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Studies in section B were aimed at understanding the effect of pipe materials on microbial and chemical characteristics. Samples from sector B (which comes from the East outlet of sector A) were collected after an incubation period of 18 hours and analyzed for chemical and biological parameters. The results indicate that the organic content (TOC) and total coliform counts in the HDPE and steel pipes increased over the 18 h period due to the reaction with the pipe material and NOM in the water. Results for scenario 1 (sector B) are presented in Tables 4 and 5 respectively.

Table 4

Water quality parameters for samples from different pipe materials in sector B for scenario 1

Sampling pointsChlorine (mg/L)pHTemperature (°C)Turbidity (NTU)TOC (mg/L)
Initial water quality characteristic of sector B 
 0.53 18.6 1.1 0.69 
Final water quality characteristic of sector B 
PVC pipe 0.00 18.3 1.1 0.98 
HDP pipe 0.27 19.0 1.1 3.29 
Steel pipe 0.00 18.5 1.2 1.08 
Sampling pointsChlorine (mg/L)pHTemperature (°C)Turbidity (NTU)TOC (mg/L)
Initial water quality characteristic of sector B 
 0.53 18.6 1.1 0.69 
Final water quality characteristic of sector B 
PVC pipe 0.00 18.3 1.1 0.98 
HDP pipe 0.27 19.0 1.1 3.29 
Steel pipe 0.00 18.5 1.2 1.08 
Table 5

Total coliforms level in sector B for scenario 1

Sampling pointsTotal coliform Sample 1 (CFU)Total coliform Sample 2 (CFU)Total coliform Sample 3 (CFU)MeanStandard deviationTotal coliforms (CFU)E. coli (CFU)
PVC pipe 0.0 0.0 0.0 0.0 0.0 0.0 0.0 
HDP pipe 10 12 10 2.0 10.0 0.0 
Steel pipe 40 38 42 40 2.0 40.0 0.0 
Sampling pointsTotal coliform Sample 1 (CFU)Total coliform Sample 2 (CFU)Total coliform Sample 3 (CFU)MeanStandard deviationTotal coliforms (CFU)E. coli (CFU)
PVC pipe 0.0 0.0 0.0 0.0 0.0 0.0 0.0 
HDP pipe 10 12 10 2.0 10.0 0.0 
Steel pipe 40 38 42 40 2.0 40.0 0.0 

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