An acidic wastewater treatment system

Abstract

This utility model discloses an acidic wastewater treatment system, belonging to the field of water pollution treatment technology. It includes a collection tank, a physicochemical treatment tank, a buffer tank, and a biological treatment tank. The collection tank and the physicochemical treatment tank are connected by a physicochemical inlet pipe, on which a physicochemical pump is installed. The physicochemical treatment tank and the buffer tank are connected by a physicochemical outlet pipe. The physicochemical treatment tank includes a mixing zone, a flocculation zone, and a sedimentation zone connected in sequence. The buffer tank and the biological treatment tank are connected by a biological inlet pipe, on which a biological pump is installed. The biological treatment tank includes a nitrification section, a denitrification section, and a biological sedimentation section connected in sequence. This utility model can avoid water treatment accidents caused by unstable drainage due to discontinuous production.

Description

Technical Field

[0001] This utility model relates to an acidic wastewater treatment system, belonging to the field of water pollution treatment technology. Background Technology

[0002] Industrial acidic wastewater mainly originates from production wastewater in industries such as chemical engineering, metal surface treatment, photovoltaic cells, and semiconductor electronics. For example, processes such as synthesis, etching, pickling, and desulfurization generate low-pH wastewater containing sulfuric acid, hydrochloric acid, HF, and HNO3. This wastewater often contains heavy metal pollutants and organic pollutants such as cleaning agents, making its composition complex and requiring a long treatment process.

[0003] The common treatment method involves neutralization, coagulation sedimentation, and biological treatment to remove pollutants. However, the discharge cycle of acidic wastewater is unstable, and the quality and quantity of the discharged water fluctuate greatly, often making it difficult to continuously treat multiple processes. Insufficient or excessive coagulation and chemical dosing can fail to achieve the desired treatment effect and instead increase secondary pollution of sludge and treatment costs. Especially when treating mixed acidic wastewater containing organic matter, total nitrogen, fluoride, and suspended solids simultaneously, ensuring the continuity of the upstream and downstream process systems and controlling the optimal reaction environment for physicochemical and biological treatments to achieve stable treatment results are significant challenges for this type of industrial wastewater.

[0004] The irregular fluctuations in the front-end neutralization and coagulation treatment, and improper operation or control, can easily lead to excessive dosing and excessive sludge production. Insufficient dosing, on the other hand, can cause sludge to be difficult to settle, and incomplete removal of fluoride, silicon, and metal ions, which increases the difficulty of microbial treatment of organic matter and nitrogen pollutants in the later stage. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the problems of excessive sludge production due to overdosing and insufficient dosing leading to poor sludge settling, incomplete removal of fluoride, silicon, and metal ions, and increased difficulty in the microbial treatment of organic matter and nitrogen pollutants in the later stage, this utility model provides an acidic wastewater treatment system.

[0006] Technical solution: To achieve the above objectives, the technical solution adopted by this utility model is as follows: An acidic wastewater treatment system includes a collection tank, a physicochemical treatment tank, a buffer tank, and a biological treatment tank, wherein: The collection tank and the physicochemical treatment tank are connected by a physicochemical inlet pipe, and a physicochemical pump is installed on the physicochemical inlet pipe.

[0007] The physicochemical treatment tank and the buffer tank are connected by a physicochemical effluent pipe. The physicochemical treatment tank includes a mixing zone, a flocculation zone, and a sedimentation zone connected in sequence.

[0008] The buffer tank and the biochemical treatment tank are connected by a biochemical inlet pipe, and a biochemical pump is installed on the biochemical inlet pipe.

[0009] The biochemical treatment tank includes a nitrification section, a denitrification section, and a biochemical sedimentation section connected in sequence.

[0010] Preferably, the biochemical treatment tank is equipped with a drainage return pipe, the outlet of the biochemical sedimentation section is connected to a drainage pipe, the inlet of the drainage return pipe is connected to the drainage pipe, the outlet of the drainage return pipe is connected to the nitrification section, and a drainage return pump is installed on the drainage return pipe.

