A method and device for treating semi-coke wastewater

A semi-coke wastewater and treatment method technology, applied in water/sewage treatment, water/sewage multi-stage treatment, degassed water/sewage treatment, etc., can solve low removal efficiency, microbial toxicity in biochemical section, and difficult biochemical degradation To achieve the effect of improving the efficiency of extraction and dephenolization, enhancing the anti-fouling performance and improving the operation stability

Active Publication Date: 2022-01-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the national environmental protection department has proposed a new standard of "zero liquid discharge" for coal chemical wastewater: in the process of realizing "zero liquid discharge", higher requirements are put forward for the removal efficiency of phenol, oil, and ammonia nitrogen; while the traditional The phenol ammonia recovery process is not efficient enough to remove phenol, oil and ammonia nitrogen, and the residual phenol and oil are highly toxic to microorganisms in the biochemical section, which affects the stable operation of the system
[0008] The defects and deficiencies of the existing phenolic ammonia recovery technology are mainly as follows: ①The gravity settling tank cannot effectively remove oil and suspended solids, and the effluent water quality cannot meet the water quality indicators required by the phenolic ammonia recovery system
Wastewater containing oil and suspended solids entering the deacidification and deamination unit is likely to cause blockage of the trays, which not only affects the efficiency of deacidification and deamination of wastewater, but also affects the stability of the phenol ammonia recovery system.
② After removing acid gas and ammonia nitrogen, the pH value of the wastewater is reduced to 7-8, and the removal efficiency of phenolic substances and other organic pollutants is low under weakly alkaline conditions. Phenol index is still around 700mg / L, COD index is still around 5500mg / L
This is not ideal for subsequent treatment to degrade phenolic substances and total COD indicators in wastewater
③The solubility of the complex extraction agent in water is usually about 1000mg / L, there is no effective means to recover the extraction agent and it is difficult to biochemically degrade itself, and the introduction of the extraction agent in the wastewater increases the biochemical load

Method used

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  • A method and device for treating semi-coke wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The flow rate is 100t / h, the total phenol content is about 12000mg / L, the total ammonia content is about 2500mg / L, the CO 2 Content about 3400mg / L, H 2 S content is about 80mg / L, oil content is about 1200mg / L, COD Cr The value is about 35000mg / L, the pH value is 7.8, the chromaticity is 22000 times, and the water temperature is 37℃. figure 1 process as shown. The extractant uses MIBK, the mol ratio of NaOH in the 20wt% NaOH solution and the fixed ammonium in the still liquid of the solvent stripping tower is 1:0.98, and the parameters such as the number of stages, pressure and temperature of each tower are as follows:

[0061] The acid adding device adjusts the pH value of the semi-coke wastewater to 5.1, and the added acid is concentrated sulfuric acid, which is uniformly mixed and left to stand for 2.5 hours.

[0062] The deacidification tower has 15 theoretical stages, the ratio of cold and hot feeds is 3:17, the temperature at the top of the tower is 38°C, the pr...

Embodiment 2

[0069] The flow rate is 20t / h, the total phenol content is about 14000mg / L, the total ammonia content is about 2300mg / L, the CO 2 Content about 3000mg / L, H 2 S content is about 100mg / L, oil content is about 1500mg / L, COD Cr Value of about 48000mg / L, chromaticity of 25000 times, pH value of 7.5, water temperature of 40 ℃ to be treated blue charcoal wastewater by figure 1 process as shown. The extraction agent uses a mixed extraction agent (the volume ratio of MIBK and n-PTL is 3:2), the molar ratio of NaOH in the 20wt% NaOH solution to the fixed ammonium in the solvent stripping column liquid is 1:0.95, and the stages of each column , pressure, temperature and other parameters are as follows:

[0070] The acid adding device adjusts the pH value of the semi-coke wastewater to 4.8, and the added acid is concentrated sulfuric acid, which is uniformly mixed and left to stand for 5 hours.

[0071] The deacidification tower has 13 theoretical stages, the ratio of cold and hot fee...

Embodiment 3

[0078] The flow rate is 300 tons / hour, the total phenol content is about 8000mg / L, the total ammonia content is about 3300mg / L, CO 2 Content about 4000mg / L, H 2 S content is about 50mg / L, oil content is about 1300mg / L, COD Cr Value is about 30000mg / L, chromaticity is 25000 times, pH value is 8.4, water temperature 35℃ figure 1 process as shown. The extractant uses DIPE, the molar ratio of NaOH in the 20wt% NaOH solution to the fixed ammonium in the still liquid of the solvent stripping tower is 1:0.98, and the parameters such as the number of stages, pressure and temperature of each tower are as follows:

[0079] The acid adding device adjusts the pH value to 5.0, and the added acid is concentrated sulfuric acid, which is uniformly mixed and left to stand for 3.5 hours.

[0080] The deacidification tower has 14 theoretical stages, the ratio of cold and hot feed is 3:16, the temperature at the top of the tower is 36°C, the pressure is 0.1MPa, the temperature at the bottom of...

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Abstract

The invention belongs to the technical field of sewage treatment, and discloses a method and a device for treating blue charcoal wastewater. The method is as follows: adjust the pH value of the semi-coke wastewater through an acid adding device, and then let it stand to realize gravity degreasing and separate recovery; the hot and cold streams of the effluent water enter the stripping tower from the upper and middle upper parts of the deacidification tower, and remove The acid gas in the wastewater is sent to the tail gas treatment device; the kettle liquid and the extractant are extracted countercurrently, and the extract phase is separated by rectification to recover the extractant and obtain crude phenol products; The ammonia nitrogen in the water is removed by tower steaming to prepare concentrated ammonia water; the invention can realize the efficient separation and recovery of light oil, heavy oil, acid gas, phenols, and ammonia nitrogen in the semi-coke wastewater, and realize the resource utilization of pollutants. It can be recycled in the wastewater treatment process, and the wastewater treatment system does not introduce new impurities, so it has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a semi-coke wastewater treatment method and device. Background technique [0002] The status of coal in the field of energy and chemical industry is getting higher and higher. Among them, industries such as coal-to-gas, coal-to-oil, and coal-to-semi-coal are developing rapidly and are widely used in new coal chemical projects. Semi-coke wastewater is wastewater produced during coal dry distillation at medium and low temperatures (600-800°C). It is rich in refractory organic pollutants such as tar, phenol, and ammonia nitrogen. The water quality is very complex, difficult to treat, and environmentally harmful. The treatment of such wastewater is a difficult problem in the field of water treatment, and it is also one of the important factors restricting the development of the coal chemical industry. [0003] This kind of wastewater contains a large amount of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/16C02F101/30C02F101/34
CPCC02F9/00C02F1/66C02F1/40C02F1/04C02F1/10C02F1/20C02F1/26C02F2101/30C02F2101/16C02F2101/345
Inventor 杨思宇陈博坤曹琦钱宇
Owner SOUTH CHINA UNIV OF TECH
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