Biochemical decontamination wastewater treatment system

Abstract

The utility model relates to the field of decontamination, and discloses a biochemical decontamination wastewater treatment system which comprises a pretreatment unit and a filtering unit through which decontamination wastewater sequentially passes, the pretreatment unit comprises a conditioning tank and a reaction tank, and at least two automatic feeding mechanisms are arranged on each of the conditioning tank and the reaction tank; the automatic feeding mechanism on the conditioning tank can respectively feed a defoaming agent and a flocculating agent, the automatic feeding mechanism on the reaction tank can respectively feed a reducing agent and a capturing agent, a dehydration part is arranged between the pretreatment unit and the filtering unit, and the filtering unit comprises a physical filtering part and a membrane filtering part. The treatment system provided by the utility model has a good treatment effect on decontamination wastewater with high effective chlorine content and high COD (Chemical Oxygen Demand) content.

Description

Technical Field

[0001] The utility model relates to the field of cleaning and disinfection, in particular to a biochemical cleaning and disinfection wastewater treatment system. Background Art

[0002] Decontamination refers to the measures to disinfect and eliminate contamination of personnel, equipment, supplies, fortifications, roads, etc. that are contaminated with biochemical and biological warfare agents. The purpose is to avoid or reduce damage to the infected troops and enable the contaminated equipment, supplies, etc. to be used normally. In order to meet the disinfection of biochemical and biological warfare agents under various complex conditions, the disinfectants currently developed and put into use have the characteristics of strong targeting, strong corrosiveness, and difficulty in natural degradation. In the process of decontamination of contaminated equipment and fortifications in biochemical accidents or war emergency rescue operations, a large amount of highly corrosive, high COD content, and high load concentration hardness chemical wastewater will be generated during the decontamination process, causing environmental pollution. Therefore, these chemical decontamination wastewaters need to be treated with reasonable processes to minimize or eliminate the potential dangers they bring.

[0003] At present, domestic research institutes have conducted research on nuclear decontamination wastewater treatment processes and systems. For example, the patent authorization announcement number CN105719717B discloses a nuclear decontamination wastewater treatment process and system. The system mainly consists of a coagulation integrated reactor, a filter, a multi-media high-efficiency adsorption tank, a reverse osmosis membrane, an ion exchange softening protector, etc., which is used to solve the problem of nuclear decontamination wastewater treatment. It can perform deep treatment on radionuclide wastewater and decontamination wastewater at the same time under different load conditions. The effluent index can meet the water replenishment reuse or standard discharge in the decontamination process, but this type of wastewater The treatment system is mainly used for 01 disinfectant, i.e., three-in-two disinfectant, and is used to treat wastewater with a high chlorine content. The treatment effect on the in-service 03 disinfectant is poor. The disinfection wastewater produced by the 03 disinfectant has the characteristics of high chlorine content and high COD content. Microorganisms are conventionally used to treat the wastewater to reduce the COD content. However, microorganisms cannot survive in wastewater with high chlorine content, so the conventional method has a poor treatment effect on the disinfection wastewater of this type of disinfectant. Therefore, it is necessary to provide a treatment system with good treatment effect on disinfection wastewater with high effective chlorine content and high COD content. Utility Model Content

[0004] The utility model aims to provide a biochemical disinfection wastewater treatment system, so as to provide a treatment system with good treatment effect for disinfection wastewater containing high effective chlorine content and high COD content.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a biochemical disinfection wastewater treatment system, including a pretreatment unit and a filtration unit through which the disinfection wastewater passes in sequence, the pretreatment unit including a conditioning tank and a reaction tank, and the conditioning tank and the reaction tank are each provided with at least two automatic feeding mechanisms, the automatic feeding mechanism on the conditioning tank can respectively feed defoaming agent and flocculant, and the automatic feeding mechanism on the reaction tank can respectively feed reducing agent and scavenger, a dehydration part is provided between the pretreatment unit and the filtration unit, and the filtration unit includes a physical filtration part and a membrane filtration part.

