Wastewater treatment equipment and method for treating wastewater using the same

Abstract

The present application provides a wastewater treatment device and a method for treating wastewater using the same. The wastewater treatment device comprises a pretreatment system for removing particulate matter and a decolorization system for decolorizing wastewater from the pretreatment system; the pretreatment system comprises a reaction tank, and a filler is arranged in the reaction tank; the decolorization system comprises a decolorization reactor, and the decolorization reactor is V-shaped as a whole. The method for treating wastewater using the wastewater treatment device comprises: inputting the wastewater into the pretreatment system for a first treatment, and then inputting the wastewater into the decolorization system for a second treatment. The wastewater treatment device provided in the present application and the method for treating wastewater using the same use an adsorption method to remove the chroma in the denitrification wastewater without any residual reagents.

Description

Technical Field

[0001] The present application relates to the field of wastewater treatment, and in particular to a wastewater treatment device and a method for treating wastewater using the same. Background Art

[0002] Non-ferrous metal smelting flue gas contains a large amount of pollutants such as sulfur dioxide and nitrogen oxides. Generally, ozone denitrification process is used to treat nitrogen oxides. After ozone oxidation treatment, alkali solution is sprayed and then discharged. After ozone oxidation of nitrogen oxides in flue gas, nitrate ions, nitrogen dioxide and other substances are produced. The alkali washing wastewater is yellow due to the large amount of nitrate ions and dissolved nitrogen oxides, which makes it difficult for the chromaticity of the wastewater to meet the emission limit requirements in the "Comprehensive Sewage Discharge Standard" when it is discharged. Nitrate ions and dissolved nitrogen oxides are stable and difficult to remove. They are usually treated by adsorption. Since there is a large amount of dust in the smelting flue gas, it is difficult to completely remove ultrafine particles after treatment with dust removal equipment. When mixed with denitrification wastewater in the alkali washing stage, the adsorption column is blocked due to the presence of ultrafine particles when conventional adsorption columns are used for treatment, making it difficult to operate normally. When using coagulation and other methods to remove particulate matter, it is difficult to completely remove the particulate matter due to its small particle size. Therefore, it is urgent to develop decolorization treatment equipment and processes for non-ferrous metal smelting denitrification wastewater. Summary of the invention

[0003] The purpose of this application is to provide a wastewater treatment device and a method for treating wastewater using the same to solve the above-mentioned problems.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] A wastewater treatment plant comprising a pretreatment system for removing particulate matter and a decolorization system for decolorizing wastewater from the pretreatment system;

[0006] The pretreatment system comprises a reaction tank, wherein a filler is arranged in the reaction tank;

[0007] The decolorization system comprises a decolorization reactor, and the decolorization reactor is V-shaped as a whole.

[0008] Preferably, the filler comprises quartz sand.

[0009] Preferably, the reaction tank is provided with a water inlet and a water outlet;

[0010] Preferably, in the height direction along the reaction tank, the position of the water inlet is higher than the position of the water outlet.

[0011] Preferably, the reaction tank is further provided with a backwash water inlet for inputting a backwash medium and a backwash water outlet for outputting the backwash medium;

[0012] Preferably, in the height direction along the reaction tank, the position of the backwash water inlet is higher than the position of the backwash water outlet.

[0013] Preferably, the pretreatment system further comprises a pressure detection device for detecting the pressure in the reaction tank;

[0014] Preferably, the pressure detection device is arranged on the top of the reaction tank.

[0015] Preferably, the decolorization reactor comprises a first inclined processing part and a second inclined processing part, and the bottoms of the first inclined processing part and the second inclined processing part are connected;

[0016] Preferably, an adsorbent is disposed in the first tilting processing part and the second tilting processing part;

[0017] Preferably, the adsorbent comprises a resin-based D407 adsorbent.

[0018] Preferably, the decolorization reactor is provided with a water inlet and a water outlet, the water inlet is provided at the top end of the first inclined processing portion, and the water outlet is provided at the top end of the second inclined processing portion.

[0019] Preferably, one or more mud bins for sewage discharge are independently arranged on the outer side of the first inclined processing part and the outer side of the second inclined processing part;

[0020] Preferably, the mud bin is provided at the connection between the first tilting processing part and the second tilting processing part;

[0021] Preferably, a partition net is provided between the mud bin and the first tilting processing part, and between the mud bin and the second tilting processing part;

[0022] Preferably, the mud bin is provided with a mud discharge valve.

[0023] Preferably, the angle between the first inclined processing portion and the second inclined processing portion is 60 degrees to 90 degrees.

