Advanced treatment of petrochemical secondary effluent by Fenton: performance and organics removal characteristics.
The Fenton process was used to treat petrochemical secondary effluent. The effects of initial pH, H2O2, and FeSO4·7H2O dosages on chemical oxygen demand (COD) removal, the dissolved organic matter (DOM) removal and the transformation and migration of typical organic matters during the treatment process were investigated. The results showed that the optimum conditions were initial pH of 3.0, H2O2(30%) dosage of 0.4 mL/L, and FeSO4·7H2O dosage of 1.0 g/L. The highest COD removal efficiency of 61.9% could be achieved for this condition when the average influent COD was 78.5 mg/L. Most of the DOM in the petrochemical wastewater could be removed effectively by Fenton through direct oxidation and coagulation. For example, for trans-1,2-dichlorocyclopentane, results showed that 56.3% of it could be removed by Fenton oxidation, while 13.3% of it could be absorbed by the in situ generated Fenton chemical sludge. The Fenton process is simple and it is suitable for the advanced treatment of petrochemical secondary effluent.
College of Water Science, Beijing Normal University, Beijing 100875, China; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Min
M
Xu
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China E-mail: zhouyuexi@263.net; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Changyong
C
Wu
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China E-mail: zhouyuexi@263.net; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Yuexi
Y
Zhou
D057919:Biological Oxygen Demand Analysis; D008401:Gas Chromatography-Mass Spectrometry; D006838:Hydrocarbons / Q000302:isolation & purification*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D006838:Hydrocarbons; D006861:Hydrogen Peroxide; D007501:Iron; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical; C045076:Fenton's reagent