A sludge extracellular polymer substance stripping device

Abstract

The utility model relates to sewage treatment technical field discloses a kind of sludge extracellular polymer stripping devices, including mutually matched sewage treatment device, secondary sedimentation tank and extracellular polymer stripping carbon release device, and the output end of the secondary sedimentation tank is connected with effluent pipe and sludge pump that can discharge sludge to outside, and is equipped;The extracellular polymer stripping carbon release device includes sequentially connected ultrasonic unit, emulsion pump and emulsion tank, and the output end of the emulsion tank is connected with the input end of emulsion pump by third sludge backflow pump.The utility model has the advantages compared with prior art: extracellular polymer in activated sludge can be stripped and carbon released without affecting the activity of activated sludge, so that carbon source participates in sewage treatment again.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a sludge extracellular polymer stripping device. Background Technology

[0002] Currently, urban wastewater treatment plants in my country mainly use activated sludge treatment processes. A common problem during operation is the low carbon-to-nitrogen ratio in the influent, which negatively impacts the nitrogen removal efficiency of the biological system. Insufficient influent carbon sources, leading to low total nitrogen removal rates in the biological system, has become one of the most challenging problems faced by wastewater treatment plants. Currently, urban wastewater treatment plants in my country primarily use external carbon sources (glucose, sodium acetate, methanol, composite carbon sources, etc.) to improve the nitrogen removal efficiency, resulting in a sharp increase in wastewater treatment costs.

[0003] Extracellular polymers (EPPs) are an important component of activated sludge, containing abundant organic matter such as proteins and polysaccharides, and possess high bioavailability. Removing EPPs from the surface of activated sludge can serve as a supplementary carbon source for biological nitrogen removal, offering a novel approach to addressing the carbon source shortage in wastewater treatment plants. Further research is needed to achieve in-situ carbon source utilization of EPPs in activated sludge for biological nitrogen removal, without disrupting the sludge's biological metabolic activity. Utility Model Content

[0004] (I) Technical problems to be solved

[0005] The purpose of this invention is to solve the problems mentioned in the background art and to provide a sludge extracellular polymer stripping device.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a sludge extracellular polymer stripping device, including a sewage treatment device, a secondary sedimentation tank and an extracellular polymer stripping carbon release device that cooperate with each other, wherein the output end of the secondary sedimentation tank is connected to an outlet pipe and a sludge pump that can discharge sludge to the outside.

[0008] The extracellular polymer stripping carbon release device includes an ultrasonic unit, an emulsification pump, and an emulsification tank connected in sequence. The output end of the emulsification tank is connected to the input end of the emulsification pump through a third sludge return pump.

[0009] As an improvement, the wastewater treatment device includes an activated sludge biological reactor connected to a secondary sedimentation tank. The output end of the secondary sedimentation tank is connected to a first sludge return pump. The output end of the first sludge return pump is connected to an extracellular polymer stripping and carbon release device. The output end of the extracellular polymer stripping and carbon release device is connected to the input end of the activated sludge biological reactor.

[0010] As an improvement, the wastewater treatment device includes an anoxic tank and an aerobic tank connected in sequence. The output end of the aerobic tank is connected to the input end of the secondary sedimentation tank. A nitrification liquid return pump is connected to the output end of the aerobic tank. The nitrification liquid return pump is connected to an extracellular polymer stripping and carbon release device. The output end of the extracellular polymer stripping and carbon release device is connected to the input end of the anoxic tank. The output end of the secondary sedimentation tank is connected to the input end of the anoxic tank through a second sludge return pump.

[0011] As an improvement, the emulsifying pump is a three-stage emulsifying pump.

