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Method for recycling magnesium oxalate in case of treating sewage containing benzene-based 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 non-environmental protection, complicated operation, high cost, etc., and achieve low cost, good treatment effect, The effect of easy operation

Inactive Publication Date: 2014-02-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current problems of complex operation, high cost and environmental protection in the treatment of sewage containing benzene pollutants, the present invention provides a method for recovering magnesium oxalate when treating sewage containing benzene pollutants, a method for ozonation treatment of benzene containing benzene A method of reclaiming magnesium oxalate while effectively degrading pollutants while obtaining recyclable magnesium oxalate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 sewage treated in step A) into the ozone aeration tank, add brucite to the sewage, the amount of brucite added 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 100 L / 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 known 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) Introduce the sewage treated in step B) into a sedimentation tank for sedimentation and separation; obtain 500 m...

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 100 L / 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. TOC removal rate 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. The brucite was replaced by brucite (light magnesium ore) calcined at 650°C, the addition amount was 1200mg, so that C:Mg=2:1, the ozone concentration was 23mg / l, and the gas flow rate was 80 L / hr, aeration 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 remova...

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Abstract

The invention discloses a method for recycling magnesium oxalate in the case of treating sewage containing benzene-based pollutants, and belongs to the field of the treatment of sewage containing the benzene-based pollutants. The method mainly comprises the following steps: A), filtering sewage to be treated to remove suspended matters in the sewage; B), introducing the sewage treated through the step A) to an ozone aeration tank, adding brucite into the sewage, and then performing ozone aeration; C), introducing the sewage treated through the step B) to a settling pond to be subjected to precipitation separation; D), dehydrating and drying sediments at the bottom of the settling pond, so as to obtain magnesium oxalate crystals. According to the invention, the pollutants can be effectively degraded while the magnesium oxalate which can be used as a resource can be obtained; the method has the advantages of simplicity, convenience for operation, low cost and environment protection.

Description

technical field [0001] The invention relates to the field of sewage treatment containing benzene pollutants, in particular to a method for recovering magnesium oxalate when treating sewage containing benzene pollutants. Background technique [0002] Phenol is an important industrial raw material and intermediate product. It exists in various industrial wastewater and is weakly acidic in aqueous solution. Phenol is extremely toxic, even in low concentrations, it is very harmful to the human body, and it has "three causes" effects, namely teratogenic, carcinogenic and mutagenic effects. There are many types of sewage containing benzene pollutants, such as industrial sewage containing phenol, phthalic acid, nitrobenzene, aniline, etc. Phenolic sewage mainly comes from petrochemical plants, resin plants, coking plants, and oil refineries. The common characteristics of this kind of sewage are high COD concentration, high toxicity and low biodegradability. Common treatment tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C55/07C07C51/41C02F101/32
Inventor 尹琳朴海涛张亚平何其慧
Owner NANJING UNIV
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