英语翻译1．3 Coagulation processExperiments (not presented here)c

英语翻译
1．3 Coagulation process
Experiments (not presented here)conducted on the pharmaceutical wastewater for the selection and optimization of coagulants(A12(504)3,polyaluminum chloride (PAC),FeC13 and polyferric sulfate(PFS))showed that A12(S04)3 performed well by far Thus,the
coagulation process was perform ed using sulfate aluminum (A12(SO4)3)as coagulant,at the pre-determined optimal concentration and pH value of 800 mg／L and 5,respectively．Atier the Fenton’s reaction． the coagu lant (A12(504)3)was added to the sample with rapid mixing at 300 r／min for 0．5 min,followed by slow mixing at
50 r／min for l 0 min．After 30 min of sedimentation．the supematant was withdrawn for COD and color analysis．
1．4 GC—MS analysis
0ne thousand milliliter of sample was introduced into a given beaker containing 1 00．0 txg of hexahy—drothymol as intemal standard． 1 0％ NaOH was employed to adjust the pH (pH≥l1)．Basic content of the sample were then extracted 3 times by 50 ml of dichloromethane．The pH of the remaining liquor was adjusted to a pH of 2 using 6 mol／L H2SO4,and acidic contents were extracted as described above The two
extracted liquors were brought together and dried for about 24 h by anhydrous sulfate sodium,and finally evaporated to 1．0 ml in K—D rKudema—Danish evaporator)．1．0 l of the remaining liquor was with
drawn for GC,M S analysis．Finnigan Voyager was used as analytical tool for gas chromatography—mass spectrometry (GC—MS)analysis,with DB．5 silica capillary column f30 m x 0．25 mm,0．25 m)．The column temperature was programmed from 50℃ rfor 2 rain)to 300cIC (for l0 min1 with a heating．up velocity of l 0℃ ／min,carrier gas of He was 1．0 ml／min．and fl split ratio of 20：1．Source temperature was held at 200oC．ionization en—ergy at 70 eV (electron volt)．Interpretation of the resulting chromatograms and mass spectra was performed using NIST(National Institute of Standards and Technology)library．