[0012] (III) Beneficial Effects

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] 1. The wastewater treatment device can treat wastewater, and the secondary sedimentation tank can settle the wastewater;

[0015] 2. The extracellular polymer stripping and carbon release device can strip the extracellular polymers from the activated sludge in the pre-treated wastewater, allowing the extracellular polymers to participate in wastewater treatment again, reducing the addition of carbon sources and lowering the cost of wastewater treatment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 . Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] Example 1

[0020] Combined with appendix Figure 1-2 An extracellular polymeric substance (API) stripping device for sludge includes a wastewater treatment device, a secondary sedimentation tank, and an API stripping and carbon release device that work together. The output end of the secondary sedimentation tank is connected to an outlet pipe and a sludge pump that can discharge sludge to the outside. The wastewater treatment device can perform preliminary treatment on the wastewater, the secondary sedimentation tank can settle the wastewater, and the API stripping and carbon release device can strip the APIs from the activated sludge in the pre-treated wastewater.

[0021] The extracellular polymer stripping carbon release device includes an ultrasonic unit, an emulsification pump, and an emulsification tank connected in sequence. The output end of the emulsification tank is connected to the input end of the emulsification pump through a third sludge return pump.

[0022] The emulsifying pump is a three-stage emulsifying pump.

[0023] The secondary sedimentation tank output end, which is connected to the effluent pipe, is located at the top of the secondary sedimentation tank, while the secondary sedimentation tank output end, which is connected to the sludge pump, is located at the bottom of the secondary sedimentation tank.

[0024] The ultrasonic unit breaks down the activated sludge flocs, turning large flocs into multiple smaller flocs. Then, the high-speed rotating rotor and stator of the three-stage emulsification pump exert strong shearing, friction, and centrifugal force to strip the extracellular polymers from the activated sludge. This achieves the goal of releasing carbon sources by stripping the extracellular polymers without damaging the metabolic activity of the sludge, allowing the extracellular polymers to participate in wastewater treatment again, reducing the need for carbon source addition, and lowering the cost of wastewater treatment.

[0025] Example 2

[0026] Combined with appendix Figure 1 The wastewater treatment device includes an activated sludge biological reactor connected to a secondary sedimentation tank. The output end of the bottom of the secondary sedimentation tank is connected to a first sludge return pump. The output end of the first sludge return pump is connected to an extracellular polymer stripping and carbon release device. The output end of the extracellular polymer stripping and carbon release device is connected to the input end of the activated sludge biological reactor.

[0027] Wastewater first enters the activated sludge biological reactor, then the mixed liquor enters the secondary sedimentation tank for sludge-water separation, the effluent is discharged, part of the sludge at the bottom of the secondary sedimentation tank is discharged, and the other part is transported to the extracellular polymer stripping carbon release device through the first sludge return pump. The treated sludge is then transported to the activated sludge biological reactor.

[0028] Example 3

[0029] Combined with appendix Figure 2 The wastewater treatment device includes an anoxic tank and an aerobic tank connected in sequence. The output end of the aerobic tank is connected to the input end of the secondary sedimentation tank. A nitrification liquid return pump is connected to the output end of the aerobic tank. The nitrification liquid return pump is connected to an extracellular polymer stripping and carbon release device. The output end of the extracellular polymer stripping and carbon release device is connected to the input end of the anoxic tank. The output end of the bottom of the secondary sedimentation tank is connected to the input end of the anoxic tank through a second sludge return pump.

[0030] Wastewater enters the anoxic tank through the inlet pipe. The anoxic tank is connected to the aerobic tank, which in turn is connected to the secondary sedimentation tank via a pipeline. A sludge discharge system is installed at the bottom of the secondary sedimentation tank to discharge a portion of the sludge. Simultaneously, a residual sludge return system is installed, using a second sludge return pump to return a portion of the sludge to the anoxic tank. A nitrification liquor return pipeline is installed at the end of the aerobic tank. A nitrification liquor return pump transports the mixed liquor to the extracellular polymer stripping and carbon release device. After treatment, the mixed liquor enters the anoxic tank.

