Advanced treatment of biologically treated coking wastewater by persulfate oxidation with magnetic activated carbon composite as a catalyst | Zendy

Xiulan Song | Zendy; Chao Wang | Zendy; Meiqin Liu | Zendy; Miao Zhang | Zendy

Open Access

Advanced treatment of biologically treated coking wastewater by persulfate oxidation with magnetic activated carbon composite as a catalyst

Author(s) -

Xiulan Song,

Chao Wang,

Meiqin Liu,

Miao Zhang

Publication year - 2018

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2018.069

Subject(s) - persulfate , chemistry , decomposition , activated carbon , effluent , catalysis , phenol , total organic carbon , adsorption , nuclear chemistry , environmental chemistry , organic chemistry , waste management , engineering

Advanced treatment of biologically treated coking wastewater (BTCW) using persulfate (PS) oxidation with magnetic activated carbon composite (CuFe 2 O 4 :AC w/w ratio of 1:1.5, denoted as 1.5-MACC) as a green catalyst was evaluated at ambient temperature (30 °C). Effects of PS (K 2 S 2 O 8 ) and 1.5-MACC doses on PS decomposition and total organic carbon (TOC) removal in BTCW were also studied during 360 min. The results showed that the 1.5-MACC/PS system has a much better performance on TOC removal in BTCW than only 1.5-MACC or PS system. PS decomposition and TOC removal follow first-order kinetics in the 1.5-MACC/PS system. The optimum condition of the 1.5-MACC/PS system to treat BTCW is with a K 2 S 2 O 8 dose of 4 g L -1 and 1.5-MACC dose of 5 g L -1 . Under this condition, TOC in the PS oxidation effluent is 20.4 mg L -1 with a removal efficiency of 85.4%. TOC removal is a synergistic effect of adsorption and oxidation. TOC oxidation is due to the generation of ·SO 4 - via the activation of PS by CuFe 2 O 4 impregnated AC. The gas chromatography-mass spectrometry (GC-MS) analysis revealed that phenol compounds and esters were removed significantly by the 1.5-MACC/PS system. When 1.5-MACC was used for the fourth time in the 1.5-MACC/PS system, the removal ratio of TOC was still over 62.2% in 360 min reaction. Thus, the 1.5-MACC/PS system has a potential practical application in treatment of BTCW.

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