YINJian-ping,WANGYuan,WANGFeng,et al.Ozone-SBR-Ozone Combined Process for Treating Petrochemical Reverse Osmosis Concentrate[J].China Water & Wastewater,2025,41(15):135-142.
Ozone-SBR-Ozone Combined Process for Treating Petrochemical Reverse Osmosis Concentrate
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第15期
Page:
135-142
Column:
Date of publication:
2025-08-01
- Keywords:
- petrochemical wastewater; reverse osmosis concentrate; ozonation; SBR
- Abstract:
- The petrochemical reverse osmosis concentrate (ROC) was treated using a combined ozone-sequencing batch reactor-ozone (O3-SBR-O3) process. The effects of initial wastewater pH, O3 concentration, and reaction time on the oxidation efficiency were systematically investigated. Additionally, the impact of pre-oxidation duration with O3 on the treatment efficiency of the SBR was analyzed. Three-dimensional fluorescence spectroscopy (EEM) and Fourier infrared spectroscopy (FTIR) were employed to elucidate the mechanism of organic matter removal. Compared with SBR alone, under the conditions of initial raw wastewater pH of 6.98, O3 concentration of 30 mg/L, and pre?oxidation time of 60 minutes, the COD removal efficiency achieved by the O3-SBR process increased by 42.5%. Following 90 minutes of advanced O3 treatment of the effluent from the O3-SBR process, COD, TOC, NH3-N and TN in the effluent were reduced to 58 mg/L, 18 mg/L, 0.50 mg/L and 2.40 mg/L, respectively, which complied with the requirements specified in Emission Standard of Pollutants for Petroleum Chemical Industry (GB 31571-2015). The EEM results indicated that O-effectively removed both the original fulvic acid and humic acid present in the wastewater, as well as those generated during subsequent biochemical processes. According to the FTIR analysis, O3 pre-oxidation could eliminate certain phenolic and amine compounds, thereby reducing wastewater toxicity and enhancing its biodegradability. Biological treatment could produce metabolic byproducts, including polysaccharides, phenols, amino acid derivatives, and aromatic compounds originating from humic acid. The O3 advanced treatment process effectively removed soluble microbial products while facilitating the transformation of aromatic and aliphatic compounds into ester compounds.
Last Update:
2025-08-01