Zero Discharge Performance of an Industrial Pilot-Scale Plant Treating Palm Oil Mill Effluent

Table 4

Evaluation of anaerobic EGSB in biogas production in the pilot plant.

Parameter	Unit	Average value
2-EGSB total effective volume	m^3	847.8
Capacity	m^3/d	86.4 ± 4.1
Influent COD	mg/L	71179 ± 10950
EGSB effluent COD	mg/L	12341 ± 1338
DAF effluent COD	mg/L	3587 ± 546
EGSB effluent COD deducing; recycled sludge	mg/L	7917 ± 955
Apparent COD removal rate	%	94.84 ± 1.08
Real COD removal rate	%	88.56 ± 1.97
Biogas production	m^3/d	2389.0 ± 201.3
COD reduction	kg/d	5465.8 ± 259.4
Organic loading rate (OLR)	Kg COD/m^3·d	6.45 ± 0.61
Efficiency (in POME injection)	m^3 biogas/m^3 POME	27.65 ± 3.02
Efficiency (in POME injection)	m^3 biogas/kg COD	0.44 ± 0.04

Note: all data are shown as means ± standard deviation of all samples.