Removal Effect of Organics in Reverse Osmosis Concentrate of Municipal Wastewater by Ozone Catalytic Oxidation

doi:10.12068/j.issn.1005-3026.2024.09.016

Abstract

Abstract:

To effectively remove the organics in municipal wastewater reverse osmosis concentrate （ROC） and understand their removal characteristics， the performance of ozone catalytic oxidation in the treatment of municipal wastewater ROC was studied based on measurements of conventional wastewater quality indices， analyses of relative molecular mass classification and hydrophobic/hydrophilic properties of organic matters， and methods of chromatography?mass spectrometry and electron paramagnetic resonance spectroscopy. The results indicate that the optimal treatment conditions are a reaction time of 80 min， an ozone mass concentration of 17 mg/L， and a raw wastewater pH of 7.3. The removal efficiencies of chemical oxygen demand （COD）， UV absorbance at 254 nm wavelength （UV₂₅₄）， large?molecule organics （>30 ku） and hydrophilic acid component （HOA） are 55.75%， 85.05%， 95.46%， and 72.06%， respectively. Refractory organics such as aromatic hydrocarbons and humic acids， as well as pharmaceutical and personal care products （PPCPs） can be efficiently removed. Active substance·OH is generated. The data of COD degradation can be well described by a second?order reaction kinetics model.

Key words: ozone catalytic oxidation, reverse osmosis concentrate, organics, pharmaceutical and personal care products （PPCPs）

CLC Number:

X 703

Yu XIA, Jing LIU, Xu-wen HE, Hong-ying YANG. Removal Effect of Organics in Reverse Osmosis Concentrate of Municipal Wastewater by Ozone Catalytic Oxidation[J]. Journal of Northeastern University(Natural Science), 2024, 45(9): 1342-1351.

Figures/Tables 12

Table 1 Index information of ROC conventional water quality

指标	ρ_COD/(mg·L^-1)	ρ_DOC/(mg·L^-1)	UV₂₅₄/cm^-1	SUVA/(L·m^-1·mg^-1）
数值	65.409±2.520	21.320±1.350	0.434±0.001	2.030±0.147

Fig.1 Ozone catalytic oxidation units

Fig.2 COD，DOC and UV254 removal rates at differentozone concentrations （mean±standard error）（a）—COD；（b）—DOC；（c）—UV254.

Fig.3 COD，DOC and UV254removal rates at differentinitial pH （mean±standard error）（a）—COD；（b）—DOC；（c）—UV254.

Fig.4 Molecular weight distribution removal rates of ROC before and after ozone catalytic oxidation

Fig.5 Hydrophobic/hydrophilic properties of organic matters in ROC before and after ozone catalytic oxidation

Fig.6 Three?dimensional fluorescence spectrogram of ROC before and after ozone catalytic oxidation treatment

Fig.7 UV-Vis spectrogram of ROC before and after ozone catalytic oxidation treatment

Fig.8 GC-MS full sweep spectra of ROC before and after ozone catalytic oxidation treatment

Table 2 Analysis of PPCPs composition after ozone catalytic oxidation of ROC

序号	种类	PPCPs	质量浓度
序号	种类	PPCPs	原水	出水	检出限
1	磺胺类	磺胺甲恶唑（SMX）	68.559	N.D.^a	0.116
2		磺胺吡啶（SPD）	59.064	N.D.^a	1.340
3		磺胺间甲氧嘧啶（SMM）	7.141	6.970	0.095
4		磺胺嘧啶（SD）	7.971	N.D.^a	0.417
5		甲氧苄啶（TP）	5.866	N.D.^a	0.017
6	大环内酯类	阿奇霉素（ATM）	15.969	2.898	2.470
7		罗红霉素（RTM）	66.872	N.D.^a	0.062
8		克拉霉素（CTM）	24.280	N.D.^a	0.056
9		红霉素（ETM）	65.864	2.929	0.112
10	喹诺酮类	环丙沙星（CPX）	33.922	N.D.^a	0.993
11	喹诺酮类	氧氟沙星（OFX）	101.939	1.858	0.164
12	酰胺醇类	氟苯尼考（FF）	19.640	N.D.^a	0.508
13	非多烯类	灰黄霉素（GSV）	7.745	N.D.^a	0.819
14	利托那韦（RTV）		2.803	2.284	0.618
15	苯扎贝特（BF）		10.137	N.D.^a	0.011
16	卡马西平（CBZ）		6.594	N.D.^a	0.037
17	氯贝酸（CA）		19.729	N.D.^a	7.598
18	双氯芬酸（DF）		36.842	N.D.^a	1.090

Fig.9 Electron paramagnetic resonance spectrogram

Fig.10 Kinetic fitting of COD degradation in municipal wastewater ROC treated by ozone catalytic oxidation

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