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Table 2

Key performance parameters of the UASB reactor for Phases 1, 2 and 3 (mean values and standard deviation)

Parameters	Units	Phase 1		Phase 2		Phase 3
Parameters	Units	Influent	Effluent	Influent	Effluent	Influent	Effluent
Temperature	°C	23.7 ± 2.1	22.5 ± 3.0	25.5 ± 1.6	25.5 ± 1.7	22.0 ± 1.6	21.0 ± 1.7
pH	–	7.2 ± 0.1	7.7 ± 0.2	7.3 ± 0.2	7.6 ± 0.2	7.1 ± 0.2	7.5 ± 0.1
Partial alkalinity	mg L⁻¹	732 ± 312	880 ± 353	114 ± 90	195 ± 60	298 ± 78	723 ± 169
Total alkalinity	mg L⁻¹	1,047 ± 424	1,150 ± 434	235 ± 214	244 ± 71	680 ± 146	968 ± 221
VFAs	mg L⁻¹	277 ± 167	119 ± 90	49 ± 26	27 ± 35	638 ± 187	110 ± 72
BOD	mg L⁻¹	719 ± 267	118 ± 38	276 ± 75	61 ± 23	1,440 ± 223	528 ± 218
COD_total	mg L⁻¹	1,549 ± 729	357 ± 112	434 ± 114	172 ± 67	2,405 ± 866	464 ± 343
TS	mg L⁻¹	1,631 ± 521	984 ± 203	820 ± 416	590 ± 201	1,892 ± 588	961 ± 357
TSS	mg L⁻¹	663 ± 492	125 ± 83	267 ± 199	131 ± 174	857 ± 392	125 ± 83

Parameters	Units	Phase 1		Phase 2		Phase 3
Parameters	Units	Influent	Effluent	Influent	Effluent	Influent	Effluent
Temperature	°C	23.7 ± 2.1	22.5 ± 3.0	25.5 ± 1.6	25.5 ± 1.7	22.0 ± 1.6	21.0 ± 1.7
pH	–	7.2 ± 0.1	7.7 ± 0.2	7.3 ± 0.2	7.6 ± 0.2	7.1 ± 0.2	7.5 ± 0.1
Partial alkalinity	mg L⁻¹	732 ± 312	880 ± 353	114 ± 90	195 ± 60	298 ± 78	723 ± 169
Total alkalinity	mg L⁻¹	1,047 ± 424	1,150 ± 434	235 ± 214	244 ± 71	680 ± 146	968 ± 221
VFAs	mg L⁻¹	277 ± 167	119 ± 90	49 ± 26	27 ± 35	638 ± 187	110 ± 72
BOD	mg L⁻¹	719 ± 267	118 ± 38	276 ± 75	61 ± 23	1,440 ± 223	528 ± 218
COD_total	mg L⁻¹	1,549 ± 729	357 ± 112	434 ± 114	172 ± 67	2,405 ± 866	464 ± 343
TS	mg L⁻¹	1,631 ± 521	984 ± 203	820 ± 416	590 ± 201	1,892 ± 588	961 ± 357
TSS	mg L⁻¹	663 ± 492	125 ± 83	267 ± 199	131 ± 174	857 ± 392	125 ± 83