CN111675308B - Wastewater ozone dechlorination system and process - Google Patents
Wastewater ozone dechlorination system and process Download PDFInfo
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- CN111675308B CN111675308B CN202010560888.XA CN202010560888A CN111675308B CN 111675308 B CN111675308 B CN 111675308B CN 202010560888 A CN202010560888 A CN 202010560888A CN 111675308 B CN111675308 B CN 111675308B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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Abstract
The invention relates to the field of wastewater dechlorination, and particularly provides a wastewater ozone dechlorination system and a wastewater ozone dechlorination process. The wastewater ozone dechlorination system comprises a dechlorination device, an ozone generating device is installed at the bottom of the dechlorination device, a spray head is installed on the upper portion of the dechlorination device and is connected with a feed pipeline, a wastewater heater is installed on the feed pipeline, a chlorine gas discharge pipeline is arranged at the top of the dechlorination device, and the chlorine gas discharge pipeline is a negative pressure pipeline. The wastewater ozone dechlorination process is carried out in the wastewater ozone dechlorination system. The utilization rate of ozone is improved; according to the chemical equilibrium principle, the dissolution of chlorine in the wastewater is reduced. Avoid using large-scale waste water agitating unit, reduce the chloride ion treatment cost.
Description
Technical Field
The invention relates to the field of wastewater dechlorination, and particularly provides a wastewater ozone dechlorination system and a wastewater ozone dechlorination process.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The high-salinity wastewater is often high-salinity wastewater in wastewater of power plants, steel plants and the like, so that the wastewater brings serious harm to equipment and production of the power plants, the steel plants and the like, the corrosion is serious, the high-salinity wastewater is high in pollution and cannot be discharged randomly, and therefore the treatment of the high-salinity wastewater in the field is very concerned.
The concentration of chloride ions in high-salinity wastewater of a general enterprise is 1000-50000mg/l, and the content of the chloride ions is high, so that the removal of the chloride ions is one of the most important problems in the treatment of the high-salinity wastewater, and the most effective removal method for the chloride ions in the prior art is to forcibly oxidize the chloride ions into chlorine and reuse the chlorine.
Ozone has strong oxidizability, the oxidation-reduction potential of the ozone reaches 2.07eV, and most organic matters can be oxidized and degraded; therefore, the ozone oxidation technology is widely applied to sewage treatment in the prior art, and meanwhile, the technology has the characteristics of high reaction rate, almost no chemical substance residue and secondary pollution and the like. The method for treating wastewater by using ozone in the prior art specifically comprises a scheme of treating wastewater by using ozone and other catalysts in a synergistic oxidation manner, however, the scheme does not completely utilize ozone, and other catalysts are also needed to be used as packing layers, so that the utilization rate of ozone is low; in the prior art, a scheme for cooperatively treating wastewater by ozone and ultrasonic waves is required, and the scheme has higher cost due to the addition of an ultrasonic device.
Therefore, the inventor summarizes the current situation of ozone wastewater treatment: 1. the traditional ozone treatment technology mostly adopts micropore or jet aeration, normal-pressure gas-liquid multiphase reaction occurs in the system, the reaction efficiency is low, and the ozone utilization rate is not high; 2. in order to improve the reaction efficiency and the utilization rate of ozone, numerous scholars at home and abroad explore a plurality of strengthening measures, such as improving a gas-liquid two-phase contact device and the internal structure thereof, adding a propagation promoter, adding a magnetic field, ultrasonic waves, a supergravity field and the like, so that the cost is higher, the measures improve the mass transfer and utilization efficiency of ozone to a certain extent, but the improvement effect is still unsatisfactory; 3. because chlorine is very easy to dissolve in water, new hazards such as chloride ions, hypochlorous acid, chloride and the like are easily formed again; 4. in the prior art, a plurality of batches of wastewater are generally treated in a centralized manner, chloride ions are distributed unevenly, and the wastewater is stirred before treatment, but industrial large-scale stirring equipment usually occupies a large area, and has large power consumption and high cost.
