Advanced treatment system for antimony-containing wastewater

Abstract

The utility model discloses an advanced treatment system for antimony-containing wastewater, which comprises a primary sedimentation tank, a secondary sedimentation tank, a secondary sedimentation tank and a secondary sedimentation tank, the primary sedimentation tank is used for carrying out primary sedimentation on high-concentration antimony-containing wastewater, and the high-concentration antimony-containing wastewater comprises ultrasonic wastewater, flushing wastewater, boiling wastewater and hydrolysis wastewater; the first flocculating agent adding box is arranged above the primary sedimentation tank and is used for adding a flocculating agent into the primary sedimentation tank through self weight; the liquid caustic soda adding box is arranged above the primary sedimentation tank and is used for adding caustic soda into the primary sedimentation tank through self weight; the second-stage sedimentation tank is arranged at the downstream of the first-stage sedimentation tank and is used for carrying out second-stage sedimentation on the first-stage sedimentation wastewater and carrying out sedimentation on low-concentration antimony-containing wastewater; the second flocculating agent adding box is arranged above the secondary sedimentation tank and is used for adding a flocculating agent into the secondary sedimentation tank through self weight; sludge generated by the secondary sedimentation tank enters a sludge tank, generated supernate is subjected to COD (Chemical Oxygen Demand) data detection, if the supernate reaches the standard, the supernate enters a polyester wastewater tank, otherwise, the supernate enters the sedimentation tank for continuous biochemical treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a deep treatment system for antimony-containing wastewater. Background Art

[0002] Antimony-containing catalysts are used in the production of polyester chips, which results in the generation of a large amount of antimony-containing wastewater. This mainly includes ultrasonic wastewater, flushing wastewater, boiling wastewater and hydrolysis wastewater with relatively high antimony content, as well as polyester chip cooling wastewater with relatively low antimony content.

[0003] At present, the main treatment method for antimony-containing wastewater is to add flocculants in the sedimentation tank to precipitate antimony ions and achieve the removal effect. However, the existing treatment technology is not very effective in removing antimony. By testing the antimony ion concentration of the wastewater after precipitation in the existing process, its content is generally around 0.8 to 1.0 ppm. Utility Model Content

[0004] The purpose of the utility model is to design a deep treatment system for antimony-containing wastewater to achieve the effect of deep antimony removal from antimony-containing wastewater in view of the problem that the existing antimony-containing wastewater treatment method has unsatisfactory antimony removal effect.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0006] The utility model designs a system for deep treatment of antimony-containing wastewater, which includes:

[0007] A primary sedimentation tank for primary precipitation of high-concentration antimony-containing wastewater, wherein the high-concentration antimony-containing wastewater includes ultrasonic wastewater, flushing wastewater, boiling wastewater and hydrolysis wastewater generated during the production of polyester chips;

[0008] a first flocculant dosing tank, which is arranged above the primary sedimentation tank and is used to add flocculant into the primary sedimentation tank by its own weight;

[0009] a liquid alkali dosing tank, which is arranged above the primary sedimentation tank and is used to add alkali into the primary sedimentation tank by its own weight;

[0010] a secondary sedimentation tank disposed downstream of the primary sedimentation tank, for performing secondary sedimentation on the primary sedimentation wastewater pumped from the primary sedimentation tank into the secondary sedimentation tank and for precipitating low-concentration antimony-containing wastewater, wherein the low-concentration antimony-containing wastewater includes polyester chip cooling wastewater;

[0011] and a second flocculant dosing tank, which is arranged above the secondary sedimentation tank and is used to add flocculant into the secondary sedimentation tank by its own weight;

[0012] Among them, the sludge produced after sedimentation in the secondary sedimentation tank enters the sludge tank. The supernatant produced after sedimentation in the secondary sedimentation tank is tested by COD data. If it meets the standards, it will enter the polyester wastewater pool. If it does not meet the standards, it will enter the sedimentation tank to continue the next step of biochemical treatment.

[0013] Furthermore, a system for deep treatment of antimony-containing wastewater: a first dosing valve is provided between the first flocculant dosing tank and the primary sedimentation tank.

[0014] Furthermore, a deep treatment system for antimony-containing wastewater is provided: a second dosing valve is provided between the liquid alkali dosing tank and the primary sedimentation tank.

[0015] Furthermore, in a deep treatment system for antimony-containing wastewater, a third dosing valve is provided between the second flocculant dosing tank and the secondary sedimentation tank.

[0016] Furthermore, a deep treatment system for antimony-containing wastewater is provided: the deep treatment system also includes a first aeration system arranged on the primary sedimentation tank, for fully aerating and mixing the reagent and the wastewater.

[0017] Furthermore, a system for deep treatment of antimony-containing wastewater: the first aeration system includes a first circulation pump and a first static mixer.

[0018] Furthermore, a deep treatment system for antimony-containing wastewater is provided: the deep treatment system also includes a second aeration system arranged on the secondary sedimentation tank, which is used to fully aerate and mix the reagent and the wastewater.

[0019] Furthermore, a system for deep treatment of antimony-containing wastewater: the second aeration system includes a second circulation pump and a second static mixer.

