Cooperative control system for residual aluminum and chlorine disinfection by-products in water

Abstract

The utility model relates to a cooperative control system for residual aluminum and chlorine disinfection byproducts in water. The control system comprises a pipeline unit, a sedimentation tank, a filter tank, a disinfection tank, a detection unit and an adding unit, the pipeline unit comprises a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a sixth pipeline and a three-way pipeline; the detection unit comprises a first on-line pH instrument and an on-line aluminum ion detector, the detection end of the first on-line pH instrument and the detection end of the on-line aluminum ion detector are inserted into the first pipeline and the fourth pipeline in a one-to-one correspondence manner; the adding unit comprises a carbon dioxide adding system, a coagulant adding system and a sodium hypochlorite adding system, and a discharge outlet of the carbon dioxide adding system is communicated with the other end of the fifth pipeline. According to the utility model, complicated raw water quality can be dealt with through the carbon dioxide adding system, and the cooperative control of residual aluminum and chlorine disinfection by-products is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field, concretely relates to a kind of synergic control system of residual aluminum and chlorine disinfection by-product in water. BACKGROUND

[0002] Current waterworks adopts pre-oxidation-coagulation-sedimentation-filtration-disinfection process etc..Pre-oxidation is mostly sodium hypochlorite pre-oxidant pre-oxidation mode, coagulation is mostly polyaluminum chloride coagulant, disinfection mostly adds sodium hypochlorite pre-oxidant for disinfection.When algae outbreak in summer, to effectively kill algae before coagulation, sodium hypochlorite pre-oxidant dosage will be increased, sodium hypochlorite is easy to react with carbon-containing organic matter in water to generate chlorine disinfection by-product, while algae outbreak will cause organic matter and pH in water to rise, according to investigation, when pH rises to 8 or more, sodium hypochlorite exists in the form of hypochlorite, oxidation and disinfection capacity decline, polyaluminum chloride exists in the form of dissolved metavanadate, which also affects the coagulation effect of coagulant, and increases the dosage of polyaluminum chloride coagulant.

[0003] However, the above-mentioned mode still has the following problems in actual treatment process:

[0004] 1、When water quality is high in summer, coagulation condition is poor, sodium hypochlorite pre-oxidation and disinfection capacity decline, polyaluminum chloride coagulant, sodium hypochlorite pre-oxidant and disinfectant dosage is large, residual aluminum and chlorine disinfection by-product in effluent water are prone to exceed the standard.

[0005] 2, disinfectant adding point is single, only after filtration, disinfectant dosage is large, which is prone to cause the phenomenon of by-product increase, and filter tank is easy to grow biological membrane, algae and bacteria and other harmful organisms as precursors of disinfection by-products, which also increases the concentration of chlorine disinfection by-products in disinfection process. INVENTION CONTENTS

[0006] Based on the above description, the utility model provides a kind of synergic control system of residual aluminum and chlorine disinfection by-product in water, to solve the problem of poor effluent water quality of existing water treatment process.

[0007] The technical solution of the utility model to solve the above technical problem is as follows:

[0008] A kind of synergic control system of residual aluminum and chlorine disinfection by-product in water, the processing system includes pipeline unit, sedimentation tank, filter tank, disinfection tank, detection unit and adding unit;

[0009] The pipeline unit comprises a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a sixth pipeline and a three-way pipeline, one end of the first pipeline is communicated with a water inlet of the sedimentation tank, two ends of the second pipeline are one by one communicated with a water outlet of the sedimentation tank and a water inlet of the filter tank, two ends of the third pipeline are one by one communicated with a drain pipe of the filter tank and a water inlet of the disinfection tank, one end of the fourth pipeline is communicated with a water outlet of the disinfection tank, one end of the fifth pipeline is communicated with the first pipeline, one end of the sixth pipeline is inserted into the sedimentation tank, and two output ends of the three-way pipeline are one by one communicated with the first pipeline and the third pipeline.

