CN215365313U - Device for treating high-concentration COD wastewater - Google Patents
Device for treating high-concentration COD wastewater Download PDFInfo
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- CN215365313U CN215365313U CN202122002578.9U CN202122002578U CN215365313U CN 215365313 U CN215365313 U CN 215365313U CN 202122002578 U CN202122002578 U CN 202122002578U CN 215365313 U CN215365313 U CN 215365313U
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Abstract
The utility model discloses a device for treating high-concentration COD (chemical oxygen demand) wastewater, which comprises a filtering device, wherein a discharge port of the filtering device is sequentially connected with a Fenton reaction device, a regulating device, a treatment device, an evaporation device and a temporary storage device through pipelines, the temporary storage device is provided with a detection mechanism for detecting the COD of the wastewater in the temporary storage device, and a wastewater circulating mechanism is also arranged between the temporary storage device and the Fenton reaction device; the waste water circulation mechanism comprises a circulating pump, the inlet and outlet ends of the circulating pump are respectively connected with the enamel stirring kettle and the temporary storage tank through connecting pipes, and a fourth valve is installed on the connecting pipes. The method measures COD according to a potassium dichromate digestion method, can directly discharge when the COD reaches a drainage index, returns all the wastewater in the temporary wastewater storage tank to the Fenton reactor through a circulating pump if the COD exceeds the drainage index, and adds a certain amount of Fenton reagent according to the COD value for re-reaction.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a device for treating high-concentration COD wastewater.
Background
The Fenton reagent can effectively oxidize and remove refractory organic matters which cannot be removed by the traditional wastewater treatment technology, and the essence is that H2O2 generates hydroxyl free OH with high reaction activity under the catalytic action of Fe2+, and the hydroxyl free OH can be reacted with most organic matters to degrade the organic matters. With the progress of research, ultraviolet light (UV), oxalate (C2O42-) and the like are introduced into the Fenton reagent, so that the oxidizing capability of the Fenton reagent is greatly enhanced. In a broad sense, the fenton method is a technique for treating an organic substance by generating hydroxyl radicals OH "from H2O2 by using a catalyst, light irradiation, or an electrochemical action. In recent years, more and more researchers have combined fenton's reagent with other treatment methods, such as biological treatment, ultrasonic treatment, coagulation, precipitation, activated carbon, and the like. From the development history, the Fenton method is developed along three routes, namely photochemical, electrochemical and other methods. Although fenton oxidation effect preferred, nevertheless form complicacy changeable because of waste water COD, its oxidation effect often can't reach the expectation, even constantly increase the fenton reagent quantity, also hardly realize waste water COD is up to standard, and common treatment scheme is: the COD of the effluent is controlled to reach the standard by adding a biochemical system or a resin bed at the downstream of the evaporator, but the process line is complicated due to uncontrollable factors, and the high-COD wastewater with complicated pollutant composition is difficult to effectively treat by a conventional biochemical method.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a device for treating high-concentration COD wastewater.
The purpose of the utility model is realized by the following technical scheme:
an apparatus for treating high concentration COD wastewater, comprising:
the device comprises a filtering device, wherein a discharge port of the filtering device is sequentially connected with a Fenton reaction device, a regulating device, a treatment device, an evaporation device and a temporary storage device through pipelines, the temporary storage device is provided with a detection mechanism for detecting the COD (chemical oxygen demand) of the wastewater in the temporary storage device, and a wastewater circulating mechanism is also arranged between the temporary storage device and the Fenton reaction device; waste water circulation mechanism includes the circulating pump, the income delivery end of circulating pump is passed through the connecting pipe and is connected fenton response equipment and temporary storage equipment respectively, install the fourth valve on the connecting pipe.
Further, the filtering device adopts a bag filter; the Fenton reaction equipment adopts an enamel stirring kettle.
Further, the adjusting device adopts an acid-base adjusting kettle; the treatment equipment adopts a plate-and-frame filter press; the evaporation equipment adopts a single-effect evaporator or a double-effect evaporator.
Further, the temporary storage equipment is a temporary storage tank; the detection mechanism comprises a COD detector arranged outside.
