A sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring

Abstract

The present invention discloses a sewage hierarchical treatment and reuse system based on multi-stage regulation and intelligent monitoring, which is characterized by comprising a regulating tank, a lifting pump, a multi-stage anaerobic biofilter, a multi-stage drop weir, a soil infiltration bed, a biological deodorization facility, and an intelligent monitoring component, a control console component, and a multi-stage reuse component, etc. The present invention treats rural domestic sewage through a multi-stage anaerobic biofilter, a multi-stage drop weir, and a soil infiltration bed, purifies the odor generated by anaerobic fermentation through a biological deodorization facility, monitors the soft measurement value of fecal coliform group of the effluent of each process link in real time through an intelligent monitoring component, and cooperates with the control console component and the multi-stage reuse component to reuse the reclaimed water in different treatment stages to different irrigation objects, thereby realizing hierarchical treatment and hierarchical utilization of sewage.

Description

Technical Field

[0001] The present invention belongs to the field of sewage treatment, and specifically relates to a sewage classification treatment and reuse system based on multi-stage regulation and intelligent monitoring. Background Art

[0002] The recycled water from rural sewage treatment facilities must meet the "Farmland Irrigation Water Quality Standard GBT5084-2021" for reuse in farmland nearby. This standard proposes multiple limit values ​​for fecal coliform in recycled water reused for different crops. However, the sewage treatment facility emission standards implemented by various provinces at this stage do not include fecal coliform as a basic control item, causing this indicator to become a monitoring blind spot. Not only is the monitoring cost high, but online monitoring cannot be implemented. On the other hand, the high requirements of the emission standards result in the content of organic matter, nitrogen, phosphorus and other substances in the effluent that can be absorbed and utilized by crops being negligible. The sewage reuse only achieves water replenishment but fails to fully utilize resources, which also leads to the villagers' extremely low willingness to use recycled water from sewage treatment facilities.

[0003] The existing rural sewage reuse system follows the model of large-scale municipal sewage treatment plant water reuse, focusing on the fully treated tail-end effluent, ignoring the characteristics of rural areas where it can be reused in nearby farmland, resulting in a waste of resources. Summary of the invention

[0004] In view of the shortcomings of the existing technology, a sewage classification treatment and reuse system based on multi-stage regulation and intelligent monitoring is provided. Rural domestic sewage is treated by multi-stage anaerobic biological filters, multi-stage waterfall weirs and soil infiltration beds, and the odor generated by anaerobic fermentation is purified by flower bed type biological deodorization filters. The fecal coliform group data of the effluent from each process link is monitored in real time by intelligent monitoring components. The recycled water at different treatment stages is reused to different irrigation objects in conjunction with the console component and the multi-stage reuse component, so as to realize the graded treatment and graded utilization of sewage, replace treatment with reuse, and use the multi-stage treatment design to gradually reduce the water inlet load. There is no need for aeration and sludge return, and the organic matter, nitrogen and phosphorus in the sewage that can be utilized as resources are fully retained.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sewage classification treatment and reuse system based on multi-stage regulation and intelligent monitoring, characterized in that it includes a regulating tank, a lifting pump, a multi-stage anaerobic biofilter, a multi-stage drop weir, a soil infiltration bed, a biological deodorization facility, as well as an intelligent monitoring component, a control console component and a multi-stage reuse component; sewage flows into the regulating tank by gravity from the pipe network and is lifted to the first-stage anaerobic biofilter by the lifting pump, and flows through the remaining anaerobic biofilters and the multi-stage drop weir by gravity, and then enters the soil infiltration bed for treatment and discharge; the odor generated by anaerobic fermentation in the multi-stage anaerobic biofilter is collected through the gas collecting pipe on the top of the multi-stage anaerobic biofilter, and is transported to the regulating tank by a blower, and enters the biological deodorization facility connected to the air hole on the top of the regulating tank for treatment and discharge;

[0007] The intelligent monitoring component includes a first online monitoring device and a liquid level meter respectively arranged at the water outlet of the first-stage anaerobic biofilter and the water outlet of the final-stage anaerobic biofilter, a second online monitoring device arranged at the water outlet of the multi-stage waterfall weir, and a host computer arranged in the equipment room;

[0008] The second online monitoring device includes an online redox potential monitor, an online dissolved oxygen monitor, and an online turbidity monitor. The host computer integrates a fecal coliform group soft sensor, receives real-time monitoring data of redox potential, dissolved oxygen, and turbidity, and predicts fecal coliform group through a machine learning model;

[0009] The fecal coliform group soft sensor is based on the MATLAB software platform, adopts a generalized regression neural network model, uses historical monitoring data for offline learning, and makes online predictions based on real-time monitoring data.