[0031] The working principle of this invention is as follows: Excess sludge or nitrification liquor return sludge first enters the ultrasonic unit through the sludge pump integrated into the excess sludge return system or nitrification liquor sludge return system. The cavitation effect of ultrasound breaks down the sludge flocs, breaking large flocs into smaller ones and loosening the floc structure, releasing a small amount of extracellular polymers from the sludge floc surface into the water. Then, the sludge enters the emulsification pump, which is a three-stage rotor emulsification pump. The high-speed rotating rotor and stator exert strong shearing, friction, and centrifugal force to peel off and dissolve the extracellular polymers from the activated sludge surface into the water. Since the suspended solids concentration of the nitrification liquor return sludge is low, typically 3-5 g / L, the sludge only needs one emulsification process after ultrasound. After passing through the emulsification pump, the sludge enters the emulsification tank and then flows out from the outlet. For excess sludge, due to its higher concentration, a third sludge return pump connected to the emulsification tank is activated to transport the sludge from the emulsification tank back to the emulsification pump inlet for secondary emulsification. The higher the suspended solids concentration of the excess sludge, the greater the sludge return flow rate. The flow rate of the third sludge return pump is 1-3 times that of the emulsification pump. The flow rate of the third sludge return pump is determined based on the suspended solids concentration of the excess sludge. When the suspended solids concentration of the excess sludge is 6-10 g / L, the flow rate of the third sludge return pump is 1-1.5 times that of the emulsification pump; when the suspended solids concentration of the excess sludge is 10-15 g / L, the flow rate of the third sludge return pump is 1.5-2.0 times that of the emulsification pump; and when the suspended solids concentration of the excess sludge is greater than 15 g / L, the flow rate of the third sludge return pump is 3 times that of the emulsification pump.

[0032] The core of this method and device is to use ultrasound and emulsification pumps to strip the extracellular polymers of activated sludge to release carbon sources. At the same time, it is necessary to precisely control the intensity of ultrasound and the number of emulsifications to ensure that the metabolic activity of the sludge is not broken. The active bacteria in the sludge and the released organic matter enter the anoxic tank together. The sludge bacteria use the organic matter they release as a carbon source to carry out biological carbon and nitrogen processes. In essence, it is the "cutting flesh to feed" of activated sludge to achieve in-situ carbon source conversion of the extracellular polymers of activated sludge.

[0033] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A sludge extracellular polymer stripping device, comprising a wastewater treatment unit, a secondary sedimentation tank, and an extracellular polymer stripping and carbon release unit that cooperate with each other, characterized in that: The output end of the secondary sedimentation tank is connected to an outlet pipe and a sludge pump that can discharge sludge to the outside. The extracellular polymer stripping carbon release device includes an ultrasonic unit, an emulsification pump, and an emulsification tank connected in sequence. The output end of the emulsification tank is connected to the input end of the emulsification pump through a third sludge return pump.

2. The apparatus for sludge exocellular polymer stripping according to claim 1, characterized in that: The wastewater treatment device includes an activated sludge biological reactor connected to a secondary sedimentation tank. The output end of the secondary sedimentation tank is connected to a first sludge return pump. The output end of the first sludge return pump is connected to an extracellular polymer stripping and carbon release device. The output end of the extracellular polymer stripping and carbon release device is connected to the input end of the activated sludge biological reactor.

3. The apparatus according to claim 1, wherein: The wastewater treatment device includes an anoxic tank and an aerobic tank connected in sequence. The output end of the aerobic tank is connected to the input end of the secondary sedimentation tank. A nitrification liquid return pump is connected to the output end of the aerobic tank. The nitrification liquid return pump is connected to an extracellular polymer stripping and carbon release device. The output end of the extracellular polymer stripping and carbon release device is connected to the input end of the anoxic tank. The output end of the secondary sedimentation tank is connected to the input end of the anoxic tank through a second sludge return pump.

4. The apparatus according to claim 1, wherein: The emulsifying pump is a three-stage emulsifying pump.

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