Further, be provided with the sample connection on the sealed lid of jar upper end of keeping in, the sample connection inlays and is equipped with the leak protection stopper.
Furthermore, a water outlet is formed in the side wall of the temporary storage tank, and a first valve is installed at the water outlet.
Further, the temporary storage tank lateral wall is connected with the sampling tube, the second valve is installed to the extension end of sampling tube, the output of second valve is corresponding with the reagent pipe on the COD detector.
Furthermore, a return pipe is communicated with the sampling pipe, the extending end of the return pipe is communicated with the temporary storage tank, and a return pump and a third valve are arranged on the return pipe.
The utility model has the beneficial effects that:
the device for treating high-concentration COD wastewater disclosed by the utility model has the advantages that through the arrangement of the wastewater circulating mechanism and the detection mechanism, when the COD of the wastewater reaches the drainage index, the wastewater can be directly discharged, if the COD exceeds the standard, all wastewater in the wastewater temporary storage tank returns to the Fenton reactor through the circulating pump, and a quantitative Fenton reagent is added according to the COD value for re-reaction, so that the process route is simpler, and the COD of the wastewater can have a better control effect; the device adopts the mode of fenton coupling evaporation to degrade COD in the waste water, makes sewage COD discharge up to standard.
Drawings
FIG. 1 is a flow chart of wastewater treatment according to the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
In the first embodiment, as shown in fig. 1, a device for treating high concentration COD wastewater includes a filtering apparatus, a discharge port of the filtering apparatus is connected with a fenton reaction apparatus, an adjusting apparatus, a treatment apparatus, an evaporation apparatus and a temporary storage apparatus in sequence through a pipeline, a detection mechanism for detecting wastewater COD in the temporary storage apparatus is arranged on the temporary storage apparatus, and a wastewater circulation mechanism is further arranged between the temporary storage apparatus and the fenton reaction apparatus.
The embodiment is further configured as follows: the filtering equipment adopts a bag filter; the Fenton reaction equipment adopts an enamel stirring kettle. In this embodiment, the output end of the bag filter is connected with the feed end of the enamel stirring kettle through a first pipeline, a first delivery pump is installed in the middle of the first pipeline, and the first delivery pump is controlled by a controller.
The embodiment is further configured as follows: the adjusting device adopts an acid-base adjusting kettle; the treatment equipment adopts a plate-and-frame filter press; the evaporation equipment adopts a single-effect evaporator or a double-effect evaporator. In the embodiment, the output end of the enamel stirring kettle is connected with the feed end of the acid-base adjusting kettle through a second pipeline, and a second delivery pump is arranged in the middle of the second pipeline; the output end of the acid-base adjusting kettle is connected with the feed end of the plate-and-frame filter press through a third pipeline, and a third delivery pump is arranged in the middle of the third pipeline; the output end of the plate-and-frame filter press is connected with the feed end of the single-effect evaporator through a fourth pipeline, a fourth conveying pump is installed in the middle of the fourth pipeline, and the second conveying pump, the third conveying pump and the fourth conveying pump are controlled through a controller.
The embodiment is further configured as follows: the temporary storage equipment is a temporary storage tank; the detection mechanism comprises a COD detector arranged outside. In this embodiment, the COD detector is of the type: the EFC-3D printing type COD rapid measuring instrument is developed, improved and manufactured according to the latest national standard of Rapid digestion spectrophotometry (HJ924-2017), and is suitable for various detection standards at home and abroad; the method has the characteristics of rapidness, accuracy, intuition, direct concentration reading, microcomputer control technology and the like, and is widely suitable for measuring the Chemical Oxygen Demand (COD) in surface water, underground water, domestic sewage and industrial wastewater; the application of the cold light source technology ensures that the service life of the light source lamp is as long as 10 ten thousand hours; the instrument has the advantages of high detection precision, wide detection range and powerful functions.
The embodiment is further configured as follows: the sealing cover of the upper end of the temporary storage tank is provided with a sampling port, and the sampling port is embedded with a leakage-proof plug. Through the setting of leak protection stopper for waste water can not outwards reveal from the gap of sample connection.