[0011] Preferably, the biological treatment tank is equipped with a sludge return pipe. The sludge outlet of the biological sedimentation section is connected to a sludge discharge pipe, the sludge inlet of the sludge return pipe is connected to the sludge discharge pipe, the sludge outlet of the sludge return pipe is connected to the nitrification section, and a sludge return pump is installed on the sludge return pipe.

[0012] Preferably, the flocculation zone is equipped with a mixer.

[0013] Preferably, the sedimentation zone is equipped with an inclined tube packing assembly.

[0014] Preferably: the denitrification section is provided with ORP instrument.

[0015] Preferably, the collection tank is equipped with a collection tank level gauge, and the buffer tank is equipped with a buffer tank level gauge.

[0016] Preferably, the flocculation zone is equipped with a physicochemical pH meter, and the nitrification zone is equipped with a biochemical pH meter.

[0017] Preferably, the buffer tank is equipped with a pre-adjusted pH meter. The buffer tank is also equipped with an alkali dosing assembly and an acid dosing assembly.

[0018] Preferably, the bottom of the collection tank is provided with aeration holes, which are connected to an aerator.

[0019] Compared with the prior art, this utility model has the following advantages: This invention adds a buffer tank between the physicochemical treatment tank and the biological treatment tank, preventing the wastewater that has undergone physicochemical treatment from directly entering the biological treatment tank for biological treatment. This effectively avoids the problem of inconsistent wastewater treatment speeds between the physicochemical and biological treatment tanks, which leads to changes in the dosage and unstable dosing. Therefore, it can avoid water treatment accidents caused by unstable drainage due to discontinuous production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 Schematic diagram of an acidic wastewater treatment system Figure 1 .

[0022] Figure 3 Schematic diagram of an acidic wastewater treatment system Figure 2 .

[0023] Figure 4 This is an online pH operating curve for a system without on / off ratio adjustment.

[0024] Figure 5 The online pH operation curve of the system with open-end ratio adjustment.

[0025] In the diagram, 1 is the collection tank, 12 is the aeration hole, 13 is the collection tank level gauge, 21 is the physicochemical pump, 22 is the physicochemical inlet pipe, 3 is the physicochemical treatment tank, 31 is the mixing zone, 32 is the flocculation zone, 33 is the mixer, 34 is the sedimentation zone, 35 is the inclined tube packing assembly, 36 is the physicochemical effluent pipe, 37 is the physicochemical pH meter, 4 is the buffer tank, 42 ​​is the buffer tank level gauge, 43 is the pre-adjusted pH meter, 44 is the alkali dosing assembly, 45 is the acid dosing assembly, 51 is the biological pump, 52 is the biological inlet pipe, 6 is the biological treatment tank, 62 is the nitrification section, 63 is the denitrification section, 64 is the biological sedimentation section, 641 is the sludge discharge pipe, and 65 is... ORP Instruments: 66 is a biochemical pH meter, 67 is a drainage return pump, 671 is a drainage return pipe, 68 is a return sludge pump, 681 is a sludge return pipe, and 69 is a drainage pipe. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims. Example

[0027] Physicochemical treatment tanks typically remove pollutants such as fluorides, suspended solids, hardness, and silicates from photovoltaic wastewater through chemical reactions, precipitation, or filtration. However, this involves the generation of large amounts of sludge, and the sludge removal process causes fluctuations in the liquid level of downstream treatment tanks. The limited volume of collection tanks often cannot meet the demands of large, fluctuating flow rates and periods of acidic wastewater discharge. Furthermore, due to the highly corrosive nature of acidic wastewater, collection tanks require significant anti-corrosion and maintenance costs, often resulting in insufficient retention time. This can easily lead to situations where the initial liquid level is low while the subsequent tank shuts down, and there is also the risk of overflowing at high levels, potentially causing safety accidents. To address the issue of irregular fluctuations in the initial neutralization and coagulation treatment of industrial acidic wastewater, this embodiment provides an acidic wastewater treatment system, such as... Figure 1-5As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, and a physicochemical pump 21 is installed on the physicochemical inlet pipe 22. By controlling the physicochemical pump 21, the wastewater in the collection tank 1 is pumped into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22.

