Acid-base generating device for treating coking wastewater by Fenton method

Abstract

The utility model discloses an acid-base generating device for treating coking wastewater by a Fenton method, which comprises a dispensing water tank, a feeder, an activated carbon adsorption tank, a filter, a resin adsorption tank, a saline water tank and a membrane stack. Reverse osmosis produced water of a coking wastewater treatment system serves as a water source, brine in a dispensing water tank is pretreated through activated carbon adsorption, filtration and resin adsorption, the water quality of the brine is guaranteed, an acid solution and an alkali solution are prepared from the pretreated brine through bipolar membrane electrodialysis and serve as acid and alkali agents needed for treating coking wastewater biochemical effluent through the Fenton method, and the brine is recycled. The resource utilization of the coking wastewater is realized, the use cost of acid and alkali is effectively reduced, and meanwhile, inconvenience caused by storage and transportation of sulfuric acid is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to an acid-base generating device for treating coking wastewater by the Fenton method, which is applicable to the preparation of acid solution and alkali solution. Background Technique

[0002] At present, the coking wastewater treatment generally adopts the treatment process of "pretreatment + biochemical treatment + advanced treatment". The pollutants in coking wastewater have the characteristics of high concentration, strong biological toxicity, high chroma, and poor biodegradability. After biochemical treatment, there are still some organic pollutants in the effluent quality. Most of the advanced oxidation processes are used for the advanced treatment of coking wastewater to further remove the organic matter in the effluent of the biochemical process. The Fenton oxidation method is a commonly used method for treating refractory wastewater.

[0003] The Fenton system mainly uses Fe 2+ to react with hydrogen peroxide to generate hydroxyl radicals, which have strong oxidation ability in acidic aqueous solution and can degrade the organic pollutants in wastewater well, and the reaction rate is relatively fast. During the process of treating wastewater by the Fenton method, sulfuric acid needs to be continuously added to adjust the pH of the wastewater to 2-4. After the reaction, alkali solution also needs to be added to adjust the pH back to 7-8 to ensure that Fe 3+ is converted into ferric hydroxide precipitate. The alkali solution added in the Fenton method accounts for 40% of the chemical agent cost, and the sulfuric acid used in the Fenton method has problems in storage and transportation, resulting in high operation cost and inconvenient operation management for treating coking wastewater by the Fenton method. Content of the Utility Model

[0004] The purpose of the utility model is to provide an acid-base generating device for treating coking wastewater by the Fenton method in view of the above problems existing in the prior art.

[0005] The above object of the utility model is achieved by the following technical means:

[0006] An acid-base generating device for treating coking wastewater by the Fenton method includes a medicine preparation water tank, a feeding machine, an activated carbon adsorption tank, a filter, a resin adsorption tank, and a brine tank. The feeding machine is arranged on the top of the medicine preparation water tank. The water outlet of the medicine preparation water tank is connected to the water inlet of the activated carbon adsorption tank through a lift pump. The water outlet of the activated carbon adsorption tank is connected to the water inlet of the filter. The water outlet of the filter is connected to the water inlet of the resin adsorption tank. The water outlet of the resin adsorption tank is connected to the water inlet of the brine tank. A stirrer is arranged in the medicine preparation water tank. A medicine preparation makeup water pipe and a brine circulation pipe are arranged on the top of the medicine preparation water tank. A ball valve is arranged on the medicine preparation makeup water pipe. A brine circulation port is opened on the brine tank. The water inlet of the brine circulation pump is connected to the brine circulation port of the brine tank. The water outlet of the brine circulation pump is connected to the brine circulation pipe of the medicine preparation water tank.

