CN216236545U - Coal chemical wastewater treatment device - Google Patents
Coal chemical wastewater treatment device Download PDFInfo
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- CN216236545U CN216236545U CN202122150866.9U CN202122150866U CN216236545U CN 216236545 U CN216236545 U CN 216236545U CN 202122150866 U CN202122150866 U CN 202122150866U CN 216236545 U CN216236545 U CN 216236545U
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Abstract
The utility model relates to a coal chemical wastewater treatment device, and belongs to the technical field of wastewater treatment. A flocculation reaction-sedimentation tank, an ozone catalytic oxidation device, a biological activated carbon filter, an intermediate water tank, an ultrafiltration unit and a reverse osmosis unit are sequentially communicated along the water inlet direction; the flocculation reaction-sedimentation tank adopts an integrated structure and is coupled with a dosing system connected with the flocculation reaction-sedimentation tank, and the ozone catalytic oxidation device is coupled with the biological activated carbon filter; the flocculation reaction-sedimentation tank is provided with an image recognition device, and the image recognition device recognizes and compares flocs in the flocculation reaction-sedimentation tank, feeds back the result to the dosing system and controls the dosing amount of the medicament. The device solves the technical problems that the membrane elements are polluted and the biomembranes of the membrane elements are blocked because of inaccurate dosage of the medicament during flocculation and precipitation reactions in the traditional device and process, reduces the dosage of ozone and bactericide, and prolongs the service life of the active carbon.
Description
Technical Field
The utility model belongs to the technical field of wastewater treatment, and relates to a coal chemical wastewater treatment device.
Background
The components of the coal chemical wastewater vary with the processing technology, and mainly include coal gas wastewater, coal oil wastewater, coal coking wastewater, coal methanol wastewater, olefin wastewater, and the like. But all contain aromatic compounds and heterocyclic compounds, the waste water has complex components and high pollutant concentration, phenol and cyanogen toxic substances in the waste water inhibit the activity of microorganisms, and the waste water has poor biodegradability and is not easy to biodegrade. The biochemical water pollutants are mainly macromolecular organic matters which are difficult to degrade, and the CODcr is more than or equal to 200mg/L generally, thus providing great challenge for sewage recycling. The existing recycling process generally adopts the following steps: biochemical effluent, flocculation, precipitation, multi-medium filtration, advanced oxidation, filtration, ultrafiltration unit, reverse osmosis unit and effluent recycling, the process flow is long, and the capital investment and the operating cost are high.
Conventional flocculation units, flocculants such as polyaluminium chloride, ferric chloride or cationic polyelectrolytes, which bind to tiny colloids and particles and aggregate into large scale flocculants, can be retained by the filtration process when these flocculants are dosed in excess, but it is particularly noted that if the overdosing is exceeded, they may be trapped inside the filter element and contaminate the membrane surface. In addition, the positively charged polymer and the negatively charged scale inhibitor can also undergo precipitation reaction to contaminate the membrane elements.
After flocculation-filtration, the microorganisms contained in the wastewater enter the reverse osmosis system, and organic nutrients with solubility in water are found, and the organic nutrients are concentrated and enriched on the surface of the reverse osmosis membrane along with the progress of the reverse osmosis process, so that the ideal environment and process for forming the biological membrane are realized. The biological pollution of the membrane element can seriously affect the performance of a reverse osmosis system, the pressure difference between inlet water and concentrated water is rapidly increased, and sometimes, the biological pollution can also occur even on the water production side of the membrane element, so that product water is polluted. Once biofouling occurs and biofilm develops, cleaning is very difficult. Since the biofilm protects the microorganisms from the hydraulic shear forces and from the disinfection of chemicals, moreover, a biofilm that has not been completely removed will cause a rapid growth of microorganisms again. The control of microorganisms is therefore the most important task in the pretreatment process. The current common method is to add bactericide, and the adding of bactericide increases the operation cost and accurately controls the dosage of bactericide.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model aims to provide a coal chemical wastewater treatment device, which solves the technical problems that the membrane elements are polluted and the biological membranes of the membrane elements are blocked due to inaccurate dosage of a medicament during flocculation and precipitation reactions in the traditional device and process, reduces the dosage of ozone and a bactericide, and prolongs the service life of activated carbon.