[0020] Furthermore, a deep treatment system for antimony-containing wastewater is provided: the deep treatment system also includes a chip cooling wastewater collection tank connected to the secondary sedimentation tank; according to the amount of polyester chip cooling wastewater, it is selected to enter the secondary sedimentation tank and / or the chip cooling wastewater collection tank.

[0021] Specifically, if the amount of polyester chip cooling wastewater is small, it can be directly sent to the secondary sedimentation tank for treatment. If the amount of polyester chip cooling wastewater is large, the polyester chip cooling wastewater can be divided into two routes, one route directly enters the secondary sedimentation tank, and the other route enters the chip cooling wastewater collection tank for temporary storage. After the wastewater in the secondary sedimentation tank is treated and discharged, part of the polyester chip cooling wastewater is pumped from the chip cooling wastewater collection tank into the secondary sedimentation.

[0022] Furthermore, a deep treatment system for antimony-containing wastewater is provided: a first control valve and a second control valve are respectively provided between the passages of the polyester chip cooling wastewater and the secondary sedimentation tank and the chip cooling wastewater collection tank.

[0023] Specifically, in the antimony-containing wastewater deep treatment system designed in the utility model, a water pump and a valve are provided between the first sedimentation tank and the secondary sedimentation tank, a mud press and a valve are provided between the secondary sedimentation tank and the sludge tank, valves are provided between the secondary sedimentation tank and the polyester wastewater tank and the sedimentation tank, a water pump and a valve are also provided between the slice cooling wastewater collection tank and the secondary sedimentation tank, and valves are also provided in the first and second aeration systems respectively.

[0024] Beneficial effects of the utility model:

[0025] The antimony-containing wastewater deep treatment system designed by the present invention has a simple structure and the reagents can be added to the primary and secondary sedimentation tanks by their own gravity, making the addition of reagents more convenient. More importantly, after the deep treatment of the antimony-containing wastewater by the treatment system of the present application, the wastewater can be discharged in compliance with the standard with an antimony ion concentration of less than 0.4ppm. The antimony ion concentration after antimony removal in the existing process is about 0.8 to 1.0ppm, and its antimony removal effect is far lower than that of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of an antimony-containing wastewater deep treatment system designed for Example 1 of the present utility model.

[0028] Markings in the figure: 1-primary sedimentation tank, 2-first flocculant dosing box, 3-liquid alkali dosing box, 4-secondary sedimentation tank, 5-second flocculant dosing box, 6-sludge tank, 7-polyester wastewater tank, 8-sedimentation tank, 9-first dosing valve, 10-second dosing valve, 11-third dosing valve, 12-first circulation pump, 13-first static mixer, 14-second circulation pump, 15-second static mixer, 16-slice cooling wastewater collection tank, 17-first control valve, 18-second control valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment 1 designs a deep treatment system for antimony-containing wastewater, which includes:

[0033] A primary sedimentation tank 1 is used for primary precipitation of high-concentration antimony-containing wastewater, wherein the high-concentration antimony-containing wastewater includes ultrasonic wastewater, flushing wastewater, boiling wastewater and hydrolysis wastewater generated by the production of polyester chips;

[0034] a first flocculant dosing tank 2, which is arranged above the primary sedimentation tank 1; a first dosing valve 9 is provided between the first flocculant dosing tank 2 and the primary sedimentation tank 1; after the first dosing valve 9 is opened, the flocculant can be added to the primary sedimentation tank 1 by its own weight (the flocculant is added in the primary sedimentation tank 1 at a ratio of 0.1‰);

[0035] a liquid alkali dosing tank 3, which is arranged above the primary sedimentation tank 1; a second dosing valve 10 is provided between the liquid alkali dosing tank 3 and the primary sedimentation tank 1; after the second dosing valve 10 is opened, alkali liquid is automatically added to the primary sedimentation tank 1 by its own weight; the pH value of the wastewater in the primary sedimentation tank 1 is adjusted to 6-7 by the alkali liquid; and a first aeration system for fully aerating and mixing the added agent with the wastewater is further provided on the primary sedimentation tank 1, which includes a first circulation pump 12 and a first static mixer 13;

[0036] The secondary sedimentation tank 4 is arranged downstream of the primary sedimentation tank 1 and is used to perform secondary sedimentation on the primary sedimentation wastewater pumped from the primary sedimentation tank 1 into the secondary sedimentation tank 4, and is used to precipitate low-concentration antimony-containing wastewater (polyester chip cooling wastewater). Since the antimony ion content of the polyester chip cooling wastewater is low, a single precipitation is sufficient;

[0037] A second flocculant dosing tank 5 is provided above the secondary sedimentation tank 4. A third dosing valve 11 is provided between the second flocculant dosing tank 5 and the secondary sedimentation tank 4. After the third dosing valve 11 is opened, the flocculant is added to the secondary sedimentation tank 4 by its own weight (the flocculant is added in the secondary sedimentation tank 4 at a ratio of 0.6‰). The secondary sedimentation tank 4 is also provided with a second aeration system for fully aerating and mixing the added agent with the wastewater, which includes a second circulation pump 14 and a second static mixer 15.