[0010] Furthermore, the number of stages of the multi-stage anaerobic biofilter is adapted to the actual water inflow, and the average daily water inflow is less than 20m 3 A two-stage anaerobic biofilter is used with an average daily water inflow of 20m 3 ~40m 3 Adopt three-stage anaerobic biofilter, with daily average water inflow of >40m 3 A four-stage anaerobic biofilter can be used, with adjacent anaerobic biofilters connected end to end in series, and the water inlet elevation of each stage of the anaerobic biofilter decreasing step by step; the number of levels of the multi-stage drop weir is adapted to the terrain and the water outlet elevation of the last stage anaerobic biofilter, so that the drop height of each stage is ≥300mm.

[0011] Furthermore, a porous water distribution pipe and an outlet pipe are fixed on the upper part of the anaerobic biofilter, and the height difference between the porous water distribution pipe and the outlet pipe is ≥250mm. The interior of each anaerobic biofilter is divided into an inlet bin and an outlet bin by a baffle, and a grid is provided on the top and middle of the baffle.

[0012] Furthermore, each anaerobic biofilter is provided with a first packing layer and a second packing layer in order from top to bottom. The filter material of the first packing layer is composed of volcanic rocks with smaller diameters, and the filter material of the second packing layer is composed of volcanic rocks with larger diameters.

[0013] Furthermore, a backwash water pipe and a backwash sewage pipe are provided at the bottom of each anaerobic biofilter, and the backwash sewage pipe is connected to the regulating tank. When the liquid level monitored by the liquid level gauge in the anaerobic biofilter exceeds the top of the guide plate, the console component successively opens the backwash drainage valve and the backwash water inlet valve for automatic backwashing, and the single backwashing time is 5 to 10 minutes.

[0014] Furthermore, the soil infiltration bed includes a water distribution layer, a filler layer and a water collection layer from top to bottom. The water distribution layer is filled with pebbles and is provided with a porous water distribution pipe. The filler of the filler layer is a mixture of biochar and soil. The water collection layer is filled with coarse sand. The bottom layer is provided with a water outlet, and dryland reeds are planted above the soil infiltration bed.

[0015] Furthermore, the biological deodorization facility includes a single or multiple independent flowerbed-type biological deodorization filters, the diversion air duct at the bottom of the filter is connected to the air holes at the top of the regulating tank, the inside of the filter is divided into a coke and highly air-permeable soil mixed layer, a coarse sand layer and a zeolite layer from top to bottom, the conical water collection port at the bottom of the filter is provided with a grid, the water collection port is connected to the filter drainage pipe, and herbaceous landscape plants are planted on the upper part of the flowerbed, which has both deodorization and landscaping functions.

[0016] Furthermore, the fecal coliform group soft sensor is based on the MATLAB software platform, adopts a generalized regression neural network model, uses historical monitoring data for offline learning, and makes online predictions based on real-time monitoring data, and the steps are as follows:

[0017] S1. Define the GRNN input layer and output layer. The input parameters include ORP, DO and turbidity of the same water sample, and the output parameters are the corresponding fecal coliform group, which are expressed as:

[0018]

[0019] S2. Define the GRNN pattern layer parameters. The number of neurons in the pattern layer is equal to the number of learning samples n. The transfer function is expressed as:

[0020]

[0021] In the formula, the output of neuron i is the exponential square of the square of the Euclid distance between the input variable and its corresponding sample X The exponential form of X is the network input variable; X i is the learning sample corresponding to the i-th neuron;

[0022] S3. Use the defined GRNN to sum the input samples. The output sample dimension is k. The number of nodes in the summation layer is k+1. One of the nodes outputs S D is the arithmetic sum of the outputs of the pattern layer, and the outputs of the remaining nodes are S Nj is the weighted sum of the outputs of the pattern layer, w ij is the weighting coefficient, and the calculation formula is:

[0023]

[0024] S4, the output layer neuron divides the arithmetic and weighted sum of the sum layer to calculate the fecal coliform group predicted by the GRNN model, which is expressed by the following formula:

[0025]

[0026] The console component includes a database, configuration software, backwash control program and valve control program integrated in the host computer. It can control backwashing according to the liquid level meter data and switch to reuse mode according to the fecal coliform data uploaded in real time by the smart monitoring component.

