Highly efficient treatment of real benzene dye intermediate wastewater by simple limestone and lime neutralization-coagulation with improved Fenton oxidation
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Multistage Fenton oxidation is a favored method for the treatment of benzene dye intermediate (BDI) wastewater, but the pH adjustments required after each stage of the Fenton process with a simple way is still a challenge. Limestone pretreatment and lime neutralization-coagulation were used to solve the problem in multistage Fenton process. First, we determined the optimal conditions of Fenton oxidation using the Box-Behnken response surface method. Limestone pretreatment before the multistage Fenton process allowed for simultaneous pH adjustment and 14.15% COD removal. Most notably, the lime cream neutralization-coagulation process effectively adjusted the pH after each stage of the Fenton process. The optimum CaO particle size, lime mass fraction, mixing time, and stirring speed were determined by orthogonal tests. COD removal (89.23%) was obtained when lime cream neutralization-coagulation was applied to the three-staged Fenton process, while only 58.57% COD removal was obtained by the unadjusted single-staged Fenton process. The COD and wastewater color were reduced from 10,600 mg/L and 12,200 multiples to 495 mg/L and 20 multiples, respectively, using the adjusted process. This improved method provides a promising cost-effective way to efficiently treat real BDI wastewater.
KeywordsReal benzene dye intermediate wastewater Limestone pretreatment Lime neutralization-coagulation Three-staged Fenton process
This study was financially supported by the Fundamental Research Fund for the Central Universities (No. 2652017166), the fund of water quality control principles for safe storage of reclaimed groundwater (Project No. 51238001), the National Natural Science Foundation of China (Grant 41672239 and Grant 41572229), the Research Fund of China Geological Survey (1212011121166 and DD20160300), and the National Water Pollution Control and Treatment Science and Technology Major Project (2015ZX07406005-001).
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