[0007] An acid-base generating device for treating coking wastewater by the Fenton method further includes a membrane stack, which includes electrode plates, an electrode liquid chamber, an acid chamber, a base chamber, and a feed liquid chamber. The electrode plates are connected to a power supply through cables; the water inlet of the acid chamber is connected to the water outlet of the acid liquid water tank through an acid liquid circulation pump, and the water outlet of the acid chamber is connected to the water inlet of the acid liquid water tank through an acid liquid return pipe; the water inlet of the base chamber is connected to the water outlet of the base liquid water tank through a base liquid circulation pump, and the water outlet of the base chamber is connected to the water inlet of the base liquid water tank through a base liquid return pipe; the water inlet of the electrode liquid chamber is connected to the water outlet of the electrode liquid water tank through an electrode liquid circulation pump, and the water outlet of the electrode liquid chamber is connected to the water inlet of the electrode liquid water tank through an electrode liquid return pipe; the water inlet of the feed liquid chamber is connected to the water outlet of the brine tank through a brine return pump, and the water outlet of the feed liquid chamber is connected to the water inlet of the brine tank through a brine return pipe.

[0008] As described above, the feeder includes a feed bin and a discharger. The upper part of the feed bin is cylindrical, the lower part of the feed bin is inverted conical, a discharger is arranged at the bottom of the feed bin, a discharge pipe is arranged at the bottom of the discharger, and the discharge pipe extends into the chemical dosing water tank. A cover plate is arranged at the top of the feed bin, and a feed inlet is opened on the cover plate. The feed inlet of the feeder is connected to the loading machine, and an ultrasonic distance measuring instrument is also arranged in the feed bin.

[0009] As described above, a staircase platform is arranged on the side of the chemical dosing water tank, and the staircase platform is at the same height as the chemical dosing water tank.

[0010] As described above, liquid level sensors and conductivity meters are arranged in the chemical dosing water tank, acid liquid water tank, base liquid water tank, and brine tank.

[0011] As described above, a base liquid make-up water pipe is also arranged on the base liquid water tank, an acid liquid make-up water pipe is also arranged on the acid liquid water tank, and ball valves are arranged on both the acid liquid water tank and the base liquid make-up water pipe.

[0012] As described above, the acid liquid water tank and the base liquid water tank are both arranged in multiple groups. The water inlet of each group of acid liquid water tanks is connected to the water outlet of the acid chamber, and the water outlet of each group of acid liquid water tanks is connected to the water inlet of the acid chamber through an acid liquid circulation pump; the water inlet of each group of base liquid water tanks is connected to the water outlet of the base chamber, and the water outlet of each group of base liquid water tanks is connected to the water inlet of the base chamber through a base liquid circulation pump.

[0013] The utility model has the following beneficial effects compared with the prior art:

[0014] The utility model uses sodium sulfate obtained from the resource utilization of coking wastewater as a raw material, takes the reverse osmosis produced water of the coking wastewater treatment system as a water source, and adopts "activated carbon adsorption + filtration + resin adsorption" to pretreat the brine in the dosing water tank to ensure the water quality of the brine. The pretreated brine is used to prepare acid solution and alkali solution through bipolar membrane electrodialysis, which are used as acid and alkali agents required for treating the biochemical effluent of coking wastewater by the Fenton method, realizing the resource utilization of coking wastewater, effectively reducing the usage cost of acid and alkali, and at the same time avoiding the inconvenience caused by the storage and transportation of sulfuric acid. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] Reference numerals and corresponding component names:

[0017] 1 - dosing water tank; 2 - feeding machine; 3 - mixer; 4 - dosing makeup water pipe; 5 - staircase platform; 6 - lift pump; 7 - brine circulation pipe; 8 - activated carbon adsorption tank; 9 - filter; 10 - resin adsorption tank; 11 - brine tank; 12 - brine reflux pump; 13 - brine reflux pipe; 14 - membrane stack; 15 - power supply; 16 - electrode solution tank; 17 - electrode solution circulation pump; 18 - acid solution tank; 19 - acid solution circulation pump; 20 - alkali solution tank; 21 - alkali solution circulation pump; 22 - alkali solution makeup water pipe; 23 - acid solution makeup water pipe; 24 - acid solution reflux pipe; 25 - alkali solution reflux pipe; 26 - electrode solution reflux pipe; 27 - brine circulation pump. Detailed Embodiments

[0018] In order to facilitate the understanding and implementation of the utility model by those of ordinary skill in the art, the following further describes the utility model in detail with reference to the embodiments. The embodiments described herein are only used to illustrate and explain the utility model and are not intended to limit the utility model.

