Sewage treatment device with multiple industrial wastewater pretreatment and method thereof

Abstract

The invention discloses a sewage treatment device with multiple industrial wastewater pretreatment, which comprises an emergency treatment tank, an adjusting tank, a hydrolysis acidification tank, a multifunctional tank and a sedimentation tank, and is characterized in that the emergency treatment tank is used for collecting temporarily stored overproof or abnormal incoming water so as to reduce the impact on a subsequent system; the regulating tank is used for regulating and controlling the flow of the sewage and balancing the water quality again; the hydrolysis acidification pool is used for carrying out hydrolysis acidification treatment on sewage, and the multifunctional pool is used for selecting a corresponding working mode according to the sewage treatment effect of the hydrolysis acidification pool and related characteristics of industrial sewage; the sedimentation tank is used for sludge sedimentation. According to the pretreatment device, integrated design is adopted, different functions are integrated in one set of system, the multiple functions can be adjusted, and the purposes that one pool has multiple purposes and the occupied area is saved are achieved. According to the pretreatment method for multiple industrial wastewater, multiple treatment processes are combined and superposed, free switching among multiple working conditions can be achieved according to the characteristics of the inlet water quality of the industrial wastewater, and the process practicability is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment device and method capable of pre-treating multiple industrial wastewaters. Background Art

[0002] Industrial park wastewater has the characteristics of complex water quality, poor biodegradability, large fluctuations in water quality and quantity, high risk of excessive water quality, and high toxicity. Due to the differences in production processes and products of industrial enterprises, there is no fixed technical treatment process that can be applied to industrial wastewater treatment technology. There are still some key technical problems that have not been solved, and industrial wastewater treatment is still a global problem.

[0003] The above characteristics of industrial park wastewater bring certain difficulties to the selection of process. In order to make the effluent stable and meet the standards, the traditional treatment idea of ​​industrial park wastewater is: on the basis of conventional sewage treatment process, extend the process treatment process, extend the reaction time, and increase the dosage. The traditional treatment idea has the disadvantages of high investment, large land occupation, and high treatment cost. If some treatment facilities are simplified or not equipped in order to reduce investment and land occupation, it will bring certain risks to the stable effluent meeting the standards. Therefore, how to find a balance between economic applicability and process stability is the research direction of industrial wastewater treatment.

[0004] In the existing technology, industrial park wastewater treatment usually adopts the process of "pretreatment + biochemical treatment + deep treatment". The characteristics of industrial park wastewater being difficult to biodegrade and complex make conventional biological treatment limited in effect on industrial wastewater treatment. It is necessary to add pretreatment processes to improve the biodegradability of industrial water, reduce the toxicity of sewage, and reduce the fluctuation of water quality and quantity. Therefore, the selection of pretreatment processes is very important for improving the biodegradability of industrial wastewater, reducing the toxicity of wastewater, and stabilizing the fluctuation of water quality and quantity, which directly determines the treatment effect of the biochemical system, the overall investment and operating costs of the project.

[0005] The pretreatment process of industrial park wastewater mainly includes: emergency treatment system, water quality and quantity regulation system, and enhanced primary treatment system. According to the different types of industrial wastewater and their different water quality characteristics, the process selection of enhanced primary treatment system mainly includes: hydrolysis acidification, strong oxidation, and coagulation sedimentation. Due to the complexity and diversity of industrial park wastewater, the enhanced primary treatment system of industrial parks often adopts a variety of combined processes. In addition, during the operation of the sewage treatment plant, the process flow needs to be continuously adjusted and optimized according to the actual situation of the influent in order to obtain better economic and environmental benefits. This leads to the need for sewage treatment plants to change and adjust the treatment process when treating different sewage, which affects the treatment efficiency of sewage.

[0006] It can be seen that the above traditional processes have strong limitations and are not generalizable. In view of this situation, it is necessary to develop a multifunctional, adjustable, economically and environmentally friendly industrial wastewater pretreatment facility. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a sewage treatment device and method with multiple industrial wastewater pretreatment, aiming to solve the problem that a single treatment process in the prior art cannot meet the complex and changeable industrial wastewater, and often requires a combination of multiple processes. However, when multiple processes are combined, the process flow is relatively complicated and needs to be adjusted and optimized accordingly according to different sewage characteristics, which affects the sewage treatment efficiency.