[0028] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. The wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence.

[0029] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0030] The biochemical treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biochemical sedimentation section 64 connected in sequence.

[0031] This invention adds a buffer tank between the physicochemical treatment tank and the biological treatment tank, preventing the wastewater that has undergone physicochemical treatment from directly entering the biological treatment tank for biological treatment. This effectively avoids the problem of inconsistent wastewater treatment speeds between the physicochemical and biological treatment tanks, which leads to changes in the dosage and unstable dosing. Therefore, it can avoid water treatment accidents caused by unstable drainage due to discontinuous production. Example

[0032] This embodiment provides an acidic wastewater treatment system, such as Figure 2 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, and a physicochemical pump 21 is installed on the physicochemical inlet pipe 22. By controlling the physicochemical pump 21, the wastewater in the collection tank 1 is pumped into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22.

[0033] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. The wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence.

[0034] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0035] The biochemical treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biochemical sedimentation section 64 connected in sequence.

[0036] The biochemical treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biochemical sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Drainage return is achieved through the drainage return pipe 671 and the drainage return pump 67. Example

[0037] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, and a physicochemical pump 21 is installed on the physicochemical inlet pipe 22. By controlling the physicochemical pump 21, the wastewater in the collection tank 1 is pumped into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22.

[0038] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. The wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence.

[0039] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0040] The biochemical treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biochemical sedimentation section 64 connected in sequence.

[0041] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68. Example

[0042] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, and a physicochemical pump 21 is installed on the physicochemical inlet pipe 22. By controlling the physicochemical pump 21, the wastewater in the collection tank 1 is pumped into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22.

[0043] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. The wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence.

[0044] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0045] The biochemical treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biochemical sedimentation section 64 connected in sequence.

[0046] The biological treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biological sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Sludge return is achieved through a sludge return pipe 681 and a sludge return pump 68.

[0047] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68. Example

[0048] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, and a physicochemical pump 21 is installed on the physicochemical inlet pipe 22. By controlling the physicochemical pump 21, the wastewater in the collection tank 1 is pumped into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22.

[0049] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. Wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence. The flocculation zone 32 is equipped with a stirrer 33 to facilitate a complete physicochemical reaction. The sedimentation zone 34 is equipped with an inclined tube packing assembly 35 to improve sedimentation load and efficiency.

[0050] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0051] The biological treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biological sedimentation section 64 connected in sequence. The denitrification section 63 is equipped with... ORP Instrument 65, through ORP Instrument 65 monitors the denitrification section 63 in real time. ORP get ORP value.

[0052] The biological treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biological sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Sludge return is achieved through a sludge return pipe 681 and a sludge return pump 68.

[0053] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68. Example

[0054] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, and a physicochemical pump 21 is installed on the physicochemical inlet pipe 22. By controlling the physicochemical pump 21, the wastewater in the collection tank 1 is pumped into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22.

[0055] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. Wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence. The flocculation zone 32 is equipped with a stirrer 33 to facilitate a complete physicochemical reaction. The sedimentation zone 34 is equipped with an inclined tube packing assembly 35 to improve sedimentation load and efficiency.

[0056] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0057] The biological treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biological sedimentation section 64 connected in sequence. The denitrification section 63 is equipped with... ORP Instrument 65, through ORP Instrument 65 monitors the denitrification section 63 in real time. ORP get ORP value.

[0058] The biological treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biological sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Sludge return is achieved through a sludge return pipe 681 and a sludge return pump 68.

