Unpowered automatic proportioning polyhydric sugar alcohol wastewater pretreatment device

Abstract

This invention relates to the field of industrial organic wastewater pretreatment technology, and proposes a non-powered automatic proportioning device for pretreatment of polysaccharide alcohol wastewater. The device incorporates a proportioning component on the wastewater inlet pipe. This component includes an axially movable proportioning slide and a linked Venturi channel. The proportioning slide contains a proportioning pipe connected to the drug supply chamber. The polysaccharide alcohol wastewater flows through the Venturi channel under its own transport pressure, creating a negative pressure at the throat and driving the proportioning slide to displace. This simultaneously opens the wastewater passage and draws in the treatment solution, achieving non-powered automatic proportioning and premixing under high-viscosity wastewater conditions. The device uses a three-way valve to switch between direct discharge and automatic proportioning modes, improving the stability and uniformity of water-chemical mixing during the pretreatment of high-viscosity polysaccharide alcohol wastewater without requiring external power for dosing.

Description

Technical Field

[0001] This invention relates to the field of industrial organic wastewater treatment technology, and in particular to a non-powered automatic proportioning pretreatment device for polysaccharide alcohol wastewater. Background Technology

[0002] Plant-based polysaccharides are typically produced from plant polysaccharides such as corn starch and tapioca starch through liquefaction, saccharification, and hydrogenation reactions. They are mixtures containing sorbitol, maltitol, mannitol, and higher sugar alcohols in varying proportions. The production and refining of polysaccharides usually requires unit operations such as filtration, decolorization, ion exchange, membrane separation, electrodialysis, and evaporation concentration, which correspondingly generate process wastewater with a high organic load.

[0003] Compared to general alcohol-containing wastewater, polyol production wastewater exhibits significantly different physicochemical properties. This type of wastewater primarily originates from substandard polyol products, mother liquor, and equipment cleaning fluids. It contains a high mass fraction of polyols and their degradation byproducts, and its chemical oxygen demand (COD) is typically high. Furthermore, due to the strong hydrogen bonding formed by the polyhydroxyl structure, the wastewater viscosity is significantly higher than that of conventional organic wastewater, exhibiting high flow resistance and low fluidity under normal temperature conditions. In addition, the introduction of alkalis, acids, and salts during the process results in the wastewater containing both inorganic salts and various organic impurities, forming a complex system with high COD and high viscosity.

[0004] In engineering practice, polyol wastewater typically requires pH adjustment and the addition of coagulants and flocculants before entering treatment units such as coagulation sedimentation, flotation, biological treatment, or advanced oxidation. Existing pretreatment methods often employ metering pumps combined with mixing tanks, or use static mixers, T-junctions, or Venturi injectors in pipelines to promote water-chemical contact. However, these technical solutions are primarily designed for low-viscosity water bodies or general organic wastewater, and have significant limitations in handling high-viscosity polyol organic wastewater.

[0005] Specifically, high-viscosity polysaccharide alcohol wastewater tends to flow in laminar or weakly turbulent conditions within pipelines, making it difficult to achieve stable and uniform proportional mixing of chemicals before they enter the tank. Online dosing systems based on flow meters and metering pumps are highly sensitive to flow fluctuations and viscous adhesion, resulting in high operating and maintenance costs. Traditional Venturi-type non-powered liquid suction structures typically rely on low flow resistance and high flow velocity conditions, making it difficult to create a stable negative pressure in high-viscosity polysaccharide alcohol wastewater. This leads to frequent interruptions in the chemical suction process, making it difficult to meet continuous operation requirements. These problems further result in insufficient water-chemical premixing, increasing the load and energy consumption of subsequent treatment units.

[0006] As polysaccharide alcohol products develop towards electronic and high-end pharmaceutical grades, manufacturers are placing higher demands on the stability and controllability of wastewater pretreatment, urgently requiring stable ratios and uniform premixing of wastewater and reagents at the source. However, current technology lacks a dedicated pretreatment device that can automatically draw in reagents, proportionally mix them, and premix them before they enter the tank, taking into account the physical properties of high-viscosity organic wastewater from polysaccharide alcohols, without requiring external energy.