Disclosure of Invention
The utility model provides a problem that among the prior art ozone low-usage, chlorine easily dissolve in the waste water, will many batches of waste water centralized processing among the prior art, use large-scale industry agitating unit stirring, area is big, and chloride ion treatment cost is high, the first aspect of this disclosure provides a waste water ozone dechlorination system, waste water ozone dechlorination system is including the dechlorination device, ozone generating device is installed to the dechlorination device bottom, and the shower nozzle is installed on dechlorination device upper portion, and the shower nozzle links to each other with the charge-in pipeline, installation waste water heater on the charge-in pipeline, dechlorination device top has chlorine discharge pipeline, and chlorine discharge pipeline is the negative pressure pipeline.
In order to solve the above problems, in a second aspect of the present disclosure, there is provided a wastewater ozone dechlorination process performed in the above wastewater ozone dechlorination system, in which wastewater enters a dechlorination device from a nozzle through a wastewater heater from a feed pipe, oxygen is prepared into ozone through an ozone generator, the ozone enters an aeration disc and reversely contacts with the wastewater to oxidize chloride ions in the wastewater into chlorine, and the chlorine is pumped from the dechlorination device to a chlorine discharge pipe by a vacuum pump.
One of the above technical solutions has the following advantages or beneficial effects:
1) utilize the strong oxidizing property of ozone to oxidize the chloride ion in with the waste water for chlorine and discharge, waste water and ozone reverse contact, mass transfer efficiency is higher, at this in-process, utilizes aeration equipment to prepare into the nanometer bubble with ozone, increase area of contact, and waste water is heated before getting into the dechlorination device, reduces the solubility of ozone in waste water, improves ozone and chloride ion reaction efficiency. Waste water passes through the shower nozzle and gets into the dechlorination device, through the shower nozzle with the chloride ion mixing, avoided the uneven problem of chloride ion distribution in waste water, avoided using large-scale industrial mixing device to carry out the mixing simultaneously.
2) This disclosure utilizes the shower nozzle to atomize the waste water and diffuse according to the chemical equilibrium principle, contains a large amount of chloride ions in the waste water, avoids chlorine to dissolve in waste water again, and the vacuum pump provides the negative pressure for whole chlorine removal device, accelerates chlorine discharge, promotes chlorine and generates, consequently, this disclosure is from restraining Cl2+O3＝O2+Cl2The solubility of chlorine in the wastewater is reduced in two aspects of the reverse reaction and the forward reaction promotion.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and, together with the description, serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a wastewater ozone dechlorination system described in example 1.
Wherein: 1. a chlorine removal device; 11 a spray head; 12, an aeration disc; 2. an ozone generator; 3. a waste water heater; 4. a liquid level regulating drain valve; 41. a recovery water tank; 5. a sampling valve; 6. a waste water pump; 7. a vacuum pump.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The wastewater described in the disclosure is wastewater containing chloride ions, mainly comes from power plants and steel plants, and can be the wastewater described in the disclosure as long as the wastewater contains chloride ions in principle, and the wastewater treated in the embodiment is high-salinity wastewater with the concentration of chloride ions of 1000-50000 mg/l.
The ozone generator disclosed by the disclosure is a device for preparing ozone, the ozone is easy to decompose and cannot be stored, and the ozone generator needs to be prepared for use at present.
The dechlorination device is a modification of a conventional vessel-shaped reaction kettle in the prior art.
The aeration disc is a conventional aeration disc in the prior art and is generally formed by connecting an aerator, a regulator, a connecting piece, an air distribution pipeline, a tee joint, a four-way joint, an elbow and other pipe fittings.
As described in the background art, in the prior art, because a plurality of batches of chlorine-containing wastewater are usually mixed for treatment, a large stirring device is often required to be started for treatment, the cost is high, and the occupied area of the stirring device is large; the ozone is decomposed quickly and is easy to dissolve in water, and the utilization rate of the ozone in the prior art is low; the chlorine prepared in the prior art is easy to react again to generate new pollutants such as chloride ions, chloride, hypochlorous acid and the like.
In one or some embodiments of the present disclosure, a wastewater ozone dechlorination system is provided, which includes a dechlorination device, an ozone generating device is installed at the bottom of the dechlorination device, a spray head is installed at the upper part of the dechlorination device, the spray head is connected with a feed pipe, and a wastewater heater is installed on the feed pipe. The top of the chlorine removal device is provided with a chlorine gas discharge pipeline which is a negative pressure pipeline.