[0027] Furthermore, the console configuration software communicates with the Access database software through ODBC data connection, communicates with the MATLAB software through OPC data exchange, and communicates with the Studio5000 automatic control software through industrial Ethernet. It can control the opening and closing of each reuse bypass according to the fecal coliform data uploaded in real time by the intelligent monitoring component, and can also control the opening and closing of the backwash inlet valve and the backwash drain valve according to the liquid level value fed back in real time by the liquid level meter, so as to automatically control the graded reuse and backwashing of sewage;

[0028] The multi-stage recycling component includes a first recycling bypass connected to the outlet pipe of the first anaerobic biofilter, a second recycling bypass connected to the outlet pipe of the second anaerobic biofilter, and a third recycling bypass connected to the outlet pipe of the multi-stage drop weir. Each recycling bypass is provided with a corresponding valve, and the valves are respectively controlled by the PLC program of the console component.

[0029] Furthermore, the multi-stage reuse component sets up primary, secondary, tertiary and quaternary irrigation for different farmland crops according to the farmland recycled water reuse standards, wherein the primary irrigation is used for irrigation of paddy fields and dryland crops, the secondary irrigation is used for irrigation of processing, cooking and peeled vegetables, the tertiary irrigation is used for irrigation of raw vegetables, melons and herbal fruits, and the fourth-level irrigation is used for irrigation of landscapes and green spaces.

[0030] Furthermore, the multi-stage reuse component switches the irrigation mode according to the fecal coliform group compliance of the effluent from each stage of the treatment unit. For the first reuse bypass, when the fecal coliform group count of the effluent from the first anaerobic biofilter is greater than 40000MPN / L, the first reuse bypass control valve is closed; when 20000MPN / L≤fecal coliform group count≤40000MPN / L, the first reuse bypass control valve is opened to start primary irrigation; when the fecal coliform group count is less than 20000MPN / L, the first reuse bypass control valve and the first reuse bypass secondary irrigation control valve are opened to start primary and secondary irrigation; for the second reuse bypass, when the fecal coliform group count of the effluent from the second anaerobic biofilter is greater than 20000MPN / L, the second reuse bypass control valve is closed; when 100 When the fecal coliform count is less than 10000MPN / L, the second reuse bypass control valve and the second reuse bypass third-level irrigation control valve are opened to start the second and third-level irrigation. For the third reuse bypass, when the fecal coliform count of the water discharged from the multi-stage waterfall is greater than 10000MPN / L, the third reuse bypass control valve is closed. When the fecal coliform count is less than 1000MPN / L, the third reuse bypass control valve is opened to start the third-level irrigation. When the fecal coliform count is less than 1000MPN / L, the third reuse bypass control valve and the third reuse bypass fourth-level irrigation control valve are opened to start the third and fourth-level irrigation.

[0031] Furthermore, the sewage classification treatment and reuse system is suitable for the treatment and reuse of rural domestic sewage with influent pollutant concentrations satisfying a pH range of 6 to 8, COD below 2000 mg / L, TN below 200 mg / L, and SS below 200 mg / L.

[0032] Compared with the prior art, the advantages of the present invention are at least embodied in:

[0033] 1. Reuse instead of treatment, move the reuse node from the end of the process to the front end, and gradually reduce the water load of each process link after the reuse node, which indirectly reduces the cost of sewage treatment and improves the impact resistance of the treatment system.

[0034] 2. The control console configuration software is used to comprehensively design and optimize the water supply and drainage control logic of the sewage multi-stage storage and reuse system, which can utilize as much recycled water as possible while meeting the reuse standards, while fully retaining nutrients such as organic matter, nitrogen and phosphorus in the sewage.

[0035] 3. A fecal coliform group soft sensor based on machine learning has been developed, which can quickly and accurately calculate the difficult-to-measure fecal coliform group indicators based on simple and easily available indicators such as real-time ORP, DO, and turbidity, overcoming the limitation of monitoring costs on the sewage classification and reuse system.

