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Pilot Study on Treatment of Fluoride-containing Wastewater by Loading Flocculation Process

Author: WangBinYuan
Tutor: ChenZhongLin
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Fluoride wastewater Loaded flocculation Calcium salt coagulation and sedimentation Pilot
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 128
Quote: 0
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Abstract


Fluorinated industrial wastewater involves many industries, iron and steel, non-ferrous metal smelting, aluminum, glass, chemical fertilizers, organic fluorine chemical, semiconductor electronics industry and the aerospace industries, involving a wide range of great harm. The traditional process - calcium salt coagulation and sedimentation process exists treatment effect, the process running unstable calcium salt effective utilization is low, the volume of sludge generated, the processing cost of drawbacks. Defluoridation performance and mechanism on the basis of the system of traditional crafts, the introduction of a new efficient flocculation process to load the flocculation process, as the return sludge flocculation carrier \effect, reduce water treatment costs. On fluoride removal performance and mechanism of precipitation of calcium salts coagulation. The experiments show that the dosing of the fluorine-containing industrial waste water, lime of Ca (OH) 2 or calcium chloride CaCl2, F-and calcium Ca , 2 react to generate calcium fluoride, to increase [Ca 2 ] / [F-] molar ratio can be reduced the residual fluorine ion concentration in the solution. [The of Ca 2 ] / [F-] molar than the best range of TSP force dissolved Shen 0. Solutions drop 5 property. Growth pole 0. Difference plus anti. , Should be required to fluorine body calcium p coagulation system mixed H Shen value lake species of small degranulation in addition to Path 2. .50 Iron .2 or 2 salt 6 ± fluorine on deposit 0 .1 0 of 4N calcium μOm 3 -, and compared to S-band O over 4 2 - Strong mixing is overcast Coagulation leaving Dutch child in addition to the aging teeth the berry fluorine, overcast, of ionic PAM coagulant aid effect. The loaded flocculation process containing Wastewater trial, the sludge backflow improve the effect of fluoride removal system. Wastewater flow of 2m3 / h, sludge return more than 50 percent, adding lime to adjust the pH value of 11, then adding sulfuric acid anti adjusted to pH 8.5, dosing 0.15mmol / L ferric chloride coagulant, and 3mg/LPAM mixed condensate precipitated shipped 2 in addition to the 1.4 rate line to 8 ± steady at 0.95 segment 82.N0 order T0% U (T by the residue of the Technology ± technique of water SD) economy, I tied fluorine change the system good concentrated shipped Ming line of remarkable stability. Given 0, ± 0 67 fluoride level .1 5m g / addition to L (for F 9 ± 6 S.D31%) voiced out-degree level cloud degrees to preliminary elaborated loaded flocculation process for removing fluoride mechanism: the sludge loading agent to increase the effective contact collision, the formation of the \calcium fluoride crystal growth, to improve the removal of fluoride ions; calcium release process, to improve the effective utilization of the calcium hydroxide and the fluoride ion removal.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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