[0007] Therefore, it is necessary to develop a non-powered automatic proportioning pretreatment device that is simple in structure, reliable in operation, and suitable for high-viscosity organic wastewater containing polysaccharide alcohols, in order to improve the stability of water-chemical mixing under high-viscosity wastewater conditions, reduce the operating load of subsequent treatment units, and enhance the engineering applicability of the overall pretreatment process. Summary of the Invention

[0008] This invention addresses the technical problems of high flow resistance, difficulty in stabilizing reagent dosage, and the inability of traditional non-powered dosing structures to operate continuously in high-viscosity systems during the pretreatment of polysaccharide alcohol-based high-viscosity organic wastewater. It proposes a non-powered automatic proportioning pretreatment device suitable for polysaccharide alcohol-based high-viscosity organic wastewater.

[0009] The core of this invention lies in the structural linkage between the Venturi suction structure, the axially movable proportioning slide, and the opening and closing orifice. This allows the wastewater flow state and the drug suction process to respond in a coordinated manner, enabling stable automatic proportioning and pre-mixing even under high-viscosity wastewater conditions, relying solely on the wastewater's own pressure. This device, without requiring an external power source or independent dosing power, utilizes the pressure difference generated during wastewater transport to achieve automatic drug suction and proportional proportioning. Furthermore, it ensures preliminary mixing of wastewater and drug before they enter the mixing device, thereby improving the stability of water-drug mixing under high-viscosity wastewater conditions and reducing the operating load on subsequent treatment units.

[0010] To achieve the above objectives, the present invention provides a pretreatment device suitable for high-viscosity organic wastewater containing polysaccharide alcohols, comprising a proportioning component and a stirring device. The proportioning component is disposed on the inlet side of the stirring device and is used to automatically proportion and premix the wastewater and the treatment solution before the wastewater enters the stirring device.

[0011] The mixing components include an input mechanism and a drug dispensing mechanism.

[0012] The input mechanism includes a main pipe, a three-way valve, and a proportioning slide. The main pipe consists of an input pipe and a functional pipe, with the three-way valve fixedly installed at the connection between the input pipe and the functional pipe. One end of the input pipe is connected to a pressure-stabilizing pump, allowing pre-filtered high-viscosity organic wastewater (containing polysaccharides) to enter the main pipe under pressure. The proportioning slide is inserted into the functional pipe, which is fixedly installed on the side of the mixing device's tank via a connecting seat. The axial end of the input pipe is a sealing structure.

[0013] The drug supply mechanism includes a drug storage tank, a sealing cap, and a drug supply base. The drug storage tank is fixedly installed on the top of the drug supply base, and the sealing cap is detachably installed on the top of the drug storage tank. The top of the drug supply base is fixedly installed on the bottom of the functional pipe, and its bottom is fixedly installed on the base of the stirring device.

[0014] Furthermore, the bottom of the functional pipeline is provided with a manifold, one end of which is connected to the end of the functional pipeline, and the other end is connected to the inside of the tank of the stirring device, for introducing the automatically proportioned water-medicine mixture into the stirring device.

[0015] Furthermore, the front end of the proportioning slide is provided with a pressure plate, and the side of the pressure plate is provided with a reset top spring. The two ends of the reset top spring abut against the side of the pressure plate and the inner wall of the functional pipe, respectively, so that the proportioning slide will generate axial displacement when the wastewater flow pressure changes, and automatically reset in the state of no flow.

[0016] Furthermore, the proportioning slide is provided with a Venturi channel, which includes a contraction section, a throat, and a diffusion section in sequence. When the polysaccharide alcohol high-viscosity organic wastewater flows through the Venturi channel under pressure, a low-pressure zone is formed at the throat.

[0017] Furthermore, the bottom of the proportioning slide is provided with a proportioning tube, the inside of the drug supply seat is provided with a drug supply chamber, the bottom of the proportioning tube is inserted into the drug supply chamber, and its top end is connected to the throat of the Venturi channel, so as to use the negative pressure formed by the throat to draw in the treatment liquid in the drug supply chamber, thereby realizing the automatic proportioning and mixing of wastewater and drug liquid without power.

[0018] Furthermore, the proportioning slide has an opening and closing hole at the bottom near the diffuser section. When there is no wastewater flowing in the main pipe, the opening and closing hole is misaligned with the pipe opening at the top of the manifold under the action of the reset top spring, thereby blocking the connection between the functional pipe and the manifold.

