Table 1.

Reported recent literature studies on UASB treatment of high-loaded substrates.

Substrate	Temperature (°C)	Influent Chemical Oxygen Demand (g/L)	Chemical Oxygen Demand Removal (%)	Hydraulic Retention Time (h)	Organic Loading Rate (g COD/L·d)	Methane Yield	Reference
Glutamate-rich wastewater	35	2.0	95.5–96.5	4.5–6	8.26–10.82	0.31 1	[25]
Monosodium glutamate	35	7.9	97	24	8	2.3 2	[26]
Sugarcane bagasse hydrolysate	20–30	1.82	86	18.4	2.4	0.27 1	[27]
Recycled paper mill wastewater	37	5.7	80.6	15.14	5.18	0.89 2	[28]
Vinasse	Ambient	120.2	91–93	40	72.1	0.46–0.53 2	[18]
Guar	37	1.1	79–84	10	2.78	0.15–0.16 3	[29]
Synthetic fiber wastewater	13.9–32.1	1.7–30.7	75.8	24	1.3–21.5	0.4–2 2	[30]
Pistachio wastewater	35	49.8	89.8	5.4 d	4.56	0.33 1	[31]
Perchlorate	30	-	84.7	2.2	9.96	-	[32]
Synthetic slaughterhouse wastewater	37	1.7	70	10	3.94–8.15	0.35 2	[33]
Chocolate wastewater	15–30	6.2	39–94	6	2–6	0.3–1.9 4	[34]
Pig slurry	36	21.5	-	1.5 d	14.3–16.4	0.25 1	[35]
Leachate from waste incineration	35	36.8	97.5–99.5	1.3–3 d	1.86–7.43	-	[36]

¹ L CH₄/g COD, ² L CH₄/L·d, ³ L CH₄/g COD d, ⁴ L biogas/L·d.