Table 2.

Summary of nitrogen and COD concentrations in industrial and mining wastewaters.

	NH4+ conc. (mg-N/L)	NO3− conc. (mg-N/L)	COD conc. (mg/L)	CN−/ SCN− (mg/L)	C/Na	Remarks	References
1	-	-	-	840	-	Wastewater from gold leaching process	Song et al. (2021)
2	110–165	55-80	2,750	0.5–3.5/22–45	16–25	Coal gasification wastewater	Wang et al. (2012)
3	325	201	-	-	-	Wastewater from fertilizer factory	Leaković et al. (2000)
4	56–132	0.5-1.2	900–2000	-	7–36	Wastewater from petrochemical industry	Qin et al. (2007)

^aCalculated.