[0006] The beneficial effects of this program are:

[0007] The conditioning tank is equipped with an automatic feeding mechanism for defoaming agent and flocculant. The defoaming agent can eliminate bubbles in the wastewater to prevent bubbles from affecting subsequent treatment steps. The flocculant causes organic matter to condense into larger flocs, which is convenient for subsequent sedimentation and filtration treatment, and helps to reduce the concentration of suspended solids and some organic pollutants in the wastewater, thereby reducing the burden on subsequent treatment units.

[0008] The reaction tank is equipped with an automatic feeding mechanism for adding reducing agents and scavenging agents. The reducing agent reduces the chlorine in the wastewater to a more stable form, improving the efficiency of subsequent filtration treatment. The scavenging agent increases the molecular weight of organic molecules, making them easier to filter out, effectively reducing the chlorine content in the wastewater, protecting subsequent treatment equipment and improving the overall efficiency of wastewater treatment.

[0009] The pretreatment unit in this technical solution can quickly reduce the effective chlorine in the wastewater and remove most of the organic matter, significantly reduce the oxidizability and turbidity of the wastewater, and protect the membrane filtration part from being contaminated by large particles; the membrane filtration part further purifies the wastewater through ultrafiltration or reverse osmosis membrane, removes tiny particles, soluble organic matter, ions and other pollutants, and can make the effluent meet higher purification standards, and ultimately make the wastewater meet the safe discharge or reuse standards, and can effectively treat the disinfection wastewater generated by 03 disinfectant. The treatment system can effectively remove chlorine compounds and organic matter in 03 disinfectant, solving the problem that the existing technology cannot efficiently treat this type of disinfection wastewater.

[0010] Preferably, as an improvement, the dehydration section includes a solid-liquid separation device and a collecting tank arranged at the liquid outlet of the solid-liquid separation device, the quartz sand filter separates the concentrated waste liquid and the clear waste liquid, the concentrated waste liquid outlet is connected to the collecting tank, and the clear waste liquid outlet is connected to the membrane filtration section.

[0011] The beneficial effects are: by setting up a solid-liquid separation device, the solid suspended matter in the wastewater can be fully separated from the liquid, and by applying pressure and mechanical extrusion, the water in the wastewater can be efficiently removed, which not only reduces the volume of the wastewater, but also greatly reduces the load of the subsequent treatment unit, that is, avoids the influence of large particle impurities on the filtration process, thereby ensuring the stability and quality of the water outlet of the filtration unit, and the concentrated waste liquid outlet is connected to the collection tank for quartz sand filtration again, ensuring maximum utilization efficiency and reducing the final waste discharge.

[0012] Preferably, as an improvement, the physical filtration unit includes a quartz sand filter and a backwashing device for backwashing the quartz sand filtration device, and is provided with a water supply pipe and a return pipe connected to the backwashing device, and the return pipe is connected to the collection tank.

[0013] The beneficial effects are: after many attempts by the inventors, by using quartz sand filters, the COD content in the wastewater can be effectively reduced, and the organic matter content in the wastewater can be further reduced, providing cleaner water quality for subsequent treatment units. By setting up backwashing equipment, the quartz sand filter can be backwashed to avoid excessive suspended matter adhering to the filter, which leads to reduced filtration efficiency or clogging of the filter. The return pipe is connected to the collection tank so that the backwash wastewater passes through the filtration system again, maximizing the utilization of the wastewater generated by the treatment.

[0014] Preferably, as an improvement, the membrane filtration unit includes a DTRO / NF membrane group and an ion exchange softening protector.