[0036] 4. The overall technical route requires only a lifting pump and a blower as the high-energy-consuming equipment. Sewage does not require aeration or sludge return, which simplifies the process flow and operation and maintenance requirements while reducing carbon emissions. The full process automation control of sewage treatment and reuse can ensure the long-term and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the sewage classification treatment system of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of the sewage classification utilization system of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the flower bed type deodorizing biological filter tank of the present invention;

[0040] Figure 4 This is a schematic diagram of the console configuration software architecture of the present invention;

[0041] Figure 5 A statistical diagram of water volume monitoring of a sewage treatment and reuse system according to an embodiment of the present invention;

[0042] Figure 6 This is a comparison chart of the fecal coliform group soft sensor predicted value and the national standard measured value according to the embodiment provided by the present invention.

[0043] In the figure: 1 regulating tank, 11 first return bypass control valve, 110 first return bypass, 111 first return bypass primary irrigation branch, 112 first return bypass secondary irrigation branch, 14 first return bypass secondary irrigation control valve, 12 second return bypass control valve, 120 second return bypass, 121 second return bypass secondary irrigation branch, 122 second return bypass tertiary irrigation branch, 15 second return bypass tertiary irrigation control valve, 13 third return bypass control valve, 130 third return bypass, 131 third return bypass tertiary irrigation branch, 132 third return bypass tertiary irrigation branch, 16 third return bypass tertiary irrigation control valve, 2 biological deodorization facilities, 21 herbaceous landscape plants, 22 diversion airway, 23 filter tank drain pipe, 24 a mixed layer of coke and highly air-permeable soil, 25 a coarse sand layer, 26 a zeolite layer, 27 a biological deodorization filter grid, 3 a blower, 4 a lifting pump, 5 a first anaerobic biofilter, 50 a porous water distribution pipe of an anaerobic biofilter, 51 a water outlet pipe of an anaerobic biofilter, 52 an online monitoring device for the first anaerobic biofilter, 53 a liquid level meter, 54 a baffle, 55 a backwash water pipe, 56 a backwash sewage pipe, 57 a second packing layer of an anaerobic biofilter, 58 a anaerobic biofilter grid, 59 a first packing layer of an anaerobic biofilter, 6 a second anaerobic biofilter, 7 a gas collecting pipeline, 8 a multi-stage waterfall weir, 81 a second online monitoring device, 9 a soil infiltration bed, 91 a water distribution layer, 92 a packing layer, 93 a water collecting layer, 94 dryland reeds, 95 a porous water distribution pipe of a soil infiltration bed, 96 a water outlet. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] This embodiment provides a sewage classification treatment and reuse system based on multi-stage regulation and intelligent monitoring, wherein the anaerobic biological filter is divided into two stages, namely a first anaerobic biological filter 5 and a second anaerobic biological filter 6.

[0046] like Figure 1 and Figure 2As shown, the present invention provides a sewage classification treatment and reuse system based on multi-stage regulation and intelligent monitoring, including a regulating tank 1, a lifting pump 4, a first anaerobic biofilter 5, a second anaerobic biofilter 6, a multi-stage drop weir 8, a soil infiltration bed 9, a biological deodorization facility 2, and an intelligent monitoring component, a control console component and a multi-stage reuse component; the intelligent monitoring component includes a first online monitoring device 52 and a liquid level meter 53 arranged at the outlet of the first anaerobic biofilter 5 and the outlet of the second anaerobic biofilter 6, a second online monitoring device 81 arranged at the outlet of the multi-stage drop weir 8 and a host computer arranged in the equipment room, the second online monitoring device 81 includes an online monitoring instrument for oxidation-reduction potential (ORP), an online monitoring instrument for dissolved oxygen (DO) and an online monitoring instrument for turbidity; the control console component includes a database, configuration software, a backwash control program and a valve control program integrated in the host computer, and can control backwashing according to the data of the liquid level meter 53; the multi-stage reuse component includes a first reuse bypass 1 connected to the outlet pipe of the first anaerobic biofilter 5 10, a second reuse bypass 120 connected to the outlet pipe of the second anaerobic biofilter 6 and a third reuse bypass 130 connected to the outlet pipe of the multi-stage drop weir 8, the first reuse bypass 110 is controlled by the first reuse bypass control valve 11, connected to the first reuse bypass primary irrigation branch 111 and the first reuse bypass secondary irrigation branch 112, the first reuse bypass secondary irrigation branch 112 is provided with a first reuse bypass secondary irrigation control valve 14, the second reuse bypass 120 is controlled by the second reuse bypass control valve 11 2, connected with the second reuse bypass secondary irrigation branch 121 and the second reuse bypass tertiary irrigation branch 122, the second reuse bypass tertiary irrigation branch 122 is provided with a second reuse bypass tertiary irrigation control valve 15, the third reuse bypass 130 is controlled by the third reuse bypass control valve 13, connected with the third reuse bypass tertiary irrigation branch 131 and the third reuse bypass quaternary irrigation branch 132, the second reuse bypass tertiary irrigation branch 122 is provided with a third reuse bypass quaternary irrigation control valve 16.