The embodiment is further configured as follows: the side wall of the temporary storage tank is provided with a water outlet, and a first valve is installed at the water outlet. The first valve is controlled by the controller, the flow of the first valve is adjusted to a corresponding position, then the first valve is opened manually for sampling, and then the first valve is sent to the COD detector for detection.
The embodiment is further configured as follows: the waste water circulation mechanism comprises a circulating pump, the inlet and outlet ends of the circulating pump are respectively connected with the enamel stirring kettle and the temporary storage tank through connecting pipes, a fourth valve is installed on the connecting pipes, and a sampling pump is installed on the sampling pipe. Circulating pump, fourth valve and sampling pump are controlled through the controller, through the setting of circulating pump and connecting pipe, detect out waste water and are not conform to the discharge standard when the COD detector, then open the fourth valve and pass through the circulating pump and will keep in the jar waste water of returning and carry out retreatment in the enamel stirred tank.
The device for treating high-concentration COD wastewater comprises filtering equipment, wherein a discharge port of the filtering equipment is sequentially connected with Fenton reaction equipment, adjusting equipment, treating equipment, evaporating equipment and temporary storage equipment through pipelines, a detection mechanism for detecting COD in wastewater in the temporary storage equipment is arranged on the temporary storage equipment, and a wastewater circulating mechanism is arranged between the temporary storage equipment and the Fenton reaction equipment; the device is also provided with a controller.
The embodiment is further configured as follows: the filtering equipment adopts a bag filter; the Fenton reaction equipment adopts an enamel stirring kettle. In this embodiment, the output end of the bag filter is connected with the feed end of the enamel stirring kettle through a first pipeline, a first delivery pump is installed in the middle of the first pipeline, and the first delivery pump is controlled by a controller.
The embodiment is further configured as follows: the adjusting device adopts an acid-base adjusting kettle; the treatment equipment adopts a plate-and-frame filter press; the evaporation equipment adopts a single-effect evaporator or a double-effect evaporator. In the embodiment, the output end of the enamel stirring kettle is connected with the feed end of the acid-base adjusting kettle through a second pipeline, and a second delivery pump is arranged in the middle of the second pipeline; the output end of the acid-base adjusting kettle is connected with the feed end of the plate-and-frame filter press through a third pipeline, and a third delivery pump is arranged in the middle of the third pipeline; the output end of the plate-and-frame filter press is connected with the feed end of the single-effect evaporator through a fourth pipeline, a fourth conveying pump is installed in the middle of the fourth pipeline, and the second conveying pump, the third conveying pump and the fourth conveying pump are controlled through a controller.
The embodiment is further configured as follows: the temporary storage equipment is a temporary storage tank; the detection mechanism comprises a COD detector arranged outside. The COD detector is electrically connected with the controller. In the embodiment, the COD analyzer is a novel full-automatic on-line analyzer for measuring the Chemical Oxygen Demand (COD) of the sewage, and sealed catalytic digestion is utilized; then, carrying out colorimetric method measurement, namely adding a certain amount of oxidant containing potassium dichromate into a strong acid solution, and digesting the water sample at a constant temperature of 165 ℃ for 10 minutes under the action of a catalyst; hexavalent chromium in the potassium dichromate is reduced into trivalent chromium by organic matters in a water sample, the content of the trivalent chromium is measured at the position with the wavelength of 610mm, and then the concentration is converted into COD. The method has the characteristics of accurate measurement, low detection limit, high reliability, strong adaptability and the like.
The embodiment is further configured as follows: the sealing cover of the upper end of the temporary storage tank is provided with a sampling port, and the sampling port is embedded with a leakage-proof plug. Through the setting of leak protection stopper for waste water can not outwards reveal from the gap of sample connection.
The embodiment is further configured as follows: the utility model discloses a COD detector, including the COD detector, the tank lateral wall of keeping in is connected with the sampling tube, the second valve is installed to the extension end of sampling tube, the output of second valve is corresponding with the reagent pipe on the COD detector. The second valve is controlled by the controller, and the COD detector and the device are linked to use by the arrangement of the sampling tube without manual sampling, so that the manual work is saved.
