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In Phase II, Part II of this study, the optimum doses of the recovered coagulant solution and commercial alum were applied to the raw water using jar test. The analyses of the treated water by the optimum doses of recovered coagulant solution and commercial alum are reported in Table 4. As shown, the quality of the treated water using recovered coagulant solution and commercial alum was almost similar. Turbidity was 1.4 and 1.9 NTU when using commercial alum and recovered aluminum solution, respectively. This reveals that the recovery process did not affect leached coagulant efficiency in turbidity removal. This agrees with the findings of Keeley et al. (2014a), who reported that the recovered coagulants were capable of treating water and removed 60–70% of raw water turbidity for river and upland reservoir waters.

Table 4

Complete analyses of raw water from ESZ-WTP and treated water from jar testing using recovered coagulant solution and commercial alum

No.ParameterUnitRWTW – CASTW – RCS
pH – 7.9 7.4 7.6 
Turbidity NTU 8.0 1.4 1.9 
Temperature °C 24.3 25.2 25.1 
Conductivity μS/cm 327 338 339 
Total dissolved solids mg/L 218 225 226 
Total alkalinity mg/L 147 126 134 
Chlorides mg/L 18 23 66 
Aluminum mg/L 0.05 0.18 0.17 
Iron mg/L 0.02 ND ND 
10 Manganese mg/L ND ND ND 
11 Total THMs mg/L ND 0.07 0.09 
12 Algae count Organism/mL 5,130 207 217 
13 Total plate count at 37 °C Cell/mL 2,970 32 43 
14 Total coliform bacteria Cell/mL 1,485 160 190 
No.ParameterUnitRWTW – CASTW – RCS
pH – 7.9 7.4 7.6 
Turbidity NTU 8.0 1.4 1.9 
Temperature °C 24.3 25.2 25.1 
Conductivity μS/cm 327 338 339 
Total dissolved solids mg/L 218 225 226 
Total alkalinity mg/L 147 126 134 
Chlorides mg/L 18 23 66 
Aluminum mg/L 0.05 0.18 0.17 
Iron mg/L 0.02 ND ND 
10 Manganese mg/L ND ND ND 
11 Total THMs mg/L ND 0.07 0.09 
12 Algae count Organism/mL 5,130 207 217 
13 Total plate count at 37 °C Cell/mL 2,970 32 43 
14 Total coliform bacteria Cell/mL 1,485 160 190 

RW: raw water of ESZ-WTP; TW – CAS: treated water from the jar test at the optimum dose of commercial aluminum sulfate; TW – RCS: treated water from the jar test at the optimum dose of recovered coagulant solution (three times recovery).

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