[0010] The detection unit comprises a first online pH instrument and an online aluminum ion detection instrument, and the detection end of the first online pH instrument and the detection end of the online aluminum ion detection instrument are one by one inserted into the first pipeline and the fourth pipeline.

[0011] The adding unit comprises a carbon dioxide adding system, a coagulant adding system and a sodium hypochlorite adding system, the discharge port of the carbon dioxide adding system is communicated with the other end of the fifth pipeline, the discharge port of the coagulant adding system is communicated with the other end of the sixth pipeline, and the discharge port of the sodium hypochlorite adding system is communicated with the input end of the three-way pipeline.

[0012] On the basis of the above technical scheme, the utility model further can make improvement as follows.

[0013] Further, the detection unit comprises a second online pH instrument, and the detection end of the second online pH instrument is inserted into the fourth pipeline.

[0014] Further, the pipeline unit comprises a seventh pipeline, one end of the seventh pipeline is communicated with the first pipeline, and the adding unit comprises a powdered carbon adding system, and the discharge port of the powdered carbon adding system is communicated with the other end of the seventh pipeline.

[0015] Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

[0016] (1) The carbon dioxide adding system can cope with complex raw water quality, and realize the synergistic control of residual aluminum and disinfection by-products.

[0017] (2) When the algae in raw water reaches more than 100 million levels, the powdered carbon adding system can add a certain amount of adsorbent for disinfection by-product precursors, so as to ensure safe water supply. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1The utility model discloses a kind of residual aluminum and chlorine disinfection by-product's synergic control system of structure diagram provided in the embodiment of the utility model in water.

[0019] Marked with reference numerals:

[0020] 1, pipeline unit;11, first pipeline;12, second pipeline;13, third pipeline;14, fourth pipeline;15, fifth pipeline;16, sixth pipeline;17, three-way pipeline;18, seventh pipeline;

[0021] 2, sedimentation tank;

[0022] 3, filter tank;

[0023] 4, disinfection tank;

[0024] 5, detection unit;51, first online pH instrument;52, online aluminum ion detector;53, second online pH instrument;

[0025] 6, dosing unit;61, carbon dioxide dosing system;62, coagulant dosing system;63, sodium hypochlorite dosing system;64, powdered carbon dosing system. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0028] It can be understood that spatial relationship terms, such as "under", "below", "lower", "underneath", "on", "upper", etc., can be used herein to describe the relationship of one element or feature to another element or feature as shown in the figures. It should be understood that, in addition to the orientation shown in the figures, the spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the figure is turned over, the element or feature described as "below" or "under" or "under" the other element will be oriented "on" the other element or feature. Therefore, the exemplary terms "below" and "under" can include both the upper and lower orientations. In addition, the device can also include another orientation (such as 90 degrees or other orientations), and the spatial description used herein is interpreted accordingly.

[0029] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", or the like, when used in this specification, specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0030] Referring to Figure 1 The utility model provides a technical scheme: a kind of synergic control system of residual aluminum and chlorine disinfection by-product in water, processing system includes pipeline unit 1, sedimentation tank 2, filter 3, disinfection tank 4, detection unit 5 and dosing unit 6;Pipeline unit 1 includes first pipeline 11, second pipeline 12, third pipeline 13, fourth pipeline 14, fifth pipeline 15, sixth pipeline 16 and three-way pipeline 17, one end of first pipeline 11 is communicated with the water inlet of sedimentation tank 2;Two ends of second pipeline 12 are one-to-one correspondence communicated with the water outlet of sedimentation tank 2 and the water inlet of filter 3, two ends of third pipeline 13 are one-to-one correspondence communicated with the drain pipe of filter 3 and the water inlet of disinfection tank 4, one end of fourth pipeline 14 is communicated with the water outlet of disinfection tank 4, one end of fifth pipeline 15 is communicated with first pipeline 11, one end of sixth pipeline 16 is inserted into sedimentation tank 2, two output ends of three-way pipeline 17 are one-to-one correspondence communicated with first pipeline 11 and third pipeline 13;Detection unit 5 includes first online pH instrument 51 and online aluminum ion detector 52, the detection end of first online pH instrument 51 and the detection end of online aluminum ion detector 52 are one-to-one correspondence inserted into first pipeline 11 and fourth pipeline 14;Dosing unit 6 includes carbon dioxide dosing system 61, coagulant dosing system 62 and sodium hypochlorite dosing system 63, the discharge port of carbon dioxide dosing system 61 is communicated with the other end of fifth pipeline 15, the discharge port of coagulant dosing system 62 is communicated with the other end of sixth pipeline 16, the discharge port of sodium hypochlorite dosing system 63 is communicated with the input end of three-way pipeline 17.

