This work hereby reports an eco-friendly efficient extractive wastewater dephenolization process with particular emphasis on cutting secondary organic pollutants. A collection of coking waste water samples containing high phenol concentration was treated by an innovative phenol extraction method. To avoid experimental errors and facilitate water treatment, certain parameters were selected for determining the chemical composition of waste water samples. The distilled ammonia waste water was found to be ideal due to lack of oil film or ammonium sulfate tar precipitation during the dephenolization. In contrast to distilled ammonia waste water, the residual ammoniated water not only was the cause of extreme water pollution, it also consumed large quantity of acid resulting in high cost, thus creating economic issues for this process. For environmental aspects, while determining the phenol removal efficiency other influencing factors, such as determination of cyanides, sulfur ions, ammonia nitrogen content, chloride ions, sulfate ions, total volatile phenols, total salts, sewage oil content, along with total hardness, CODcr, electrical conduction and pH for comparative test and analysis of alkali-enhanced extractant were also determined. The diffusion behavior of organic molecules and reasons which determine changes in parameter before and after the phenol extraction were studied. Repeatedly washing the used BQ complex extractant 5 times with 3wt% sodium hydroxide solution at 23℃, the relatively optimal regenerated extractant can be prepared. The VHC value of the waste water processed by regenerated extractant was 265.45 mg/L. The regenerated BQ complex extractant was found to have a level of CODcr, sewage oil content, pH, dephenolization efficiency values as 3638.34, 188.86, 6.18, 83.76%, respectively, which meaned very little secondary organic pollutants.
Dingtian XIAO Latif ULLAH Shan QING Huaqiang XIAO
. High phenol-containing coking wastewater treatment with environmentally benign alkali-enhanced extractant[J]. The Chinese Journal of Process Engineering, 2018
, 18(S1)
: 153
-160
.
DOI: 10.12034/j.issn.1009-606X.20180231
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