[0019] Embodiment 1:

[0020] An acid-base generating device for treating coking wastewater by the Fenton method, comprising a medicine preparation water tank 1, a feeding machine 2, an activated carbon adsorption tank 8, a filter 9, a resin adsorption tank 10, and a brine tank 11. The feeding machine 2 is arranged on the top of the medicine preparation water tank 1. The water outlet of the medicine preparation water tank 1 is connected to the water inlet of the activated carbon adsorption tank 8 through a lift pump 6. The water outlet of the activated carbon adsorption tank 8 is connected to the water inlet of the filter 9. The water outlet of the filter 9 is connected to the water inlet of the resin adsorption tank 10. The water outlet of the resin adsorption tank 10 is connected to the water inlet of the brine tank 11. A stirrer 3 is arranged in the medicine preparation water tank 1. A medicine preparation makeup water pipe 4 and a brine circulation pipe 7 are arranged on the top of the medicine preparation water tank 1. A ball valve is arranged on the medicine preparation makeup water pipe 4. A brine circulation port is opened on the brine tank 11. The water inlet of the brine circulation pump 27 is connected to the brine circulation port of the brine tank 11. The water outlet of the brine circulation pump 27 is connected to the brine circulation pipe 7 of the medicine preparation water tank 1.

[0021] Liquid level sensors and conductivity meters are arranged in both the medicine preparation water tank 1 and the brine tank 11. The effective volume of the medicine preparation water tank 1 is 5 - 10 m 3 。

[0022] The feeding machine 2 includes a bin and a discharger. The upper part of the bin is cylindrical, and the lower part of the bin is inverted conical. A discharger is arranged at the bottom of the bin. An outlet pipe is arranged at the bottom of the discharger and extends into the medicine preparation water tank 1. A cover plate is arranged on the top of the bin, and a feeding port is opened on the cover plate. The feeding port of the feeding machine 2 is connected to a feeding machine. An ultrasonic ranging instrument is also arranged in the bin. The effective volume of the bin is 1 - 2 m 3 。

[0023] Sodium sulfate is loaded into the bin of the feeding machine 2 through a feeding machine. The sodium sulfate comes from sodium sulfate produced by the resource utilization of coking wastewater or industrial-grade sodium sulfate. The storage amount of sodium sulfate in the bin is monitored by the ultrasonic ranging instrument in the bin. When the height of the stored sodium sulfate in the bin reaches the set height, the feeding is stopped.

[0024] A stair platform 5 is arranged on the side of the medicine preparation water tank 1, and the stair platform 5 is at the same height as the medicine preparation water tank 1.

[0025] The discharge device can be opened to add sodium sulfate into the chemical dosing water tank 1 to prepare brine, and then the mixer 3 is started to stir the brine in the chemical dosing water tank 1. The conductivity meter of the chemical dosing water tank 1 monitors the sodium sulfate concentration in the chemical dosing water tank 1, so as to adjust the dosing amount of sodium sulfate in the chemical dosing water tank 1 to maintain the sodium sulfate concentration in the chemical dosing water tank 1. The chemical dosing make-up water pipe 4 is connected to the reverse osmosis product water or demineralized water of the coking wastewater treatment system. A ball valve is provided on the chemical dosing make-up water pipe 4. The liquid level sensor of the chemical dosing water tank 1 monitors the liquid level of the chemical dosing water tank 1. When the liquid level of the chemical dosing water tank 1 is lower than the set liquid level of the chemical dosing water tank 1, the ball valve of the chemical dosing make-up water pipe 4 is opened to replenish water into the chemical dosing water tank 1; until the liquid level of the chemical dosing water tank 1 reaches the set liquid level of the chemical dosing water tank 1, the ball valve of the chemical dosing make-up water pipe 4 is closed.