[0019] Furthermore, the main pipeline also includes a direct discharge pipeline, the two ends of which are connected to the bottom of the three-way valve and the bottom of the manifold, respectively, so that the polysaccharide alcohol-based high-viscosity organic wastewater can bypass the proportioning component and directly enter the stirring device, thereby realizing the switching between direct discharge mode and automatic proportioning mode.

[0020] Furthermore, the bottom and top of the side wall of the medicine storage tank are respectively provided with a supply pipe and a sealing pipe. Both the supply pipe and the sealing pipe are inserted into the medicine supply chamber, and the bottom heights of the proportioning pipe, the supply pipe and the sealing pipe are arranged in ascending order.

[0021] Furthermore, the outside of the drug supply seat is provided with an air pressure balance channel, which is used to connect the drug supply chamber with the outside to maintain stable pressure inside the drug supply chamber and ensure that the treated drug solution can be continuously drawn in under high viscosity conditions.

[0022] (1) Stable automatic dosing without external power is achieved in the case of high-viscosity organic wastewater containing polysaccharide alcohols. This invention achieves stable automatic dosing without external power by linking the axially movable dosing slide with the Venturi channel, so that the wastewater flow state and the drug absorption process form a coordinated response. Under high viscosity and high flow resistance conditions, it can still rely on the wastewater's own pressure to form a stable negative pressure and continuously absorb liquid. This effect breaks through the limitations of traditional non-powered Venturi dosing structures on low-viscosity media, which is not something that those skilled in the art could reasonably expect based on existing technology.

[0023] (2) To achieve synchronous proportioning and premixing of wastewater and chemical solution before entering the tank, so as to avoid local concentration imbalance in high viscosity system. The chemical solution is drawn in and transported synchronously with the wastewater before the wastewater enters the stirring device, so that the water and chemical solution are mixed in the pipeline to complete the initial homogenization, effectively reducing the local high concentration area and concentration gradient problem that is easy to occur when high viscosity polysaccharide alcohol wastewater is directly added to the tank.

[0024] (3) The premixing mechanism reduces the subsequent stirring load and improves the operational stability of the pretreatment process. Since the wastewater and the drug solution have been pre-mixed before entering the tank, the stirring device is mainly used for homogenization rather than forced dispersion, thereby reducing the stirring load, reducing energy consumption and improving the long-term operational stability of the system in the treatment of polysaccharide alcohol high viscosity wastewater.

[0025] (4) It has the ability to switch between direct discharge and automatic proportioning modes to adapt to the fluctuation of polyol wastewater quality and changes in operational requirements. By setting up a three-way valve and a direct discharge pipeline, the switching between direct discharge mode and automatic proportioning mode can be realized without changing the structure of the device, thereby enhancing the engineering adaptability of the device to polyol wastewater of different concentrations and different treatment stages. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0027] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0028] In the attached diagram:

[0029] Figure 1 A schematic diagram of the structure of the present invention is shown.

[0030] Figure 2 A schematic diagram of the internal structure of the present invention in its straight-lined state is shown.

[0031] Figure 3 The present invention is shown. Figure 2 Enlarged structural diagram of part A in the middle.

[0032] Figure 4 A schematic diagram of the internal structure of the input structure of the present invention after disassembly is shown.

[0033] Figure 5 A schematic diagram of the disassembled drug storage mechanism of the present invention is shown.

[0034] Figure 6 A schematic diagram of the internal structure of the present invention in the formulation state is shown.

[0035] Figure 7 The present invention is shown. Figure 6 Enlarged structural diagram of part B in the middle.

[0036] Figure 8 This diagram shows the internal structure of the drug supply chamber when the liquid level inside the sealing tube is blocked.

[0037] Figure 9 This diagram shows the internal structure of the drug supply chamber of the present invention when the liquid level inside the sealed tube is not blocked (automatic drug replenishment).

