Sample No.

Ratio (Sludge/Waste)

Initial voltage (mV) at 2nd day

Peak voltage (mV)

Peak voltage duration (day)

Final voltage (mV) at 60 days

I

1:2

2

350

27

111

II

2:1

218

263

21

178

III

1:1

346

416

13

153

IV

Only OWa

918

918

2

243

V

Only SSb

794

960

13

590