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Pulse Electrocoagulation Applied on Recalcitrant Dye Wastewater Treatment

Author: ChenYiMin
Tutor: ZhouBaoXue
School: Shanghai Jiaotong University
Course: Environmental Science
Keywords: Pulse electroflocculation Refractory Energy-saving Wastewater treatment
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 230
Quote: 1
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Abstract


In this paper, a combination of pulse power technology with electroflocculation technology to recalcitrant Direct Scarlet 4BS dye represented by the influencing factors of iron, aluminum for the electrode pulse electroflocculation technology of biodegradable dye wastewater treatment , the treatment effect as well as energy-saving situation to provide an experimental basis for the application of the pulse electroflocculation engineering . The contents and results are as follows: 1 . The aluminum anode pulse electroflocculation of optimum conditions for direct scarlet 4BS wastewater treatment : the duty cycle of 0.4 , the pulse frequency of 0.2 KHz , the current density of 16.8 mA/cm2 ( current of 0.2 A ) processing time of 60 min , the decolorization rate up to 97.07% , COD removal rate was 89.89% . Under the same conditions , the pulse ( Promise of exchange ) and polarity switching pulse electroflocculation showed good energy saving effect compared with the DC flocculation , energy consumption decreased by 30% and 35% respectively , the decolorization rate and COD treatment effect equivalent, but the the polarity exchange pulse electric flocculation electrode supplies large the pulsed electrodeposition flocculation electrode supplies with DC flocculation is roughly equal . Iron-based anode pulse electroflocculation direct scarlet 4BS optimum conditions of simulated wastewater treatment : the duty cycle of 0.1 , the pulse frequency of 0.2 KHz , initial pH and the steady state of pH 4 to 9 , the current density of 16.8 mA/cm2 ( current of 0.2 A ) , when the processing time of 15 min , the decolorization rate up to 99 % COD removal efficiency of up to 91% . Compared with DC Electrocoagulation the pulse electroflocculation (no polarity exchange) not only can reduce the energy consumption of about 51.66% , improve power utilization and DC Electrocoagulation decolorization rate (99 % ) , the COD removal efficiency ( 91% above ) on the effect is quite basic . The impact of various parameters on the system of the two kinds of electrode materials approximate However with than aluminum anode pulse electroflocculation , iron-based anode pulse electroflocculation of 4BS dye wastewater processing speed to about 8 times faster . Compared with DC flocculation , two electrode material pulse electroflocculation energy has been a significant decline; two electrode material pulse electroflocculation material consumption are similar to the DC Electrocoagulation polarity exchange situation , but a certain cycle the under the aluminum anode pulse electroflocculation in material consumption than DC flocculation high .

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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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