A method for recovering magnesium oxalate when treating sewage containing benzene pollutants
A pollutant, magnesium oxalate technology, applied in the direction of water pollutants, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of complex operation, high cost, not environmental protection, etc., and achieve good treatment effect and low cost , the effect of convenient operation
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Embodiment 1
[0029] A method for treating sewage containing benzene pollutants, the steps of which are:
[0030] A) Filter the sewage to be treated to remove suspended solids; the sewage to be treated is artificially prepared 1000ml of artificial sewage with a phenol concentration of 4700mg / l and a TOC concentration of 3590mg / l.
[0031] B) introduce the treated sewage in step A) into the ozone aeration tank, add brucite to the sewage, the addition of brucite is 580mg, so that C:Mg=30:1; then carry out ozone aeration, The concentration of ozone is 43mg / l, the gas flow rate is 100L / hr, the aeration is 60min, and the addition amount of ozone is O 3 / TOC=1.19g / Kg. From the monitoring data, it can be seen that the pH value of the aqueous solution is controlled between 3.1-4.5 from the start of aeration for 1 minute except for the pH value of 10.1 before aeration.
[0032] C) introducing the sewage treated in step B) into a sedimentation tank for sedimentation and separation; obtaining 500 mg...
Embodiment 2
[0035] Same as Example 1, the difference is that the sewage to be treated in step A) is artificially prepared 1000ml of artificial sewage with a phenol concentration of 4000mg / l and a TOC concentration of 3000mg / l. The amount of brucite added is 680mg, after adding, C:Mg=15:1, the ozone concentration is 43mg / l, the gas flow rate is 100L / hr, and the aeration is 30min, so that O 3 / TOC=0.72g / Kg. Monitor the pH value of the aqueous solution except 9.7 before the aeration, and the pH value of the system is controlled between 2.4-3.9 from 1 minute after the aeration starts.
[0036] After 30 minutes, the aeration was stopped, and 620 mg of precipitate was obtained, which was filtered out and dried at 145°C. XRD (X-ray Powder Diffraction) was used to confirm that the precipitate was all magnesium oxalate, and magnesium oxide was not detected. The removal rate of TOC is 83%.
Embodiment 3
[0038]Same as Example 1, the difference is that the sewage to be treated in step A) is artificially prepared 1000ml of artificial sewage with a phenol concentration of 600mg / l and a TOC concentration of 450mg / l. Brucite was replaced by brucite (light magnesium ore) calcined at 650°C, the amount added was 1200mg, so that C:Mg=2:1, the concentration of ozone was 23mg / l, and the gas flow rate was 80L / hr, aeration for 20min, making O 3 / TOC=1.33g / Kg. Monitor the pH value of the aqueous solution, except 11.1 before aeration, and control the pH value of the system between 4.5-10.2 from 1 minute after the aeration starts. When the reaction was terminated, pH=10.2.
[0039] After 20 minutes, the aeration was stopped, and 998 mg of precipitate was obtained, which was filtered out and dried at 140°C. Use XRD (X-ray powder diffraction) to confirm that the precipitate is magnesium carbonate dihydrate (MgCO 3 2H 2 O) Mixture with brucite. Magnesium oxalate was not seen. TOC removal...
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