Electric flocculation water treatment technology for retarding pole plate passivation
A technology of electrocoagulation and water treatment, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of destroying the formation conditions of adsorbed flocs, weakening the degree of passivation, and reducing the yield of adsorbed flocs Reduce and other problems, achieve the effect of slowing down and anode passivation, eliminating anode passivation, and no maintenance time
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Embodiment 1
[0014] 1. A mixed cadmium-containing heavy metal wastewater, the influent cadmium content is 100mg / L, adjust the pH value of the wastewater to 7, adjust the conductivity to 500us / cm, add sodium chloride to adjust the concentration of sodium chloride to 80mg / L, enter the intermittent electricity For flocculation system treatment, iron electrodes are used, the electrode distance is 5mm, the voltage of each pair of electrodes is set to 5V, and the anode and cathode are iron electrodes. After electrolysis for 60 minutes, the measured average current density is 8.3A / m 2 . After the electrocoagulation reaction, the mass concentration of heavy metal cadmium was reduced to 8.7mg / L, and the removal rate reached 92.3%.
[0015] Life test: The water inlet parameters are consistent with the above. After 200h of experiment, set the voltage of each pair of electrodes to 5V, electrolysis for 60min, and the measured average current density is 7.7A / m 2 , the mass concentration of metal cadmi...
Embodiment 2
[0018] A mixed chromium-containing heavy metal wastewater, the influent chromium content is 50mg / L, adjust the pH value of the wastewater to 3, adjust the conductivity to 300us / cm, add sodium chloride to adjust the concentration of sodium chloride to 40mg / L, and enter the intermittent electroflocculation system For the treatment, iron electrodes are used, the distance between the electrodes is 15mm, the voltage of each pair of electrodes is set to 3V, and the anode and cathode are aluminum electrodes. After electrolysis for 30 minutes, the measured average current density is 3.2A / m 2 . After the electrocoagulation reaction, the mass concentration of heavy metal cadmium was reduced to 5.1mg / L, and the removal rate reached 89.8%.
[0019] Life test: The water inlet parameters are consistent with the above. After 200h of experiment, set the voltage of each pair of electrodes to 3V, electrolyze for 30min, and the average current density is 4.4A / m 2 . The mass concentration of m...
Embodiment 3
[0022] A mixed nickel-containing heavy metal wastewater, the influent nickel content is 400mg / L, adjust the pH value of the wastewater to 5, adjust the conductivity to 3000us / cm, add sodium chloride to adjust the concentration of sodium chloride to 200mg / L, and enter the intermittent electrocoagulation system For the treatment, iron electrodes are used, the distance between the electrodes is 5mm, and the voltage of each pair of electrodes is set to 10V. After electrolysis for 40 minutes, the measured average current density was 29.3A / m 2 . After the electrocoagulation reaction, the mass concentration of heavy metal cadmium was reduced to 36.5mg / L, and the removal rate reached 92.7%.
[0023] Life test: The water inlet parameters are consistent with the above. After 200h of experiment, set the voltage of each pair of electrodes to 10V, electrolyze for 40min, and the measured average current density is 26.7A / m 2 . The mass concentration of metal cadmium was reduced to 60.90mg...
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