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An amount of 2.73 mL of K-Tonic solution was added to the North storage tank, which resulted in total organic carbon (TOC) of 0.76 mg/L. Then 3.13 mL of the same solution (K-tonic solution) was added to the West storage tank to obtain a TOC concentration of 0.87 mg/L. About 4.66 and 6.13 mL of sodium hypochlorite solution (at 13%) was added to the West and North storage tanks, respectively, which resulted in corresponding chlorine concentrations of approximately 1.35 and 1.77 mg/L. The solutions in each tank were mixed using a manual mixer as described earlier. The experiment extended for about 24 hours. Initial concentrations of chemical parameters for scenarios 1 and 2 are presented in Tables 1 and 2 respectively.

Table 1

Initial concentrations of chemical and biological parameters in storage tanks (scenario 1)

Sampling pointsChlorine mg/LK-tonic solution (mL)Temperature (°C)Turbidity (NTU)Residence time (h)TOC (mg/L)Total coliforms (CFU)E. coli (CFU)
North storage tank 1.77 3.13 19.3 1.2 6.0 0.87 0.0 0.0 
West storage tank 1.35 2.73 18.9 0.9 6.0 0.76 0.0 0.0 
Sampling pointsChlorine mg/LK-tonic solution (mL)Temperature (°C)Turbidity (NTU)Residence time (h)TOC (mg/L)Total coliforms (CFU)E. coli (CFU)
North storage tank 1.77 3.13 19.3 1.2 6.0 0.87 0.0 0.0 
West storage tank 1.35 2.73 18.9 0.9 6.0 0.76 0.0 0.0 
Table 2

Initial concentrations of chemical and biological parameters in storage tanks (scenario 2)

Sampling pointsChlorine (mg/L)K-tonic solution (mL)Temperature (°C)Turbidity (NTU)Residence time (h)TOC (mg/L)Total coliforms (CFU)E. coli (CFU)
North storage tank 1.06 1.80 19.8 1.1 6.0 0.51 0.0 0.0 
West storage tank 1.70 2.05 18.1 1.6 6.0 0.57 0.0 0.0 
Sampling pointsChlorine (mg/L)K-tonic solution (mL)Temperature (°C)Turbidity (NTU)Residence time (h)TOC (mg/L)Total coliforms (CFU)E. coli (CFU)
North storage tank 1.06 1.80 19.8 1.1 6.0 0.51 0.0 0.0 
West storage tank 1.70 2.05 18.1 1.6 6.0 0.57 0.0 0.0 

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