[0015] The beneficial effects are: DTRO membrane can effectively remove dissolved salts and other tiny particles in wastewater, ensuring high purity of the effluent. For the complex chemicals and pollutants that may be contained in biochemical disinfection wastewater, DTRO membrane can provide deep purification effect; NF membrane can separate and remove hardness components in wastewater, such as calcium and magnesium ions, and reduce specific types of organic pollutants and multivalent ions. It has lower operating pressure and higher permeability, providing high-quality effluent for subsequent treatment or direct discharge.

[0016] Preferably, as an improvement, a diaphragm pump is further included, and the physical filtration part and the reaction tank are connected via the diaphragm pump.

[0017] The beneficial effects are: various reagents are added to the pretreatment unit, and the diaphragm pump is often made of corrosion-resistant materials, which is suitable for transporting wastewater containing corrosive chemicals. The chemical resistance of the diaphragm pump enables it to maintain stable operation during long-term use, reducing equipment wear and corrosion, thereby extending the service life of the pump.

[0018] Preferably, as an improvement, a flow meter is provided between the diaphragm pump and the dehydration part.

[0019] Preferably, as an improvement, a concentrated water tank is provided at the outlet of the membrane filtration unit, and the concentrated water tank is connected to the collection tank.

[0020] The beneficial effect is that the concentrated water tank can collect the separated high-concentration wastewater, and the concentrated water tank is connected to the collection tank to achieve re-filtration.

[0021] Preferably, as an improvement, the outer shell of the quartz sand filter is made of glass fiber reinforced plastic.

[0022] The beneficial effects are: since biochemical disinfection wastewater is highly corrosive, the fiberglass material is corrosion-resistant, which can improve the stability of system operation and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the external structure of the conditioning tank and reaction tank according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods:

[0026] The figure marks in the drawings of the specification include: conditioning tank 1, reaction tank 2, automatic feeding mechanism 3, control valve 4, diaphragm pump 5, flow meter 6, solid-liquid separation device 7, collection tank 8, backwash equipment 9, precision filter 10, high-pressure pump 11, DTRO / NF membrane group 12, ion exchange softening protector 13, concentrated water tank 14, quartz sand filter 15, connection interface 16, and reinforcement rib 17.

[0027] Example

[0028] The embodiment is basically as follows Figure 1-Figure 2 As shown, Figure 1 The biochemical disinfection wastewater treatment system shown includes a pretreatment unit and a filtration unit through which the disinfection wastewater passes in sequence. The pretreatment unit includes a conditioning tank 1 and a reaction tank 2. Both the conditioning tank 1 and the reaction tank 2 are provided with at least two automatic feeding mechanisms 3. In this embodiment, both the conditioning tank 1 and the reaction tank 2 are provided with two automatic feeding mechanisms 3. The automatic feeding mechanisms 3 on the conditioning tank 1 are used for quantitatively feeding defoaming agents and flocculants, respectively. The automatic feeding mechanisms 3 on the reaction tank 2 are used for quantitatively feeding reducing agents and capturing agents, respectively. A dehydration section is provided between the pretreatment unit and the filtration unit. The filtration unit includes a physical filtration section and a membrane filtration section to treat the wastewater. The conditioning tank 1 and the reaction tank 2 are as shown Figure 2 As shown, two connection interfaces 16 are provided above the conditioning tank 1 and the reaction tank 2, and the connection interfaces 16 are used to connect with the automatic feeding mechanism 3. The conditioning tank 1 and the reaction tank 2 are made of polyethylene (PE). There are multiple fixed around the conditioning tank 1 and the reaction tank 2. Figure 2 The reinforcement ribs 17 shown in the figure strengthen the structural strength of the processing tank 1 and the reaction tank 2. The cleaning wastewater treated in this technical solution is highly corrosive, and ordinary steel can easily react chemically with it, resulting in a short service life. Therefore, the use of PE can avoid the above problems. At the same time, the lighter weight facilitates vehicle transportation and improves mobility.

