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The single factor analysis of AT doses was conducted in series batch experiments. UV254 and DOC removal efficiencies before and after AT addition were compared to investigate the optimum AT dosage. Following the increase of the AT doses from 3 to 7%, the removal efficiencies of both UV254 and DOC were increased to a maximum value and then decreased with an optimum dosage range. Five per cent of AT/MLSS (g/g) addition owned the best removal efficiencies for both of the UV254 and DOC (Table 2).

Table 2

Impact of AT dosages on the UV254 and DOC removal efficiency

 AT dosages (g/gMLSS)3%4%5%6%7%
UV254 Influent (cm–10.246 0.256 0.242 0.250 0.252 
Effluent (cm–10.236 0.227 0.230 0.234 0.242 
Removal efficiency (%) 4.1% 5.0% 5.3% 6.4% 4.0% 
DOC Influent (mg/L) 54.25 43.86 49.67 50.84 52.81 
Effluent (mg/L) 27.21 24.91 23.24 25.22 27.04 
Removal efficiency (%) 49.84 43.2 53.2 50.4 48.8 
 AT dosages (g/gMLSS)3%4%5%6%7%
UV254 Influent (cm–10.246 0.256 0.242 0.250 0.252 
Effluent (cm–10.236 0.227 0.230 0.234 0.242 
Removal efficiency (%) 4.1% 5.0% 5.3% 6.4% 4.0% 
DOC Influent (mg/L) 54.25 43.86 49.67 50.84 52.81 
Effluent (mg/L) 27.21 24.91 23.24 25.22 27.04 
Removal efficiency (%) 49.84 43.2 53.2 50.4 48.8 

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