Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 177, Issue -, Pages 233-238Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2016.12.023
Keywords
Biologically pretreated Lurgi coal gasification wastewater; Microwave catalytic oxidation; Hydroxyl radicals; Superoxide radical; MBBR
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Funding
- Central University Basic Scientific Research Business Special Fund Projects [531107050887]
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Laboratorial scale experiments were conducted in order to investigate a novel system integrating microwave catalytic oxidation (MCO) and MBBR process on advanced treatment of biologically pretreated Lurgi coal gasification wastewater. Results indicated that MCO with catalyst of MOs/SAC (sewage sludge based activated carbon which loaded Mn oxides) represented high efficiencies in eliminating bio-refractory compounds by generating OH*, center dot O-2(-) and holes. GC-MS analysis indicated the MCO eliminated most bio-refractory compounds and improved the BOD5/COD from 0.08 to 0.48. Meanwhile, the integrated process exhibited efficient performance of COD, BOD5, TOC, NH4+-N and TN removals at a much shorter retention time of 8 h, with the effluent concentrations of 18.4, 2.3, 10.1, 3.2 and 10.6 mg/L, respectively, which all met class-I criteria of the Integrated Wastewater Discharge Standard. The total operating cost was 1.6 CNY/t. The integrated system was efficient, cost-effective and ecological sustainable and could be a promising technology for engineering applications. (C) 2016 Elsevier B.V. All rights reserved.
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