Overflow type rural decentralized water supply water quality purification and pipeline biological membrane culture device and method

Abstract

The invention provides an overflowing type rural decentralized water supply water quality purification and pipeline biological membrane culture device and method, and relates to the technical field of rural water supply.The device comprises a submersible pump, an electric control box is arranged on the submersible pump, a sand filter tank is arranged on one side of the submersible pump, and a water storage tank is arranged on the side, away from the submersible pump, of the sand filter tank; a surpassing pipe is connected between every two of the submersible pump, the sand filter tank and the water storage tank, and a stirring disinfection water tank is arranged on one side, far away from the sand filter tank, of the water storage tank. According to the device, turbidity removal pretreatment can be achieved, adjustment of technological parameters such as the water supply flow speed, the disinfection mode and pipes can be completed, in-situ collection of biological membranes is facilitated, and the rural distributed water supply water quality purification efficiency and the growth characteristics of the pipeline biological membranes under different single or combined disinfection modes such as chlorine, chlorine dioxide or ultraviolet rays can be more effectively studied; and the water supply device has the advantages of flexibility in application, simplicity and convenience in operation, small occupied area, high generalizability and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of rural water supply, and in particular to an overflow-type rural decentralized water supply water purification and pipeline biofilm cultivation device and method. Background Art

[0002] The latest GB5749-2022 "Sanitary Standard for Drinking Water" has deleted some water quality indicators and limits for small-scale centralized water supply and decentralized water supply in rural areas in GB5749-2006. Towns and rural areas implement unified drinking water hygiene standards, and put forward higher requirements for rural water supply quality assurance. Rural decentralized water supply is mostly based on groundwater, mountain spring water, mountain stream water, etc. as water sources, and the water quality is relatively good. The main problem is the presence of microbial contamination. The turbidity rises from time to time due to factors such as precipitation. Sedimentation and disinfection can be used to purify the water quality. However, at present, most of the decentralized water supply in rural areas is not disinfected or intermittently chlorinated, which often causes serious microbial contamination in the tap water of farmers, or excessive chlorination leads to the generation of a large number of harmful disinfection by-products. At present, there is a lack of applicable optimized disinfection processes for rural decentralized water supply water quality. At the same time, the growth and shedding of biofilms in water supply pipes can easily cause the growth of microorganisms in the water body, resulting in secondary pollution of water quality, resulting in serious excess of microbial indicators in tap water. Therefore, the coordinated control of water quality purification and biofilm growth in pipelines in rural decentralized water supply has attracted widespread attention.

[0003] Biofilm is an important transmission carrier of pathogenic microorganisms in water supply systems, and its growth and shedding are mainly affected by factors such as disinfection methods and dosages, water quality, pipe materials, and water flow rates. At present, the collection and analysis of biofilms in actual pipelines of rural decentralized water supply mainly rely on the dismantling of abandoned water supply pipelines, and there is a lack of a device and method for cultivating biofilms in rural decentralized water supply pipelines under different disinfection methods or different pipe materials. Most of the existing biofilm cultivation devices are laboratory simulation devices such as annular reactors and concentric circle reactors, or proportionally reduced circulating urban pipe network simulation devices, which are very different from the actual pipeline characteristics and are difficult to reflect the actual state of biofilm growth in actual rural water supply pipelines. Therefore, there is an urgent need for a flexible, convenient, popularizable, selectable multiple disinfection methods or pipe materials, adjustable flow rate, and practically applicable decentralized water supply water quality purification and pipeline biofilm cultivation device and method. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: comprising: a submersible pump, an electrical control box is arranged on the submersible pump, a sand filter tank is arranged on one side of the submersible pump, a water storage tank is arranged on the side of the sand filter tank away from the submersible pump, an override pipe is connected between each two of the submersible pump, a stirring and disinfecting water tank is arranged on the side of the water storage tank away from the sand filter tank, a valve is arranged on the side of the stirring and disinfecting water tank away from the water storage tank, a flow control pump is arranged between each two of the water storage tank, the stirring and disinfecting water tank and the valve, a concentrated disinfectant tank is arranged on the stirring and disinfecting water tank, a flow meter is arranged on the side of the valve away from the flow control pump, a flow-through water supply pipeline is arranged on the side of the flow meter away from the valve, and a flow-through ultraviolet disinfection lamp, a variety of slide biofilm sampling devices and sampling ports along the pipeline are respectively arranged on the flow-through water supply pipeline.

[0006] As a preferred embodiment, the multi-slide biofilm sampling device includes a water supply pipe connecting component, a circular biofilm slide is arranged on one side of the water supply pipe connecting component, square slides of different materials are arranged in the circular biofilm slide, a piston assembly is arranged on the side of the circular biofilm slide away from the water supply pipe connecting component, and a screw cap is arranged at one end of the piston assembly.