[0029] In this embodiment, the dehydration part includes a solid-liquid separation device 7 and a collection tank 8 arranged at the liquid outlet of the solid-liquid separation device 7. The separated solid waste is collected using a waste bag. The solid-liquid separation device 7 is connected to the filtration unit. The solid-liquid separation device 7 in this embodiment is a stacked dehydrator, which can fully separate the solid suspended matter in the wastewater from the liquid. By applying pressure and mechanical extrusion, it can efficiently remove the water in the wastewater, which not only reduces the volume of the wastewater, but also greatly reduces the load of the subsequent treatment unit, that is, avoids the influence of large particle impurities on the filtration process, thereby ensuring the stability and quality of the water outlet from the filtration unit. The physical filtration part includes a quartz sand filter 15, a high-pressure pump 11, a precision filter 10 and a backwashing device 9 for backwashing the quartz sand filtration equipment. The collecting tank 8 is connected to the quartz sand filter 15 through the high-pressure pump 11. The quartz sand filter 15 separates concentrated waste liquid and clear waste liquid. Since the volume of concentrated waste liquid filtered out by the quartz sand filter 15 is still large, the concentrated waste liquid is returned to the collecting tank 8 through the pipeline for re-filtration to reduce the volume of wastewater. The clearer waste liquid enters the DTRO / NF membrane group 12 through the high-pressure pump 11 and the precision filter 10. The high pressure provided by the high-pressure pump 11 causes the wastewater to pass through the DTRO / NF membrane group 12 in sequence under the action of pressure. A water supply pipeline and a return water pipeline are connected to the backwashing device 9, and the return water pipeline is connected to the collecting tank 8 for circulation.

[0030] The outer shell of the quartz sand filter 15 is made of fiberglass. After many attempts by the inventor, the COD content in the wastewater can be effectively reduced by using the quartz sand filter 15, and the organic matter content in the wastewater is further reduced, providing cleaner water quality for subsequent treatment units. By setting up a backwash device 9, the quartz sand filter 15 can be backwashed to avoid excessive suspended matter adhering to the filter, which leads to reduced filtration efficiency or clogging of the filter. The return pipe is connected to the collection tank 8, so that the backwash wastewater passes through the filtration system again, maximizing the utilization of the wastewater generated by the treatment; biochemical disinfection wastewater is highly corrosive, and the fiberglass material is more stable and corrosion-resistant, which can help ensure the efficiency of filtration, improve the stability of system operation, and extend the service life of the equipment.

[0031] The membrane filtration section includes a DTRO / NF membrane group 12 and an ion exchange softening protector 13. The DTRO membrane can effectively remove dissolved salts and other tiny particles in the wastewater to ensure the high purity of the effluent. For the complex chemicals and pollutants that may be contained in the biochemical disinfection wastewater, the DTRO membrane can provide a deep purification effect; the NF membrane can separate and remove hardness components in the wastewater, such as calcium and magnesium ions, and reduce specific types of organic pollutants and multivalent ions. It has a lower operating pressure and higher permeability, providing high-quality effluent for subsequent treatment or direct discharge. The outlet of the membrane filtration section is provided with a concentrated water tank 14 for collecting the separated high-concentration wastewater. The concentrated water tank 14 is connected to the collection tank 8 to re-process the wastewater in the concentrated water tank 7. In this technical solution, the collection tank 8, the concentrated water tank 14 and the connecting pipes between the various components are all made of polyethylene.

[0032] The system also includes a diaphragm pump 5, which connects the physical filtration section and the reaction tank 2. The diaphragm pump 5 pumps the wastewater from the physical reaction tank 2 to the physical filtration section for filtration. Various reagents are added to the pretreatment unit. The diaphragm pump 5 is often made of corrosion-resistant materials and is suitable for transporting wastewater containing corrosive chemicals. The chemical resistance of the diaphragm pump 5 enables it to maintain stable operation during long-term use, reducing wear and corrosion of the equipment, thereby extending the service life of the pump. A flow meter 6 is provided between the diaphragm pump 5 and the dehydration section. In this embodiment, control valves 4 are provided between the pretreatment unit and the diaphragm pump 5, between the diaphragm pump 5 and the solid-liquid separation device 7, and between the high-pressure pump 11 and the DTRO / NF membrane group 12 to achieve a high degree of control over the wastewater flow process.

