Method for recovering and treating chromium-containing wastewater by using magnetic nanoparticles
A magnetic nanoparticle, recycling technology, applied in the fields of magnetic field/electric field water/sewage treatment, water/sewage treatment, water treatment parameter control, etc., can solve the rising cost of chromium-containing wastewater, secondary organic pollution, and the use effect of magnetic particles Reduction and other problems, to achieve the effect of reducing the cost of pharmaceutical dosage and cost reduction
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Embodiment 1
[0060] In a 1.5-ton reaction kettle with mechanical stirring and electric heating device, add 1 ton of water and 235 kg of ferric chloride hexahydrate, raise and maintain the temperature to 80 degrees Celsius, add 120 kg of ferrous sulfate heptahydrate, and wait until completely After dissolving, add sodium hydroxide to adjust the pH value at about 11, react for 60 minutes, and the product undergoes solid-liquid separation and repeated washing with water to obtain a magnetic iron containing 100 kg. 3 o 4 The nanoparticle aqueous solution is ready for use.
[0061] TEM image reveals magnetic Fe 3 o 4 The average diameter of nanoparticles is about 10 nanometers, and the magnetic Fe is tested by a vibrating sample magnetometer 3 o 4 The specific saturation magnetization of the nanoparticles is 82emu / g.
[0062] 2. Magnetic separation of chromium in chromium-containing wastewater
Embodiment 2
[0064] In the continuous flow type chromium-containing waste water magnetic nano particle recovery treatment system comprising mixing unit operation (I), mixing unit operation (II), reaction unit operation (III), magnetic separation unit operation (IV) four unit operation devices, Press the flow rate of 2 tons / hour with metering pump, flow into unit operation (I)-(IV) successively successively to the low chromium waste water that contains trivalent chromium 100 mg / liter of tannery A factory, meanwhile, complete following unit operation:
[0065] (1) in mixing unit operation (1)-static pipeline mixer, by the speed of 100 liters / hour, continuously inject the lime aqueous solution that weight concentration ratio is 2%, make the pH value of chromium-containing waste water remain on about 10 all the time, Mix well;
[0066] Among them, the size of the static pipeline mixer is φ100*1000 mm, the internal structure adopts SV type five-section mixing, equipped with lime water dosing me...
Embodiment 3
[0073] In the continuous flow type chromium-containing waste water magnetic nano particle recovery treatment system comprising mixing unit operation (I), mixing unit operation (II), reaction unit operation (III), magnetic separation unit operation (IV) four unit operation devices, Press the flow rate of 2 tons / hour with metering pump, flow into the high-chromium waste water containing trivalent chromium 1500 mg / liter continuously to unit operation (I)-(IV) successively successively, at the same time, complete following unit operation:
[0074] (1) in mixing unit operation (1)-static pipeline mixer, by the speed of 200 liters / hour, continuously inject the lime aqueous solution that weight concentration ratio is 2%, make the pH value of chromium-containing waste water remain on about 9 all the time, Mix well;
[0075] Among them, the size of the static pipeline mixer is φ100*1000 mm, the internal structure adopts SV type five-section mixing, equipped with lime water dosing meter...
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