[0007] As a preferred embodiment, the circular biofilm carrier is made of different materials such as polyethylene or polyvinyl chloride, and its diameter is the same as the diameter of the hole on the side of the tube wall, and can also be vertically inserted into different square carriers; the piston assembly can be directly embedded in the circular biofilm carrier and fixed with a nut of the same size; the water supply pipe connecting component connects and fixes the first part and the second part to the side of the water supply pipe by threading; the multi-carrier biofilm sampling device is arranged along the water supply pipe every 5 to 10 meters. By changing the material of the biofilm carrier, when it is necessary to collect the biofilm, the piston assembly of the biofilm sampling device is directly disassembled to take out the in-situ biofilm circular carrier and square carriers of different materials.

[0008] As a preferred embodiment, a flow-through ultraviolet disinfection metal shell is provided at one end of the flow-through water supply pipe, a flow-through ultraviolet disinfection metal shell is provided in the flow-through ultraviolet disinfection glass protection cover, and a flow-through ultraviolet disinfection lamp is provided in the flow-through ultraviolet disinfection glass protection cover.

[0009] As a preferred embodiment, one ends of the two flow water supply pipes are respectively connected to the two ends of the same side of the flow-through ultraviolet disinfection metal shell, the flow-through ultraviolet disinfection lamp is installed in the flow-through ultraviolet disinfection glass protective cover, and one end of the flow-through ultraviolet disinfection glass protective cover is installed in the flow-through ultraviolet disinfection metal shell.

[0010] As a preferred embodiment, pebbles are arranged at the bottom of the sand filter tank, the lower part of the sand layer is 1-2 mm sand and gravel, accounting for 2 / 3 of the total sand and gravel, and the upper part of the sand layer is 0.2-0.5 mm sand and gravel, accounting for 1 / 3 of the total sand and gravel; the sand filter tank is equipped with an override pipe, and when the turbidity of the water source is less than 0.2NTU, the water is directly pumped into the water storage tank through the override pipe.

[0011] As a preferred embodiment, water enters the water tank from the top and mud is discharged from the bottom, and a water outlet is set at a distance of 0.5 meters from the bottom; a liquid level gauge is arranged in the water tank, and when the volume of water in the water tank is less than 1 / 3, the electrical control box automatically starts to control the submersible pump to pump water to fill it up; the disinfection water tank is equipped with a concentrated disinfectant tank, to which different disinfectants such as sodium hypochlorite and chlorine dioxide can be added to study the chemical disinfection effect, and the disinfectant is pumped in through a flow control pump, and the flow rate and concentration of the concentrated disinfectant can be adjusted by the flow control pump and the valve to ensure that the concentration of the disinfectant in the water outlet of the stirring disinfection water tank meets the requirements, and flow control pumps are arranged before and after the stirring disinfection water tank to control the hydraulic retention time to meet the required disinfection contact time; the stirring disinfection water tank has a built-in mixer to ensure full contact between the water body and the disinfectant through mechanical stirring.

[0012] As a preferred embodiment, the overflow water supply pipeline is 30 to 120 meters long and has a diameter of DN25, which is a common length and diameter for rural water supply. It is overflow and non-circulating, which is more in line with the actual rural water supply situation. The pipeline is compactly arranged in an S shape. The pipeline is made of polyethylene, polyvinyl chloride, polypropylene or stainless steel, and the pipelines are connected by threads. A variety of slide biofilm sampling devices and water intakes are arranged along the overflow water supply pipeline, and a faucet is set at the end of the pipeline. A flow control pump and a flow meter are arranged in front of the overflow water supply pipeline to adjust and monitor the flow rate of the water body in the water supply pipeline.

[0013] As a preferred embodiment, flow-through ultraviolet disinfection lamps are respectively arranged in front of the flow-through water supply pipe and at the faucet end, with an ultraviolet dose of 10 to 40 mJ / cm2, which can be turned on and off separately or simultaneously. A single ultraviolet or double ultraviolet disinfection method can be designed according to experimental research, and it can also be used in conjunction with a disinfectant to form a UV / chemical disinfection combination process, which is used to carry out research on water quality purification and pipeline biofilm growth control in rural decentralized water supply under comparison of multiple disinfection methods.