[0008] The present invention is implemented by the following technical solutions: A sewage treatment device with multiple industrial wastewater pretreatment functions, including an emergency treatment tank, a regulating tank, a hydrolysis acidification tank, a multifunctional tank and a sedimentation tank; The emergency treatment pool is provided with a first water inlet and a first drain, the first water inlet is connected to an external pipe, and the first drain is connected to the regulating pool; The regulating tank comprises a second water inlet, a third water inlet and a second drain outlet, the second water inlet is connected to the first drain outlet, the third water inlet is connected to an external pipeline, and the second drain outlet is connected to the hydrolysis acidification tank; The hydrolysis acidification tank comprises a fourth water inlet and a plurality of third drainage outlets, the fourth water inlet is connected to the second drainage outlet, and the plurality of third drainage outlets are connected to the multifunctional tank; The multifunctional pool comprises a plurality of fifth water inlets and a fourth drainage outlet. The plurality of fifth water inlets are connected with the plurality of third drainage outlets, and the fourth drainage outlet is connected with the sedimentation tank.

[0009] To optimize the above technical solutions, the specific measures taken also include: Furthermore, the emergency treatment tank, regulating tank, hydrolysis acidification tank, multifunctional tank and sedimentation tank constitute a first working mode, and the regulating tank, hydrolysis acidification tank, multifunctional tank and sedimentation tank constitute a second working mode.

[0010] Furthermore, a lifting pump is provided between the emergency treatment tank and the regulating tank.

[0011] Furthermore, the hydrolysis acidification tank is provided with a first treatment unit and a second treatment unit connected in sequence, a water distribution weir is provided at the water inlet end of the first treatment unit, and a water distribution area is provided between the first treatment unit and the fourth water inlet.

[0012] Furthermore, the first treatment unit includes two parallel first treatment pools, both of which are connected to the water distribution area, and the second treatment unit includes two parallel second treatment pools, both of which are connected to the corresponding first treatment pools.

[0013] Furthermore, a partition wall is arranged between the first treatment pool and the second treatment pool which are interconnected, and a through hole is arranged on the partition wall. The third drain outlet is arranged on the side wall connecting the second treatment pool and the multi-functional pool, and the corresponding through holes and the third drain outlet on the partition wall are staggered.

[0014] Furthermore, an agitator is provided in the hydrolysis acidification tank, an aeration system is provided at the bottom of the multifunctional tank, and the multifunctional tank is provided with a hydrolysis working mode, a strong oxidation working mode, and a mixed flocculation working mode.

[0015] Furthermore, the sedimentation tank is connected to the first processing unit in the hydrolysis acidification tank via a sludge return pipe, and a sludge screw pump is provided on the sludge return pipe.

[0016] Furthermore, a sludge scraper is provided inside the sedimentation tank for discharging sludge.

[0017] A sewage treatment method with multiple industrial wastewater pretreatment, comprising the following steps: Monitor the relevant indicators of sewage. If the set threshold is exceeded, the sewage will be transported to the emergency treatment pool through an external pipeline for temporary storage. If it does not exceed the set threshold, the sewage will be transported to the regulating pool through an external pipeline for water quality balance treatment and flow control; The pretreated sewage is transported to the regulating tank through a lift pump; The regulating tank transports the sewage to the hydrolysis and acidification tank at a set flow rate for hydrolysis and acidification treatment; The hydrolyzed and acidified sewage is transported to a multifunctional pool, sewage-related indicators are monitored, and different working modes of the multifunctional pool are selected, wherein the working modes of the multifunctional pool include a hydrolysis working mode, a strong oxidation working mode, and a mixed flocculation working mode; The sewage after reaction in the multifunctional tank is transported to the sedimentation tank for sludge sedimentation; Part of the precipitated sludge is transported to the hydrolysis acidification tank through the sludge return pipe.

[0018] Beneficial effects of the present invention: Compared with the prior art, the multiple industrial wastewater pretreatment device of the present invention has multiple functions such as temporary storage of accident water, homogenization and equalization, improvement of wastewater biodegradability, strong oxidation and chain breaking, etc. It also adopts an integrated design to integrate different functions into one system, and multiple functions can be adjusted to achieve the purpose of multiple uses of one pool and save space.

