Evaluation of Water Purification Plant at Kosti City

Abstract

This study was done to investigate the drinking water quality of Kosti city distributed the pipeline of water network during March 2017 - May 2017 . Five sites of water network from Kosti city were selected comprising raw water, inside the plant , treated water after sterilization, 27 area, El Hilla El gadida ,Elnusri area . Thirty samples (30) of water were collected during these periods (March - May 2017 ) .Three samples were monthly collected from each site for examination and evaluation. Samples were subjected to physical, chemical and microbiological examinations and analyzed to investigate the level of the expected health hazards in each sample. The results obtained were compared with the standards from international and national drinking water guidelines in an attempt to evaluate the quality of drinking water in Kosti city. The results obtained showed that the turbidity level ranged from (4.2 – 150 NTU) thus exceeding the permissible level of WHO 1993 standards (5 NTU). The PH value was the range (6.3 – 8.2) and level of TDS (111 - 157 mg/L),hardness (43 - 89 mg/L),residual chlorine (0.1 - 0.4 mg/L) , EC (116 - 234 μs/cm). All these values fall below the values of national and international standards of WHO and Sudanese Standards . The level of COD(86 – 584.4 mg/L) ,BOD(16 -144mg/L) . All these values of Kosti water exceeding the permissible level of WHO 1993 standards. The study revealed that raw water of Kosti city was polluted by coliform and the results do not cope with international WHO, 1993 and the national Sudanese Standards (Physical and Chemical parameters) . After treatments of raw water the pollution incidence in tap water samples was decreased, however, slight pollution occurs in some of the treated water samples and to assess the water station, the water quality was found to be low. It may be stated that most of the tap water samples collected from the main distrib ution network are, suitable for human consumption. A number of recommendations were suggested to improve the drinking water quality .