In order to achieve the purpose, the utility model provides the following technical scheme:
a coal chemical wastewater treatment device is sequentially communicated with a flocculation reaction-sedimentation tank, an ozone catalytic oxidation device, a biological activated carbon filter tank, an intermediate water tank, an ultrafiltration unit and a reverse osmosis unit along the water inlet direction; the flocculation reaction-sedimentation tank adopts an integrated structure and is coupled with a dosing system connected with the flocculation reaction-sedimentation tank, and the ozone catalytic oxidation device is coupled with the biological activated carbon filter; the flocculation reaction-sedimentation tank is provided with an image recognition device, and the image recognition device recognizes and compares flocs in the flocculation reaction-sedimentation tank, feeds back a result to a dosing system and controls the dosing amount of the medicament.
Further, the image recognition device comprises an underwater camera arranged in the flocculation reaction-sedimentation tank and a far-end server in signal connection with the underwater camera, the underwater camera shoots images of the flocs in the flocculation reaction-sedimentation tank in real time and transmits the images to the server, the server recognizes the images and compares the images with a large number of floc images stored in the server, and feeds the results back to the dosing system to control the dosing amount of the medicament; and a turbidity meter, a conductivity meter and a COD on-line monitor are also arranged in the flocculation reaction-sedimentation tank.
Further, when the grain diameter of the shot flocs is less than or equal to 20-50% of the optimal grain diameter of the stored flocs, or the compactness is lower than 10-60% of the optimal compactness, the dosage is adjusted.
Further, the flocculation reaction-sedimentation tank is provided with a return pipe; the flocculation reaction-sedimentation tank is directly connected with the ozone catalytic oxidation device, and a filtering device is not arranged in the middle.
Further, the chemicals added by the chemical adding system are a flocculating agent, a hardness removing agent and an adsorbent, and the adsorbent is one of powdered activated carbon, diatomite or sepiolite.
Furthermore, special microbial agents for degrading CODcr, phenol, quinoline and thiocyanate radicals are inoculated in the biological activated carbon filter.
Further, the biological activated carbon filter is sequentially filled with biological activated carbon from top to bottom, and the filling height is 20% -50% of the total height of the carbon filter; the filling height of the activated carbon with the granularity of 20-40 meshes is 30-40% of the total height of the carbon pool; the filling height of the quartz sand with the granularity of 0.5 mm-2 mm is 10% -30% of the total height.
Furthermore, the particle size of the biological activated carbon in the biological activated carbon filter is 0.5-2 mm.
Furthermore, the ultrafiltration unit adopts one of a tubular membrane, a plate-type membrane or a spiral-wound membrane and adopts terminal filtration or cross-flow filtration.
Further, the reverse osmosis unit adopts one of a tubular membrane, a plate-type membrane or a spiral-wound membrane, and adopts terminal filtration or cross-flow filtration.
The utility model has the beneficial effects that:
the flocculation reaction-sedimentation tank is coupled with a dosing system, the dosing amount is intelligently controlled through the generation condition of internal flocs, the practical amount of a medicament is reduced, the flocs in the wastewater are not excessive, and the turbidity of the effluent of the flocculation-sedimentation tank is less than or equal to 5NTU (nitrilotris urethane), so that a traditional filtering unit is omitted, a process flow step is reduced, and the wastewater treatment efficiency is improved; in order to exert the adsorption performance of the adsorbent in the flocculation reaction-sedimentation tank and save the cost of the adsorbent, the sludge in the flocculation reaction-sedimentation tank flows back according to the proportion of 10 to 40 percent, thereby saving the cost and improving the flocculation efficiency and the sedimentation effect. The ozone catalytic oxidation pond is coupled with the biological activated carbon filter, and the number of microorganisms and CODcr at the water outlet of the biological activated carbon filter are fed back to the ozone catalytic oxidation device, so that the ozone adding amount can be reduced, most of microorganisms can be limited in the biological activated carbon filter, the reverse osmosis performance of microorganisms enriched on a membrane element is prevented from being influenced, the adding of a bactericide of a follow-up system is reduced, and the backwashing frequency of a membrane system is reduced.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a coal chemical wastewater treatment process;
reference numerals: a flocculation reaction-sedimentation tank 1, an ozone catalytic oxidation device 2, a biological activated carbon filter 3, an intermediate water tank 4, an ultrafiltration unit 5, a reverse osmosis unit 6 and a dosing system 7.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the utility model only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the utility model thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a coal chemical wastewater treatment device is sequentially communicated with a flocculation reaction-sedimentation tank 1, an ozone catalytic oxidation device 2, a biological activated carbon filter 3, a middle water tank 4 for transferring, an ultrafiltration unit 5 and a reverse osmosis unit 6 along a water inlet direction; the flocculation reaction-sedimentation tank 1 is of an integrated structure, and a return pipe is connected between a water outlet and a water inlet of the flocculation reaction-sedimentation tank 1; the flocculation reaction-sedimentation tank 1 is directly connected with the ozone catalytic oxidation device 2, and a filtering device is not arranged in the middle; the flocculation reaction-sedimentation tank 1 is coupled with a dosing system 7 connected with the flocculation reaction-sedimentation tank, and the ozone catalytic oxidation device 2 is coupled with the biological activated carbon filter 3. The medicament added by the medicament adding system 7 is a flocculating agent, a hardness removing agent and an adsorbent, wherein the adsorbent is one of powdered activated carbon, diatomite or sepiolite; the particle size of the biological activated carbon in the biological activated carbon filter 3 is 0.5-2 mm.