[0059] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68.

[0060] The collection tank 1 is equipped with a collection tank level gauge 13, which monitors the liquid level in the collection tank 1 in real time to obtain the collection tank level. The buffer tank 4 is equipped with a buffer tank level gauge 42, which monitors the liquid level in the buffer tank 4 in real time to obtain the buffer tank level. The collection tank level gauge 13 and the buffer tank level gauge 42 are linked and controlled with the physicochemical pump 21. The operating frequency of the physicochemical pump 21 is controlled by the interaction between the collection tank level gauge 13 and the buffer tank level gauge 42, thereby controlling the water flow rate in the biochemical inlet pipe 52. Example

[0061] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, on which a physicochemical pump 21 is installed. The physicochemical pump 21 pumps wastewater from the collection tank 1 into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22. The bottom of the collection tank 1 is provided with aeration holes 12, which are connected to an aerator to mix the wastewater from the collection tank 1, achieving initial homogenization and quantity.

[0062] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. Wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence. The flocculation zone 32 is equipped with a stirrer 33 to facilitate a complete physicochemical reaction. The sedimentation zone 34 is equipped with an inclined tube packing assembly 35 to improve sedimentation load and efficiency.

[0063] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0064] The biological treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biological sedimentation section 64 connected in sequence. The denitrification section 63 is equipped with... ORP Instrument 65, through ORP Instrument 65 monitors the denitrification section 63 in real time. ORP get ORP value.

[0065] The biological treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biological sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Sludge return is achieved through a sludge return pipe 681 and a sludge return pump 68.

[0066] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68.

[0067] The flocculation zone 32 is equipped with a physicochemical pH meter 37, which monitors the pH value of the physicochemical treatment tank 3 in real time to obtain the pH value of the physicochemical tank. The buffer tank 4 is equipped with a pre-adjustment pH meter 43, an alkali dosing assembly 44, and an acid dosing assembly 45. The pre-adjustment pH meter 43 monitors the pre-adjustment pH value of the buffer tank 4 in real time. The physicochemical pH meter 37, the pre-adjustment pH meter 43, the alkali dosing assembly 44, and the acid dosing assembly 45 are linked and controlled. The pH value of the physicochemical tank measured by the physicochemical pH meter 37 and the pre-adjustment pH value monitored in real time by the pre-adjustment pH meter 43 are used to control the addition of alkali or acid to the buffer tank 4 by the alkali dosing assembly 44 and the acid dosing assembly 45. Example

[0068] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, on which a physicochemical pump 21 is installed. The physicochemical pump 21 pumps wastewater from the collection tank 1 into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22. The bottom of the collection tank 1 is provided with aeration holes 12, which are connected to an aerator to mix the wastewater from the collection tank 1, achieving initial homogenization and quantity.

[0069] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. Wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence. The flocculation zone 32 is equipped with a stirrer 33 to facilitate a complete physicochemical reaction. The sedimentation zone 34 is equipped with an inclined tube packing assembly 35 to improve sedimentation load and efficiency.

[0070] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0071] The biological treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biological sedimentation section 64 connected in sequence. The denitrification section 63 is equipped with... ORP Instrument 65, through ORP Instrument 65 monitors the denitrification section 63 in real time. ORP get ORP value.

[0072] The biological treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biological sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Sludge return is achieved through a sludge return pipe 681 and a sludge return pump 68.

[0073] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68.