[0014] As a preferred implementation, the following steps are included:

[0015] S1. Fix the biofilm sampling device equipped with slides of different materials to the side of the water supply pipe and check for water leakage;

[0016] S2. Select water supply pipes of different materials, connect and fix them section by section through threaded ports, and check for water leakage;

[0017] S3. Fix and install the flow-through ultraviolet lamps in front of the water supply pipe and at the faucet end and the water intake along the way;

[0018] S4. Setting the control mode of the water tank level gauge through the electrical control box to realize automatic or manual control of the water tank water level;

[0019] S5. According to the turbidity of the source water and the specific experimental requirements, choose whether to filter the water through sand filtration or to directly feed the water into the water storage tank through the sand filter tank bypass pipe;

[0020] S6. Connect the stirring disinfection water tank and the concentrated disinfection liquid tank in a fixed manner, select whether to add disinfectant, the type and dosage of disinfectant, and adjust the disinfection contact time and the disinfectant concentration in the effluent water by adjusting the flow rate of the stirring disinfection water tank inlet pump and the concentrated disinfection liquid tank;

[0021] S7, adjusting the flow control pump and valve, and determining the flow rate of the water in the overflow water supply pipeline by means of a flow meter;

[0022] S8. According to the specific use requirements, choose whether to add disinfectant, whether to start the ultraviolet lamp, and select the specific disinfection method, including single chemical disinfection, single ultraviolet disinfection, double ultraviolet disinfection, and ultraviolet / chemical disinfection combined process, and determine the type and dosage of disinfectants and other parameters, so as to realize the control research of water quality purification and biofilm growth characteristics under different disinfection methods;

[0023] S9. Start the device, supply water continuously, and regularly take tap water samples and water samples along the way to analyze changes in water quality;

[0024] S10. Regularly remove the biofilm sampling device to obtain in-situ cultured biofilms grown at different flow rates, different disinfection methods, different pipe materials or different pipeline positions, and then analyze the formation process and growth characteristics of the biofilm.

[0025] Compared with the prior art, the advantages and positive effects of the present invention are:

[0026] The present invention can not only realize turbidity removal pretreatment, but also complete the adjustment of process parameters such as water supply flow rate, disinfection method, pipe material, etc., and is convenient for in situ collection of biofilms. It can more effectively study the water purification efficiency of rural decentralized water supply and the growth characteristics of pipeline biofilms under different single or combined disinfection methods such as chlorine, chlorine dioxide or ultraviolet rays, which is more in line with the actual situation of rural decentralized water supply and has the advantages of flexible application, simple operation, small footprint, strong scalability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a system diagram of the over-flow rural decentralized water supply water purification and pipeline biofilm cultivation device;

[0028] Figure 2Schematic diagram of a biofilm sampling device equipped with slides of different materials;

[0029] Figure 3 Schematic diagram of a circular biofilm slide and a vertically inserted square slide;

[0030] Figure 4 A cross-sectional view of a biofilm sampling device equipped with slides of different materials;

[0031] Figure 5 Plan view of the biofilm sampling device for assembling slides of different materials;

[0032] Figure 6 This is a schematic diagram of the installation of an over-flow ultraviolet disinfection lamp;

[0033] Figure 7 The changes of total bacterial count in rural decentralized water supply under single NaClO disinfection;

[0034] Figure 8 The morphology of biofilm on polypropylene (PP) and stainless steel (SS) pipes under single NaClO disinfection;

[0035] Fig. 9 The changes of total bacterial count in rural decentralized water supply under single ClO2 disinfection;

[0036] Fig.10 The morphology of biofilm on PP and SS pipes under single ClO2 disinfection;

[0037] Fig.11 The change of total bacterial count in rural decentralized water supply without disinfection treatment;

[0038] Fig.12 The morphology of biofilm on PP and SS pipes without disinfection treatment;

[0039] Fig.13 The change of total bacterial count in rural decentralized water supply under single ultraviolet (UV) disinfection in front of water supply pipelines;

[0040] Fig.14 The morphology of biofilm on PP and SS pipes under single UV disinfection in front of water supply pipelines;

[0041] Fig.15 The changes in the total colony count in rural decentralized water supply under double UV disinfection at the front / faucet end of the water supply pipeline.

[0042] Legend:

[0043] 1. Submersible pump; 2. Sand filter tank; 3. Overrun pipe; 4. Water storage tank; 5. Electrical control box; 6. Concentrated disinfectant tank; 7. Mixing disinfectant water tank; 8. Overflow water supply pipeline; 9. Overflow ultraviolet disinfection lamp; 10. Multiple slide biofilm sampling devices; 11. Sampling ports along the pipeline; 12. Flow control pump; 13. Flow meter; 14. Valve; 15. Biofilm circular slide; 16. Piston assembly; 17. Water supply pipeline connecting component; 18. Square slides of different materials; 19. Screw cap; 20. Overflow ultraviolet disinfection lamp; 21. Overflow ultraviolet disinfection glass protective cover; 22. Overflow ultraviolet disinfection metal shell. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0045] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0046] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0047] The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. The directions or positional relationships indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0050] The present invention provides an over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device and method.