[0047] The sewage flows into the regulating tank 1 by gravity from the pipe network and is lifted by the lifting pump 4 to the first anaerobic biofilter 5, and flows by gravity in turn through the second anaerobic biofilter 6 and the multi-stage waterfall weir 8 into the soil infiltration bed 9 for treatment before discharge; the odor generated by anaerobic fermentation in the first anaerobic biofilter 5 and the second anaerobic biofilter 6 is collected through the gas collecting pipe 7 at the top of the anaerobic biofilter, transported to the regulating tank 1 by the blower 3, and enters the biological deodorization facility 2 connected to the air hole at the top of the regulating tank for treatment before discharge; the intelligent monitoring component, the control console component and the multi-stage reuse component jointly control the state of the reuse pipeline, monitor the fecal coliform group of each stage of treatment units in real time, and automatically switch the sewage reuse mode according to the principle of priority reuse.

[0048] like Figure 3As shown, the biological deodorization facility 2 includes a single or multiple independent flower bed type biological deodorization filters, the guide air duct 22 at the bottom of the flower bed type biological deodorization filter is connected to the air hole at the top of the regulating tank 1, the interior of the flower bed type biological deodorization filter is divided into a coke and highly air permeable soil mixed layer 24, a coarse sand layer 25 and a zeolite layer 26 from top to bottom, the cone water collection port at the bottom of the flower bed type biological deodorization filter is provided with a grid 27, the water collection port is connected to the filter drainage pipe 23, and herbaceous landscape plants 21 are planted on the upper part of the flower bed, which has the functions of deodorization and landscaping.

[0049] like Figure 4 As shown, the console configuration software communicates with the Access database software through ODBC data connection, communicates with the MATLAB software through OPC data exchange, and communicates with the Studio5000 automatic control software through industrial Ethernet. The specific implementation steps include:

[0050] S1. Configuration software communication settings

[0051] Create a new OPC server in the configuration software, set the network node name to \\localhost, select "KingView.View.1" for OPC server information, customize auxiliary variables such as "ORP", "DO", "Turbidity" in the "Data Dictionary", select the I / O type variable type, and associate the newly created OPC server;

[0052] S2, MATLAB communication settings

[0053] The configuration software data is collected through the MATLAB command language, including establishing a client, connecting to a server, adding a group, adding auxiliary variables, setting the save interval, setting the number of saves, calling soft sensor prediction, sending prediction results, etc. The relevant M file programs are as follows:

[0054] Da=opcda('localhost','KingView.View.1');

[0055] Connect(Da);

[0056] Group1=addgroup(Da,'groupread');

[0057] Itm1=additen(Group,'jsll','wnnn');

[0058] IN = [Itm1.value];

[0059] Set(Group1,'UpdateRate',1800);

[0060] Set(Group1,'RecordsToAcquire',20);

[0061] Set(Group1,'StartFcn',@opccallback);

[0062] Set(Group1,'SlopFcn',@opccallback);

[0063] Set(Group1,'RecordsAcquiredFcn',@opccallback);

[0064] Set(Group1,'DafaChangeFcn',@opccallback);

[0065] Start(Group1);

[0066] Pause(2);

[0067] Out = estimator (IN);

[0068] Writeasync(Out);

[0069] The fecal coliform group soft sensor adopts the GRNN prediction model, and the calculation process is expressed as follows:

[0070] C coliform =f estimator (ORP T ;DO T ;Turbidity T )

[0071] S3, Database Communication Settings

[0072] Create a new Access database, define an ODBC data source named "WS", create a record named "BIND1" in the SQL access browser of the configuration software, define auxiliary variables, add a button, and label the button as "Database Communication Connection". When the button "pops up", call the SQLConnect() and SQLSelect() functions to establish a database connection. The relevant instructions include:

[0073] SQLConnect(DeviceID,"dsn=WS;uid=;pwd=");

[0074] SQLSelect(DeviceID,"kingview","BIND1",",");

[0075] To create a table, create a new table template table in the access manager, set the variable type, and create a "Create Table" button on the interface. When the button pops up, call the SQLCreateTable() function. The expression is:

[0076] SQLCreateTable(DeviceID,"bltable","table");

[0077] Call the SQLInsert() function and use the variable defined in the record body BAND1 to insert it into the field of the last record in the Access database. The related function is expressed as:

[0078] SQLInsert(DeviceID,"bltable","BIND1");

[0079] Adjust the frequency of data insertion to save data in real time into the database.

