CN111533320B - Organic wastewater treatment device and method - Google Patents
Organic wastewater treatment device and method Download PDFInfo
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- CN111533320B CN111533320B CN202010431939.9A CN202010431939A CN111533320B CN 111533320 B CN111533320 B CN 111533320B CN 202010431939 A CN202010431939 A CN 202010431939A CN 111533320 B CN111533320 B CN 111533320B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004065 wastewater treatment Methods 0.000 title claims description 7
- 238000001179 sorption measurement Methods 0.000 claims abstract description 78
- 239000010881 fly ash Substances 0.000 claims abstract description 72
- 239000002351 wastewater Substances 0.000 claims abstract description 69
- 238000005352 clarification Methods 0.000 claims abstract description 38
- 239000010802 sludge Substances 0.000 claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 32
- 230000003647 oxidation Effects 0.000 claims abstract description 31
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 21
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 239000002244 precipitate Substances 0.000 claims abstract description 13
- 238000005189 flocculation Methods 0.000 claims abstract description 11
- 230000016615 flocculation Effects 0.000 claims abstract description 11
- 230000018044 dehydration Effects 0.000 claims abstract description 10
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 10
- 238000004537 pulping Methods 0.000 claims description 9
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000008399 tap water Substances 0.000 claims description 8
- 235000020679 tap water Nutrition 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- 239000013049 sediment Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000000701 coagulant Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000008394 flocculating agent Substances 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 230000001376 precipitating effect Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 208000005156 Dehydration Diseases 0.000 abstract 2
- 230000006872 improvement Effects 0.000 description 8
- 239000010883 coal ash Substances 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 229920002401 polyacrylamide Polymers 0.000 description 1
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/30—Organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a device and a method for treating organic wastewater, wherein the device comprises: the inlet end of the sedimentation tank is connected with the cleaning tank, and the bottom end of the sedimentation tank is connected with the inlet end of the adsorption tank; the inlet end of the clarification tank is connected with the outlet end of the adsorption tank, and the outlet end of the clarification tank is connected with the water inlet of the oxidation tank; the ozone generator is connected with the gas distribution system; the inlet end of the sludge dewatering system is respectively connected with the bottom end of the adsorption tank and the bottom end of the clarification tank, the first outlet end of the sludge dewatering system is connected with the inlet end of the adsorption tank, and the second outlet end of the sludge dewatering system is connected with the boiler. The method comprises the following steps: dissolving water-soluble substances in the fly ash; organic matters in the organic wastewater are adsorbed by the fly ash; removing suspended matters and partial COD in the organic wastewater by flocculation and clarification; organic matters in the organic wastewater after adsorption treatment are oxidized and removed by ozone; and (4) carrying out dehydration treatment on the precipitate in the sludge dehydration system, and then conveying the precipitate into a boiler to be mixed with raw coal for incineration treatment.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a device and a method for treating organic wastewater.
Background
The treatment method of the sludge in China mainly takes agricultural utilization and landfill as main points, but the two methods are only suitable for the sludge with poor quality, can not effectively solve the problem of sludge resource utilization, and are easy to cause secondary pollution. With the increasingly strict environmental protection policy in China, the landfill proportion will be reduced. The sludge mixed burning technology of the coal-fired unit is used as a sludge burning utilization form, has the characteristics of high treatment capacity, strong adaptability and the like, and is widely concerned.
In order to save energy, the sludge co-combustion in the coal-fired power plant is generally performed by sludge dehydration, namely, mechanical dehydration sludge discharged from a sewage plant in the power plant is firstly dehydrated to reduce the water content from 60-80% to below 40%, and then is conveyed to a coal conveying system of a coal-fired unit for co-combustion. Therefore, a certain amount of high-concentration organic filtrate is generated in the dehydration process, COD and ammonia nitrogen in the filtrate are high, but the water amount is not large, so that a complex biochemical treatment system is generally required to be built for treating the wastewater in a power plant, the investment is high, the operation and maintenance are difficult, and great inconvenience is brought to the power plant. In addition, in many fields such as power plant domestic sewage, coking wastewater and the like, a large amount of organic wastewater needs to be treated.