[0051] Example 1

[0052] like Figure 1 - Figure 8 As shown, the present invention provides a technical solution: a flow-through rural decentralized water supply water quality purification and pipeline biofilm cultivation device and method, comprising: a submersible pump 1, an electrical control box 5 is arranged on the submersible pump 1, a sand filter tank 2 is arranged on one side of the submersible pump 1, a water storage tank 4 is arranged on the side of the sand filter tank 2 away from the submersible pump 1, an overrunning pipe 3 is connected between each of the submersible pump 1, a stirring and disinfecting water tank 7 is arranged on the side of the water storage tank 4 away from the sand filter tank 2, and the stirring and disinfecting water tank 7 is arranged on the side of the water storage tank 4 away from the sand filter tank 2. A valve 14 is provided on the side away from the water storage tank 4, a flow control pump 12 is provided between each of the water storage tank 4, the stirring and disinfecting water tank 7 and the valve 14, a concentrated disinfectant tank 6 is provided on the stirring and disinfecting water tank 7, a flow meter 13 is provided on the side of the valve 14 away from the flow control pump 12, and an overflow water supply pipe 8 is provided on the side of the flow meter 13 away from the valve 14, and an overflow ultraviolet disinfection lamp 9, a multi-slide biofilm sampling device 10 and a sampling port 11 along the pipeline are respectively provided on the overflow water supply pipe 8.

[0053] In this embodiment, the submersible pump 1 is started to extract the source water into the sand filter tank 2 for filtration and turbidity removal, and then enters the water storage tank 4, or when the turbidity of the source water is lower than 0.2NTU, the source water directly enters the water storage tank 4 through the bypass pipe 3; when the water volume in the water storage tank 4 is less than 1 / 3 of the volume, the electrical control box 5 automatically controls the submersible pump 1 to start the water filling. The water is discharged from the bottom of the water storage tank 4 at 0.5m, and is pumped by the flow control pump 12 and sent to the stirring disinfection water tank 7 equipped with the concentrated disinfection liquid tank 6, and the disinfection contact time is adjusted. A sufficient amount of concentrated sodium hypochlorite (NaClO) disinfectant is added to the concentrated disinfection liquid tank 6 in advance, and the stirring disinfection water tank 7 has a built-in mixer to ensure sufficient disinfection contact for 30 minutes; wherein, the flow rate of the concentrated liquid is adjusted by the flow control pump 12 to achieve a preset residual chlorine of 0.3-0.5mg / L in the water discharged from the stirring disinfection water tank 7. Do not start the overflow ultraviolet disinfection lamp 9 in front of the water supply pipe and the faucet end. Use a single NaClO disinfection method, and stir the water output of the disinfection water tank 7 to directly transport it to the overflow water supply pipe 8. The flow rate of the water supply pipe is adjusted by the flow control pump 12, the flow meter 13, and the valve 14 to reach the preset flow rate of 0.1m / s. Before the device is started, the overflow water supply pipe 8 is made of polyethylene (PE) material pipes with threaded connections in an S shape. The biofilm slides made of polypropylene (PP), stainless steel (SS) and copper (Cu) are assembled to the biofilm sampling device in advance and fixedly installed on the side of the water supply pipe. Then run the device continuously, take tap water samples and water samples along the way regularly, and analyze the changes in the water quality of rural decentralized water supply under the action of NaClO disinfection, such as Figure 7 The figure shows the change of total bacterial count in rural decentralized water supply under single NaClO disinfection with no disinfection as control. At the same time, the piston assembly 16 of the biofilm sampling device along the pipeline is removed regularly to obtain circular slides of biofilms grown in situ on different pipes under single NaClO disinfection and square slides of different materials, and further analyze the growth characteristics of the biofilms, such as Figure 8 Shown are the morphologies of biofilms on PP and SS pipes under single NaClO disinfection.

[0054] Example 2

[0055] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig. 9 and Fig.10 As shown, the multi-slide biofilm sampling device 10 includes a water supply pipe connecting component 17, a biofilm circular slide 15 is arranged on one side of the water supply pipe connecting component 17, a square slide 18 of different materials is arranged in the circular biofilm slide 15, a piston assembly 16 is arranged on the side of the circular biofilm slide 15 away from the water supply pipe connecting component 17, and a screw cap 19 is arranged at one end of the piston assembly 16.

[0056] In this embodiment, the ClO2 concentrate is added to the concentrated disinfectant tank 6, and the flow rate of the ClO2 concentrate is adjusted by the flow control pump 12 to achieve a preset ClO2 residual of 0.1-0.3 mg / L in the water outlet of the disinfectant tank. The rest is the same as the specific implementation example 1, the device is continuously operated, and tap water samples and water samples along the way are taken regularly to analyze the changes in the water quality of rural decentralized water supply under the action of ClO2 disinfection. Fig. 9 The figure shows the change of total bacterial count in rural decentralized water supply under single ClO2 disinfection with no disinfection as control. Fig.10 Shown is the morphology of biofilm on PP and SS pipes under single ClO2 disinfection.