[0019] The pool structure among the hydrolysis acidification pool, the multifunctional pool and the sedimentation pool provided in the device enables the multifunctional pool to have a variety of working modes, and cooperate with the hydrolysis acidification pool and the sedimentation pool at the same time. When the multifunctional pool is in the working conditions of coagulation sedimentation and strong oxidation, the sedimentation pool with sedimentation function can be shared with the hydrolysis acidification pool, and no separate sedimentation system is required.

[0020] The multiple industrial wastewater pretreatment method of the present invention combines and superimposes a variety of treatment processes, and can be freely switched among a variety of working conditions according to the water quality characteristics of the industrial wastewater inlet. The process has strong practicality, a wide range of applications, and strong replicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of a sewage treatment device with multiple industrial wastewater pretreatment capabilities.

[0022] Figure numerals: emergency treatment tank 10, first water inlet 11, first drain outlet 12, regulating tank 20, second water inlet 21, third water inlet 22, second drain outlet 23, hydrolysis acidification tank 30, fourth water inlet 31, third drain outlet 32, water distribution weir 33, first treatment tank 34, second treatment tank 35, partition wall 36, through hole 361, multi-functional tank 40, fifth water inlet 41, fourth drain outlet 42, sedimentation tank 50, scraper 51, lift pump 60, sludge return pipe 70, sludge screw pump 80. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] Reference Figure 1 The present embodiment provides a sewage treatment device with multiple industrial wastewater pretreatment, including an emergency treatment tank 10, a regulating tank 20, a hydrolysis acidification tank 30, a multifunctional tank 40 and a sedimentation tank 50. The emergency treatment tank 10 is used to collect and temporarily store water that exceeds the standard or has abnormal water inflow, so as to reduce the impact on subsequent systems; the regulating tank 20 is used to adjust and control the flow of sewage and balance the water quality again; the hydrolysis acidification tank 30 is used to hydrolyze and acidify the sewage, and the multifunctional tank 40 is used to select a corresponding working mode according to the treatment effect of the hydrolysis acidification tank 30 on the sewage and the relevant characteristics of the industrial sewage; the sedimentation tank 50 is used for sludge precipitation.

[0026] Since the composition of industrial wastewater is relatively complex and there are large differences between different industrial wastewaters, in order to better balance the water quality, the emergency treatment tank 10, the regulating tank 20, the hydrolysis acidification tank 30, the multifunctional tank 40 and the sedimentation tank 50 constitute the first working mode, and the regulating tank 20, the hydrolysis acidification tank 30, the multifunctional tank 40 and the sedimentation tank 50 constitute the second working mode.

[0027] A first water inlet 11 and a first drain outlet 12 are provided on the emergency treatment pool 10. The first water inlet 11 is connected to an external pipeline, and the first drain outlet 12 is connected to the regulating pool; the regulating pool 20 includes a second water inlet 21, a third water inlet 22 and a second drain outlet 23. The second water inlet 21 is connected to the first drain outlet 12, the third water inlet 22 is connected to an external pipeline, and the second drain outlet 23 is connected to the hydrolysis acidification pool 30.

[0028] In order to maintain the efficiency of sewage flow, a lifting pump is provided between the emergency treatment tank 10 and the regulating tank 20 .

[0029] The regulating tank 20 will select an appropriate flow rate according to the total amount of sewage, the rate at which sewage flows into the regulating tank 20, and the treatment efficiency of sewage in subsequent processes, and transport the sewage to the hydrolysis acidification tank 30. The hydrolysis acidification tank 30 includes a fourth water inlet 31 and multiple third drain outlets 32. The fourth water inlet 31 is connected to the second drain outlet 23, and the multiple third drain outlets 32 are connected to the multi-functional tank 40.

[0030] The hydrolysis acidification tank 30 is provided with a first treatment unit and a second treatment unit connected in sequence, a water distribution weir 33 is provided at the water inlet end of the first treatment unit, and a water distribution area is provided between the first treatment unit and the fourth water inlet. The water distribution area and the water distribution weir 33 can distribute water evenly. A stirring device is provided in the hydrolysis acidification tank 30 to facilitate the distribution, mixing and contact of sewage and sludge, which is beneficial to the hydrolysis acidification reaction.

[0031] The first treatment unit includes two parallel first treatment tanks 34, both of which are connected to the water distribution area, and the second treatment unit includes two parallel second treatment tanks 35, both of which are connected to the corresponding first treatment tanks 34. Hydrolysis and acidification are used to convert macromolecular refractory organic matter into small molecular substances that are more easily utilized by subsequent aerobic or anaerobic microorganisms, thereby improving the biodegradability of sewage.

