Evaluation of Efficacy of Anionic Surfactant Degradation in the Presence of Concomitant Impurities of Natural Waters

Table 6

Effect of bicarbonate ions on the degree of destruction of fulvic acid by various methods.

Characteristic of fulvic acid solution	Oxidation method	𝑣oz, mg/(dm^3·min)	Discoloration, %	ΔTOC, %	𝐷oz/ΔTOC, mg/mg
TOC0—16.4 mg/dm^3, pH 8.2, 2 mg-eq/dm^3  HCO3^−	O3/UV	3.2	94	35	10.1
	O3/TiO2/UV	3.4	98	60	6.7
	O2/TiO2/UV	—	92	30	—
TOC0—15.8 mg/dm^3, pH 6, 0 mg-eq/dm^3  HCO3^−	O3/UV	3.1	86	51	7.3
	O3/TiO2/UV	3.2	94	85	4.6
	O2/TiO2/UV	—	95	53	—

Note: 𝑡 = 30 min; 𝐼_UV = 8 mW/cm²; 𝑇 = 18 ± 1°C.