Novel Advanced Treatment of Physically Treated Effluent from Herbal Decoction Pieces Wastewater Using a Combined Ozone/Persulfate-UBAF Process
Guomin Tang 1,2,3,4  
,   Weiyu Chen 1,   Yujiang Wei 1,   Ting Shao 1,   Mengyuan Zhang 1,   Zhehua Jia 2,   Xuemin Yu 4,   Fang Ma 3
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Taizhou Institute of Science and Technology, Nanjing University of Science and Technology, Taizhou, Jiangsu Province, China
Province Key Laboratory of Environmental Material and Environmental Engineering, Yangzhou University, Yangzhou, Jiangsu Province, China
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang Province, China
Province Key Laboratory of Environmental Engineering, Jiangsu Environmental Science Research Institute, Nanjing, Jiangsu Province, China
Guomin Tang   

Taizhou Institute of Science and Technology, Nanjing University of Science and Technology, Taizhou 225300, Jiangsu Province, China, 225300 Taizhou, China
Submission date: 2018-03-26
Final revision date: 2018-06-04
Acceptance date: 2018-06-10
Online publication date: 2019-03-25
Publication date: 2019-04-09
Pol. J. Environ. Stud. 2019;28(4):2857–2866
Performance of ozone/persulfate-UBAF used for advanced treatment of physically treated effluent from herbal decoction pieces of wastewater was investigated in a pilot scale experiment. Under optimum conditions – i.e., an initial pH, temperature 13-27ºC, 30 min of oxidation, 35 mg/L O3 dosage, S2O82-/COD (g/g) ratio (0.15), gas/liquid ratio in UBAF (3), hydraulic retention time in UBAF (5h) – the COD and NH3-N removal efficiencies were 87.54-89.53% and 82.94-86.77%, respectively. Under optimum conditions, ozone/persulfate oxidation lowered pH values by about 0.1 pH units (average value), presented lower OCC (from 0.14 to 0.16 kg O3/kg COD removed), and significantly improved the wastewater biodegradability from 0.16 to 0.55 (average value). Compared with O3/H2O2 oxidation, the ozone/persulfate system achieved a better enhancement effect in wastewater treatment (i.e., decreased 24.0% OCC and saved 11.4% in operational costs). Furthermore, the COD removal rate in ozone/persulfate oxidation stage followed the first order, and the COD concentration in UBAF effluent was expressed by the model at various hydraulic loading rates for maintenance and selection of UBAF. Finally, the study proved that the combined process was an efficient technology in treating physically treated effluent from herbal decoction pieces wastewater.