[0026] As an implementable mode, the sodium sulfate concentration in the chemical dosing water tank 1 is maintained at 8-10%.

[0027] The activated carbon adsorption tank 8 is filled with granular activated carbon. The granular activated carbon uses coconut shell activated carbon. The hydraulic retention time of the activated carbon adsorption tank 8 is 1-2 hours.

[0028] The filter 9 can adopt a PP filter element with a filtration accuracy of 5μm.

[0029] The resin adsorption tank 10 is filled with softening resin. The softening resin uses sodium-type ion exchange resin. The hydraulic retention time of the resin adsorption tank 10 is 1-2 hours.

[0030] The hydraulic retention time of the brine tank 11 is 1-2 hours, and the flow rate of the brine circulation pump 27 is the same as that of the lift pump 6;

[0031] It also includes a membrane stack 14. The membrane stack 14 includes electrode plates, an electrode liquid chamber, an acid chamber, a base chamber, and a feed liquid chamber. The electrode plates are connected to the power supply 15 through cables; the water inlet of the acid chamber is communicated with the water outlet of the acid liquid tank 18 through the acid liquid circulation pump 19, and the water outlet of the acid chamber is connected to the water inlet of the acid liquid tank 18 through the acid liquid return pipe 24; the water inlet of the base chamber is communicated with the water outlet of the base liquid tank 20 through the base liquid circulation pump 21, and the water outlet of the base chamber is connected to the water inlet of the base liquid tank 20 through the base liquid return pipe 25; the water inlet of the electrode liquid chamber is connected to the water outlet of the electrode liquid tank 16 through the electrode liquid circulation pump 17, and the water outlet of the electrode liquid chamber is connected to the water inlet of the electrode liquid tank 16 through the electrode liquid return pipe 26; the water inlet of the feed liquid chamber is connected to the water outlet of the brine tank 11 through the brine return pump 12, and the water outlet of the feed liquid chamber is connected to the water inlet of the brine tank 11 through the brine return pipe 13.

[0032] The brine tank 11 returns the brine to the medicine preparation tank 1 through the brine circulation pump 27 and the brine circulation pipe 7. The conductivity meter of the brine tank 11 monitors the brine concentration in the brine tank 11. When the brine concentration in the brine tank 11 is lower than the set brine concentration of the brine tank 11, the dosing amount of the feeder 2 is increased. The liquid level sensor of the brine tank 11 monitors the brine level in the brine tank 11. When the brine level in the brine tank 11 is higher than the set brine level of the brine tank 11, the brine circulation pump 27 and the brine return pump 12 are turned on; when the brine level in the brine tank 11 drops to the set brine level, the brine circulation pump 27 and the brine return pump 12 are turned off.

[0033] A lye makeup water pipe 22 is also provided on the lye tank 20. A ball valve is provided on the lye makeup water pipe 22, and water can be replenished into the lye tank 20 through the lye makeup water pipe 22 to maintain the lye concentration in the lye tank 20; an acid makeup water pipe 23 is also provided on the acid tank 18. A ball valve is provided on the acid makeup water pipe 23, and water can be replenished into the acid tank 18 through the acid makeup water pipe 23 to maintain the acid concentration in the acid tank 18.

[0034] Level sensors and conductivity meters are provided in both the acid tank 18 and the lye tank 20.