The embodiment is further configured as follows: the sampling tube is communicated with a return pipe, the extending end of the return pipe is communicated with the temporary storage tank, and the return pipe is provided with a return pump and a third valve. The reflux pump and the third valve are controlled through control, and the reflux pump and the third valve are arranged, so that the waste water in the sampling pipe is ensured not to be accumulated for a long time, and the timeliness of waste water COD detection is ensured.
The COD detector has the use method that: adding five standard reagents into the equipment, wherein the five standard reagents comprise potassium dichromate, silver sulfate, concentrated sulfuric acid, a standard solution and a standard zero solution; the sampling pump drives a water sample to be sucked into the measuring test tube, the side wall of the measuring test tube is provided with an infrared positioner, and when the water sample reaches the scale, the sampling pump and the second valve are closed; then, mechanically or manually injecting potassium dichromate, silver sulfate and concentrated sulfuric acid into a digestion tube, heating to 175 ℃, measuring by a photometer arranged on the wall of the digestion tube after digestion and cooling for a certain time, carrying out colorimetric conversion to obtain a COD value, converting a signal into a 4-20Ma analog quantity standard signal, and transmitting the standard signal to a controller; and discharging waste liquid in the measuring tube and cleaning after the detection is finished.
The embodiment is further configured as follows: the waste water circulation mechanism comprises a circulating pump, the inlet and outlet ends of the circulating pump are respectively connected with the enamel stirring kettle and the temporary storage tank through connecting pipes, a fourth valve is installed on the connecting pipes, and a sampling pump is installed on the sampling pipe. Circulating pump, fourth valve and sampling pump are controlled through the controller, through the setting of circulating pump and connecting pipe, detect out waste water and are not conform to the discharge standard when the COD detector, then open the fourth valve and pass through the circulating pump and will keep in the jar waste water of returning and carry out retreatment in the enamel stirred tank.
A wastewater treatment method of a device for treating high-concentration COD wastewater comprises the following steps:
firstly, conveying the wastewater into a bag filter to filter solid slag and suspended matters in the wastewater, and conveying the wastewater into an enamel stirring kettle through a pipeline;
adding a Fenton reagent into the enamel stirring kettle to enable the wastewater to undergo a strong oxidation reaction, wherein the reaction is carried out at normal temperature and normal pressure for 1h, and then conveying the wastewater into an acid-base regulation kettle through a pipeline;
adding sodium hydroxide into the acid-base adjusting kettle to adjust the pH to 8, and conveying a large amount of ferric hydroxide generated at the time into a plate-and-frame filter press through a pipeline;
step four, dehydrating the wastewater through a plate-and-frame filter press, and then conveying the wastewater into evaporation equipment through a pipeline;
step five, concentrating the wastewater through evaporation equipment or separating out crystal grains from the wastewater, and then conveying the crystal grains into a temporary storage tank through a pipeline;
step six, feeding the wastewater to be detected into a reagent tube on a COD detector through a sampling tube, and then detecting through the COD detector;
seventhly, if the detection result of the COD detector is qualified, the COD of the detector reaches the drainage index, and the wastewater can be directly discharged; and if the COD drainage index exceeds the standard, returning all the wastewater in the temporary storage tank to the Fenton reactor through the circulating pump, adding a quantitative Fenton reagent according to the COD value for re-reaction, and treating again according to the steps.
Fenton oxidation principle: the essence of Fenton is that the chain reaction between ferrous ions (Fe2+) and H2O2 catalyzes the generation of hydroxyl radical OH, which has strong oxidizing power and oxidation potential second to fluorine, and is as high as 2.80V. In addition, the hydroxyl free radical has high electronegativity or electrophilicity, the electron affinity of the hydroxyl free radical reaches 569.3 kJ, and the hydroxyl free radical has strong addition reaction characteristics. Therefore, the Fenton reagent can indiscriminately oxidize most organic matters in water and is particularly suitable for the organic wastewater oxidation treatment which is difficult to biodegrade or difficult to work by common chemical oxidation.
