Acid mine wastewater treatment and resource utilization method
A technology for recycling acidic mine wastewater, applied in the field of environmental engineering, can solve problems such as acid inrush water pollution, and achieve the effects of reducing the content of metal ions in wastewater, reducing costs, and reducing sludge production
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Embodiment 1
[0022] see figure 1 As shown, the technical solution adopted in this specific embodiment is: a closed coal mine wastewater treatment project, the wastewater volume is 100m3 / h. The wastewater first flows into the aeration tank for aeration for 10 hours, adding sodium hydroxide to adjust the pH to 7, then the wastewater enters the sedimentation tank and stays for 5 hours, the bottom sediment is pumped into the sludge tank, and the sludge is naturally dried in the sludge tank. That is to obtain ferric hydroxide with higher purity. Continue to add neutralizers such as lime compound alkali to the supernatant to adjust the pH to 9.5. After precipitation, the supernatant reaches the standard and is discharged, and the precipitated sludge is dehydrated and then sent out for treatment.
Embodiment 2
[0024] see figure 1 As shown, the technical scheme adopted in this specific embodiment is: take 2L of waste water from a certain closed coal mine in a beaker, feed oxygen into it for 4 hours with an aerator, and wherein the air pressure is 0.5Mpa, so that the divalent iron in it is oxidized to trivalent , the solution turned reddish brown. Add 10ml of sodium hydroxide solution (30% by mass) into the beaker and stir for 2min to adjust the pH to 5.7 to obtain a solution containing ferric hydroxide. The solution was filtered, washed with distilled water, air-dried and ground to obtain high-purity ferric hydroxide powder, which weighed 2.7 g. Add lime milk to the filtrate to adjust the pH to 9.5, add PAM and mix thoroughly for 2 minutes, filter again and test the filtrate, the iron concentration is 1.2ppm, and manganese is not detected, meeting the discharge standard.
Embodiment 3
[0026] see figure 1 As shown, the technical solution adopted in this specific embodiment is: take 2L of wastewater from a closed coal mine in a beaker, add 12mL of sodium hydroxide solution (20% by mass) to the wastewater and stir to adjust the pH to 4.3. Then, air is introduced to oxidize ferrous iron to ferric iron. The air pressure is 0.5Mpa, and the aeration is performed for 3 hours. If the solution appears reddish brown, the aeration oxidation is completed, and a solution containing ferric hydroxide is obtained. The solution is filtered and the filter cake is washed, and the filter cake is air-dried and ground to obtain high-purity sodium hydroxide powder. Add lime milk to the filtrate to adjust the pH to 9, add PAM and stir and mix for 2 minutes, filter again and test the filtrate, the iron concentration is 1.5ppm, manganese is not detected, and the discharge standard is met.
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