New advanced treatment of biologically treated effluents from traditional Chinese medicine wastewater using the coupling process of O3/H2O2-BAF

• Published in: Journal of the Taiwan Institute of Chemical Engineers 2015-11, Vol.56, p.167-173
• Main Authors: Tang, Guomin, Jia, Zhehua, Yu, Xuemin, Lin, Dexian, Wang, Hua, Ma, Fang, Xu, Wei, Zhan, Changjuan, Wang, Yi
• Format: Article
• Language: English
• Subjects: Biodegradability; Biological aerated filter; Biologically treated effluents; O3/H2O2 oxidation; Opeartional cost; Traditional Chinese medicine wastewater
• ISSN: 1876-1070; 1876-1089
• DOI: 10.1016/j.jtice.2015.05.011

•The coupling process of O3/H2O2-BAF was conducted for the advanced treatment of biologically treated effluents from traditional Chinese medicine wastewater.•The coupling process was significantly efficient for the advanced treatment of this kind of wastewater and had economically good effect.•The COD concentration at different BAF height was expressed as a function of influent COD concentration, lnCCi=−1.40QCi0.26H.•The wastewater biodegradability has improved from 0.11 to about 0.56, the OC value was 0.20 kg O3/kg COD. The coupling process of O3/H2O2-biological aerated filter (BAF) was used to treat biologically treated effluents from traditional Chinese medicine wastewater. Under optimum conditions (i.e. 20 min of O3/H2O2 oxidation, a O3 dosage (50 mg/L), a 27.5% H2O2 dosage (85 mg/L), pH (7–9), a gas to liquid ratio (3), hydraulic retention of BAF 3 h, temperature (17–26 ℃)), the removal efficiencies for COD and color were 84.6–85.4% and 80.5–83.3%, respectively. The operational cost of the coupling process would be around 0.2198 $/m3, the operational cost of the O3/H2O2 oxidation stage were 0.2039 $/m3 and 0.7619 $/kg COD removed, respectively. Moreover based on the experiment conditions and equipment, the COD values at different BAF height was expressed as a function of influent COD concentration, lnCCi=−1.40QCi0.26H. The equation may be used to predict the COD removal efficiency at different influent COD values for refinement design of BAF. Finally under optimum conditions, ozone consumption in the O3/H2O2 oxidation was 0.20 kg O3/kg COD removed, the O3/H2O2 oxidation enhanced the wastewater biodegradability from 0.11 to about 0.56, and the inhibitory effect of the O3/H2O2 oxidation on microbial growth during subsequent biodegradation accounted for only 8%. [Display omitted]