تطوير محطة تجريبية لتقيم محطة معالجة مياه كربلاء، العراق .

DEVELOPMENT OF A PILOT STATION FOR EVALUATING KERBALA WATER TREATMENT PLANT,IRAQ.

The development and a improve efficiency of water purification plant in Kerbala was investigated.
Research mechanisms were established to improve the efficiency of the station production in terms of quality and quantity to meet the standard requirements to be developed within locally and accepted alternatives.
The study has addressed theoretical analysis and a series of previous tests results through data available at the station from 2014-2019. The model was built and integrated matching the conventional water treatment plant using four values of flow rate (0.475,0.712,0.95,1.18 m3 /hr) using different turbidities.
This model consists of basic units coagulation, flocculation and sedimentation . By using a dynamic similarity application between the model and prototype , the Froude number must be the same for both model and prototype .
The bentonite soil as well as river soil were used for preparing the required turbidity. A high-rate sedimentation unit was considered in a pilot plant using plates settler and compared with the conventional. Dual media filter with anthracite was added as well as a single filtration unit that existing in plant, with same dimensions, where the layer deep was (0.7 m) divided to (0.35m) sand and (0.35m) anthracite.
The activated carbon filters were linked after the single filter media and the other one after the dual filter media. Best velocity gradient in rapid mixing tank is (G_rapid ) ≥750 s̄1 and in flocculation basin is 15 s ̄ ¹ < G_flocc < 60 s̄¹ and values of (〖Gt〗_flocc) = [(104) -(15*104)]. The best efficiencies of removal in sedimentation basin with plate settler were 94.07% and 72.07 % using bentonite and river soil respectively. The enhancement in removal efficiency is about 23% when using bentonite. When using river soil, The best removal efficiencies in sedimentation basin were 74.02% and 66.28% with and without using inclined plate settler respectively.
The enhancement in removal efficiency was about 11% when using plate settler. The efficiency of removal using inclined plates was best especially when doubling the flow rate (1.5-2.5) times. The best conditions when flow rate = 2100 m³/hr, turbidity at 50 NTU, using river soil, with inclined plate settler, dual filter media and activated carbon filter where the efficiency of removal was 98.23%, while the efficiency of removal using bentonite ,without using inclined plates ,using activated carbon filter and dual filter media at turbidity 200 NTU ,flow rate1050m3/hr, it was 99.27%.
This indicate ,when using bentonite for Increasing water turbidity has a positive impact in removal efficiency.
In conclusion, a significant increase of (150% -250%) in the production of station, efficiency and moderate economic cost. Key Words: Plate Settler, Activated Carbon, Bentonite, Turbidity, Removal Efficiency and Water Quality Index.