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Table 2

Results of CODt, CODs and DS average in each activated sludge sample

ParametersWASSDRCSSDPTSSD
CODt (mg of O2 L−128,280 1,110 28,289 542 26,628 2,588 
CODs (mg of O2 L−1264 41 589.5 105 785 140 
DS (%) – 0.74 0.32 1.18 0.47 
ParametersWASSDRCSSDPTSSD
CODt (mg of O2 L−128,280 1,110 28,289 542 26,628 2,588 
CODs (mg of O2 L−1264 41 589.5 105 785 140 
DS (%) – 0.74 0.32 1.18 0.47 

DS, degree of solubilization; SD (±), standard deviation; WAS, waste activated sludge; RCS, recirculated sludge; and PTS, pre-treated sludge.

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