as well as the absence of storm-water drainage system. To lower the groundwater table, a drainage system has been laid through Rayan and Wadi Musheirib which are the worst affected areas. This system drains away the groundwater as well as the stormwater to the Arabian Gulf. A qualitative and quantitative monitoring program was initiated in order to evaluate the possibility of utilizing this drained water. The results obtained indicate that the drainage water could be used for irrigating certain types of trees