In order to avoid the use of the traditional treatment method, realize the standard discharge of COD in the desulfurization wastewater and solve the problems in the triple box process, the development of an efficient COD treatment method for the desulfurization wastewater is urgent.
Disclosure of Invention
In order to solve the above problems, the present invention provides an apparatus and a method for treating organic wastewater.
The invention provides an organic wastewater treatment device, which comprises:
the inlet end of the sedimentation tank is connected with the cleaning tank, and the bottom end of the sedimentation tank is connected with the inlet end of the adsorption tank;
the inlet end of the clarification tank is connected with the outlet end of the adsorption tank, and the outlet end of the clarification tank is connected with the water inlet of the oxidation tank;
the ozone generator is connected with a gas distribution system inside the oxidation pond;
and the inlet end of the sludge dewatering system is respectively connected with the bottom end of the adsorption tank and the bottom end of the clarification tank, the first outlet end of the sludge dewatering system is connected with the inlet end of the adsorption tank, and the second outlet end of the sludge dewatering system is connected with the boiler.
As a further improvement of the invention, the upper part in the adsorption tank is provided with a flow baffle which is in a shape of a conical ring with a small upper part and a big lower part and is fixedly connected with the top wall of the adsorption tank through the upper edge of the flow baffle.
As a further improvement of the invention, a flocculating agent and coagulant aid adding device is arranged in the clarification tank.
As a further improvement of the invention, the water inlet and the gas distribution system are both arranged at the bottom of the oxidation pond.
As a further improvement of the invention, the upper part of the oxidation pond is provided with a water outlet.
As a further improvement of the invention, the system also comprises a pulping system which is connected with the outlet end of the sedimentation tank.
As a further improvement of the invention, the adsorption tank and the cleaning tank are respectively provided with a first stirrer and a second stirrer.
The invention also provides a method for treating the organic wastewater, which comprises the following steps:
step 1, adding tap water and fly ash into a cleaning pool, and dissolving water-soluble substances in the fly ash by stirring;
step 2, conveying all the substances in the cleaning tank into a sedimentation tank, separating undissolved coal ash from an aqueous solution through the action of gravity, precipitating and enriching the undissolved coal ash in the sedimentation tank, and conveying the undissolved coal ash into an adsorption tank;
step 3, introducing the organic wastewater into an adsorption tank to fully contact with the washed fly ash, so that organic matters and ammonia nitrogen substances in the organic wastewater are adsorbed by the fly ash until the fly ash is saturated in adsorption, and discharging the fly ash into a sludge dewatering system;
step 4, overflowing the organic wastewater subjected to adsorption treatment into a clarification tank, removing suspended matters and partial COD (chemical oxygen demand) in the organic wastewater through flocculation and clarification, and respectively conveying sediments and supernate generated after flocculation clarification into a sludge dewatering system and an oxidation tank;
step 5, reacting the organic wastewater in the oxidation pond with ozone, removing organic matters contained in the organic wastewater by oxidation, and discharging the organic matters through a water outlet after the content of the organic matters in the organic wastewater reaches the standard;
and 6, dehydrating the precipitate in the sludge dehydration system, conveying the dehydrated precipitate to a boiler to be mixed with raw coal for incineration treatment, and incinerating and removing the organic matters adsorbed by the fly ash.
As a further improvement of the invention, the aqueous solution separated by the sedimentation in the sedimentation tank in the step 2 is conveyed to a pulping system to be made into limestone slurry in a wet desulphurization process for absorbing sulfur dioxide in flue gas.
As a further improvement of the invention, the adding amount of the fly ash conveyed into the adsorption tank in the step 2 is 2-10%, and the pH value of the mixed solution in the adsorption tank is 6-8 by adding acid treatment.
The invention has the beneficial effects that: the COD and ammonia nitrogen in the organic wastewater are removed by the adsorption of the washed fly ash, so that the adsorption characteristic of the fly ash is fully utilized, and the wastewater is discharged up to the standard at low cost; meanwhile, the alkaline substance in the fly ash is used as a desulfurizer, so that the cost of the medicament can be saved, and the purpose of treating wastes with processes of wastes against each other is realized; organic matters in the wastewater are subjected to incineration treatment, and the generated heat can be used for generating electricity; has the advantages of low operation cost, simple control, no secondary pollution and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural view of an apparatus for treating organic wastewater according to an embodiment of the present invention.
