Dephenolization method for phenol-containing wastewater by extraction
A technology for phenol wastewater and extraction, which is applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc. The effect of significant removal rate and difficulty reduction
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Embodiment 1
[0023] A method for extracting and removing phenols from wastewater containing phenols, comprising the following steps: using cyclohexanone as an extractant at a temperature of 30° C. Perform three-stage countercurrent extraction to obtain an extract phase and a raffinate phase. Among them, the pH value of the phenolic wastewater is 6.5, and the volume ratio of the extractant to the phenolic wastewater is 1:6.
[0024] The raffinate phase was detected, and the residual concentration of unit phenols was 85mg / L, the residual concentration of polyphenols was 180mg / L, and the concentration of total phenols was 265mg / L. The calculation shows that the removal rate of unit phenols is 98.5%, the removal rate of polyphenols is 96.0%, and the removal rate of total phenols is 97.4%.
Embodiment 2
[0026] A method for extracting and removing phenols from wastewater containing phenols, comprising the following steps: using cyclohexanone as an extractant at a temperature of 25° C. Perform three-stage countercurrent extraction to obtain an extract phase and a raffinate phase. Among them, the pH value of the phenolic wastewater is 7, and the volume ratio of the extractant to the phenolic wastewater is 1:7.
[0027] The raffinate phase was detected, and the residual concentration of unit phenols was 130mg / L, the residual concentration of polyphenols was 350mg / L, and the concentration of total phenols was 480mg / L. The calculation shows that the removal rate of unit phenols is 98.4%, the removal rate of polyphenols is 96.2%, and the removal rate of total phenols is 97.2%.
Embodiment 3
[0029] A method for extracting and removing phenols from wastewater containing phenols, comprising the following steps: using cyclohexanone as an extractant at a temperature of 25° C. Perform three-stage countercurrent extraction to obtain an extract phase and a raffinate phase. Among them, the pH value of the phenolic wastewater is 6, and the volume ratio of the extractant to the phenolic wastewater is 1:5.
[0030] The raffinate phase was detected, and the residual concentration of unit phenol was 75mg / L, the residual concentration of polyphenol was 130mg / L, and the concentration of total phenol was 205mg / L. The calculation shows that the removal rate of unit phenols is 98.4%, the removal rate of polyphenols is 96.3%, and the removal rate of total phenols is 97.5%.
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