TABLE 3.

Comparison of studies on packed-bed denitrification.

Type of the reactor	Type of the packed filter	HRT (h)	Temperature (°C)	The maximum denitrification rate (mg-N⋅L–1⋅d–1)	References
Column reactor	PHBV-Sawdust	1.5	/	146	Yang et al., 2020
Column reactor	Sulfur/Limestone	24–3	6–28	300	Sahinkaya et al., 2014
Column reactor	PCL/Starch	2–0.5	15–25	640	Shen et al., 2013
Column reactor	Polybutylene succinate/Bamboo powder	4	26	340	Qi et al., 2020
Column reactor	Sulfur/Shell/Peanut hull	6–1	10–31	723	This study