[0032] A partition wall 36 is provided between the interconnected first treatment pool 34 and the second treatment pool 35, and a through hole 361 is provided on the partition wall 36. The third drain outlet 32 ​​is provided on the side wall connecting the second treatment pool 35 and the multifunctional pool 40, and the corresponding through holes 361 and the third drain outlet 32 ​​on the partition wall 36 are staggered. After passing through the water distribution weir 33, the sewage will enter the first treatment unit and the second treatment unit in turn. Through the staggered through holes and the third drain outlet 32, the sewage can stay in the corresponding treatment unit for a longer time and react more fully. By setting two groups of treatment pools, on the one hand, the two groups of treatment pools can be operated synchronously, which improves the treatment efficiency of sewage; on the other hand, the two groups of treatment pools can be used alternately, which is convenient for maintenance.

[0033] The sewage treated in the hydrolysis acidification tank 30 enters the multifunctional tank 40, which includes a plurality of fifth water inlets 41 and a fourth drainage port 42. The plurality of fifth water inlets 41 are connected to the plurality of third drainage ports 32, and the fourth drainage port 42 is connected to the sedimentation tank 50. An aeration system is provided at the bottom of the multifunctional tank 40. The multifunctional tank 40 is provided with a hydrolysis working mode, a strong oxidation working mode, and a mixed flocculation working mode, which can be adjusted accordingly according to the relevant indicators of the sewage treated in the first treatment tank 34 and the second treatment tank 35.

[0034] Multifunctional pool mode selection: Hydrolysis mode: The sewage in the regulating tank is tested for relevant indicators. When the biodegradability of the sewage water quality is good, the multifunctional tank selects the hydrolysis mode to continuously degrade the sewage to form small molecules.

[0035] Strong oxidation mode: The sewage in the regulating tank is tested for relevant indicators. When the biodegradability of the sewage is poor, the multifunctional pool selects the strong oxidation mode and starts the aeration system inside the multifunctional pool as a stirrer to mix the sewage and the reagent evenly. At the same time, when the strong oxidation mode is in progress, a strong oxidizing agent is added to the multifunctional pool to enhance the oxidation effect. Strong oxidizing agents include one or more combinations of hydrogen peroxide oxidants, ozone, Fenton's reagent, and perchlorate.

[0036] Mixed flocculation mode: The sewage in the regulating tank is tested for relevant indicators. If the influent water contains a large amount of heavy metal ions, the multifunctional tank selects the mixed flocculation mode, and adds mixed flocculation agents to the multifunctional tank for mixed flocculation, and then enters the sedimentation tank to remove heavy metals. The mixed flocculation agents include one or more combinations of aluminum salts, iron salts, polyacrylamide, and biopolymer flocculants.

[0037] The sewage treated by the multifunctional tank 40 enters the sedimentation tank 50 for sludge sedimentation. A sludge scraper is provided inside the sedimentation tank 50 to discharge the sludge. The sedimentation tank 50 is connected to the first treatment unit in the hydrolysis acidification tank 30 through a sludge return pipe 70. A sludge screw pump 80 is provided on the sludge return pipe 70 to replenish the amount of sludge in the hydrolysis acidification tank 30, maintain the activity of the sludge, and ensure that the hydrolysis efficiency is continuously high.

[0038] A treatment method of a sewage treatment device with multiple industrial wastewater pretreatment, characterized by comprising the following steps: Monitor the relevant indicators of sewage. If the set threshold is exceeded, the sewage will be transported to the emergency treatment pool through an external pipeline for temporary storage. If it does not exceed the set threshold, the sewage will be transported to the regulating pool through an external pipeline for water quality balance treatment and flow control; The pretreated sewage is transported to the regulating tank through a lift pump; The regulating tank transports the sewage to the hydrolysis and acidification tank at a set flow rate for hydrolysis and acidification treatment; The hydrolyzed and acidified sewage is transported to a multifunctional pool, sewage-related indicators are monitored, and different working modes of the multifunctional pool are selected, wherein the working modes of the multifunctional pool include a hydrolysis working mode, a strong oxidation working mode, and a mixed flocculation working mode; The sewage after reaction in the multifunctional tank is transported to the sedimentation tank for sludge sedimentation; Part of the precipitated sludge is transported to the hydrolysis acidification tank through the sludge return pipe.