[0074] A biochemical pH meter 66 is installed on the nitrification section 62. The biochemical pH meter 66 monitors the pH of the nitrification section 62 in real time to obtain the biochemical pH. The biochemical pH meter 66 is linked to the alkali dosing component 44 for control, and the biochemical pH measured by the biochemical pH meter 66 is used to control the alkali dosing component 44 to add alkali to the biological treatment tank 6. Example

[0075] This embodiment provides an acidic wastewater treatment system, such as Figure 1-5 As shown, it includes a collection tank 1, a physicochemical treatment tank 3, a buffer tank 4, and a biochemical treatment tank 6, wherein: The collection tank 1 and the physicochemical treatment tank 3 are connected by a physicochemical inlet pipe 22, on which a physicochemical pump 21 is installed. The physicochemical pump 21 pumps wastewater from the collection tank 1 into the physicochemical treatment tank 3 through the physicochemical inlet pipe 22. The bottom of the collection tank 1 is provided with aeration holes 12, which are connected to an aerator to mix the wastewater from the collection tank 1, achieving initial homogenization and quantity.

[0076] The physicochemical treatment tank 3 and the buffer tank 4 are connected by a physicochemical effluent pipe 36. Wastewater after biological treatment flows into the buffer tank 4 through the physicochemical effluent pipe 36. The physicochemical treatment tank 3 includes a mixing zone 31, a flocculation zone 32, and a sedimentation zone 34 connected in sequence. The flocculation zone 32 is equipped with a stirrer 33 to facilitate a complete physicochemical reaction. The sedimentation zone 34 is equipped with an inclined tube packing assembly 35 to improve sedimentation load and efficiency.

[0077] The buffer tank 4 and the biochemical treatment tank 6 are connected by a biochemical inlet pipe 52, and a biochemical pump 51 is installed on the biochemical inlet pipe 52. By controlling the biochemical pump 51, the wastewater in the buffer tank 4 is pumped into the biochemical treatment tank 6 through the biochemical inlet pipe 52.

[0078] The biological treatment tank 6 includes a nitrification section 62, a denitrification section 63, and a biological sedimentation section 64 connected in sequence. The denitrification section 63 is equipped with... ORP Instrument 65, through ORP Instrument 65 monitors the denitrification section 63 in real time. ORP get ORP value.

[0079] The biological treatment tank 6 is equipped with a drainage return pipe 671. The outlet of the biological sedimentation section 64 is connected to a drainage pipe 69. The inlet of the drainage return pipe 671 is connected to the drainage pipe 69, and the outlet of the drainage return pipe 671 is connected to the nitrification section 62. A drainage return pump 67 is installed on the drainage return pipe 671. Sludge return is achieved through a sludge return pipe 681 and a sludge return pump 68.

[0080] The biological treatment tank 6 is equipped with a sludge return pipe 681. The sludge outlet of the biological sedimentation section 64 is connected to a sludge discharge pipe 641. The sludge inlet of the sludge return pipe 681 is connected to the sludge discharge pipe 641, and the sludge outlet of the sludge return pipe 681 is connected to the nitrification section 62. A sludge return pump 68 is installed on the sludge return pipe 681. Sludge return is achieved through the sludge return pipe 681 and the sludge return pump 68.

[0081] The collection tank 1 is equipped with a collection tank level gauge 13, which monitors the liquid level in the collection tank 1 in real time to obtain the collection tank level. The buffer tank 4 is equipped with a buffer tank level gauge 42, which monitors the liquid level in the buffer tank 4 in real time to obtain the buffer tank level. The collection tank level gauge 13 and the buffer tank level gauge 42 are linked and controlled with the physicochemical pump 21. The operating frequency of the physicochemical pump 21 is controlled by the interaction between the collection tank level gauge 13 and the buffer tank level gauge 42, thereby controlling the water flow rate in the biochemical inlet pipe 52.

[0082] The flocculation zone 32 is equipped with a physicochemical pH meter 37, which monitors the pH value of the physicochemical treatment tank 3 in real time to obtain the pH value of the physicochemical tank. The buffer tank 4 is equipped with a pre-adjustment pH meter 43, an alkali dosing assembly 44, and an acid dosing assembly 45. The pre-adjustment pH meter 43 monitors the pre-adjustment pH value of the buffer tank 4 in real time. The physicochemical pH meter 37, the pre-adjustment pH meter 43, the alkali dosing assembly 44, and the acid dosing assembly 45 are linked and controlled. The pH value of the physicochemical tank measured by the physicochemical pH meter 37 and the pre-adjustment pH value monitored in real time by the pre-adjustment pH meter 43 are used to control the addition of alkali or acid to the buffer tank 4 by the alkali dosing assembly 44 and the acid dosing assembly 45.