[0080] Based on the above-mentioned console configuration software architecture, the intelligent monitoring component, console component and multi-stage reuse component jointly control the opening and closing of each reuse pipeline valve according to the set boundary conditions to realize intelligent multi-stage sewage reuse. For the first reuse bypass 110, when the fecal coliform count of the effluent from the first anaerobic biofilter 5 is greater than 40000 MPN / L, the first reuse bypass control valve 11 is closed; when it is 20000 MPN / L≤fecal coliform count≤40000 MPN / L, the first reuse bypass control valve 11 is opened to start primary irrigation; when the fecal coliform count is less than 20000 MPN / L, the first reuse bypass control valve 11 and the first reuse bypass secondary irrigation control valve 14 are opened to start primary and secondary irrigation; for the second reuse bypass 120, when the fecal coliform count of the effluent from the second anaerobic biofilter 6 is greater than 20000 MPN / L, the second reuse bypass control valve 12 is closed; when it is 10000 MPN / L≤fecal coliform count≤20000 MPN / L, the second reuse bypass control valve 12 is opened to start the secondary irrigation. When the fecal coliform count is less than 10000MPN / L, the second reuse bypass control valve 12 and the second reuse bypass third-level irrigation control valve 15 are opened to start the secondary and third-level irrigation. For the third reuse bypass 130, when the fecal coliform count of the water discharged from the multi-stage waterfall weir 8 is greater than 10000MPN / L, the third reuse bypass control valve 13 is closed. When 1000MPN / L≤fecal coliform count≤10000MPN / L, the third reuse bypass control valve 13 is opened to start the third-level irrigation. When the fecal coliform count is less than 1000MPN / L, the third reuse bypass control valve 13 and the third reuse bypass fourth-level irrigation control valve 16 are opened to start the third and fourth-level irrigation.

[0081] After testing by the applicant, the present embodiment was used to build a pilot project of a sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring in a rural area. The average daily sewage volume in the rural area is 20-50m 3 The sewage treatment facilities are surrounded by farmland, and the demand for irrigation water is large.

[0082] After the wastewater treatment and reuse system was put into stable operation, the daily recycled water consumption at all levels and the water discharge at the end of the system were counted for two consecutive weeks. The statistical results are as follows: Figure 5 As shown in the figure, the sum of the recycled water at each level accounts for more than 50% of the incoming water, reaching 10-25m 3 / d, paddy fields, dryland crops, and processed, cooked, and peeled vegetables are the main objects of recycled water reuse. The system uses reuse instead of treatment, significantly reducing the water load of the back-end process links, and better retaining the organic matter, nitrogen, phosphorus and other nutrients in the sewage that can be recycled.

[0083] The comparison results of the fecal coliform group soft sensor prediction value of this embodiment and the actual measured value of the national standard method are as follows: Figure 6 As shown, the soft sensor prediction results of the three monitoring points including the effluent of the first-stage anaerobic biofilter, the effluent of the second-stage anaerobic biofilter and the effluent of the multi-stage waterfall weir are well consistent with the corresponding national standard verification results, and the relative error of the predicted value is basically maintained within 20%, proving that the fecal coliform group soft sensor of this embodiment can provide reliable real-time data support for the console component and the multi-stage reuse component.

[0084] In the present invention, the number of stages of the multi-stage anaerobic biofilter is adapted to the actual water inflow, and the average daily water inflow is less than 20m 3 A two-stage anaerobic biofilter is used with an average daily water inflow of 20m 3 ~40m 3 Adopt three-stage anaerobic biofilter, with daily average water inflow of >40m 3 A four-stage anaerobic biofilter can be used, and adjacent anaerobic biofilters are connected end to end in series, and the water inlet elevation of each stage of the anaerobic biofilter decreases step by step; the number of levels of the multi-stage drop weir is adapted to the terrain and the water outlet elevation of the last stage anaerobic biofilter, so that the drop height of each stage is ≥300mm. In other embodiments, a three-stage anaerobic biofilter, a four-stage anaerobic biofilter, etc. can be set according to actual conditions, and the working principle and beneficial effects are similar to those of this embodiment, and are not repeated here.