[0024] The present application also provides a method for treating wastewater using the wastewater treatment equipment, comprising:

[0025] The wastewater is input into the pretreatment system for a first treatment, and then input into the decolorization system for a second treatment;

[0026] Preferably, the first treatment time is 0.5-1h;

[0027] Preferably, the filtration rate of the second treatment is 4-6 m / h.

[0028] Compared with the prior art, the beneficial effects of this application include:

[0029] The wastewater treatment equipment and the method for treating wastewater using the same provided by the present application remove particulate matter in the wastewater by using a pretreatment system and fillers arranged therein, decolorize the wastewater from the pretreatment system by a decolorization system, remove the color in the denitrification wastewater, and have no residual chemicals. At the same time, the problem of equipment blockage can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0031] Figure 1 This is a schematic diagram of the structure of the wastewater treatment equipment provided in Example 1.

[0032] Reference numerals:

[0033] 1-water inlet; 2-reaction tank; 3-filler; 4-water outlet; 5-backwash water inlet; 6-backwash water outlet; 7-pressure detection device; 8-first tilting treatment part; 9-second tilting treatment part; 10-water inlet; 11-drain outlet; 12-adsorbent; 13-mud bin; 14-partition screen; 15-mud discharge valve. DETAILED DESCRIPTION

[0034] As used herein:

[0035] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0036] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0037] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0038] In these examples, parts and percentages are by mass unless otherwise indicated.

[0039] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.

[0040] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0041] A wastewater treatment plant comprising a pretreatment system for removing particulate matter and a decolorization system for decolorizing wastewater from the pretreatment system;

[0042] The pretreatment system comprises a reaction tank, wherein a filler is arranged in the reaction tank;

[0043] The decolorization system comprises a decolorization reactor, and the decolorization reactor is V-shaped as a whole.

[0044] In an optional embodiment, the filler comprises quartz sand.

[0045] In an optional embodiment, the reaction tank is provided with a water inlet and a water outlet;

[0046] In an optional embodiment, in the height direction along the reaction tank, the position of the water inlet is higher than the position of the water outlet.

[0047] In an optional embodiment, the reaction tank is further provided with a backwash water inlet for inputting a backwash medium and a backwash water outlet for outputting the backwash medium;

[0048] In an optional embodiment, in the height direction along the reaction tank, the position of the backwash water inlet is higher than the position of the backwash water outlet.

[0049] In an optional embodiment, the pretreatment system further comprises a pressure detection device for detecting the pressure in the reaction tank;

[0050] In an optional embodiment, the pressure detection device is arranged on the top of the reaction tank.

[0051] In an optional embodiment, the decolorization reactor comprises a first inclined processing part and a second inclined processing part, and the bottoms of the first inclined processing part and the second inclined processing part are connected;

[0052] In an optional embodiment, an adsorbent is disposed in the first tilting processing part and the second tilting processing part;

[0053] In an optional embodiment, the adsorbent includes a resin-based D407 adsorbent.

[0054] In an optional embodiment, the decolorization reactor is provided with a water inlet and a drain outlet, the water inlet is provided at the top end of the first inclined processing portion, and the drain outlet is provided at the top end of the second inclined processing portion.

[0055] In an optional embodiment, one or more mud bins for sewage discharge are independently arranged on the outer side of the first inclined processing part and the outer side of the second inclined processing part;

[0056] In an optional embodiment, the mud bin is provided at the connection between the first tilting processing part and the second tilting processing part;

[0057] In an optional embodiment, a partition net is provided between the mud bin and the first tilting processing part, and between the mud bin and the second tilting processing part;

[0058] In an optional embodiment, the mud bin is provided with a mud discharge valve.

[0059] In an optional embodiment, an angle between the first inclined processing portion and the second inclined processing portion is 60 degrees to 90 degrees.

[0060] Optionally, the angle between the first tilt processing portion and the second tilt processing portion may be 60 degrees, 70 degrees, 80 degrees, 90 degrees or any value between 60 degrees and 90 degrees.

[0061] The present application also provides a method for treating wastewater using the wastewater treatment equipment, comprising:

[0062] The wastewater is input into the pretreatment system for a first treatment, and then input into the decolorization system for a second treatment;

[0063] In an optional embodiment, the first treatment time is 0.5-1h;

[0064] In an optional embodiment, the filtration rate of the second treatment is 4-6 m / h.