[0035] As an implementable mode, the acid makeup water pipe 23 is connected to the reverse osmosis product water of the coking wastewater treatment system. The acid tanks 18 are provided in two groups. The water inlet of each group of acid tanks 18 is connected to the water outlet of the acid chamber, and the water outlet of each group of acid tanks 18 is connected to the water inlet of the acid chamber through the acid circulation pump 19. The conductivity meter of the acid tank 18 monitors the acid concentration in the acid tank 18, and the acid concentration is maintained at 5-8%. The two groups of acid tanks 18 operate alternately. When one group of acid tanks 18 is operating, the other group of acid tanks 18 serves as an acid storage tank. When the acid concentration in one group of acid tanks 18 reaches the set acid concentration value, it is switched to the other group of acid tanks 18. A ball valve is provided on the acid makeup water pipe 23. The liquid level sensor of the acid tank 18 monitors the acid level in the acid tank 18. When it is detected that the acid level in the acid tank 18 is lower than the set acid level, the ball valve of the acid makeup water pipe 23 is opened to replenish water into the acid tank 18; when the acid level in the acid tank 18 reaches the set acid level, the ball valve of the acid makeup water pipe 23 is closed.

[0036] The lye makeup water pipe 22 is connected to the reverse osmosis product water of the coking wastewater treatment system. Two groups of lye tanks 20 are provided. The water inlet of each group of lye tanks 20 is connected to the water outlet of the lye chamber, and the water outlet of each group of lye tanks 20 is connected to the water inlet of the lye chamber through a lye circulation pump 21. The conductivity meter of the lye tank 20 monitors the lye concentration in the lye tank 20 to keep the lye concentration at 8-10%. The two groups of lye tanks 20 operate alternately. When one group of lye tanks 20 is operating, the other group of lye tanks 20 serves as a lye storage tank. When the lye concentration reaches the set lye concentration value, it is switched to the other group of lye tanks 20. A ball valve is provided on the lye makeup water pipe 22. The liquid level sensor of the lye makeup water pipe 22 monitors the lye liquid level in the lye tank 20. When it is detected that the lye liquid level in the lye tank 20 is lower than the set lye liquid level, the ball valve of the lye makeup water pipe 22 is opened to replenish water into the lye tank 20; when the lye liquid level in the lye tank 20 reaches the set lye liquid level, the ball valve of the lye makeup water pipe 22 is closed.

[0037] The electrode liquid tank 16 uses a sodium sulfate solution as the electrode liquid, and the concentration of the sodium sulfate solution is 5-10%.

[0038] The present utility model uses sodium sulfate obtained from the resource utilization of coking wastewater as a raw material and the reverse osmosis product water of the coking wastewater treatment system as a water source. Activated carbon adsorption + filtration + resin adsorption is used to pretreat the brine in the dosing tank 1. The pretreated brine is used to prepare an acid solution and an alkali solution through bipolar membrane electrodialysis (i.e., the membrane stack 14), which are used as the acid and alkali agents required for treating the biochemical effluent of coking wastewater by the Fenton method, achieving the purpose of "treating waste with waste" and effectively reducing the treatment cost of coking wastewater.

[0039] It should be noted that the embodiments described in the present utility model are only illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. An acid-base generating device for treating coking wastewater by Fenton method, comprising a dispensing water tank (1), characterized in that: The invention also comprises a feeder (2), an activated carbon adsorption tank (8), a filter (9), a resin adsorption tank (10), and a brine tank (11). The feeder (2) is arranged on the top of the pharmaceutical water tank (1). The water outlet of the pharmaceutical water tank (1) is connected to the water inlet of the activated carbon adsorption tank (8) through a lifting pump (6). The water outlet of the activated carbon adsorption tank (8) is connected to the water inlet of the filter (9). The water outlet of the filter (9) is connected to the water inlet of the resin adsorption tank (10). The water outlet of the pharmaceutical dispensing water tank (1) is connected to the water inlet of the brine tank (11), a mixer (3) is arranged in the pharmaceutical dispensing water tank (1), a pharmaceutical dispensing water supply pipe (4) and a brine circulation pipe (7) are arranged on the top of the pharmaceutical dispensing water tank (1), a ball valve is arranged on the pharmaceutical dispensing water supply pipe (4), a brine circulation port is opened on the brine tank (11), a water inlet of a brine circulation pump (27) is connected to the brine circulation port of the brine tank (11), and a water outlet of the brine circulation pump (27) is connected to the brine circulation pipe (7) of the pharmaceutical dispensing water tank (1).

