Intelligent zero-discharge treatment system for coal-containing wastewater

Abstract

The invention relates to the technical field of wastewater treatment, in particular to an intelligent coal-containing wastewater zero-discharge treatment system which comprises an integrated electric flocculation system, a self-circulation treatment zero-discharge process system, a large-capacity coal water treatment pre-sedimentation system, a distributed coal water collection system and a comprehensive application system. Wherein the integrated electric flocculation system comprises an electronic flocculator. According to the coal-containing wastewater treatment method provided by the invention, zero emission of coal-containing wastewater can be realized, the environmental protection benefit is remarkable, the treatment efficiency and effect are improved, the water quality is ensured, and the cost of a sludge treatment system is also saved. Intelligent unattended operation is realized, and the operation cost is reduced. Therefore, the problems in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to an intelligent zero-discharge treatment system for coal-containing wastewater. Background Art

[0002] The treatment of coal-containing wastewater is indeed an important issue in the field of environmental protection. Traditional treatment methods, such as chemical coagulation, electrocoagulation, magnetic coagulation, etc., have some obvious limitations. First, these methods are usually low in treatment efficiency, especially when facing the removal of fine suspended solids in coal-containing wastewater. Secondly, traditional processes have poor adaptability when facing fluctuations in water quality and quantity caused by rainwater, resulting in unstable system operation. In addition, traditional methods often require a lot of manpower and chemicals, which not only increases the cost of treatment, but also may cause secondary pollution. Therefore, with the improvement of environmental protection requirements and the enhancement of awareness of water resource protection, traditional treatment methods can no longer meet the current strict environmental protection standards, and more efficient and environmentally friendly treatment technologies are needed to replace or supplement them. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an intelligent zero-discharge treatment system for coal-containing wastewater, comprising an integrated electric flocculation system, a self-circulating treatment zero-discharge process system, a large-capacity coal-water treatment pre-sedimentation system, a distributed coal-water collection system and a comprehensive utilization system; wherein the integrated electric flocculation system includes an electronic flocculator.

[0005] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, the coal-containing wastewater is lifted by a coal-water lifting pump and passed through an electronic flocculator to form colloidal coal particles in the coal-containing wastewater into large particles; it enters the centrifugal sedimentation reactor tank at high speed and rotates rapidly to generate centrifugal force. After centrifugal separation and gravity separation, the clarified water gathers in the centrifugal sedimentation reactor sump and flows to the intermediate water tank.

[0006] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, clarified water is lifted to the multi-media filter by the intermediate water tank lifting pump for filtration, and the filtered clean water is reused in the reuse water pool; concentrated coal sludge water is discharged from the bottom of the electronic flocculator and the centrifugal precipitator, and flows back to the coal-water regulating tank for sedimentation and stratification; the precipitated coal sludge is cleaned regularly.

[0007] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, the coal-containing wastewater is collected and precipitated nearby through distributed pipelines, subjected to centralized pre-precipitation, filtration and regulation, electro-flocculation treatment, centrifugal sedimentation, and physical filtration.

[0008] As a preferred solution of the intelligent coal-containing wastewater zero-discharge treatment system described in the present invention, two coal-containing wastewater flushing pumps and two backwashing pumps are arranged in the coal-water reuse pool, and the qualified wastewater is pressurized by the coal-containing wastewater flushing pumps and then reused as flushing water for the coal transportation structure site.

[0009] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, the 500-cubic-meter large-capacity pre-sedimentation tank provides a buffer for the concentrated water to ensure the balanced output of the coal-water treatment device and maintain water balance. At the same time, the coal-containing wastewater regulating tank is provided with a lifting pump to the 500-cubic-meter pre-sedimentation tank. After the valve is switched, the pipeline between the 500-cubic-meter pre-sedimentation tank and the coal-containing wastewater regulating tank is used to realize two-way water pumping. When the liquid level of the 500-cubic-meter pre-sedimentation tank is greater than 1.75m, the selected lifting pump is started.

[0010] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, when the liquid level in the 500-cubic-meter pre-sedimentation tank is less than 0.8 m, the coal-water lift pump is shut down, and one pump is used as a standby and the other is automatically switched in case of failure.

[0011] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, the distributed coal-water collection system includes 6 secondary sedimentation and separation coal-water collection pools reasonably arranged by region, and the surrounding sewage automatically flows into the nearest coal-water collection pool through the trench pipe for buffering and sedimentation.

[0012] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, the sewage after sedimentation and stratification is automatically started and stopped by the coal-water lifting pump through liquid level control, and is directly pumped into the pre-sedimentation tank. After sufficient sedimentation, it is pumped into the electric flocculation front-end filtration and regulating tank for centralized treatment, and then pumped into the coal-water reuse clear water tank for standby use.

[0013] As a preferred solution of the intelligent zero-discharge treatment system for coal-containing wastewater described in the present invention, in the clean water reuse link, the outlet pressure of the reuse water pump is tracked according to the increase or decrease of water use occasions to achieve variable frequency constant pressure water supply.

