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Citation: ZHI Liang, ZHANG Mingliang, LI Huaizhu, ZHAO Wei. Recovery and Removal of Phenols from High Concentration Phenolic Wastewater[J]. Chinese Journal of Applied Chemistry, ;2013, 30(11): 1333-1337. doi: 10.3724/SP.J.1095.2013.30026 shu

Recovery and Removal of Phenols from High Concentration Phenolic Wastewater

Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

Received Date: 9 January 2013
Revised Date: 4 March 2013

A chlorination combined oxidation process was proposed to recover and remove phenolic compounds from simulated wastewater containing 30 g/L phenol.First,enough chloride and hydrogen ions were introduced into the phenolic solution by adding hydrochloric acid under indication with a pH meter;sodium chlorate was then added to react with above ions to produce chlorine qualitatively. Under controlled experimental conditions,the chlorine combined with phenol and selectivity converted to the insoluble trichlorophenol,which was confirmed by GC-MS and its content was measured to be 97.76% through area normalization method.The chemical oxygen demand (COD) of filtrate obtained after the above process declined to 1125 mg/L,and the recovery of phenols was up to 98.7% by calculations.Later,Fenton oxidation technology was used to further remove the phenolic compounds in filtrate. The results show that under optimized conditions (pH=3,c(Fe²⁺)=1 mmol/L),the residual chlorophenols can be degraded effectively with H₂O₂ consumption of 15 mL/L,and the degraded solution is colorless and transparent when adjusting its pH to 10 to precipitate the ferrous and ferric irons. After combined treatments,the COD reduces to 52 mg/L,which the value can meet the national sewage effluent discharge standards.
- phenolic wastewater,
- recovery,
- removal,
- chlorination,
- oxidation
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