[0085] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring, characterized by: It includes a regulating tank, a lifting pump, a multi-stage anaerobic biofilter, a multi-stage waterfall weir, a soil infiltration bed, a biological deodorization facility, as well as an intelligent monitoring component, a control console component, and a multi-stage reuse component. The sewage flows into the regulating tank by gravity from the pipe network and is lifted to the first-stage anaerobic biofilter by the lifting pump. It flows by gravity through the remaining anaerobic biofilters and the multi-stage waterfall weir, and then enters the soil infiltration bed for treatment before discharge. The odor generated by anaerobic fermentation in the multi-stage anaerobic biofilter is collected through the gas collecting pipe on the top of the multi-stage anaerobic biofilter, transported to the regulating tank by the blower, and then discharged after being treated in the biological deodorization facility connected to the air hole on the top of the regulating tank; The intelligent monitoring component includes a first online monitoring device and a liquid level meter respectively arranged at the water outlet of the first-stage anaerobic biofilter and the water outlet of the final-stage anaerobic biofilter, a second online monitoring device arranged at the water outlet of the multi-stage waterfall weir, and a host computer arranged in the equipment room; The second online monitoring device includes an online redox potential monitor, an online dissolved oxygen monitor, and an online turbidity monitor. The host computer integrates a fecal coliform group soft sensor, receives real-time monitoring data of redox potential, dissolved oxygen, and turbidity, and predicts fecal coliform group through a machine learning model; The fecal coliform group soft sensor is based on the MATLAB software platform, adopts a generalized regression neural network model, uses historical monitoring data for offline learning, and makes online predictions based on real-time monitoring data. The steps are as follows: S1. Define the GRNN input layer and output layer. The input parameters include ORP, DO and turbidity of the same water sample, and the output parameters are the corresponding fecal coliform group, which are expressed as: S2. Define the GRNN pattern layer parameters. The number of neurons in the pattern layer is equal to the number of learning samples n. The transfer function is expressed as: In the formula, the output of neuron i is the exponential square of the square of the Euclid distance between the input variable and its corresponding sample X The exponential form of X is the network input variable; X i is the learning sample corresponding to the i-th neuron; S3. Use the defined GRNN to sum the input samples. The output sample dimension is k. The number of nodes in the summation layer is k+1. One of the nodes outputs S D is the arithmetic sum of the outputs of the pattern layer, and the outputs of the remaining nodes are S Nj is the weighted sum of the outputs of the pattern layer, w ij is the weighting coefficient, and the calculation formula is: S4, the output layer neuron divides the arithmetic and weighted sum of the sum layer to calculate the fecal coliform group predicted by the GRNN model, which is expressed by the following formula: The console component includes a database, configuration software, backwash control program and valve control program integrated in the host computer. Backwash is controlled according to the liquid level meter data, and the reuse mode is switched according to the fecal coliform group data uploaded in real time by the smart monitoring component.

2. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: The number of stages of the multi-stage anaerobic biofilter is adapted to the actual water inflow, and the average daily water inflow is less than 20m 3 A two-stage anaerobic biofilter is used with an average daily water inflow of 20m 3 ~40m 3 Adopt three-stage anaerobic biofilter, with daily average water inflow of >40m 3 A four-stage anaerobic biofilter is used, and adjacent anaerobic biofilters are connected end to end in series, and the water inlet elevation of each stage of the anaerobic biofilter decreases step by step; the number of levels of the multi-stage drop weir is adapted to the terrain and the water outlet elevation of the last stage anaerobic biofilter, so that the drop height of each stage is ≥300mm.

3. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: A porous water distribution pipe and an outlet pipe are fixed on the top of each anaerobic biofilter, and the height difference between the porous water distribution pipe and the outlet pipe is ≥250mm. The inside of the anaerobic biofilter is divided into an inlet bin and an outlet bin by a baffle, and a grid is provided on the top and the middle of the baffle.

4. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: The anaerobic biofilter is provided with a first packing layer and a second packing layer in sequence from top to bottom. The filter material of the first packing layer is composed of volcanic rocks with a smaller diameter, and the filter material of the second packing layer is composed of volcanic rocks with a larger diameter.

5. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: A backwash water pipe and a backwash sewage pipe are arranged at the bottom of the anaerobic biofilter, and the backwash sewage pipe is connected to the regulating tank. When the liquid level monitored by the liquid level gauge in the anaerobic biofilter exceeds the top of the guide plate, the console component successively opens the backwash drainage valve and the backwash water inlet valve for automatic backwashing, and the single backwashing time is 5 to 10 minutes.

6. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: The soil infiltration bed comprises a water distribution layer, a filler layer and a water collection layer from top to bottom. The water distribution layer is filled with pebbles and is provided with a porous water distribution pipe. The filler of the filler layer is a mixture of biochar and soil. The water collection layer is filled with coarse sand. The bottom layer is provided with a water outlet. Dryland reeds are planted above the soil infiltration bed.

7. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: The biological deodorization facility includes a single or multiple independent flowerbed-type biological deodorization filters. The diversion air duct at the bottom of the filter is connected to the air hole at the top of the regulating tank. The inside of the filter is divided from top to bottom into a coke and highly air-permeable soil mixed layer, a coarse sand layer and a zeolite layer. A grid is provided at the conical water collection port at the bottom of the filter. The water collection port is connected to the filter drainage pipe. Herbaceous landscape plants are planted on the upper part of the flowerbed, which has both deodorization and landscaping functions.

8. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: The console configuration software communicates with the Access database software through ODBC data connection, communicates with the MATLAB software through OPC data exchange, and communicates with the Studio5000 automatic control software through industrial Ethernet, and controls the opening and closing of each reuse bypass according to the fecal coliform group data uploaded in real time by the intelligent monitoring component, or controls the opening and closing of the backwash inlet valve and the backwash drain valve according to the liquid level value fed back in real time by the liquid level meter, and automatically controls the graded reuse and backwashing of sewage; The multi-stage recycling component includes a first recycling bypass connected to the outlet pipe of the first anaerobic biofilter, a second recycling bypass connected to the outlet pipe of the second anaerobic biofilter, and a third recycling bypass connected to the outlet pipe of the multi-stage drop weir. Each recycling bypass is provided with a corresponding valve, and the valves are respectively controlled by the PLC program of the console component.

9. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 8 is characterized by: The multi-stage reuse component is based on the farmland recycled water reuse standard and sets primary, secondary, tertiary and quaternary irrigation for different farmland crops. Among them, the primary irrigation is used for irrigation of paddy fields and dryland crops, the secondary irrigation is used for irrigation of processed, cooked and peeled vegetables, the tertiary irrigation is used for irrigation of raw vegetables, melons and herbal fruits, and the fourth level irrigation is used for irrigation of landscapes and green spaces.

10. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 9 is characterized by: The multi-stage reuse component switches the irrigation mode according to the fecal coliform group compliance of the effluent of each stage of the treatment unit. For the first reuse bypass, when the fecal coliform group count of the effluent of the first anaerobic biofilter is greater than 40000MPN / L, the first reuse bypass control valve is closed; when 20000MPN / L≤fecal coliform group count≤40000MPN / L, the first reuse bypass control valve is opened to start the first-stage irrigation; when the fecal coliform group count is less than 20000MPN / L, the first reuse bypass control valve and the first reuse bypass secondary irrigation control valve are opened to start the first and second-stage irrigation; for the second reuse bypass, when the fecal coliform group count of the effluent of the second anaerobic biofilter is greater than 20000MPN / L, the second reuse bypass control valve is closed; when 10000MPN / L When MPN / L≤fecal coliform count≤20000MPN / L, the second reuse bypass control valve is opened to start the second-level irrigation. When the fecal coliform count is <10000MPN / L, the second reuse bypass control valve and the second reuse bypass third-level irrigation control valve are opened to start the second and third-level irrigation. For the third reuse bypass, when the fecal coliform count of the water discharged from the multi-stage waterfall is >10000MPN / L, the third reuse bypass control valve is closed. When 1000MPN / L≤fecal coliform count≤10000MPN / L, the third reuse bypass control valve is opened to start the third-level irrigation. When the fecal coliform count is <1000MPN / L, the third reuse bypass control valve and the third reuse bypass fourth-level irrigation control valve are opened to start the third and fourth-level irrigation.

11. The sewage classification treatment and reuse system based on multi-level regulation and intelligent monitoring according to claim 1 is characterized by: The sewage classification treatment and reuse system is suitable for the treatment and reuse of rural domestic sewage with influent pollutant concentrations satisfying a pH range of 6-8, COD below 2000 mg / L, TN below 200 mg / L, and SS below 200 mg / L.

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