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Table 5

Unit costs of nitrogen removal with methanol, ethanol and acetic acid as external carbon source

Specification	Organic carbon source
Specification	Methanol	Ethanol	Acetic acid
COD [g/m³]	1,400,000	1,800,000	600,000
Price [EUR/L]	0.5	1.09	0.41
Unit carbon source demand for denitrification^a [g COD/g N]	3.5–4.67	3.85–4.4	3.1–3.7
Unit cost of nitrogen removal [EUR/g N]	0.0009–0.0012	0.0023–0.0026	0.0021–0.0025

Specification	Organic carbon source
Specification	Methanol	Ethanol	Acetic acid
COD [g/m³]	1,400,000	1,800,000	600,000
Price [EUR/L]	0.5	1.09	0.41
Unit carbon source demand for denitrification^a [g COD/g N]	3.5–4.67	3.85–4.4	3.1–3.7
Unit cost of nitrogen removal [EUR/g N]	0.0009–0.0012	0.0023–0.0026	0.0021–0.0025

^aValues assumed basing on the literature data (Christensson et al. 1994; Nyberg et al. 1996; Kim & Son 2000; Ledwell et al. 2011).