[0031] In the embodiment, in the process of delivering raw water to sedimentation tank 2, first online pH instrument 51 measures the pH value of raw water, and online aluminum ion detector 52 measures the residual aluminum concentration of finished water. When the pH value is higher than the first preset threshold value and the user-input permanganate index is lower than the second preset threshold value, or the residual aluminum concentration is higher than the third preset threshold value and the user-input chloroform is higher than the fourth preset threshold value, the following process can be taken to treat raw water:

[0032] Dosing carbon dioxide-first dosing sodium hypochlorite pre-oxidant-dosing polyaluminum chloride coagulant-coagulation sedimentation-filtration-second dosing sodium hypochlorite pre-oxidant-disinfection.

[0033] For example, in summer, the pH value of the raw water at a certain lake / reservoir water source plant rises to 8.3-8.5, the algae content is in the tens of millions, the dosage of sodium hypochlorite pre-oxidant is 1.5 mg / L, the dosage of polyaluminum chloride coagulant is 2 mg / L (available aluminum), the residual aluminum concentration in the treated water is about 0.18 mg / L, the turbidity of the treated water is 0.7 NTU, and the chloroform content is about 0.05 mg / L. There is a risk of exceeding the standards for residual aluminum and disinfection byproduct chloroform.

[0034] By adopting the above-mentioned raw water treatment process and starting the carbon dioxide dosing system 61, the pH value of the effluent was controlled at 7.3. The first dosing of sodium hypochlorite pre-oxidant was 1.0 mg / L, the dosing of polyaluminum chloride coagulant was 1.6 mg / L, and the second dosing of sodium hypochlorite pre-oxidant was 1.5 mg / L. The residual aluminum concentration in the effluent was 0.12 mg / L, the turbidity was reduced to 0.4 NTU, and the trichloromethane concentration was 0.03~0.04 mg / L. The effluent quality was well controlled.

[0035] Reference Figure 1 As shown, in some embodiments, the detection unit 5 includes a second online pH meter 53, the detection end of which is inserted into the fourth pipe 14.

[0036] In this embodiment, when the disinfection tank 4 discharges water, the second online pH meter 53 measures the pH value of the effluent to monitor the quality of the effluent.

[0037] Reference Figure 1 As shown, in some embodiments, the pipeline unit 1 includes a seventh pipeline 18, one end of which is connected to the first pipeline 11, and the dosing unit 6 includes a powdered carbon dosing system 64, the discharge port of which is connected to the other end of the seventh pipeline 18.

[0038] In this embodiment, during the process of supplying raw water to sedimentation tank 2, when the pH value is higher than the first preset threshold and the permanganate index is higher than the second preset threshold, or the residual aluminum concentration is higher than the third preset threshold and the chloroform concentration input by the user is higher than the fourth preset threshold, the raw water can be treated using the following process:

[0039] Add powdered activated carbon—add carbon dioxide—first addition of sodium hypochlorite pre-oxidant—add polyaluminum chloride coagulant—coagulation and sedimentation—filtration—second addition of sodium hypochlorite pre-oxidant—disinfection.