[0065] Optionally, the time of the first treatment can be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h or any value between 0.5-1h; the filtration rate of the second treatment can be 4m / h, 4.5m / h, 5m / h, 5.5m / h, 6m / h or any value between 4-6m / h.

[0066] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0067] Example 1

[0068] like Figure 1 As shown, this embodiment provides a wastewater treatment device, including a pretreatment system for removing particulate matter ( Figure 1 Left part) and a decolorization system for decolorizing wastewater from the pretreatment system ( Figure 1 right part).

[0069] The main function of the pretreatment system is to remove large suspended particles in the wastewater, including a water inlet 1, a reaction tank 2, a filler 3, and a water outlet 4.

[0070] The filler 3 is arranged inside the reaction tank 2, and preferably quartz sand is used.

[0071] In other optional embodiments, the filler 3 may also be made of other materials suitable for filtering and adsorbing fine particle pollutants, or quartz sand may be mixed with other optional materials or arranged in sequence.

[0072] In order to obtain a better treatment effect, in a preferred embodiment, the water inlet 1 is arranged at the upper part of one side of the reaction tank 2, and the water outlet 4 is arranged at the lower part of the other side of the reaction tank 2 relative to the water inlet 1, so that a height difference is formed between the water inlet 1 and the water outlet 4, and the wastewater obtains a longer treatment process in the reaction tank 2.

[0073] In order to extend the service life of the filler in the pretreatment system, in an optional embodiment, the reaction tank 2 is further provided with a backwash water inlet 5 and a backwash water outlet 6 .

[0074] In order to obtain a better backwash effect, in a preferred embodiment, the backwash water inlet 5 is arranged at the upper part of one side of the water outlet 4, and the backwash water outlet 6 is arranged at the lower part of one side of the water inlet 1, so that the backwash medium flow and the wastewater flow are reversed and crossed, thereby maximizing the backwash effect.

[0075] In order to improve the stability of the pretreatment system and monitor its treatment status, in a preferred embodiment, the pretreatment system further includes a pressure detection device 7.

[0076] It is understandable that the pressure detection device 7 may include components such as a pressure gauge and its ancillary facilities.

[0077] In order to facilitate data reading and ensure data accuracy to the greatest extent possible, in a preferred embodiment, the pressure detection device 7 is disposed on the top of the reaction tank 2 .

[0078] See also Figure 1 ,The function of the decolorization system is to remove the color of the denitrification wastewater by the adsorbent method, including a decolorization reactor.

[0079] The decolorization reactor comprises a first inclined treatment part 8, a second inclined treatment part 9, a water inlet 10 and a drain outlet 11. The bottoms of the first inclined treatment part 8 and the second inclined treatment part 9 are connected, so that the decolorization reactor is "V"-shaped as a whole.

[0080] The angle A between the first inclined portion 8 and the second inclined portion 9 is 60 degrees.

[0081] In other embodiments, the angle between the first inclined portion 8 and the second inclined portion 9 can be freely selected, for example, any value between 60 degrees and 90 degrees.

[0082] The first inclined processing part 8 and the second inclined processing part 9 are adsorption columns filled with an adsorbent 12 .

[0083] In a preferred embodiment, the adsorbent 12 uses a resin-based D407 material to selectively adsorb chromatic groups in wastewater. In this embodiment, the resin-based D407 material is purchased from Jiangsu Suqing Water Treatment Engineering Group Co., Ltd.

[0084] Optionally, in other embodiments, an adsorbent having properties similar to those of the resin-based D407 material may be used.

[0085] In a preferred embodiment, the water inlet 10 is arranged at the top of the first inclined treatment part 8 and is connected to the water outlet 4 of the decolorization system. The drain outlet 11 is arranged at the top of the second inclined treatment part 9 for discharging the treated water.

[0086] In a preferred embodiment, in order to effectively solve the problem of clogging of the adsorption column caused by fine particulate pollutants present in the wastewater and separate the fine particulate pollutants, mud dischargers are provided on the outside of the first inclined treatment part 8, the outside of the second inclined treatment part 9, and the outside of the connection between the first inclined treatment part 8 and the second inclined treatment part 9.

[0087] In a preferred embodiment, the mud discharger includes a mud bin 13 for storing and discharging fine particulate pollutants, a partition 14 disposed between the mud bin 13 and the decolorization reactor, and a mud discharge valve 15 disposed at the outlet of the mud bin 13 .

