Treatment of pharmaceutical wastewater containing recalcitrant compounds in a Fenton-coagulation process.
The advanced treatment using integrated Fenton's reaction and coagulation process was investigated in this study. Before the advancement, the pharmaceutical wastewater containing lincomycin hydrochloride was pretreated by UASB (upflow anaerobic sludge bed) and a SBR (sequencing batch reactor) process. The residual recalcitrant compounds, measured by gas chromatography-mass spectrometry (GC-MS), mainly consisted of alcohols, phenols, and nitrogenous and sulfur compounds. The experimental results indicated that when the Fenton's reaction was conducted at pH = 3.0, H2O2/COD(Cr) = 0.27, H2O2/Fe2+ = 3:1 and 30 min of reaction time, and the coagulation process operated at a sulfate aluminum concentration of 800 mg/L and pH value of 5.0, the color and COD in the wastewater decreased by 94% and 73%, respectively; with a finale COD concentration of 267 mg/L and color level of 40 units, meeting the secondary standard of GB8978-1996 for industrial wastewater.
Xing
Mei-Yan
MY
College of Environmental Science and Engineering, Tongji University, Shanghai 200092,China. xmy_1977@163.com
Can
Deng
D
Godefroid
Bukuru
B
Yang
Jian
J
D000534:Alum Compounds; D002681:China; D005427:Flocculation; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry; D004364:Pharmaceutical Preparations / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014877:Water Pollution, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D000534:Alum Compounds; C045076:Fenton's reagent; D009930:Organic Chemicals; D004364:Pharmaceutical Preparations; C041524:aluminum sulfate; D006861:Hydrogen Peroxide; D007501:Iron