[0057] Example 3

[0058] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig.11 and Fig.12 As shown, the circular biofilm carrier 15 is made of different materials such as polyethylene or polyvinyl chloride, and its diameter is the same as the diameter of the hole on the side of the pipe wall, and can also be vertically inserted into the square carrier 18 of different materials; the piston assembly 16 can be directly embedded in the circular biofilm carrier 15 and fixed with a screw nut 19 of the same size; the water supply pipe connecting component 17 connects and fixes the first part and the second part to the side of the water supply pipe by threading; multiple carrier biofilm sampling devices 10 are arranged along the water supply pipe every 5 to 10 meters. By changing the material of the biofilm carrier, when it is necessary to collect the biofilm, the piston assembly 16 of the biofilm sampling device is directly disassembled to take out the in-situ biofilm circular carrier 15 and the square carriers 18 of different materials.

[0059] In this embodiment, no disinfectant is added to the concentrated disinfectant tank 6, and the ultraviolet lamps in front of the water supply pipe and at the faucet end are kept turned off. The source water enters the sand filter tank 2, the water storage tank 4, and the stirring disinfection water tank 7 without disinfectant through the submersible pump 1, and then directly enters the water supply pipe and is transported to the faucet. The device is continuously operated, and tap water samples, water samples along the process, and biofilms along the pipeline are regularly taken. The rest is the same as the specific implementation example 1. The results are as follows Fig.11 The figure shows the change of total colony count in rural decentralized water supply without disinfection treatment. Fig.12 Shown are the morphologies of biofilms on PP and SS pipes without disinfection treatment.

[0060] Example 4

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig.13 and Fig.14 As shown, one end of the overflow water supply pipe 8 is provided with an overflow ultraviolet disinfection metal shell 22, a overflow ultraviolet disinfection metal shell 22 is provided with an overflow ultraviolet disinfection glass protection cover 21, and a overflow ultraviolet disinfection lamp 20 is provided in the overflow ultraviolet disinfection glass protection cover 21.

[0062] In this embodiment, no disinfectant is added to the concentrated disinfectant tank 6, the ultraviolet disinfection lamp at the faucet end is kept in the off state, the ultraviolet disinfection lamp in front of the water supply pipe is started and kept running continuously, the power of the ultraviolet disinfection lamp in front of the pipe is 28W, and the ultraviolet dose is 40mJ / cm2. The source water enters the sand filter tank 2, the water storage tank 4, and the stirring disinfection water tank 7 without disinfectant through the submersible pump 1, and then is disinfected by the ultraviolet lamp in front of the water supply pipe, and then enters the water supply pipe and is transported to the faucet. The rest is the same as the specific implementation example 1. The device is in continuous operation, and tap water samples, water samples along the process, and biofilms along the pipeline are taken regularly. The results are as follows Fig.13 The figure shows the change of total bacterial count in rural decentralized water supply under single UV disinfection in front of water supply pipes with no disinfection as control. Fig.14 Shown is the morphology of biofilm on PP and SS pipes under single UV disinfection in front of the water supply pipeline.

[0063] Example 5

[0064] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig.15 As shown, one ends of the two overflow water supply pipes 8 are respectively connected to the two ends of the same side of the overflow ultraviolet disinfection metal shell 22, the overflow ultraviolet disinfection lamp 20 is installed in the overflow ultraviolet disinfection glass protective cover 21, and one end of the overflow ultraviolet disinfection glass protective cover 21 is installed in the overflow ultraviolet disinfection metal shell 22.

[0065] In this embodiment, no disinfectant is added to the concentrated disinfectant tank 6, and the ultraviolet disinfection lamps in front of the water supply pipe and at the faucet end are started and kept running continuously. The power of the ultraviolet disinfection lamps is 28W, and the ultraviolet dose is 40mJ / cm2. The source water enters the sand filter tank 2, the water storage tank 4, and the stirring disinfection water tank 7 without disinfectant through the submersible pump 1. After being disinfected by the ultraviolet lamp in front of the water supply pipe, it enters the water supply pipe, and then is disinfected by ultraviolet light at the faucet end, and finally transported to the faucet. The rest is the same as the specific implementation example 1. The device is in continuous operation, and tap water samples, water samples along the process, and biofilms along the pipeline are taken regularly. The results are as follows Fig.15Shown is the change in the total colony count in rural decentralized water supply under double UV disinfection treatment at the front / faucet end of the water supply pipeline.

[0066] Example 6

[0067] like Figure 1 - Figure 8 As shown, pebbles are arranged at the bottom of the sand filter tank 2, the lower part of the sand layer is 1-2 mm sand and gravel, accounting for 2 / 3 of the total sand and gravel, and the upper part of the sand layer is 0.2-0.5 mm sand and gravel, accounting for 1 / 3 of the total sand and gravel; the sand filter tank 2 is equipped with an override pipe 3, and when the turbidity of the water source is less than 0.2NTU, the water is directly pumped into the water storage tank 4 through the override pipe 3.