[0014] Beneficial effects of the present invention: The coal-containing wastewater treatment method provided by the present invention can achieve zero discharge of coal-containing wastewater, with significant environmental benefits, improve treatment efficiency and effect, ensure water quality, and save the cost of sludge treatment system. It can achieve intelligent unattended operation and reduce operating costs, thereby solving the problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0016] Figure 1 Schematic diagram of the processing method in the present invention.

[0017] Figure 2 It is a schematic diagram of the processing method of the present invention. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0021] Example 1, reference Figure 1 to Figure 2 , which is the first embodiment of the present invention, and provides an intelligent zero-discharge treatment system for coal-containing wastewater.

[0022] Specifically, an integrated electro-flocculation system, a self-circulating treatment zero-emission process system, a large-capacity coal-water treatment pre-sedimentation system, a distributed coal-water collection system and a comprehensive utilization system are established; among which, the integrated electro-flocculation system includes an electronic flocculator.

[0023] Example 2, reference Figure 1-2 , which is the second embodiment of the present invention, is different from the previous embodiment.

[0024] Specifically, the coal-containing wastewater is lifted by a coal-water lifting pump and passed through an electronic flocculator to form colloidal coal particles in the coal-containing wastewater into large particles; it enters the centrifugal sedimentation reactor tank at high speed, rotates rapidly to generate centrifugal force, and after centrifugal separation and gravity separation, the clarified water gathers in the centrifugal sedimentation tank and flows to the intermediate water tank.

[0025] The flocculation effect is induced by the electric field. No chemicals need to be added, and it demonstrates strong continuous processing capacity and load impact resistance. The coal-containing wastewater is lifted by the coal-water lifting pump and passed through the electronic flocculator, and the colloidal coal particles in the coal-containing wastewater are formed into large particles; it enters the centrifugal sedimentation reactor tank at high speed, and rotates rapidly to generate centrifugal force. After centrifugal separation and gravity separation, the clarified water is gathered in the centrifugal sedimentation tank and flows to the intermediate water tank. The clarified water is lifted by the intermediate water tank lifting pump to the multi-media filter for filtration, and the filtered clear water is reused in the reuse water pool; the concentrated coal sludge water is discharged from the bottom of the electronic flocculator and the centrifugal sedimentation tank, and flows back to the coal-water regulating tank for sedimentation and stratification; the precipitated coal sludge is cleaned regularly. The discharged sludge has a low moisture content and can be directly discharged to the raw coal storage yard and mixed with the raw coal before being sent to the boiler for combustion, eliminating the sludge treatment system.

[0026] The clarified water is lifted by the intermediate water tank lifting pump to the multi-media filter for filtration, and the filtered clean water is reused in the reuse water pool; the concentrated coal sludge water is discharged from the bottom of the electronic flocculator and centrifugal sedimentator, and returned to the coal-water regulating tank for sedimentation and stratification; the precipitated coal sludge is cleaned regularly.

[0027] Coal-containing wastewater is collected and precipitated nearby through distributed pipelines, centralized pre-precipitation, filtration and regulation, electro-flocculation treatment, centrifugal sedimentation, and physical filtration.

[0028] The coal-water reuse pool is equipped with two coal-containing wastewater flushing pumps and two backwashing pumps. The qualified wastewater is pressurized by the coal-containing wastewater flushing pumps and then reused as flushing water for the coal transportation structure site.

[0029] Coal-containing wastewater is collected and precipitated nearby through distributed pipelines, and then filtered and adjusted, electro-flocculated, centrifuged, and physically filtered to achieve the reuse of clean water. According to this process path, self-circulating electro-flocculation treatment is carried out, and the low-turbidity wastewater that meets the emission standards after treatment by the coal-containing wastewater treatment equipment is discharged to the coal-water reuse pool for reuse. Combined with the natural evaporation of ground washing and the dust suppression of coal flow spraying, the goal of zero wastewater discharge is achieved. Two coal-containing wastewater flushing pumps and two backwashing pumps are installed in the coal-water reuse pool. The qualified wastewater is boosted by the coal-containing wastewater flushing pump and reused as flushing water for the coal transportation structure site.

[0030] Make full use of physical sedimentation methods to ensure the natural sedimentation and stratification of coal and water for 24 hours to provide treatment effect guarantee. The 500 cubic meter large-capacity pre-sedimentation tank provides a buffer for the concentrated water to ensure the balanced output of the coal-water treatment device and maintain water balance. At the same time, the coal-containing wastewater regulating tank is equipped with a lifting pump to the 500 cubic meter pre-sedimentation tank. After the valve is switched, the pipeline between the 500 cubic meter pre-sedimentation tank and the coal-containing wastewater regulating tank is used to achieve two-way water pumping. When the liquid level of the 500 cubic meter pre-sedimentation tank is greater than 1.75m, the selected lifting pump is started.

[0031] When the liquid level in the 500 cubic meter pre-sedimentation tank is less than 0.8m, the coal-water lifting pump is shut down, and one pump is used as a backup, which will automatically switch in case of failure.