In one or more specific embodiments of the present disclosure, the ozone generating device comprises an aeration disc and an ozone generator, the aeration disc is located at the bottom of the chlorine removal device, and the ozone generator is located outside the chlorine removal device and is connected with the aeration disc through a pipeline.
Furthermore, a thermometer is arranged on the wastewater heater to measure the temperature of the wastewater.
Furthermore, a flowmeter and a pressure gauge are arranged on a pipeline between the ozone generator and the aeration disc, so that the ozone entering the dechlorination device can be conveniently detected.
Furthermore, the aeration disc is a micro-nano aeration generating device.
Further, the aeration discs are arranged in an upper layer and a lower layer.
Furthermore, the aeration discs are arranged in a staggered manner in an upper layer and a lower layer.
In one or more specific embodiments of the present disclosure, a liquid level adjusting device is disposed between the spray head and the aeration plate, the liquid level adjusting device is used for adjusting the liquid level of the wastewater, when the liquid level of the wastewater is too high, the liquid level adjusting device is turned on to discharge the wastewater, and when the liquid level is low, the liquid level adjusting device is turned off.
Furthermore, the liquid level adjusting device comprises a plurality of liquid level adjusting discharge valves arranged on the wall of the tank body of the chlorine removal device, each liquid level adjusting valve corresponds to one liquid level adjusting pipeline, and all the liquid level adjusting pipelines are connected with the recovery water tank.
Furthermore, the waste water in the recovery water tank enters the chlorine removal device again through the spray head.
Further, each liquid level adjusting discharge valve corresponds to a sampling valve, and the sampling valve is used for sampling from the chlorine removal device to detect the concentration of the wastewater.
In one or some embodiments of the present disclosure, the chlorine gas discharge pipe is provided with a vacuum pump.
Furthermore, a chlorine detector is arranged on the chlorine discharge pipeline to detect the concentration of chlorine, so that the subsequent collection and utilization of chlorine are facilitated.
In one or more embodiments of the present disclosure, a wastewater ozone dechlorination process is provided, the wastewater ozone dechlorination process is performed in the above wastewater ozone dechlorination system, wastewater enters a dechlorination device from a spray head through a wastewater heater from a feed pipeline, oxygen is prepared into ozone through an ozone generator, the ozone enters an aeration disc and is in reverse contact with the wastewater to oxidize chloride ions in the wastewater into chlorine, and the chlorine is pumped from the dechlorination device to a chlorine discharge pipeline through a vacuum pump.
Further, the waste water heater heats the waste water to 60 ℃.
This openly utilizes the strong oxidizing property of ozone to oxidize the chloride ion in with the waste water for chlorine and discharge, and waste water and ozone reverse contact, mass transfer efficiency are higher, and at this in-process, utilize aeration equipment to prepare into the nanometer bubble with ozone, increase area of contact, waste water is heated before getting into the dechlorination device, reduces the solubility of ozone in waste water, improves ozone and chloride ion reaction efficiency.
This is disclosed according to the chemical equilibrium principle, utilizes the shower nozzle to atomize the waste water and spreads, contains a large amount of chloride ions in the waste water, avoids chlorine to dissolve in waste water again, and the vacuum pump provides the negative pressure for whole chlorine removal device, accelerates chlorine discharge, promotes chlorine and generates.
Example 1
As shown in fig. 1, the present embodiment provides a wastewater ozone dechlorination system, which includes a dechlorination apparatus 1, an aeration disc 12 is installed at the bottom of the dechlorination apparatus 1, the aeration disc 12 is connected to an ozone generator 2, the two are used for providing ozone required by the reaction, the aeration disc 12 is a micro-nano scale aeration generating apparatus, so that ozone nano bubbles can fully react with chloride ions in wastewater. The ozone nano bubbles form reverse contact with the wastewater in water, and the ozone and chloride ions can be in full contact reaction to generate chlorine gas to be discharged. The aeration discs 12 are arranged in an upper layer and a lower layer, so that the contact area is increased.