[0068] In this embodiment, NaClO / ultraviolet combined disinfection treatment is adopted, NaClO is added to the concentrated disinfectant tank 6, and the ultraviolet disinfection lamp at the faucet end of the water supply pipeline is started and kept running continuously, so as to study the water purification efficiency of rural decentralized water supply and the growth characteristics of pipeline biofilm under the action of NaClO / ultraviolet combined disinfection, and the rest is the same as the specific implementation example 1.

[0069] Example 7

[0070] like Figure 1 - Figure 8 As shown, water enters the water tank 4 from the top and mud is discharged from the bottom, and a water outlet is set at a distance of 0.5 meters from the bottom; a liquid level gauge is arranged in the water tank 4, and when the volume of water in the water tank 4 is less than 1 / 3, the electrical control box 5 automatically starts to control the submersible pump 1 to pump water to fill it up; the stirring and disinfecting water tank 7 is equipped with a concentrated disinfectant tank 6, to which different disinfectants such as sodium hypochlorite and chlorine dioxide can be added to study the chemical disinfection effect, and the disinfectant is pumped in through a flow control pump 12, and the flow rate and concentration of the concentrated disinfectant can be adjusted by the flow control pump 12 and the valve 14 to ensure that the concentration of the disinfectant in the water outlet of the stirring and disinfecting water tank 7 meets the requirements, and flow control pumps 12 are arranged before and after the stirring and disinfecting water tank 7, so as to control the hydraulic retention time to meet the required disinfection contact time; the stirring and disinfecting water tank 7 has a built-in mixer, and mechanical stirring is used to ensure that the water body is in full contact with the disinfectant.

[0071] In this embodiment, a single NaClO disinfection treatment is adopted, but the source water does not pass through the sand filter tank 2 for turbidity removal and directly enters the water storage tank, the disinfection water tank and the water supply pipeline through the bypass pipe 3, and then the influence of turbidity on the total number of colonies and the growth of pipeline biofilm in rural decentralized water supply under the single NaClO disinfection is studied. The rest is the same as in specific embodiment 1.

[0072] Example 8

[0073] like Figure 1 - Figure 8As shown, the overflow water supply pipeline 8 is 30 to 120 meters long and has a pipe diameter of DN25, which is a common pipe length and diameter for rural water supply. It is overflow and non-circulating, which is more in line with the actual rural water supply situation. The pipeline is compactly arranged in an S shape. The pipeline is made of materials such as polyethylene, polyvinyl chloride, polypropylene or stainless steel, and the pipelines are connected by threads; a variety of slide biofilm sampling devices 10 and water intakes are arranged along the overflow water supply pipeline 8, and a faucet is set at the end of the pipeline; a flow control pump 12 and a flow meter 13 are arranged in front of the overflow water supply pipeline 8 to adjust and monitor the flow rate of the water body in the water supply pipeline, and an overflow ultraviolet disinfection lamp 9 is respectively arranged in front of the overflow water supply pipeline 8 and at the faucet end, with an ultraviolet dose of 10 to 40 mJ / cm2, which can be turned on and off separately or simultaneously. A single ultraviolet or double ultraviolet disinfection method can be designed according to experimental research, and it can also be used in conjunction with a disinfectant to form an ultraviolet / chemical disinfection combination process, which is used to carry out research on water quality purification and pipeline biofilm growth control in rural decentralized water supply under comparison of multiple disinfection methods.

[0074] In this embodiment, the ground-flow water supply pipe 8 can be disassembled and replaced with materials such as PVC or ductile iron, so as to study the effects of different pipe materials on the water purification efficiency of rural decentralized water supply and the growth characteristics of pipe biofilms. The rest is the same as in specific embodiment 1.

[0075] Working principle:

[0076] like Figure 1-15 As shown, the submersible pump 1 is started to draw water from the water source and transport it to the sand filter tank 2 for preliminary filtration to remove suspended matter and particles in the water and reduce the turbidity of the water. When the turbidity of the source water is lower than 0.2NTU, the water can directly enter the water storage tank 4 through the bypass pipe 3. The water storage tank 4 is equipped with a liquid level gauge. When the water volume is lower than 1 / 3 of the total capacity, the electrical control box 5 will automatically control the submersible pump 1 to replenish water to ensure that there is enough water for subsequent treatment.

[0077] The preliminarily treated water is pumped from the bottom of the water storage tank 4 to the stirring disinfection water tank 7 through the flow control pump 12. In the stirring disinfection water tank 7, the disinfectant (sodium hypochlorite or chlorine dioxide) stored in the concentrated disinfectant tank 6 is added to the water. The mixer ensures that the water and the disinfectant are evenly mixed and provides sufficient contact time to ensure the disinfection effect. The flow control pump 12 and the flow meter 13 are used to adjust and monitor the water flow rate in the water supply pipe to ensure that the preset flow rate and disinfectant concentration are reached to achieve effective water purification.