2. The acid-base generating device for treating coking wastewater by Fenton method according to claim 1, characterized in that: The membrane stack (14) also includes an electrode plate, an electrode chamber, an acid chamber, an alkali chamber, and a feed liquid chamber. The electrode plate is connected to a power source (15) via a cable; the water inlet of the acid chamber is connected to the water outlet of an acid water tank (18) via an acid circulation pump (19), and the water outlet of the acid chamber is connected to the water inlet of the acid water tank (18) via an acid reflux pipe (24); the water inlet of the alkali chamber is connected to the water outlet of the alkali water tank (20) via an alkali circulation pump (21), and the water outlet of the alkali chamber is connected to the water outlet of the alkali water tank (20). The alkali liquid chamber is connected to the water inlet of the alkali liquid tank (20) through the alkali liquid reflux pipe (25); the water inlet of the polar liquid chamber is connected to the water outlet of the polar liquid tank (16) through the polar liquid circulation pump (17), and the water outlet of the polar liquid chamber is connected to the water inlet of the polar liquid tank (16) through the polar liquid reflux pipe (26); the water inlet of the feed liquid chamber is connected to the water outlet of the brine tank (11) through the brine reflux pump (12), and the water outlet of the feed liquid chamber is connected to the water inlet of the brine tank (11) through the brine reflux pipe (13).

3. The acid-base generating device for treating coking wastewater by Fenton method according to claim 2, characterized in that: The feeder (2) comprises a silo and a discharger. The upper part of the silo is cylindrical, the lower part of the silo is inverted cone shape, the discharger is arranged at the bottom of the silo, the bottom of the discharger is arranged with a discharge pipe, the discharge pipe extends into the dispensing water tank (1), a cover plate is arranged at the top of the silo, a feed port is opened on the cover plate, the feed port of the feeder (2) is connected to the loading machine, and an ultrasonic rangefinder is also arranged in the silo.

4. The acid-base generating device for treating coking wastewater by Fenton method according to claim 3, characterized in that: A staircase platform (5) is arranged on the side of the pharmaceutical dispensing water tank (1), and the staircase platform (5) is at the same height as the pharmaceutical dispensing water tank (1).

5. The acid-base generating device for treating coking wastewater by Fenton method according to claim 4, characterized in that: The pharmaceutical dispensing water tank (1), the acid water tank (18), the alkali water tank (20), and the salt water tank (11) are all provided with liquid level sensors and conductivity meters.

6. The acid-base generating device for treating coking wastewater by Fenton method according to claim 5, characterized in that: The alkaline liquid water tank (20) is also provided with an alkaline liquid water supply pipe (22), and the acid liquid water tank (18) is also provided with an acid liquid water supply pipe (23). Both the acid liquid water tank (18) and the alkaline liquid water supply pipe (22) are provided with ball valves.

7. The acid-base generating device for treating coking wastewater by Fenton method according to claim 6, characterized in that: The acid water tank (18) and the alkali water tank (20) are arranged in multiple groups, the water inlet of each group of acid water tanks (18) is connected to the water outlet of the acid chamber, and the water outlet of each group of acid water tanks (18) is connected to the water inlet of the acid chamber via an acid circulation pump (19); the water inlet of each group of alkali water tanks (20) is connected to the water outlet of the alkali chamber, and the water outlet of each group of alkali water tanks (20) is connected to the water inlet of the alkali chamber via an alkali circulation pump (21).

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