In the figure, the position of the upper end of the main shaft,
1. an adsorption tank; 2. a first stirrer; 3. a clarification tank; 4. an oxidation pond; 5. a water inlet; 6. a gas distribution system; 7. a water outlet; 8. an ozone generator; 9. a sludge dewatering system; 10. a boiler; 11. a cleaning tank; 12. a second agitator; 13. a sedimentation tank; 14. a pulping system; 15. keep off the flow board.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, in the description of the present invention, the terms used are for illustrative purposes only and are not intended to limit the scope of the present invention. The terms "comprises" and/or "comprising" are used to specify the presence of stated elements, steps, operations, and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations, and/or components. The terms "first," "second," and the like may be used to describe various elements, not necessarily order, and not necessarily limit the elements. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. These terms are only used to distinguish one element from another. These and/or other aspects will become apparent to those of ordinary skill in the art in view of the following drawings, and the description of the embodiments of the present invention will be more readily understood by those of ordinary skill in the art. The drawings are only for purposes of illustrating the described embodiments of the invention. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated in the present application may be employed without departing from the principles described in the present application.
Example 1, as shown in fig. 1, an apparatus for treating organic wastewater according to an embodiment of the present invention includes:
the inlet end of the sedimentation tank 13 is connected with the cleaning tank 11, and the bottom end of the sedimentation tank 13 is connected with the inlet end of the adsorption tank 1;
the inlet end of the clarification tank 3 is connected with the outlet end of the adsorption tank 1, and the outlet end of the clarification tank 3 is connected with the water inlet 5 of the oxidation tank 4;
the ozone generator 8 is connected with the gas distribution system 6 in the oxidation pond 4;
the inlet end of the sludge dewatering system 9 is respectively connected with the bottom end of the adsorption tank 1 and the bottom end of the clarification tank 3, the first outlet end of the sludge dewatering system 9 is connected with the inlet end of the adsorption tank 1, and the second outlet end of the sludge dewatering system 9 is connected with the boiler 10.
The cleaning pool 11 is used for carrying out water pool treatment on the fly ash, mixing tap water and the fly ash, dissolving water-soluble substances in the fly ash through stirring, and simultaneously washing off various impurities on the surface of the undissolved fly ash to avoid influencing the subsequent treatment process of the organic wastewater. The sedimentation tank 13 is used for separating the undissolved fly ash after washing, and the undissolved fly ash is enriched at the bottom of the sedimentation tank 13 under the action of gravity. The adsorption tank 1 is used for adsorbing organic matters or ammonia nitrogen and other substances which can be adsorbed by the fly ash in the organic wastewater. The clarification tank 3 is used for flocculating and precipitating the organic wastewater after the adsorption treatment to remove suspended matters in the organic wastewater. The oxidation pond 4 is used for oxidizing the organic matters in the organic wastewater after the flocculation clarification treatment, so that the organic matters are oxidized and removed by ozone. The ozone generator 8 is used for preparing ozone, and the gas distribution system 6 is used for conveying ozone gas to the oxidation pond 4 for reaction. The sludge dewatering system 9 is used for dewatering the precipitate generated by the fly ash and the suspended matters in the organic wastewater, which are adsorbed with the organic matters. The boiler 10 is used for mixing and burning the dehydrated fly ash and suspended solid sediment with raw coal, and providing a heat source for a thermal power generation system.
Furthermore, a flow baffle 15 is arranged at the upper part in the adsorption tank 1, and the flow baffle 15 is in a shape of a conical ring with a small upper part and a big lower part and is fixedly connected with the top wall of the adsorption tank 1 through the upper edge of the flow baffle 15. The adsorption tank 1 used in the application is of a trapezoidal structure with a large upper part and a small lower part, and the included angle between the bottom edge and the side edge of the adsorption tank 1 is 110-135 degrees, so that the adsorption medium can be prevented from being deposited on the side wall due to the overlarge included angle, and then the adsorption medium can be prevented from being deposited at the included angle between the bottom edge and the side edge due to the undersize included angle, and further, the mixed liquid in the adsorption tank 1 is ensured to be in a vulcanization state and has a clarification function. The flow baffle 15 is used for retaining the washed fly ash in the adsorption tank 1 to prevent the fly ash from overflowing upwards. The specific setting parameters of the baffle plate 15 in this application are: the distance between the lower edge of the flow baffle 15 and the inner side wall of the adsorption tank 1 is 10-30 cm, the distance between the lower edge of the flow baffle 15 and the upper liquid level is 30-100 cm, and the included angle between the flow baffle 15 and the inner top wall of the adsorption tank 1 is larger than 45 degrees. In the practical application process, the adsorption tank 1 and the flow baffle 15 may also adopt other arrangements, not limited to the above arrangement.
