Table 1: Various concentration of nitrogen in different type of wastewater.
| Type of Wastewater | Ammonium Nitrogen Concentration (mg/L) | References |
| Industry: | ||
| Metal Plating | 50-600 | Stankovic, et al. [40] |
| Rubber Manufacturing | 150-200 | Subbiah, et al. [41] |
| Domestic | 20-40 | Davis, et al.; Santos, et al. [42,43] |
| Landfill Leachate | 50-2200 | Kjeldsen, et al.; Renou, et al. [44,45] |
| Swine | 400-800 | Nicholson, et al.; Vanotti, et al. [46,47] |