Table 2.

Average concentrations of selected micropollutants in wastewater before/after conventional treatment in the aeration tank followed by ozonation as well as in the hydroponic system Line B operated in flow-through mode in 2017

Target compound	ACE	CAF	CBZ	DIC	IBU	SMX	ASMX	BTZ	MBT
Conventional treatment
Effluent grit chamber	14.1	110	1.56	7.09	19.0	0.59	1.56	13.1	1.42
Effluent secondary settling tank	0.76	0.09	1.52	3.20	< MQL	0.23	0.30	5.35	0.84
Removal [%]	95	100	3	55	100	57	81	59	41
Ozonation
Effluent ozone reactor	0.35	0.06	0.13	0.21	< MQL	0.07	0.10	2.23	0.23
Removal [%]	98	100	92	97	100	88	94	83	84
Hydroponic system, Line B: reclaimed water from ozone reactor
Influent	0.37	0.11	0.02	0.17	< MQL	0.10	0.12	1.99	0.20
Effluent	0.48	0.06	< MQL	0.09	< MQL	0.08	0.09	1.94	0.36
Lettuce shoots	< MQL	< MQL	12.2	< MQL	< MQL	< MQL	< MQL	< MQL	< MQL
Lettuce roots	26.5	< MQL	12.4	12.2	< MQL	< MQL	< MQL	< MQL	< MQL

Concentration in wastewater, reclaimed water: μg L⁻¹. Concentration in lettuce: μg kg⁻¹ dry weight. MQL: method quantitation limit

ACE acesulfame, CAF caffeine, CBZ carbamazepine, DIC diclofenac, IBU ibuprofen, SMX sulfamethoxazole, ASMX acetyl-sulfamethoxazole, BTZ 1H-benzotriazole, MBT 4/5-methylbenzotriazole