Further, a flocculating agent and coagulant aid adding device is arranged inside the clarification tank 3. The flocculating agent and coagulant aid adding device can supplement the flocculating agent or the coagulant aid into the clarification tank 3 according to the concentration of the flocculating agent and the coagulant aid in the clarification tank 3. Avoiding the subsequent organic wastewater treatment from being influenced along with the flocculation of suspended matters in the organic wastewater.
Further, the water inlet 5 and the gas distribution system 6 are both arranged at the bottom of the oxidation pond 4. The water inlet 5 and the gas distribution system 6 are arranged in such a way that the organic wastewater entering the oxidation pond 4 is fully contacted with the gas distribution system 6, so that the problem that the organic wastewater and the gas distribution system have height difference to cause insufficient reaction of organic matters in the organic wastewater or overlarge ozone consumption is avoided.
Further, the upper part of the oxidation pond 4 is provided with a water outlet 7. When the organic matters in the organic wastewater in the oxidation pond 4 are completely oxidized, the organic matters in the organic wastewater reach the standard and are discharged through the water outlet 7.
Further, a pulping system 14 is also included, which is connected to the outlet end of the sedimentation tank 13. The fly ash aqueous solution in the sedimentation tank 13 is conveyed to the pulping system 14 for generating limestone slurry in the falling of the wet flue gas and removing sulfur dioxide in the flue gas.
Further, the adsorption tank 1 and the cleaning tank 11 are provided with a first stirrer 2 and a second stirrer 12, respectively. The first stirrer 2 is used for stirring the organic wastewater in the adsorption tank 1 and the washed fly ash to uniformly mix the organic wastewater and the washed fly ash, so that suspended matters, ammonia nitrogen and other substances in the organic wastewater are fully adsorbed by the fly ash. The second stirring device is used for stirring the fly ash and the tap water in the cleaning pool 11 to ensure that the fly ash and the tap water are fully contacted, effectively cleaning the fly ash and fully dissolving the water-soluble substances in the fly ash.
Example 2, the present invention also provides a method for treating organic wastewater, comprising the steps of:
step 1, adding tap water and fly ash into a cleaning pool 11, and stirring to dissolve water-soluble substances in the fly ash. The water-soluble substances in the fly ash comprise calcium oxide, magnesium oxide and the like.
Step 2, conveying all the substances in the cleaning tank 11 into a sedimentation tank 13, separating undissolved coal ash from an aqueous solution through the action of gravity, precipitating and enriching the undissolved coal ash in the sedimentation tank 13, and conveying the undissolved coal ash into an adsorption tank 1;
step 3, introducing the organic wastewater into the adsorption tank 1 to fully contact with the washed fly ash, so that organic matters and ammonia nitrogen substances in the organic wastewater are adsorbed by the fly ash until the fly ash is saturated in adsorption, and discharging the fly ash into a sludge dewatering system 9;
step 4, the organic wastewater after adsorption treatment overflows into a clarification tank 3, suspended matters and partial COD in the organic wastewater are removed through flocculation and clarification, and precipitates and supernatant generated after flocculation clarification are respectively conveyed into a sludge dewatering system 9 and an oxidation tank 4;
step 5, reacting the organic wastewater in the oxidation pond 4 with ozone, removing organic matters contained in the organic wastewater by oxidation, and discharging the organic matters in the organic wastewater through a water outlet 7 after the content of the organic matters in the organic wastewater reaches the standard;
and 6, dehydrating the precipitate in the sludge dehydration system 9, conveying the dehydrated precipitate to a boiler 10, mixing the dehydrated precipitate with raw coal, and incinerating the mixture to remove organic matters adsorbed by the fly ash. The main component of the sediment generated in the adsorption tank 1 and the clarification tank 3 is fly ash, the sediment after dehydration is mixed with raw coal and then enters a boiler 10 for incineration treatment, pollutants adsorbed by the fly ash after high-temperature incineration are thoroughly oxidized and decomposed, and the generated heat is used for power plant power generation, so that the resource utilization of organic matters in wastewater is realized, and the purpose of treating waste with waste is achieved.