The upper part of the chlorine removal device 1 is provided with a spray head 11, wastewater enters the chlorine removal device 1 through the spray head 11, and the spray head 11 sprays the wastewater, so that the concentration of chloride ions in the wastewater is uniform, and the wastewater containing the chloride ions is atomized and spreads above the liquid level of the chlorine removal device 1.
There is chlorine discharge pipe at dechlorination device 1 top, and ozone overflows with chlorine ion reaction back chlorine, discharges from the chlorine discharge pipe at dechlorination device 1 top, recycle, because dechlorination device 1 upper portion installs the shower nozzle, and the waste water atomization that will contain the chloride ion is diffused, because chemical balance principle, the existence of a large amount of chloride ions has avoided chlorine to react with water again and has generated chloride ion in the waste water, or dissolves in water and forms new pollutants such as chloride, hypochlorous acid. The chlorine gas discharge pipeline is provided with a vacuum pump 7 for pumping out chlorine gas, and the vacuum pump 7 provides micro negative pressure for the chlorine removal device, so that the dissolution of the chlorine gas in the wastewater is further reduced.
A liquid level adjusting device is arranged between the spray head 11 and the aeration disc 12, the liquid level adjusting device comprises a plurality of liquid level adjusting discharge valves 4 arranged on the wall of the tank body of the chlorine removal device 1, each liquid level adjusting valve 4 corresponds to one liquid level adjusting pipeline, and all the liquid level adjusting pipelines are connected with a recovery water tank 41. The liquid level adjusting device can adjust the waste water liquid level in the dechlorination device 1, adjusts reasonable liquid level according to the difference of chloride ion concentration, and chloride ion concentration is higher in the waste water promptly, then corresponds the liquid level and is lower, otherwise then the liquid level is higher. The contact time of the chlorine ions and the ozone is adjusted by controlling the liquid level. When the liquid level is too high, the liquid level regulating valve is opened, the wastewater enters the recovery water tank along the liquid level regulating pipeline, and the discharged wastewater enters the chlorine removal device 1 again through the spray head 11.
Each level regulating drain valve 4 corresponds to a sampling valve 5, the sampling valve 5 is used for sampling from the chlorine removal device 1 to detect the concentration of the wastewater, and the sampling valve 5 is usually small in size, so the level regulating drain valve 4 is not usually used in place of the sampling valve 5.
The shower nozzle 11 links to each other with charge-in pipeline, has waste water heater 3 on the charge-in pipeline, waste water heater 3 is used for heating waste water, heats waste water, avoids ozone to dissolve in water or decompose production oxygen and free radical in the dissolving process, leads to ozone utilization ratio relatively poor.
Example 2
The embodiment provides a wastewater ozone dechlorination process, which is carried out in the wastewater ozone dechlorination system described in embodiment 1, wastewater enters a dechlorination device 1 from a spray head 11 through a wastewater heater 3 from a feed pipeline, oxygen is prepared into ozone through an ozone generator 2, the ozone enters an aeration disc 12 and is in reverse contact with the wastewater to oxidize chloride ions in the wastewater into chlorine, and the chlorine is pumped to a chlorine discharge pipeline from the dechlorination device 1 through a vacuum pump 7.
The waste water is atomized by the spray head 11 and spreads over the upper part of the chlorine removal device 1, and the generated chlorine can be prevented from being dissolved in the waste water again because the waste water contains more chloride ions. The spray head 11 makes the chloride ions evenly distributed in the waste water.
When the concentration of chloride ions in the wastewater is too high, the liquid level adjusting discharge valve 4 is opened, so that the wastewater enters the recovery water tank 41 along the liquid level adjusting pipeline until reaching a reasonable liquid level.