[0038] and a chip cooling wastewater collection tank 16, which is connected to the secondary sedimentation tank 4 and can be selected to enter the secondary sedimentation tank 4 and / or the chip cooling wastewater collection tank 16 according to the amount of polyester chip cooling wastewater. If the amount of polyester chip cooling wastewater is small, it can be directly entered into the secondary sedimentation tank 4 for treatment. If the amount of polyester chip cooling wastewater is large, the polyester chip cooling wastewater can be divided into two paths, one path directly entering the secondary sedimentation tank 4, and the other path entering the chip cooling wastewater collection tank 16 for temporary storage. After the wastewater in the secondary sedimentation tank 4 is treated and discharged, part of the polyester chip cooling wastewater is pumped from the chip cooling wastewater collection tank 16 into the secondary sedimentation 4. A first control valve 17 and a second control valve 18 are respectively provided between the polyester chip cooling wastewater and the passages between the secondary sedimentation tank 4 and the chip cooling wastewater collection tank 16 to control the flow direction of the polyester chip cooling wastewater;

[0039] Among them, the sludge produced after precipitation in the secondary sedimentation tank 4 enters the sludge tank 6, and the supernatant produced after precipitation in the secondary sedimentation tank 4 enters the polyester wastewater tank 7 after COD data detection. Otherwise, it enters the sedimentation tank 8 to continue biochemical treatment.

[0040] After being treated by the antimony-containing wastewater deep treatment system designed in this embodiment 1, the wastewater can be discharged with an antimony ion concentration lower than 0.4 ppm, and the antimony removal effect is significant.

[0041] The above preferred embodiments of the present invention are only used to explain the present invention and are not intended to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A system for deep treatment of antimony-containing wastewater, characterized in that: The deep processing system includes: A primary sedimentation tank (1) is used for primary precipitation of high-concentration antimony-containing wastewater, wherein the high-concentration antimony-containing wastewater includes ultrasonic wastewater, flushing wastewater, boiling wastewater and hydrolysis wastewater generated in the production of polyester chips; a first flocculant dosing tank (2), which is arranged above the primary sedimentation tank (1) and is used to add flocculant into the primary sedimentation tank (1) by its own weight; a liquid alkali dosing box (3), which is arranged above the primary sedimentation tank (1) and is used to add alkali into the primary sedimentation tank (1) by its own weight; A secondary sedimentation tank (4) is provided downstream of the primary sedimentation tank (1) and is used for performing secondary sedimentation on the primary sedimentation wastewater pumped into the secondary sedimentation tank (4) and for precipitating low-concentration antimony-containing wastewater, wherein the low-concentration antimony-containing wastewater includes polyester chip cooling wastewater; and a second flocculant dosing box (5), which is arranged above the secondary sedimentation tank (4) and is used to add flocculant into the secondary sedimentation tank (4) by its own weight; The sludge generated after the sedimentation in the secondary sedimentation tank (4) enters the sludge tank (6), and the supernatant generated after the sedimentation in the secondary sedimentation tank (4) enters the polyester wastewater tank (7) if it meets the standards after the COD data is detected, otherwise it enters the sedimentation tank (8) to continue biochemical treatment.

2. The antimony-containing wastewater deep treatment system according to claim 1, characterized in that: A first dosing valve (9) is provided between the first flocculant dosing tank (2) and the primary sedimentation tank (1).

3. The antimony-containing wastewater deep treatment system according to claim 1, characterized in that: A second dosing valve (10) is provided between the liquid caustic soda dosing tank (3) and the primary sedimentation tank (1).

4. The antimony-containing wastewater deep treatment system according to claim 1, characterized in that: A third dosing valve (11) is provided between the second flocculant dosing tank (5) and the secondary sedimentation tank (4).

5. The antimony-containing wastewater deep treatment system according to claim 1, characterized in that: The deep treatment system also includes a first aeration system arranged on the primary sedimentation tank (1) for fully aerating and mixing the reagent and the wastewater.

6. The antimony-containing wastewater deep treatment system according to claim 5, characterized in that: The first aeration system includes a first circulation pump (12) and a first static mixer (13).

7. The antimony-containing wastewater deep treatment system according to claim 1, characterized in that: The deep treatment system also includes a second aeration system arranged on the secondary sedimentation tank (4) for fully aerating and mixing the reagent and the wastewater.

8. The antimony-containing wastewater deep treatment system according to claim 7, characterized in that: The second aeration system includes a second circulation pump (14) and a second static mixer (15).

9. The antimony-containing wastewater deep treatment system according to claim 1, characterized in that: The deep treatment system further comprises a slice cooling wastewater collection tank (16) connected to the secondary sedimentation tank (4); According to the amount of polyester chip cooling wastewater, it is selected to enter the secondary sedimentation tank (4) and / or the chip cooling wastewater collection tank (16).

10. The antimony-containing wastewater deep treatment system according to claim 9, characterized in that: A first control valve (17) and a second control valve (18) are respectively provided between the passages between the polyester chip cooling wastewater and the secondary sedimentation tank (4) and the chip cooling wastewater collection tank (16).

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