[0038] List of reference numerals

[0039] 1. Input mechanism; 101. Input pipe; 102. Functional pipe; 1021. Manifold pipe; 103. Direct discharge pipe; 104. Three-way valve; 105. Proportioning slide; 1051. Pressure plate; 1052. Return spring; 1053. Contraction section; 1054. Throat; 1055. Diffusion section; 1056. Proportioning pipe; 1057. Opening and closing orifice;

[0040] 2. Drug supply mechanism; 201. Drug storage tank; 2011. Supply pipe; 2012. Sealing pipe; 202. Sealing cap; 203. Drug supply seat; 2031. Drug supply chamber; 2032. Air pressure balance channel;

[0041] 3. Stirring device.

[0042] It should be noted that:

[0043] Figure 2 and Figure 6 The solid black arrows indicate the flow path of the wastewater containing polysaccharide alcohols, while the hollow black arrows indicate the flow path of the liquid medicine.

[0044] Figure 9 The solid black arrows indicate the flow path of the liquid medicine, while the hollow black arrows indicate the flow path of the gas. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1 (see Figures 1-9 )

[0047] like Figure 1 As shown, this embodiment provides a pretreatment device suitable for high-viscosity organic wastewater containing polysaccharide alcohols, including a proportioning component and a stirring device 3. The proportioning component is located on the inlet side of the stirring device 3 and is used to achieve automatic intake, non-powered proportioning, and simultaneous premixing of the treatment solution before the wastewater enters the stirring device 3.

[0048] Input mechanism 1 includes input pipe 101, functional pipe 102, three-way valve 104, and proportioning slide 105 (see...). Figure 1 , Figure 4 The functional pipeline 102 has a manifold 1021 at its bottom, which is connected to the stirring device 3; the main pipeline also has a straight discharge pipeline 103, which is connected to the three-way valve 104 and the manifold 1021 to form a straight discharge passage (see...). Figure 1 The drug supply mechanism 2 includes a drug storage tank 201, a sealing cap 202, and a drug supply base 203. The drug supply base 203 has a drug supply chamber 2031 inside and an air pressure balance channel 2032 outside to connect to the outside (see...). Figure 1 , Figure 5 The proportioning slide 105 has a pressure plate 1051 at its front end, which works in conjunction with a reset spring 1052; the proportioning slide 105 has a Venturi flow channel (contraction section 1053, throat 1054, diffuser section 1055) inside, and a proportioning pipe 1056 at its bottom, which is connected to the drug supply chamber 2031; the proportioning slide 105 has an opening and closing hole 1057 at the bottom end near the diffuser section 1055, which is used to cooperate with the top opening of the manifold 1021 to achieve on / off control (see...). Figure 2 , Figure 3 , Figure 6 , Figure 7 ).

[0049] When reagent mixing is not required, wastewater is introduced from the input pipe 101 into the direct discharge pipe 103 through the three-way valve 104. The wastewater then enters the manifold pipe 1021 through the direct discharge pipe 103 and is discharged into the stirring device 3. At this time, there is no driving pressure in the functional pipe 102 acting on the mixing slide 105. The mixing slide 105 is in the return position under the action of the reset top spring 1052, causing the opening and closing hole 1057 to be misaligned with the top opening of the manifold pipe 1021, thereby blocking the connection between the functional pipe 102 and the manifold pipe 1021 and preventing wastewater from accidentally entering the mixing passage.

[0050] When pretreatment of high-viscosity organic wastewater containing polysaccharides is required, the wastewater is introduced into the functional pipe 102 through the three-way valve 104 via the input pipe 101. The pressurized wastewater acts on the pressure plate 1051, driving the proportioning slide 105 to overcome the reset spring 1052 and generate axial displacement, aligning the opening / closing hole 1057 with the top opening of the manifold 1021, thus opening the flow path of "input pipe 101—functional pipe 102—proportioning slide 105—manifold 1021". After entering the proportioning slide 105, the wastewater flows through the venturi channel, forming a low-pressure zone at the throat 1054. This low-pressure zone acts on the supply chamber 2031 via the proportioning pipe 1056 connected to the throat 1054, causing the treatment solution in the supply chamber 2031 to be drawn in and mixed with the wastewater within the proportioning slide 105. The resulting water-chemical mixture then enters the stirring device 3 through the manifold 1021. Through the above-mentioned linkage process, the displacement of the proportioning slide 105 enables the passage to open and the liquid absorption condition to be met simultaneously, thereby achieving non-powered proportioning and pre-mixing in the tank under high viscosity conditions.