The flocculation reaction-sedimentation tank 1 is internally provided with instruments such as a turbidimeter, a conductivity meter, a COD (chemical oxygen demand) on-line monitor and the like, and is also provided with an image recognition device, the image device comprises an underwater camera arranged in the flocculation reaction-sedimentation tank 1 and a far-end server in signal connection with the underwater camera, the underwater camera shoots floc images in the flocculation reaction-sedimentation tank 1 in real time and transmits the images to the server, the images are recognized by the server and then compared with a large number of floc images stored in the server, the results are fed back to a dosing system 7, and the dosing amount of the medicament is controlled.
According to above-mentioned coal chemical wastewater treatment device to handle COD 250 ~ 300mg/L, TDS 6000 ~ 10000 mg/L's coking wastewater as the example, the process steps are as follows:
s1, adding a medicine for precipitation, enabling coking wastewater to enter a flocculation reaction-precipitation tank 1 from the upper part, adding a flocculating agent PFS, PAM, a hardness removing agent and a powdered activated carbon adsorbent, shooting images of flocs in the precipitation tank in real time by an underwater camera, transmitting the images to a server, identifying the images by the server, comparing the images with a large number of floc images stored in the server, feeding the images back to a medicine adding system 7, and starting to adjust the medicine adding amount when the particle size of the flocs is less than or equal to 20-50% of the optimal particle size or the compactness is less than 10-60% of the optimal compactness; in the embodiment, if the particle size of the flocs is less than 20% of the optimal particle size of the flocs, or if the density of the flocs is less than 25% of the optimal density, the dosage of the medicament is increased, otherwise, the dosage of the medicament is reduced, and the turbidity of the effluent is lower than 5 NTU;
s2, partial reflux is carried out, the adsorption effect of the powdery activated carbon adsorbent is fully exerted, the sludge flowing out of the flocculation reaction-sedimentation tank 1 flows back to a water inlet of the flocculation reaction tank through a reflux pipe, and the reflux ratio can be 10-40%; in the embodiment, 20% of reflux is adopted to flow to the reaction tank;
s3, ozone catalysis, namely filling ozone into the coal chemical wastewater entering the ozone catalytic oxidation device 2, and oxidizing macromolecular substances in the wastewater into substances which can be utilized by micromolecular microorganisms; rather than directly mineralizing it to CO 2;
s4, biodegradation, namely inoculating special microbial inoculums for degrading CODcr, phenol, quinoline, thiocyanate radical and the like into the biological activated carbon filter 3, filling the wastewater into the upper part of the biological activated carbon filter 3, discharging the wastewater from the lower part of the biological activated carbon filter 3, and enabling the organisms to move above 1/2 of the biological activated carbon filter 3 so as to ensure that the number of microorganisms in the discharged water is within a controllable range and quickly degrade organic matters in the wastewater;
s5, biofeedback, namely enabling the ozone catalytic oxidation device 2 to control the filling amount of ozone according to the microbial quantity and the organic matter concentration CODcr at the water outlet of the biological activated carbon filter 3 as control indexes; to control the extent of ozone catalysis thereof; and the design operation parameters of the biological activated carbon filter 3 are cooperatively controlled, the biological activated carbon filter is sequentially filled with biological activated carbon from top to bottom, and the filling height is 20-50% of the height of the biological activated carbon filter 3; wherein the filling height of the activated carbon with the granularity of 20-40 meshes is 30-40% of the total height of the carbon pool; the filling height of the quartz sand with the granularity of 0.5 mm-2 mm is 10% -30% of the total height.