[0033] The specific implementation process is as follows:

[0034] Conditioning tank 1 is equipped with an automatic feeding mechanism 3 for feeding defoaming agents and flocculants. The defoaming agent eliminates bubbles in the wastewater to prevent them from affecting subsequent reactions and filtration. The flocculant causes organic matter to condense into larger flocs, which facilitates subsequent precipitation and filtration treatments and helps reduce the concentration of suspended solids and some organic pollutants in the wastewater, thereby reducing the burden on subsequent treatment units. Reaction tank 2 is equipped with an automatic feeding mechanism 3 for feeding reducing agents and scavenging agents. The reducing agent reduces the chlorine in the wastewater to a more stable form, improving the efficiency of subsequent filtration treatment. The scavenging agent increases the molecular weight of organic molecules, making them easier to filter out, effectively reducing the chlorine content in the wastewater, protecting subsequent treatment equipment, and improving the overall efficiency of wastewater treatment.

[0035] The pretreatment unit can quickly reduce the available chlorine in the wastewater and remove most of the organic matter, significantly reducing the oxidizability and turbidity of the wastewater, and protecting the membrane filtration part from being contaminated by large particles; the membrane filtration part further purifies the wastewater through ultrafiltration or reverse osmosis membranes, removing tiny particles, dissolved organic matter, ions and other pollutants, so that the effluent can meet higher purification standards and ultimately meet the safe discharge or reuse standards of the wastewater.

[0036] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Biochemical disinfection wastewater treatment system, characterized by: It includes a pretreatment unit and a filtration unit through which the washing and disinfection wastewater passes in sequence. The pretreatment unit includes a conditioning tank and a reaction tank. Both the conditioning tank and the reaction tank are provided with at least two automatic feeding mechanisms. The automatic feeding mechanism on the conditioning tank can respectively feed defoaming agent and flocculant, and the automatic feeding mechanism on the reaction tank can respectively feed reducing agent and scavenger. A dehydration part is provided between the pretreatment unit and the filtration unit. The filtration unit includes a physical filtration part and a membrane filtration part.

2. The biochemical disinfection wastewater treatment system according to claim 1, characterized in that: The dehydration part includes a solid-liquid separation device and a collecting tank arranged at the liquid outlet of the solid-liquid separation device. The quartz sand filter separates concentrated waste liquid and clean waste liquid. The concentrated waste liquid outlet is connected to the collecting tank, and the clean waste liquid outlet is connected to the membrane filtration part.

3. The biochemical disinfection wastewater treatment system according to claim 2, characterized in that: The physical filtration part includes a quartz sand filter and a backwashing device for backwashing the quartz sand filtration device. A water supply pipeline and a return pipeline are provided to communicate with the backwashing device, and the return pipeline is connected to the collection tank.

4. The biochemical disinfection wastewater treatment system according to claim 3, characterized in that: The membrane filtration unit includes a DTRO / NF membrane group and an ion exchange softening protector.

5. The biochemical disinfection wastewater treatment system according to claim 4, characterized in that: It also includes a diaphragm pump, and the physical filtration part and the reaction tank are connected through the diaphragm pump.

6. The biochemical disinfection wastewater treatment system according to claim 5, characterized in that: A flow meter is provided between the diaphragm pump and the dehydration section.

7. The biochemical disinfection wastewater treatment system according to claim 6, characterized in that: A concentrated water tank is provided at the outlet of the membrane filtration unit, and the concentrated water tank is communicated with the collection tank.

8. The biochemical disinfection wastewater treatment system according to claim 7, characterized in that: The shell of the quartz sand filter is made of fiberglass.

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