Detoxification of a pyrolytic aqueous condensate from wheat straw for utilization as substrate in Aspergillus oryzae DSM 1863 cultivations

Table 1 GC analysis of pyrolytic aqueous condensate (PAC) treated with overliming at different conditions

Substance	A. oryzae growth limit [g/L]^a	c in original PAC [g/L]^b	c [g/L] in PAC after treatment at 100 °C and the following conditions…
			Duration [h]	4	4	1.5
			Initial pH	10	10	12
			Hydroxide	Ca(OH)2	NaOH	NaOH
Acetate	> 70	29.76		40.51 ± 0.19	38.35 ± 0.33	41.24 ± 1.87
Acetol	15	51.46		9.99 ± 0.91	11.50 ± 0.75	6.31 ± 0.42
Guaiacol	1	1.80		0.55 ± 0.01	0.67 ± 0.01	0.48 ± 0.00
Furfural	0.3	2.94		0.22 ± 0.03	0.31 ± 0.06	0.12 ± 0.00
Phenol	0.7	0.64		0.44 ± 0.00	0.46 ± 0.01	0.4 ± 0.00
2-Cyclopenten-1-one	0.0625	3.40		1.22 ± 0.01	1.11 ± 0.03	0.45 ± 0.00

^aDetermined by Dörsam et al. [19] as % (w/v). The concentration was converted into g/L assuming the density of water [2]. The only exception was acetate, for which, according to the results of Kövilein et al. [42], no growth limit was determined so far
^bGC/MS analysis performed by Thünen Institute of Wood Research in Hamburg for PAC that was neither pH adjusted nor filtered

ISSN: 2731-3654