The solubility of ozone in water is 0 at 60 ℃, the chlorine is 0.3295/100g of water at 60 ℃, the wastewater is heated to above 60 ℃, the wastewater is controlled below the boiling point, the wastewater is heated, so that the ozone is not dissolved in the water or decomposed in the dissolving process to generate oxygen and free radicals, and the utilization rate of the ozone is reduced. The solubility of chlorine in water at 20 ℃ reaches 0.7293g/100g, and the solubility of chlorine in water is greatly reduced through temperature control. The ozone can be fully utilized and reacted by heating the waste water, and chlorine can be fully discharged to improve the dechlorination efficiency.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (8)
1. The wastewater ozone dechlorination system is characterized by comprising a dechlorination device, wherein an ozone generating device is arranged at the bottom of the dechlorination device, a spray head is arranged at the upper part of the dechlorination device and is connected with a feed pipeline, a wastewater heater is arranged on the feed pipeline, a chlorine gas discharge pipeline is arranged at the top of the dechlorination device, and the chlorine gas discharge pipeline is a negative pressure pipeline;
a liquid level adjusting device is arranged between the spray head and the aeration disc;
the liquid level adjusting device comprises a plurality of liquid level adjusting discharge valves arranged along the wall of the tank body of the chlorine removal device, each liquid level adjusting valve corresponds to one liquid level adjusting pipeline, and all the liquid level adjusting pipelines are connected with the recovery water tank;
the liquid level adjusting device can adjust the waste water liquid level in the dechlorination device, adjusts reasonable liquid level according to the difference of chloride ion concentration, and chloride ion concentration is higher in the waste water promptly, then corresponds the liquid level and lower, otherwise then the liquid level is higher.
2. The wastewater ozone dechlorination system of claim 1 wherein the ozone generating device comprises an aeration tray and an ozone generator, the aeration tray is located at the bottom of the dechlorination device, and the ozone generator is located outside the dechlorination device and is connected with the aeration tray through a pipeline.
3. The wastewater ozone dechlorination system of claim 2 wherein the aeration discs are arranged in an upper and lower double layer.
4. The wastewater ozone dechlorination system of claim 1 wherein each level adjustment drain valve corresponds to a sampling valve.
5. The wastewater ozone dechlorination system of claim 1, wherein a vacuum pump is installed on the chlorine gas discharge pipeline.
6. The wastewater ozone dechlorination system of claim 1 wherein the wastewater in the recovery pond is re-introduced into the dechlorination device through the spray head.
7. A wastewater ozone dechlorination process, which is characterized in that the wastewater ozone dechlorination process is carried out in the wastewater ozone dechlorination system of any one of claims 1 to 6, wastewater enters a dechlorination device from a spray head through a wastewater heater from a feed pipeline, oxygen is prepared into ozone through an ozone generator, the ozone enters an aeration disc and is in reverse contact with the wastewater to oxidize chloride ions in the wastewater into chlorine, and the chlorine is pumped from the dechlorination device to a chlorine discharge pipeline through a vacuum pump;
the liquid level adjusting device can adjust the waste water liquid level in the dechlorination device, adjusts reasonable liquid level according to the difference of chloride ion concentration, and chloride ion concentration is higher in the waste water promptly, then corresponds the liquid level and lower, otherwise then the liquid level is higher.
8. The wastewater ozone dechlorination process of claim 7 wherein the wastewater heater heats the wastewater to 60 ℃.
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| CN113480079A (en) * | 2021-08-20 | 2021-10-08 | 无锡中天固废处置有限公司 | Treatment process of wastewater containing chlorine and organic matters |
| CN114772631A (en) * | 2022-04-20 | 2022-07-22 | 柳州华锡有色设计研究院有限责任公司 | Method for deeply removing residual chlorine in ITO powder slurry by using ozone |
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| CN107140727A (en) * | 2017-04-11 | 2017-09-08 | 四川大学 | A kind of method that chlorine-contained wastewater purification is discharged in Zinc Hydrometallurgy Process |
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| KR20110067182A (en) * | 2009-12-14 | 2011-06-22 | 손덕순 | Treatment method and apparatus of chlorine ion and hardness in water |
| CN105617863A (en) * | 2015-12-28 | 2016-06-01 | 安徽理工大学 | Method for desulfurized slurry dechlorination |
| CN108502985A (en) * | 2018-06-01 | 2018-09-07 | 山东深信节能环保科技有限公司 | A kind of the combined electrical chemical system and processing method of scale removal dechlorination |
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Denomination of invention: A system and process for removing chlorine from wastewater by ozone Effective date of registration: 20221228 Granted publication date: 20210824 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan Changqing branch Pledgor: SHANDONG GUOSHUN CONSTRUCTION GROUP Co.,Ltd. Registration number: Y2022980029384 |