[0032] The distributed coal-water collection system includes six secondary sedimentation and separation coal-water collection pools that are rationally arranged according to the region. The surrounding sewage automatically flows into the nearest coal-water collection pool through trench pipes for buffering and sedimentation.

[0033] In terms of the coal-water lifting pump, the two pumps can realize hot standby fault switching and parallel operation to ensure large water delivery capacity and prevent sewage overflow. After the selected coal-water regulating tank coal-water lifting pump is started, the electric flocculation water inlet gate is opened, and the outlet flow is greater than 10m 3 / h, start the electronic flocculator; the plate switching time (currently 240min) and the current size (currently 300A) can be adjusted on-site. When the effluent quality is not ideal, the current can be increased. Electric flocculator drain valve: After it is allowed to start, the timing starts with the start of the coal-water lifting pump as the benchmark, accumulating 24h, and draining for 2min. There will be a drain before each start, and the drain time is 1min; in the sewage treatment link, the electric flocculation output can be automatically adjusted according to the effluent turbidity detection value to ensure the water quality of the outlet. Multi-media filter: It can perform artificial forced backwashing and forced backwashing when the time reaches the set value. For example, the filter can be backwashed regularly, the backwash interval is 90min, and the backwashing time of each filter tank is 6min. The time can be adjusted according to the turbidity of the effluent.

[0034] An intelligent monitoring platform is established to introduce the liquid level of each coal-containing wastewater pool, effluent turbidity, equipment operating status, current and other parameters as well as system equipment operation functions into the DCS control system. An intelligent operation platform is built in the operation room to realize centralized monitoring, remote operation, and parameter over-limit and fault alarm functions. Important equipment is equipped with industrial monitoring equipment, which can remotely monitor the equipment status in real time through the screen to ensure intelligent unattended function.

[0035] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0036] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0037] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An intelligent zero-discharge treatment system for coal-containing wastewater, characterized by: include, Establish integrated electric flocculation system, self-circulating treatment zero-discharge process system, large-capacity coal-water treatment pre-sedimentation system, distributed coal-water collection system and comprehensive utilization system respectively; Wherein, the integrated electric flocculation system includes an electronic flocculator.

2. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 1, characterized in that: The coal-containing wastewater is lifted by the coal-water lifting pump and passed through the electronic flocculator, which agglomerates the colloidal coal particles in the coal-containing wastewater into large particles; it enters the centrifugal sedimentation reactor tank at high speed, rotates rapidly to generate centrifugal force, and after centrifugal separation and gravity separation, the clarified water gathers in the centrifugal sedimentation tank and flows to the intermediate water tank.

3. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 2, characterized in that: The clarified water is lifted by the intermediate water tank lifting pump to the multi-media filter for filtration, and the filtered clean water is reused in the reuse water tank; the concentrated coal sludge water is discharged from the bottom of the electronic flocculator and centrifugal sedimentation tank, and flows back to the coal-water regulating tank for sedimentation and stratification; The settled coal sludge should be cleaned regularly.

4. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 3 is characterized in that: Coal-containing wastewater is collected and precipitated nearby through distributed pipelines, centralized pre-precipitation, filtration and adjustment, electro-flocculation treatment, centrifugal sedimentation, and physical filtration.

5. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 4, characterized in that: The coal-water reuse pool is equipped with two coal-containing wastewater flushing pumps and two backwashing pumps. The qualified wastewater is pressurized by the coal-containing wastewater flushing pumps and then reused as flushing water for the coal transportation structure site.

6. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 5, characterized in that: The 500-cubic-meter large-capacity pre-sedimentation tank provides a buffer for the concentrated water, ensuring the balanced output of the coal-water treatment device and maintaining water balance. At the same time, the coal-containing wastewater regulating tank is equipped with a lifting pump to the 500-cubic-meter pre-sedimentation tank. After the valve is switched, the pipeline between the 500-cubic-meter pre-sedimentation tank and the coal-containing wastewater regulating tank is used to achieve two-way water pumping. When the liquid level in the 500-cubic-meter pre-sedimentation tank is greater than 1.75m, the selected lifting pump is started.

7. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 6, characterized in that: When the liquid level in the 500-cubic-meter pre-sedimentation tank is less than 0.8 m, the coal-water lift pump is shut down, and one pump is used as a backup, which will automatically switch in case of failure.

8. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 7, characterized in that: The distributed coal-water collection system includes six secondary sedimentation and separation coal-water collection pools that are rationally arranged according to the region. The surrounding sewage automatically flows into the nearest coal-water collection pool through trench pipes for buffering and sedimentation.

9. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 8, characterized in that: The sewage after sedimentation and stratification is automatically started and stopped by the coal-water lifting pump through liquid level control, and is directly pumped into the pre-sedimentation tank. After sufficient sedimentation, it is pumped into the front-end filtration and regulating tank of the electric flocculation for centralized treatment, and then pumped into the coal-water reuse clear water tank for standby use.

10. The intelligent zero-discharge treatment system for coal-containing wastewater according to claim 9, characterized in that: In the clean water reuse stage, the outlet pressure of the reuse water pump is tracked according to the increase or decrease in water use occasions to achieve variable frequency constant pressure water supply.

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