Further, the water solution separated by precipitation in the precipitation tank 13 in the step 2 is delivered to the pulping system 14 to be made into limestone slurry in the wet desulphurization process for absorbing sulfur dioxide in the flue gas.
Further, the fly ash is conveyed into the adsorption tank 1 in the step 2, the adding amount of the fly ash in the adsorption tank 1 is controlled to be 2% -10%, namely the adding amount of the fly ash is 2% -10% of the total mixed liquid mass in the adsorption tank 1, so that the situation that the adding amount of the fly ash is too much to increase stirring power is avoided; or the treatment effect cannot be achieved due to the addition of too little fly ash. The pH value of the mixed liquid in the adsorption tank 1 is 6-8 by adding acid.
In the application, taking the deep dehydration filtration liquid treatment of sludge in a certain sludge co-combustion power plant as an example, firstly, tap water is injected into a cleaning tank 11, and fly ash is added, the fly ash and the tap water are uniformly mixed through a second stirrer 12, so that water-soluble substances (calcium oxide, magnesium oxide and the like) in the fly ash are dissolved, then, under the action of gravity, the fly ash is separated from a water solution in a sedimentation tank 13, and the supernatant of the sedimentation tank 13 enters a pulping system 14 to prepare limestone slurry which is used for removing sulfur dioxide in flue gas through a wet desulphurization process. The cleaned fly ash is precipitated and enriched in the sedimentation tank 13 and is conveyed to the adsorption tank 1.
Organic wastewater enters an adsorption tank 1 to be fully contacted with the washed fly ash, the pH value of a mixed solution in the adsorption tank is controlled to be 6-8 by adding sulfuric acid, the adding amount of the fly ash in the adsorption tank 1 is about 10%, organic substances, ammonia nitrogen and other substances in the wastewater are adsorbed in the fly ash, the fly ash is intercepted in the adsorption tank 1 under the action of a flow baffle plate 15, the change of COD (chemical oxygen demand) in the effluent of the adsorption tank 1 is monitored, when the COD obviously rises, the adsorption amount of the fly ash is close to saturation, and then the adsorption process is repeated by replacing new fly ash.
The wastewater after adsorption treatment enters a clarification tank 3 in an overflow mode, polyaluminium chloride and polyacrylamide are added, suspended matters and partial COD in the wastewater are removed through flocculation clarification, and sediment generated by the clarification tank enters a sludge dewatering system 9. Supernatant of the clarification tank enters through a water inlet 5 at the bottom of an oxidation tank 4, ozone generated in an ozone generator 8 enters the oxidation tank 4 through a gas distribution system 6 at the bottom, organic matters in the wastewater are subjected to oxidation reaction under the action of the ozone and are further removed, and the wastewater is finally discharged through a water outlet 7.
The precipitates discharged from the adsorption tank 1 and the clarification tank 3 are mainly fly ash slurry after adsorbing pollutants, and after entering a sludge dewatering system 9 for dewatering, filtrate flows back to the adsorption tank 1 to be mixed with the original machine wastewater, and then the treatment process is repeated. The dehydrated sediment and raw coal are mixed and then enter a boiler 10 for incineration treatment, pollutants adsorbed by the fly ash are thoroughly oxidized and decomposed after high-temperature incineration, and the generated heat is used for power generation of a power plant to realize harmless treatment.