[0040] For example, the pH value of raw water of a certain lake and reservoir water source water plant rises to above 8.6 in summer, the algae content is in the order of 100 million, the dosage of sodium hypochlorite pre-oxidant is 2.5 mg / L, the dosage of polyaluminum chloride coagulant is 1.2 mg / L (effective aluminum), the residual aluminum concentration of finished water is about 0.19 mg / L, the turbidity of finished water is 0.5 NTU, the content of chloroform is about 0.05 mg / L, and the residual aluminum and disinfection by-product chloroform have the risk of exceeding the standard.

[0041] By adopting the above raw water treatment process, the dosage of powdered carbon in the first pipeline 11 is 10 mg / L, carbon dioxide is added at the same time to control the pH value of effluent water at 7.2, the first dosage of sodium hypochlorite pre-oxidant is reduced to 1.0 mg / L, the dosage of polyaluminum chloride coagulant is 1.2 mg / L, the second dosage of sodium hypochlorite pre-oxidant is 1.5 mg / L, the residual aluminum concentration of finished water is 0.10 mg / L, the turbidity is reduced to 0.3 NTU, the content of chloroform is 0.03 mg / L, and the residual aluminum and chloro-disinfection by-product of effluent water are well controlled.

[0042] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A system for the synergistic control of residual aluminum and chlorinated disinfection byproducts in water, characterized in that, The application relates to a water purification device, which comprises a pipeline unit (1), a sedimentation tank (2), a filter tank (3), a disinfection tank (4), a detection unit (5) and a dosing unit (6). The pipeline unit (1) comprises a first pipeline (11), a second pipeline (12), a third pipeline (13), a fourth pipeline (14), a fifth pipeline (15), a sixth pipeline (16) and a three-way pipeline (17), one end of the first pipeline (11) is communicated with a water inlet of the sedimentation tank (2), two ends of the second pipeline (12) are one by one communicated with a water outlet of the sedimentation tank (2) and a water inlet of the filter tank (3), two ends of the third pipeline (13) are one by one communicated with a drain pipe of the filter tank (3) and a water inlet of the disinfection tank (4), one end of the fourth pipeline (14) is communicated with a water outlet of the disinfection tank (4), one end of the fifth pipeline (15) is communicated with the first pipeline (11), one end of the sixth pipeline (16) is inserted into the sedimentation tank (2), and two output ends of the three-way pipeline (17) are one by one communicated with the first pipeline (11) and the third pipeline (13). The detection unit (5) comprises a first online pH instrument (51) and an online aluminum ion detection instrument (52), and the detection end of the first online pH instrument (51) and the detection end of the online aluminum ion detection instrument (52) are one by one inserted into the first pipeline (11) and the fourth pipeline (14). The dosing unit (6) comprises a carbon dioxide dosing system (61), a coagulant dosing system (62) and a sodium hypochlorite dosing system (63), the discharge port of the carbon dioxide dosing system (61) is communicated with the other end of the fifth pipeline (15), the discharge port of the coagulant dosing system (62) is communicated with the other end of the sixth pipeline (16), and the discharge port of the sodium hypochlorite dosing system (63) is communicated with the input end of the three-way pipeline (17).

2. A system for the synergistic control of residual aluminum and chlorine disinfection by-products in water according to claim 1, wherein, The detection unit (5) comprises a second online pH instrument (53), and the detection end of the second online pH instrument (53) is inserted into the fourth pipeline (14).

3. A system for the synergistic control of residual aluminum and chlorine disinfection by-products in water according to claim 1, wherein, The pipeline unit (1) comprises a seventh pipeline (18), one end of the seventh pipeline (18) is communicated with the first pipeline (11), the dosing unit (6) comprises a powdered carbon dosing system (64), and the discharge port of the powdered carbon dosing system (64) is communicated with the other end of the seventh pipeline (18).

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