Method for treating washing wastewater of coal chemical industry

A treatment method and technology of coal chemical industry, applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high organic concentration, poor biodegradability, high ammonia nitrogen concentration, and achieve sludge concentration Low, fast filtration, high concentration effect

Active Publication Date: 2020-02-07
神美科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the treatment process of high-concentration COD and ammonia nitrogen wastewater in the coal chemical industry, the present invention provides a treatment method for the washing wastewater of the coal chemical industry, which mainly solves the problems of high organic matter concentration, high ammonia nitrogen concentration, poor biodegradability and degradation in the coal chemical industry washing wastewater. Incomplete question

Method used

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  • Method for treating washing wastewater of coal chemical industry
  • Method for treating washing wastewater of coal chemical industry
  • Method for treating washing wastewater of coal chemical industry

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1. Magnetic flocculation precipitation

[0029] Adjust 10L of waste water to pH 8 with sodium hydroxide, then add 6g of polyaluminum chloride to it, and add 2g of magnetic powder at the same time to make it integrate with pollutant flocculation and produce a large number of flocculent alum flowers. After settling for 5 minutes, filter and separate , The magnetic powder is recycled and reused, the sludge is treated as solid waste, and the filtrate is processed in the next step. After testing, the COD concentration in the filtrate was 5073mg / L, the BOD concentration was 1317mg / L, the ammonia nitrogen concentration was 330mg / L, and the pyridine concentration was 47.9mg / L. The corresponding removal rates of the first three were 8.15%, 3.52%, and 8.84%, respectively.

[0030] 2. UV-activated persulfate oxidation

[0031] In the filtrate that step 1 obtains, add sulfuric acid to adjust pH to 3, then in intensity 9mW / cm 2Sodium persulfate was added under ultraviolet light, s...

Embodiment 2

[0041] 1. Magnetic flocculation precipitation

[0042] Adjust 10L of waste water to pH 8 with sodium hydroxide, then add 2g of polyaluminum chloride to it, and add 1g of magnetic powder at the same time to make it flocculate and combine with pollutants to form a large amount of flocculent alum flowers. After settling for 15 minutes, filter and separate , The magnetic powder is recycled and reused, the sludge is treated as solid waste, and the filtrate is processed in the next step.

[0043] 2. UV-activated persulfate oxidation

[0044] In the filtrate that step 1 obtains, add sulfuric acid to adjust pH to 3, then in intensity 9mW / cm 2 Sodium persulfate was added under ultraviolet light to make the concentration of sodium persulfate in the filtrate 1.5mmol / L, and the reaction was stirred and reacted at 100r / min for 20min.

[0045] 3. Photoelectric-Fenton oxidation

[0046] The filtrate treated in step 2 was adjusted to pH 4 with sodium hydroxide, and then Na was added 2 SO ...

Embodiment 3

[0048] 1. Magnetic flocculation precipitation

[0049] Adjust 10L of waste water to pH 8 with sodium hydroxide, then add 8g of polyaluminum chloride to it, and add 5g of magnetic powder at the same time to make it flocculate and combine with pollutants to form a large amount of flocculent alum flowers. After settling for 10 minutes, filter and separate , The magnetic powder is recycled and reused, the sludge is treated as solid waste, and the filtrate is processed in the next step.

[0050] 2. UV-activated persulfate oxidation

[0051] In the filtrate that step 1 obtains, add sulfuric acid to adjust pH to 4, then in the intensity of 11mW / cm 2 Sodium persulfate was added under ultraviolet light, so that the concentration of sodium persulfate in the filtrate was 1.0 mmol / L, and the reaction was stirred and reacted at 100 r / min for 40 min.

[0052] 3. Photoelectric-Fenton oxidation

[0053] The filtrate treated in step 2 was adjusted to pH 3 with sodium hydroxide, and then Na ...

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Abstract

The invention discloses a method for treating washing wastewater of coal chemical industry. The method comprises the following steps: firstly, carrying out partial removal on tar, suspended impuritiesand other macromolecular substances in the wastewater through a magnetic flocculation precipitation strengthening flocculation effect, then carrying out ultraviolet activated persulfate oxidation toexcite generation of sulfate radicals, effectively carrying out ring opening on refractory organic matters such as pyridine and quinoline to be decomposed into easily degradable substances such as allyl alcohol and acetamide, and thus improving the removal rate of the refractory organic matters and improving the biodegradability of the wastewater; reusing an photoelectric-Fenton oxidation method,producing a Fenton reagent by using an electrochemical method to treat the wastewater, and meanwhile, introducing ultraviolet light, wherein the ultraviolet light and Fe<2+> have a synergistic effecton the catalytic decomposition of H2O2, so that the decomposition rate is greatly improved, the refractory organic matters can be effectively treated, the degree of mineralization is high, secondary pollution cannot be generated, the operation is simple, the control parameters are only voltage and current, and the automatic control can be conveniently realized.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for coal chemical industry washing wastewater with high organic matter concentration, high ammonia nitrogen concentration and poor biodegradability. Background technique [0002] Coal chemical industry is an industry that chemically processes coal to produce gas, liquid and other related bodies. Due to the difference between the production process and the final product, the wastewater discharged by coal chemical enterprises mainly comes from the four aspects of coking, gasification, liquefaction and calcium carbide, among which there are many washing wastewater with high toxicity and high concentration, containing a large amount of Toxic and harmful substances such as phenol, cyanide, oil, ammonia nitrogen, etc. COD in wastewater is generally about 5000mg / L, ammonia nitrogen is 200-500mg / L, and the biodegradability is poor. Organic po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/30
CPCC02F9/00C02F1/5245C02F1/4672C02F1/32C02F1/488C02F2101/30
Inventor 郑搏英庞宏磊崔秀菊张襄丁海静
Owner 神美科技有限公司
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