[0051] like Figure 8 , Figure 9 As shown, the bottom and top of the side wall of the drug storage tank 201 are respectively equipped with a supply pipe 2011 and a sealing pipe 2012, both of which are inserted into the drug supply chamber 2031. The bottom heights of the pipes of the mixing pipe 1056, supply pipe 2011, and sealing pipe 2012 are arranged in ascending order. The sealing cover 202 keeps the drug storage tank 201 in a closed state: when the liquid level in the drug supply chamber 2031 blocks the bottom of the sealing pipe 2012, a pressure balance is formed inside and outside the drug storage tank 201, and the supply pipe 2011 stops supplying liquid; when the liquid level in the drug supply chamber 2031 drops and the bottom of the sealing pipe 2012 is not blocked, outside air can enter the drug storage tank 201 through the air pressure balance channel 2032 and the sealing pipe 2012, causing the drug storage tank 201 to be unsealed and the supply pipe 2011 to automatically supply liquid to the drug supply chamber 2031 until the liquid level blocks the bottom of the sealing pipe 2012 again. The air pressure balance channel 2032 keeps the drug supply chamber 2031 in a non-sealed state, which is conducive to the continuous inhalation of the drug liquid and the maintenance of stable ratio.

[0052] In another embodiment, control valves may be provided on the supply pipe 2011 and the sealing pipe 2012 to close the passage during drug replenishment or maintenance, facilitating operation.

[0053] Example 2 (see Figure 1 , Figure 2 , Figure 6 , Figure 7 )

[0054] This embodiment illustrates the switching operation mode of the device of the present invention under fluctuating conditions of polyol wastewater. The viscosity, concentration, and treatment requirements of wastewater from different processes in polyol production vary: when the wastewater viscosity is low or no reagent addition is temporarily required, the three-way valve 104 selects a direct discharge path, allowing the wastewater to enter the manifold 1021 via the direct discharge pipe 103 and then be discharged into the stirring device 3; at this time, the proportioning slide 105 returns to its original position under the action of the reset top spring 1052, and the opening / closing hole 1057 is misaligned with the top opening of the manifold 1021, thereby blocking the proportioning path and preventing accidental aspiration of the reagent.

[0055] When the wastewater has high viscosity and requires pretreatment with chemicals, the three-way valve 104 selects the proportioning path, allowing the wastewater to enter the functional pipe 102 and driving the proportioning slide 105 to move. The opening / closing orifice 1057 is aligned and connected with the top opening of the manifold 1021. The wastewater flows through the Venturi channel, forming a low-pressure zone at the throat, and is then drawn into the chemical solution through the proportioning pipe 1056, achieving non-powered proportioning and tank premixing (its working mechanism is the same as in Example 1). Through the above method, the device can quickly switch between direct discharge and automatic proportioning modes to adapt to the operational needs of different treatment stages.

[0056] Example 3 (see Figure 1 , Figure 8 , Figure 9 )

[0057] This embodiment illustrates the stability of the drug supply mechanism in replenishment and absorption under continuous operation. During continuous operation, the drug solution in the drug supply chamber 2031 is gradually consumed as it is continuously drawn in according to the mixing ratio. When the liquid level drops to the bottom of the unsealed sealing pipe 2012, outside air enters the drug supply chamber 2031 through the air pressure balance channel 2032 and connects to the drug storage tank 201 through the sealing pipe 2012, causing the drug storage tank 201 to be unsealed and automatically replenishing the drug supply chamber 2031 through the replenishment pipe 2011. When the liquid level rises and the bottom of the sealing pipe 2012 is sealed again, replenishment stops and the maximum liquid level limit is formed.

[0058] In addition, the pressure balance channel 2032 keeps the drug supply chamber 2031 in a non-sealed state, thereby reducing the risk of liquid absorption interruption caused by negative pressure accumulation; the proportioning tube 1056 has the lowest tube end height, which is conducive to the drug being preferentially drawn into the bottom of the drug supply chamber 2031, improving the reliability of drug supply under continuous operation conditions.

