Owing to its high ratio of height and diameter (4–8), land saving, high organic loading rate (OLR) (20–50 kg COD/m3 d), resistance to shock loading, and high processing efficiency, IC anaerobic reactors are commonly being used to treat high-concentration organic wastewater with good biodegradability, such as potato processing wastewater, brewery wastewater, soy protein, and citric acid wastewater