[0088] Example 2

[0089] This embodiment provides a method for treating wastewater using the wastewater treatment equipment provided in Embodiment 1, which specifically includes the following steps:

[0090] The denitrification wastewater from a lead and zinc smelter is sent to the reaction tank 2 through the water inlet 1. After being treated by the filler 3, large particles such as smoke and dust in the wastewater are filtered, intercepted and removed by the filler, and finally output from the water outlet 4 and further input into the decolorization reactor through the water inlet 10. After being adsorbed by the adsorbent 12 outside the first inclined treatment part 8 and inside the second inclined treatment part 9, it is output from the drain outlet 11.

[0091] During the treatment process, the pressure of the pretreatment system is detected by the pressure detection device 7.

[0092] When the processing capacity of the pretreatment system decreases significantly or reaches the standard for cleaning, the backwash medium is input through the backwash water inlet 5 on the reaction tank 2 to backwash the filler 3, and the backwash medium is output through the backwash water outlet 6.

[0093] During the treatment process in the decolorization reactor, fine particle pollutants enter the mud bin 13 after passing through the screen 14, and are discharged from the decolorization reactor through the mud discharge valve 15 according to the mud discharge setting rules.

[0094] Taking the denitrification wastewater input at water inlet 1 with suspended solids of 120 mg / L and chromaticity of 850 times as an example, the processing time of the pretreatment system can be set to 30 minutes, and the decolorization system inlet filtration rate can be 5 m / h.

[0095] After treatment by this system, the suspended solids in the effluent were 14mg / L and the chromaticity was 24 times, meeting the discharge standard requirements. The decolorization system ran stably for 500 hours without blockage or water volume reduction, and mud was discharged twice during operation.

[0096] The wastewater treatment equipment provided by this application has the following advantages:

[0097] (1) The color in the denitrification wastewater is removed by adsorption without any residual reagents;

[0098] (2) The difference between this wastewater treatment equipment and conventional adsorption columns is that it adopts a V-shaped design and adds several mud buckets, which can effectively solve the blockage of the adsorption column caused by fine particle pollutants in the wastewater.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0100] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A wastewater treatment equipment, characterized in that: including a pretreatment system for removing particulate matter and a decolorization system for decolorizing wastewater from the pretreatment system; The pretreatment system comprises a reaction pool, wherein a filler is arranged in the reaction pool; the reaction pool is provided with a water inlet and a water outlet; in the height direction along the reaction pool, the position of the water inlet is higher than the position of the water outlet; The decolorization system comprises a decolorization reactor, and the decolorization reactor is V-shaped as a whole; The decolorization reactor comprises a first inclined processing part and a second inclined processing part, the bottoms of the first inclined processing part and the second inclined processing part are connected; an adsorbent is arranged in the first inclined processing part and the second inclined processing part; the adsorbent comprises a resin-based D407 adsorbent; The decolorization reactor is provided with a water inlet and a drain outlet, the water inlet is arranged at the top of the first inclined processing part, and the drain outlet is arranged at the top of the second inclined processing part; The outer side of the first inclined processing part and the outer side of the second inclined processing part are each independently provided with a plurality of mud bins for sewage discharge; the mud bin is provided at the connection between the first inclined processing part and the second inclined processing part; a partition net is provided between the mud bin and the first inclined processing part and between the mud bin and the second inclined processing part; the mud bin is provided with a mud discharge valve.

2. The wastewater treatment equipment according to claim 1, characterized in that: The filler includes quartz sand.

3. The wastewater treatment equipment according to claim 1, characterized in that: The reaction tank is also provided with a backwash water inlet for inputting a backwash medium and a backwash water outlet for outputting the backwash medium.

4. The wastewater treatment equipment according to claim 3, characterized in that: In the height direction along the reaction tank, the backwash water inlet is located higher than the backwash water outlet.

5. The wastewater treatment equipment according to any one of claims 1 to 4, characterized in that: The pretreatment system also includes a pressure detection device for detecting the pressure in the reaction tank.

6. The wastewater treatment equipment according to claim 5, characterized in that: The pressure detection device is arranged on the top of the reaction tank.

7. The wastewater treatment equipment according to claim 1, characterized in that: An included angle between the first inclined portion and the second inclined portion is 60 degrees to 90 degrees.

8. A method for treating wastewater using the wastewater treatment equipment according to any one of claims 1 to 7, characterized in that: include: The wastewater is input into the pretreatment system for a first treatment and then input into the decolorization system for a second treatment.

9. The method according to claim 8, characterized in that The time of the first treatment is 0.5-1h.

10. The method according to claim 8, characterized in that The filtration rate of the second treatment is 4-6 m / h.

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