[0078] The water after the stirring disinfection water tank 7 is transported to the overflow water supply pipe 8. In the overflow water supply pipe 8, the overflow ultraviolet disinfection lamp 9 and the various slide biofilm sampling devices 10 are used for further processing and monitoring. The overflow ultraviolet disinfection lamp 9 is turned on at the appropriate time to provide physical disinfection, while the biofilm slide sampling device 10 helps analyze the growth of biofilm in the pipeline under different disinfection conditions. During the operation of the system, the tap and water samples along the way are regularly sampled and analyzed to monitor changes in water quality and changes in the total number of bacterial colonies. At the same time, the piston assembly 16 of the biofilm sampling device 10 can be removed to collect biofilm slides and analyze the growth characteristics and morphology of the biofilm. These measures ensure the safety and hygiene of water quality and provide a research basis for the natural growth and control of biofilms in pipelines.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A flow-through rural decentralized water supply water purification and pipeline biofilm cultivation device, characterized in that: include: A submersible pump (1), wherein an electrical control box (5) is arranged on the submersible pump (1), a sand filter tank (2) is arranged on one side of the submersible pump (1), a water storage tank (4) is arranged on the side of the sand filter tank (2) away from the submersible pump (1), an overrunning pipe (3) is connected between each of the submersible pump (1), the sand filter tank (2) and the water storage tank (4), a stirring and disinfecting water tank (7) is arranged on the side of the water storage tank (4) away from the sand filter tank (2), a valve (14) is arranged on the side of the stirring and disinfecting water tank (7) away from the water storage tank (4), and the water storage tank (4), a flow control pump (12) is arranged between each two of the stirring disinfection water tank (7) and the valve (14), a concentrated disinfectant tank (6) is arranged on the stirring disinfection water tank (7), a flow meter (13) is arranged on the side of the valve (14) away from the flow control pump (12), an over-flow water supply pipeline (8) is arranged on the side of the flow meter (13) away from the valve (14), and an over-flow ultraviolet disinfection lamp (9), a multi-slide biofilm sampling device (10) and a sampling port (11) along the pipeline are respectively arranged on the over-flow water supply pipeline (8).

2. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 1 is characterized by: The multi-slide biofilm sampling device (10) comprises a water supply pipe connecting component (17), a circular biofilm slide (15) is arranged on one side of the water supply pipe connecting component (17), square slides (18) made of different materials are arranged in the circular biofilm slide (15), a piston assembly (16) is arranged on the side of the circular biofilm slide (15) away from the water supply pipe connecting component (17), and a screw cap (19) is arranged at one end of the piston assembly (16).

3. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 2 is characterized by: The circular biofilm carrier (15) is made of different materials such as polyethylene or polyvinyl chloride, and has a diameter that is the same as the diameter of the opening on the side of the pipe wall, and can also be vertically inserted into a square carrier (18) made of different materials; the piston assembly (16) can be directly embedded in the circular biofilm carrier (15) and fixed with a screw nut (19) of the same size; the water supply pipe connecting component (17) is connected and fixed to the side of the water supply pipe by threading the first part and the second part; the multi-carrier biofilm sampling device (10) is arranged along the water supply pipe every 5 to 10 meters. By changing the material of the biofilm carrier, when it is necessary to collect biofilm, the piston assembly (16) of the biofilm sampling device is directly disassembled to take out the in-situ circular biofilm carrier (15) and the square carriers (18) of different materials.

4. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 3 is characterized by: An over-flow ultraviolet disinfection metal shell (22) is provided at one end of the over-flow water supply pipe (8), an over-flow ultraviolet disinfection metal shell (22) is provided in the over-flow ultraviolet disinfection glass protective cover (21), and an over-flow ultraviolet disinfection lamp (20) is provided in the over-flow ultraviolet disinfection glass protective cover (21).

5. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 4 is characterized by: One ends of the two flow-type water supply pipes (8) are respectively connected to the two ends of the same side of the over-flow type ultraviolet disinfection metal shell (22); the over-flow type ultraviolet disinfection lamp (20) is installed in the over-flow type ultraviolet disinfection glass protective cover (21); and one end of the over-flow type ultraviolet disinfection glass protective cover (21) is installed in the over-flow type ultraviolet disinfection metal shell (22).

6. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 1, characterized in that: The bottom of the sand filter tank (2) is provided with pebbles, the lower part of the sand layer is 1-2 mm sand and gravel, accounting for 2 / 3 of the total sand and gravel, and the upper part of the sand layer is 0.2-0.5 mm sand and gravel, accounting for 1 / 3 of the total sand and gravel; the sand filter tank (2) is equipped with an overflow pipe (3), and when the turbidity of the water source is less than 0.2 NTU, the water is directly pumped into the water storage tank (4) through the overflow pipe (3).

7. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 1 is characterized by: The water storage tank (4) is filled with water from the top and drains mud from the bottom. A water outlet is provided at a distance of 0.5 m from the bottom. A liquid level gauge is provided inside the water storage tank (4). When the volume of water in the water storage tank (4) is less than 1 / 3, the electrical control box (5) automatically starts to control the submersible pump (1) to pump water and fill the water storage tank (4). The disinfection water tank (7) is equipped with a concentrated disinfection liquid tank (6), into which different disinfectants such as sodium hypochlorite and chlorine dioxide can be added to study the chemical disinfection effect. The disinfectant is pumped in through a flow control pump (12). The flow rate and concentration of the concentrated disinfectant can be adjusted through the flow control pump (12) and the valve (14) to ensure that the concentration of the disinfectant in the water discharged from the stirring disinfection water tank (7) meets the requirements. The flow control pumps (12) are provided before and after the stirring disinfection water tank (7), so as to control the water flow residence time to meet the required disinfection contact time. The stirring disinfection water tank (7) is internally provided with a stirrer to ensure that the water body is fully in contact with the disinfectant through mechanical stirring.

8. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 1 is characterized by: The overflow water supply pipeline (8) has a total length of 30 to 120 meters and a pipe diameter of DN25, which are common pipe lengths and diameters for rural water supply. The overflow water supply pipeline (8) is overflow and non-circulating, which is more in line with the actual rural water supply situation. The pipeline is compactly arranged in an S shape and is made of materials such as polyethylene, polyvinyl chloride, polypropylene or stainless steel. The pipelines are connected by threads. A variety of slide biofilm sampling devices (10) and water intakes are arranged along the overflow water supply pipeline (8), and a faucet is set at the end of the pipeline. A flow control pump (12) and a flow meter (13) are arranged in front of the overflow water supply pipeline (8) to adjust and monitor the flow rate of the water body in the water supply pipeline.

9. The over-flow type rural decentralized water supply water purification and pipeline biofilm cultivation device according to claim 1, characterized in that: The overflow type water supply pipeline (8) is provided with overflow type ultraviolet disinfection lamps (9) in front of the pipeline and at the faucet end, respectively, with an ultraviolet dose of 10 to 40 mJ / cm2, which can be turned on and off separately or simultaneously. A single ultraviolet or double ultraviolet disinfection method can be designed according to experimental research, and a disinfectant can also be used to form an ultraviolet / chemical disinfection combination process, which is used to carry out research on water quality purification and pipeline biofilm growth control in rural decentralized water supply under comparison of multiple disinfection methods.

10. A method for using the overflow-type rural decentralized water supply water purification and pipeline biofilm cultivation device according to any one of claims 1 to 9, characterized in that: The steps include: S1. Fix the biofilm sampling device equipped with slides of different materials to the side of the water supply pipe and check for water leakage; S2. Select water supply pipes of different materials, connect and fix them section by section through threaded ports, and check for water leakage; S3. Fix and install the flow-through ultraviolet lamps in front of the water supply pipe and at the faucet end and the water intake along the way; S4, setting the control mode of the liquid level gauge of the water storage tank (4) through the electrical control box (5) to realize automatic or manual control of the water level of the water storage tank (4); S5. According to the turbidity of the source water and the specific experimental requirements, choose whether to filter the water through sand filtration or to directly feed the water into the water storage tank (4) through the sand filter tank (2) and the bypass pipe (3); S6, the stirring disinfection water tank (7) and the concentrated disinfection liquid tank (6) are fixedly connected, whether to add disinfectant, the type and dosage of disinfectant are selected, and the disinfection contact time and the disinfectant concentration in the effluent water are adjusted by adjusting the flow rate of the water inlet pump of the stirring disinfection water tank (7) and the concentrated disinfection liquid tank (6); S7, adjusting the flow control pump (12) and the valve (14), and determining the flow rate of the water in the overflow water supply pipeline through the flow meter (13); S8. According to the specific use requirements, choose whether to add disinfectant, whether to start the ultraviolet lamp, and select the specific disinfection method, including single chemical disinfection, single ultraviolet disinfection, double ultraviolet disinfection, and ultraviolet / chemical disinfection combined process, and determine the type and dosage of disinfectants and other parameters, so as to realize the control research of water quality purification and biofilm growth characteristics under different disinfection methods; S9. Start the device, supply water continuously, and regularly take tap water samples and water samples along the way to analyze changes in water quality; S10. Regularly remove the biofilm sampling device to obtain in-situ cultured biofilms grown at different flow rates, different disinfection methods, different pipe materials or different pipeline positions, and then analyze the formation process and growth characteristics of the biofilm.

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