The experimental research result shows that COD in the original sludge dewatering filtrate is 1564mg/L, after adsorption treatment and flocculation clarification, the COD of the effluent of the clarification tank is 327mg/L, the adsorption removal rate is 79%, the COD of the effluent after ozone oxidation treatment is 55mg/L, the oxidation removal rate is 83%, and the total removal rate of the process is 96%, so that the national first-level discharge standard is met.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those of ordinary skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It will be understood by those skilled in the art that while the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. An apparatus for treating organic wastewater, comprising:
the inlet end of the sedimentation tank (13) is connected with the cleaning tank (11), the bottom end of the sedimentation tank (13) is connected with the inlet end of the adsorption tank (1), the adding amount of the fly ash in the adsorption tank (1) is 2-10%, the PH value of the mixed liquid in the adsorption tank (1) is 6-8 through acid adding treatment, and the pulping system (14) is connected with the outlet end of the sedimentation tank (13);
the inlet end of the clarification tank (3) is connected with the outlet end of the adsorption tank (1), and the outlet end of the clarification tank (3) is connected with the water inlet (5) of the oxidation tank (4);
the ozone generator (8) is connected with the gas distribution system (6) in the oxidation pond (4);
the inlet end of the sludge dewatering system (9) is respectively connected with the bottom end of the adsorption tank (1) and the bottom end of the clarification tank (3), the first outlet end of the sludge dewatering system (9) is connected with the inlet end of the adsorption tank (1), and the second outlet end of the sludge dewatering system (9) is connected with the boiler (10);
a flow baffle plate (15) is arranged at the upper part in the adsorption tank (1), the flow baffle plate (15) is in a conical ring shape with a small upper part and a big lower part and is fixedly connected with the top wall of the adsorption tank (1) through the upper edge of the flow baffle plate, and the included angle between the flow baffle plate (15) and the inner top wall of the adsorption tank (1) is more than 45 degrees;
the method for treating the organic wastewater by the organic wastewater treatment device comprises the following steps:
step 1, adding tap water and fly ash into a cleaning pool (11), and stirring to dissolve water-soluble substances in the fly ash;
step 2, conveying all substances in the cleaning tank (11) into a sedimentation tank (13), separating undissolved fly ash from an aqueous solution through the action of gravity, precipitating and enriching the undissolved fly ash in the sedimentation tank (13), conveying the precipitated and enriched fly ash into an adsorption tank (1), and conveying the aqueous solution into a pulping system (14) to prepare limestone slurry in a wet desulphurization process for absorbing sulfur dioxide in flue gas;
step 3, introducing the organic wastewater into an adsorption tank (1) to fully contact with the washed fly ash, so that organic matters and ammonia nitrogen substances in the organic wastewater are adsorbed by the fly ash until the fly ash is saturated in adsorption, and discharging the fly ash into a sludge dewatering system (9);
step 4, overflowing the organic wastewater subjected to adsorption treatment into a clarification tank (3), removing suspended matters and partial COD in the organic wastewater through flocculation and clarification, and respectively conveying sediments and supernate generated after flocculation clarification into a sludge dewatering system (9) and an oxidation tank (4);
step 5, reacting the organic wastewater in the oxidation pond (4) with ozone, removing organic matters contained in the organic wastewater by oxidation, and discharging the organic wastewater through a water outlet (7) after the content of the organic matters in the organic wastewater reaches the standard;
and 6, dehydrating the precipitate in the sludge dehydration system (9), conveying the dehydrated precipitate to a boiler (10), mixing the dehydrated precipitate with raw coal, and incinerating the mixture to remove the organic matters adsorbed by the fly ash.
2. The apparatus for treating organic wastewater according to claim 1, wherein a flocculating agent and coagulant aid adding apparatus is arranged inside the clarifier (3).
3. The organic wastewater treatment device according to claim 1, wherein the water inlet (5) and the gas distribution system (6) are both arranged at the bottom of the oxidation pond (4).
4. The organic wastewater treatment device according to claim 1, wherein the upper part of the oxidation pond (4) is provided with a water outlet (7).
5. The apparatus for treating organic wastewater according to claim 1, wherein the adsorption tank (1) and the washing tank (11) are provided with a first stirrer (2) and a second stirrer (12), respectively.
6. The apparatus for treating organic wastewater according to claim 1, wherein the amount of fly ash fed into the adsorption tank (1) in step 2 is 2-10%, and the pH of the mixed solution in the adsorption tank (1) is adjusted to 6-8 by adding acid.
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