The main reaction formula of the Fenton reaction is as follows:
[Fe(H2O)6]3++H2O→[Fe(H2O)5OH]2++H3O+；
[Fe(H2O)5OH] 2++H2O→[Fe(H2O)4(OH)2]+ H3O+；
at a pH of 3 to 7, the complex is converted into:
2[Fe(H2O)5OH]2+→[Fe(H2O)8(OH)2]4++2H2O；
[Fe(H2O)8(OH)2]4++H2O→[Fe2(H2O)7(OH)3]3++H3O+；
[Fe2(H2O)7(OH)3]3++[Fe(H2O)5OH]2+→[Fe3(H2O)7(OH)4]5++5H2O；
the above reaction equation expresses the flocculation/sedimentation function of the fenton reaction, and it can be seen that the treatment effect of fenton treatment of wastewater is not simply due to the action of hydroxyl radicals, and the flocculation/sedimentation function also plays an important role.
The working principle of the utility model is as follows:
filtering solid slag, suspended matters and other impurities in the wastewater by a bag filter; then the mixture enters an enamel stirring kettle and is subjected to strong oxidation reaction with Fenton reagent, the reaction is carried out at normal temperature and normal pressure, and the reaction time is about 1 h; the wastewater from the Fenton reactor enters an acid-base adjusting kettle, and sodium hydroxide is added to adjust the pH to be about =8, so that a large amount of ferric hydroxide precipitate is generated; then, treating the wastewater from the regulating kettle by using a plate-and-frame filter press, wherein the filtrate is continuously pumped into an evaporation device for evaporation treatment; then the evaporated fraction enters a temporary waste water storage tank to be detected as COD; then transport waste water to the COD detector through artifical sample or through the sampling tube and detect, when its COD reaches the drainage index, can directly discharge, if exceed standard, then keep in the jar with waste water during whole waste water returns the fenton reactor through the circulating pump to add quantitative fenton reagent and react again according to the COD value.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (8)
1. An apparatus for treating high concentration COD waste water, comprising:
the device comprises a filtering device, wherein a discharge port of the filtering device is sequentially connected with a Fenton reaction device, a regulating device, a treatment device, an evaporation device and a temporary storage device through pipelines, the temporary storage device is provided with a detection mechanism for detecting the COD (chemical oxygen demand) of the wastewater in the temporary storage device, and a wastewater circulating mechanism is also arranged between the temporary storage device and the Fenton reaction device; waste water circulation mechanism includes the circulating pump, the income delivery end of circulating pump is passed through the connecting pipe and is connected fenton response equipment and temporary storage equipment respectively, install the fourth valve on the connecting pipe.
2. The apparatus for treating high concentration COD waste water according to claim 1, wherein: the filtering equipment adopts a bag filter; the Fenton reaction equipment adopts an enamel stirring kettle.
3. The apparatus for treating high concentration COD waste water according to claim 1, wherein: the adjusting device adopts an acid-base adjusting kettle; the treatment equipment adopts a plate-and-frame filter press; the evaporation equipment adopts a single-effect evaporator or a double-effect evaporator.
4. The apparatus for treating high concentration COD waste water according to claim 2, wherein: the temporary storage equipment is a temporary storage tank; the detection mechanism comprises a COD detector arranged outside.
5. The apparatus for treating high concentration COD waste water according to claim 4, wherein: the sealing cover of the upper end of the temporary storage tank is provided with a sampling port, and the sampling port is embedded with a leakage-proof plug.
6. The apparatus for treating high concentration COD waste water according to claim 5, wherein: the side wall of the temporary storage tank is provided with a water outlet, and a first valve is installed at the water outlet.
7. The apparatus for treating high concentration COD waste water according to claim 5, wherein: the utility model discloses a COD detector, including the COD detector, the tank lateral wall of keeping in is connected with the sampling tube, the second valve is installed to the extension end of sampling tube, the output of second valve is corresponding with the reagent pipe on the COD detector.
8. The apparatus for treating high concentration COD waste water according to claim 7, wherein: the sampling tube is communicated with a return pipe, the extending end of the return pipe is communicated with the temporary storage tank, and the return pipe is provided with a return pump and a third valve.
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| CN202122002578.9U CN215365313U (en) | 2021-08-24 | 2021-08-24 | Device for treating high-concentration COD wastewater |
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