[0039] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A sewage treatment device with multiple industrial wastewater pretreatment, characterized by: Including emergency treatment tanks, regulating tanks, hydrolysis acidification tanks, multi-functional tanks and sedimentation tanks; The emergency treatment pool is provided with a first water inlet and a first drain, the first water inlet is connected to an external pipeline, and the first drain is connected to the regulating pool; The regulating tank comprises a second water inlet, a third water inlet and a second drain outlet, the second water inlet is connected to the first drain outlet, the third water inlet is connected to an external pipeline, and the second drain outlet is connected to the hydrolysis acidification tank; The hydrolysis acidification tank comprises a fourth water inlet and a plurality of third drainage outlets, the fourth water inlet is connected to the second drainage outlet, and the plurality of third drainage outlets are connected to the multifunctional tank; The multifunctional pool comprises a plurality of fifth water inlets and a fourth drainage outlet. The plurality of fifth water inlets are connected with the plurality of third drainage outlets, and the fourth drainage outlet is connected with the sedimentation tank.

2. A sewage treatment device with multiple industrial wastewater pretreatment according to claim 1, characterized in that: The emergency treatment tank, regulating tank, hydrolysis acidification tank, multifunctional tank and sedimentation tank constitute a first working mode, and the regulating tank, hydrolysis acidification tank, multifunctional tank and sedimentation tank constitute a second working mode.

3. A sewage treatment device with multiple industrial wastewater pretreatment according to claim 2, characterized in that: A lifting pump is arranged between the emergency treatment tank and the regulating tank.

4. A sewage treatment device with multiple industrial wastewater pretreatment according to claim 3, characterized in that: The hydrolysis acidification tank is provided with a first treatment unit and a second treatment unit connected in sequence, a water distribution weir is provided at the water inlet end of the first treatment unit, and a water distribution area is provided between the first treatment unit and the fourth water inlet.

5. The sewage treatment device with multiple industrial wastewater pretreatment according to claim 4 is characterized by: The first treatment unit includes two parallel first treatment pools, both of which are connected to the water distribution area; the second treatment unit includes two parallel second treatment pools, both of which are connected to the corresponding first treatment pools.

6. The sewage treatment device with multiple industrial wastewater pretreatment according to claim 5 is characterized by: A partition wall is arranged between the first treatment pool and the second treatment pool which are interconnected. A through hole is arranged on the partition wall. The third drain outlet is arranged on the side wall connecting the second treatment pool and the multifunctional pool. The corresponding through holes and the third drain outlet on the partition wall are staggered.

7. The sewage treatment device with multiple industrial wastewater pretreatment according to claim 6 is characterized by: An agitator is arranged in the hydrolysis acidification tank, an aeration system is arranged at the bottom of the multifunctional tank, and the multifunctional tank is provided with a hydrolysis working mode, a strong oxidation working mode and a mixed flocculation working mode.

8. The sewage treatment device with multiple industrial wastewater pretreatment according to claim 7 is characterized by: The sedimentation tank is connected to the first processing unit in the hydrolysis acidification tank through a sludge return pipeline, and a sludge screw pump is arranged on the sludge return pipeline.

9. The sewage treatment device with multiple industrial wastewater pretreatment according to claim 1, characterized in that: A sludge scraper is arranged inside the sedimentation tank to discharge sludge.

10. A method for treating wastewater using the sewage treatment device with multiple industrial wastewater pretreatment according to any one of claims 1 to 9, characterized in that: The following steps are involved: Monitor the relevant indicators of sewage. If the set threshold is exceeded, the sewage will be transported to the emergency treatment pool through an external pipeline for temporary storage. If it does not exceed the set threshold, the sewage will be transported to the regulating pool through an external pipeline for water quality balance treatment and flow control; The pretreated sewage is transported to the regulating tank through a lift pump; The regulating tank transports the sewage to the hydrolysis and acidification tank at a set flow rate for hydrolysis and acidification treatment; The hydrolyzed and acidified sewage is transported to a multifunctional pool, sewage-related indicators are monitored, and different working modes of the multifunctional pool are selected, wherein the working modes of the multifunctional pool include a hydrolysis working mode, a strong oxidation working mode, and a mixed flocculation working mode; The sewage after reaction in the multifunctional tank is transported to the sedimentation tank for sludge sedimentation; Part of the precipitated sludge is transported to the hydrolysis acidification tank through the sludge return pipe.

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