[0083] A biochemical pH meter 66 is installed on the nitrification section 62. The biochemical pH meter 66 monitors the pH of the nitrification section 62 in real time to obtain the biochemical pH. The biochemical pH meter 66 is linked to the alkali dosing component 44 for control, and the biochemical pH measured by the biochemical pH meter 66 is used to control the alkali dosing component 44 to add alkali to the biological treatment tank 6.

[0084] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An acidic wastewater treatment system, characterized by: It includes a collection tank (1), a physicochemical treatment tank (3), a buffer tank (4), and a biochemical treatment tank (6), wherein: The collection tank (1) and the physicochemical treatment tank (3) are connected by a physicochemical inlet pipe (22), and a physicochemical pump (21) is installed on the physicochemical inlet pipe (22); The physical and chemical treatment tank (3) and the buffer tank (4) are connected by a physical and chemical effluent pipe (36); the physical and chemical treatment tank (3) includes a mixing zone (31), a flocculation zone (32), and a sedimentation zone (34) connected in sequence; The buffer tank (4) and the biochemical treatment tank (6) are connected by a biochemical inlet pipe (52), and a biochemical pump (51) is installed on the biochemical inlet pipe (52); The biochemical treatment tank (6) includes a nitrification section (62), a denitrification section (63), and a biochemical sedimentation section (64) connected in sequence.

2. The acidic wastewater treatment system of claim 1, wherein: The biochemical treatment tank (6) is equipped with a drainage return pipe (671), the outlet of the biochemical sedimentation section (64) is connected to a drainage pipe (69), the inlet end of the drainage return pipe (671) is connected to the drainage pipe (69), the outlet end of the drainage return pipe (671) is connected to the nitrification section (62), and a drainage return pump (67) is installed on the drainage return pipe (671).

3. The system for treating acidic wastewater of claim 2, wherein: The biochemical treatment tank (6) is equipped with a sludge return pipe (681); the sludge outlet of the biochemical sedimentation section (64) is connected to a sludge discharge pipe (641); the sludge inlet end of the sludge return pipe (681) is connected to the sludge discharge pipe (641); the sludge outlet end of the sludge return pipe (681) is connected to the nitrification section (62); and a sludge return pump (68) is installed on the sludge return pipe (681).

4. The system for treating acidic wastewater of claim 3, wherein: The flocculation zone (32) is equipped with a mixer (33).

5. The acidic wastewater treatment system of claim 4, wherein: The sedimentation zone (34) is provided with an inclined tube packing assembly (35).

6. The acidic wastewater treatment system according to claim 5, characterized in that: An ORP meter (65) is installed on the denitrification section (63).

7. The acidic wastewater treatment system according to claim 6, characterized in that: The collection tank (1) is equipped with a collection tank level gauge (13), and the buffer tank (4) is equipped with a buffer tank level gauge (42).

8. The acidic wastewater treatment system according to claim 7, characterized in that: The flocculation zone (32) is equipped with a physicochemical pH meter (37), and the nitrification zone (62) is equipped with a biochemical pH meter (66).

9. The acidic wastewater treatment system according to claim 8, characterized in that: The buffer tank (4) is equipped with a pre-adjusted pH meter (43); the buffer tank (4) is equipped with an alkali dosing assembly (44) and an acid dosing assembly (45).

10. The acidic wastewater treatment system according to claim 9, characterized in that: The bottom of the collection tank (1) is provided with an aeration hole (12), which is connected to an aerator.

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