Claims

1. A non-powered, automatic proportioning pretreatment device for polysaccharide alcohol wastewater, characterized in that, The system includes a proportioning component and a stirring device (3). The proportioning component is located on the water inlet side of the stirring device (3). The proportioning component includes an input mechanism (1) and a drug supply mechanism (2). The input mechanism (1) includes a main pipe, a three-way valve (104), and a proportioning slide (105). The main pipe consists of an input pipe (101) and a functional pipe (102). The three-way valve (104) is provided at the connection between the input pipe (101) and the functional pipe (102). One end of the input pipe (101) is used to connect to a pressure stabilizing pump to make the polyol high-viscosity organic... Wastewater enters the main pipeline under pressure; the proportioning slide (105) is inserted into the functional pipeline (102), which is fixedly installed on the side of the tank of the stirring device (3); the drug supply mechanism (2) includes a drug storage tank (201), a sealing cover (202), and a drug supply seat (203). The drug storage tank (201) is fixedly installed on the top of the drug supply seat (203), and the sealing cover (202) is detachably installed on the top of the drug storage tank (201). The drug supply seat (203) has a drug supply chamber (2031) inside. 3) The top end is fixedly installed at the bottom of the functional pipe (102); wherein, the bottom of the functional pipe (102) is provided with a manifold (1021) communicating with the inside of the stirring device (3), and the main pipe also includes a straight discharge pipe (103), which is connected to the three-way valve (104) and the manifold (1021) respectively; the proportioning slide (105) is provided with a Venturi flow channel inside, which includes a contraction section (1053), a throat (1054) and a diffusion section (1055), and the bottom of the proportioning slide (105) is provided with a supply The drug chamber (2031) is connected to the proportioning pipe (1056); when the polysaccharide alcohol high-viscosity organic wastewater enters the proportioning slide (105) through the functional pipe (102) and pushes the proportioning slide (105) to generate axial displacement, the proportioning slide (105) simultaneously opens the communication passage with the manifold pipe (1021), and the negative pressure formed at the throat (1054) of the Venturi channel acts on the drug supply chamber (2031) through the proportioning pipe (1056), thereby drawing in the treatment liquid in the drug supply chamber (2031) and mixing it with the wastewater before entering the stirring device (3) through the manifold pipe (1021); The front end of the proportioning slide (105) is provided with a pressure plate (1051), and a reset top spring (1052) is provided on one side of the pressure plate (1051). The two ends of the reset top spring (1052) abut against the inner wall of the pressure plate (1051) and the functional pipe (102) respectively, so as to drive the proportioning slide (105) to generate axial displacement under the action of wastewater pressure, and reset it when there is no wastewater pressure. The proportioning slide (105) has an opening and closing hole (1057) at the bottom near the diffuser section (1055). When the proportioning slide (105) is in the reset state, the opening and closing hole (1057) is misaligned with the top opening of the manifold (1021), thereby blocking the connection between the functional pipe (102) and the manifold (1021). The bottom and top of the side wall of the medicine storage tank (201) are respectively provided with a supply pipe (2011) and a sealing pipe (2012), and both the supply pipe (2011) and the sealing pipe (2012) are inserted into the medicine supply chamber (2031); The bottom heights of the proportioning pipe (1056), the supply pipe (2011), and the sealing pipe (2012) are arranged in ascending order; The external side of the drug supply seat (203) is provided with an air pressure balance channel (2032), which connects the drug supply chamber (2031) with the outside.

2. The pretreatment apparatus according to claim 1, characterized in that, By controlling the three-way valve (104), wastewater can be selectively discharged into the manifold (1021) via the direct discharge pipe (103) or the functional pipe (102), so as to switch between direct discharge mode and automatic proportioning mode.

3. The pretreatment apparatus according to any one of claims 1 to 2, characterized in that, The drug supply mechanism (2) maintains the supply of drug liquid and the stability of liquid level in the drug supply chamber (2031) under continuous operation conditions through the cooperation of the supply pipe (2011), the sealing pipe (2012) and the air pressure balance channel (2032).

4. The pretreatment apparatus according to claim 3, characterized in that, The polyol-based high-viscosity organic wastewater includes the polyol itself or the mother liquor, washing water, or reflux water generated during its production process.

5. The pretreatment apparatus according to claim 4, characterized in that, The dosing component does not have an independent dosing pump, electronic control actuator, or pneumatic drive mechanism during operation.

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