S6, ultrafiltration, namely introducing effluent from the biological activated carbon filter 3 into an ultrafiltration unit 5, wherein the wastewater is treated by adopting a spiral membrane through cross flow filtration; the ultrafiltration unit 5 can also adopt terminal filtration wastewater filtration, and the membrane element can also adopt one of a tubular membrane and a plate membrane;
s7, reverse osmosis, namely introducing the effluent of the ultrafiltration unit 5 into a reverse osmosis unit 6, wherein the embodiment adopts an anti-pollution roll-type membrane and adopts cross-flow filtration for osmosis; the reverse osmosis unit 6 can also adopt a tubular membrane and terminal filtration, and both can ensure that the water recovery rate of the membrane treatment unit is 65-85 percent and the desalination rate is 90-99 percent.
And finally, detecting that COD (chemical oxygen demand) in the water subjected to reverse osmosis is less than or equal to 20mg/L and TDS (total dissolved solids) is 100-200 mg/L, and showing that the device can effectively improve the water quality of the coking wastewater to enable the coking wastewater to reach a recycling state.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a coal chemical industry effluent treatment plant which characterized in that: a flocculation reaction-sedimentation tank, an ozone catalytic oxidation device, a biological activated carbon filter, an intermediate water tank, an ultrafiltration unit and a reverse osmosis unit are sequentially communicated along the water inlet direction; the flocculation reaction-sedimentation tank adopts an integrated structure and is coupled with a dosing system connected with the flocculation reaction-sedimentation tank, and the ozone catalytic oxidation device is coupled with the biological activated carbon filter; the flocculation reaction-sedimentation tank is provided with an image recognition device, and the image recognition device recognizes and compares flocs in the flocculation reaction-sedimentation tank, feeds back a result to a dosing system and controls the dosing amount of the medicament.
2. The coal chemical industry wastewater treatment device according to claim 1, characterized in that: the image recognition equipment comprises an underwater camera arranged in the flocculation reaction-sedimentation tank and a remote server in signal connection with the underwater camera, wherein the underwater camera shoots images of flocs in the flocculation reaction-sedimentation tank in real time and transmits the images to the server, the images are recognized by the server and then compared with a large number of floc images stored in the server, and the results are fed back to a dosing system to control the dosing amount of the medicament; and a turbidity meter, a conductivity meter and a COD on-line monitor are also arranged in the flocculation reaction-sedimentation tank.
3. The coal chemical industry wastewater treatment device according to claim 1, characterized in that: the flocculation reaction-sedimentation tank is provided with a return pipe; the flocculation reaction-sedimentation tank is directly connected with the ozone catalytic oxidation device, and a filtering device is not arranged in the middle.
4. The coal chemical industry wastewater treatment device according to claim 1, characterized in that: the biological activated carbon filter is sequentially filled with biological activated carbon from top to bottom, and the filling height is 20% -50% of the total height of the carbon filter; the filling height of the activated carbon with the granularity of 20-40 meshes is 30-40% of the total height of the carbon pool; the filling height of the quartz sand with the granularity of 0.5 mm-2 mm is 10% -30% of the total height.
5. The coal chemical industry wastewater treatment device according to claim 1, characterized in that: the particle size of the biological activated carbon in the biological activated carbon filter is 0.5-2 mm.
6. The coal chemical industry wastewater treatment device according to claim 1, characterized in that: the ultrafiltration unit adopts one of a tubular membrane, a plate-type membrane or a roll-type membrane and adopts terminal filtration or cross flow filtration.
7. The coal chemical industry wastewater treatment device according to claim 1, characterized in that: the reverse osmosis unit adopts one of a tubular membrane, a plate-type membrane or a roll-type membrane and adopts terminal filtration or cross flow filtration.
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| CN202122150866.9U CN216236545U (en) | 2021-09-07 | 2021-09-07 | Coal chemical wastewater treatment device |
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| CN202122150866.9U CN216236545U (en) | 2021-09-07 | 2021-09-07 | Coal chemical wastewater treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956287A (en) * | 2022-06-14 | 2022-08-30 | 西安清源盈科环保科技有限公司 | Sewage dephosphorization method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956287A (en) * | 2022-06-14 | 2022-08-30 | 西安清源盈科环保科技有限公司 | Sewage dephosphorization method |
| CN114956287B (en) * | 2022-06-14 | 2023-08-29 | 西安清源盈科环保科技有限公司 | Sewage dephosphorization method |
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