Table 4.

Recently reported UASB modified systems.

Substrate	Reactor	Temperature (°C)	Product	Hydraulic Retention Time (d)	Organic Loading Rate (kg COD/m3d)	Yield	Reference
Palm oil mill effluent	UASB	55	H2	0.25	-	11.75 1	[89]
Winery wastewater	UASB	37	H2	0.23	-	62 2	[91]
Synthetic media	UASB	-	H2	0.25	-	4.34 1	[90]
Foul condensate from Kraft mill	UASB	22–55	VFA	3.13	8.6	52–70 3	[92]
Nitrobenzene	UASB with nanoscale zero-valent iron addition	35	CH4	1	0.2 4	-	[93]
Petroleum wastewater	UASB with diatomite and maifanite addition	36	CH4	10–20	11	1.61–2.2 5	[94]
Sewage water	Packed UASB reactor	Ambient	CH4	0.21–0.25	1.8	-	[95]
Swine wastewater	UASB+ aerobic packed bed reactor	37	CH4	0.79	3.26–10.14	0.26–0.81 6	[96]
Textile wastewater	Micro-aerated UASB	25	CH4	-	1.27–1.5	-	[97]
Cattle slaughterhouse wastewater	UASB with synthetic grass packing	35	CH4	1	10	2.0 5	[98]
Diluted food waste paste	UASB with biochar addition	30	CH4	1	6.9–7.8	0.86 7	[99]

¹ L H₂/L_effluent d, ² mL H₂/L h, ³ % of utilized carbon, ⁴ kg NB/m³d, ⁵ m³/m³d, ⁶ kg COD-CH₄/kg VSS d, ⁷ L biogas/g COD_removed d.