Integrated capital construction wastewater treatment system

Abstract

The invention discloses an integrated capital construction wastewater treatment system which comprises an intelligent monitoring unit used for controlling wastewater circulation in the system and collecting wastewater parameters at different positions, and a classified collection unit used for collecting slurry wastewater, cleaning wastewater and domestic wastewater generated in a capital construction area, the collecting mechanism A, the collecting mechanism B, the sewage pool A, the sewage tank and the collecting mechanism C are used for collecting chemical wastewater and earth surface mixed wastewater; the system comprises a pretreatment unit, a core treatment unit, a deep treatment unit and a recycling and discharging unit. According to the invention, different types of wastewater and sewage are collected in a classified manner, then pollutants in different types are subjected to targeted step-by-step treatment by virtue of the pretreatment unit, the core treatment unit and the deep treatment unit, and in particular, medicaments are creatively fed in real time in a feedforward dynamic compensation and dynamic pH value monitoring manner; and the problem of medicament waste caused by low medicament utilization rate or poor treatment effect caused by insufficient medicament addition is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy infrastructure construction, in particular to the technical field of on-site harmless treatment of construction wastewater generated by water conservancy infrastructure, and specifically to an integrated infrastructure wastewater treatment system. Background Art

[0002] Due to the complex sources of infrastructure project wastewater, which involves slurry for shaft protection, equipment cleaning, concrete curing, etc., and diverse pollutants, such as high-turbidity suspended solids, oil stains, heavy metals, and refractory organic substances, the treatment technology needs to take into account separate treatment according to quality and classification as well as efficient coordination. The existing technical system is mostly based on physical and chemical treatment and biochemical degradation methods. Existing systems generally adopt simple diversion and lack accurate identification of wastewater characteristics. For example, after the oil-containing wastewater and high-turbidity slurry wastewater are mixed, the oil film wraps the suspended solids, resulting in an increase of about 30%-50% in the dosage of subsequent flocculants. The pretreatment unit mainly consists of "grating + regulating tank", and there are no targeted measures for sudden pH changes, such as the pH of concrete curing wastewater can reach 11-12, emulsified oil, etc., and it can only remove 20%-30% of COD, increasing the treatment load.

[0003] Referring to Chinese Patent Document 1: CN102557335A discloses a wastewater treatment and reuse process during the infrastructure period of large-scale projects, which is particularly suitable for the treatment and reuse of domestic wastewater and production sewage generated during the infrastructure period of large-scale projects. Its steps include: pretreatment of wastewater; centralized biochemical treatment of wastewater; advanced treatment and reuse of wastewater. The process technical route involved in this invention is simple, operates stably, has a relatively low cost per ton of water treatment, and the treated effluent can be used for flushing toilets, greening, concrete mixing and curing, minimizing the water intake and sewage discharge during the infrastructure period. The problems solved are similar to those of the present invention application, but the types of wastewater treatment are relatively narrow. The main actual wastewater is only domestic sewage generated at the construction site, and there is no effective treatment plan for high-alkaline water, high heavy metals, and high chemical residue wastewater related to infrastructure.

[0004] In view of this, the present invention provides an integrated infrastructure wastewater treatment system dedicated to infrastructure wastewater treatment, aiming to achieve the purpose of recycling and harmless discharge through system treatment. Summary of the Invention

[0005] In order to solve the problem that due to the large variety and difficult treatment of wastewater and sewage at the existing infrastructure construction site, different degrees of environmental pollution will be caused after construction, the present application provides an integrated infrastructure wastewater treatment system for harmlessly treating various types of sewage and wastewater generated during infrastructure construction, so as to achieve the purpose of reusing the wastewater generated during construction and harmless discharge.

[0006] In order to achieve the above purpose, the technical solution adopted in the present application is as follows:

[0007] Integrated infrastructure wastewater treatment system, including an intelligent monitoring unit for controlling the flow of wastewater in the system and collecting wastewater parameters at different locations, and

[0008] Classification and collection unit, including collection mechanisms A, B, sewage tank A, sewage tank, and collection mechanism C for separately collecting slurry wastewater, cleaning wastewater, domestic wastewater, reagent wastewater, and surface mixed wastewater generated in the infrastructure construction area;

[0009] Pretreatment unit, including a grille filtration device for mixing wastewater from collection mechanisms A, B, and sewage tank A and filtering it, a flotation oil removal device for mixing sewage from the sewage tank and collection mechanism C and performing oil-water separation, and a neutralization reaction tank for temporarily storing the mixed sewage discharged after being treated by the grille filtration device and the flotation oil removal device;

[0010] Core treatment unit, including a high-efficiency flocculation sedimentation tank, a biochemical reaction tank, and an electrochemical oxidation tank connected in sequence, and the neutralization reaction tank is connected to the high-efficiency flocculation sedimentation tank;

[0011] Advanced treatment unit, including a ultrafiltration reverse osmosis membrane tank, an activated carbon adsorption tower, and an ultraviolet disinfection tank connected in sequence, and the electrochemical oxidation tank is connected to the ultrafiltration reverse osmosis membrane tank;

[0012] Reuse and discharge unit, including an intelligent diversion mechanism and a clean water reuse tank connected to the electrochemical oxidation tank.

[0013] Preferably, the collection mechanism A includes a backflow slurry flocculation device for collecting and temporarily storing the formation return slurry and a solid-liquid separation device for pressure-filtering the backflow slurry; the collection mechanism B includes a collection tank arranged around the equipment cleaning sewage outlet and sunken for collecting cleaning wastewater, the collection tank has a lowest position communicating with a diversion pipe, and the water outlet end of the diversion pipe is connected with a rotating screen for dynamic filtration; the rotating screen includes a screen arranged obliquely and rotatably, and spiral water baffle plates are arranged radially in the screen, and the diameter of the screen gradually decreases from top to bottom.

[0014] Preferably, the grille filtration device includes a box body for storing mixed sewage, a water inlet is arranged in the middle above the box body, water outlets are arranged on both sides of the box body, and at least one filter screen is vertically arranged near any water outlet in the box body.

[0015] Preferably, a pH sensor electrically connected to the intelligent monitoring unit is arranged in the neutralization reaction tank, the intelligent monitoring unit is also communicatively connected to a dosing mechanism for adding a pH value adjusting reagent into the neutralization reaction tank, and the intelligent monitoring unit determines according to the real-time pH value pH collected by the pH sensor actual and the preset pH value pH of the systemset The difference between them sends a chemical dosing signal to the chemical dosing mechanism. The actual chemical dosing amount u(t) of the chemical dosing mechanism is achieved through the following dynamic control algorithm.

[0016]

[0017] where e(t) = pH set - pH actual (t), which represents the real-time pH difference; K p , K i , K d represent the proportional, integral, and differential coefficients of PID control respectively; α represents the feed-forward compensation coefficient, which is calculated according to the wastewater flow rate Q and the pollutant concentration C waste ; Q represents the instantaneous wastewater flow rate, which is obtained by real-time acquisition through a flow meter; C waste represents the initial acid-base equivalent concentration of the wastewater, which is obtained through experimental calibration or on-line detection.

[0018] Preferably, the intelligent monitoring unit further includes a dynamic calibration module. The dynamic calibration module stores a program for dynamically adjusting the proportional, integral, and differential coefficients of PID control through the real-time pH difference and the change rate, specifically including the proportional coefficient K p

[0019] K p = K p0 ·(1 + β·|e(t)|

[0020] where K p0 represents the basic proportional coefficient, with a value range of 0.5 - 2.0; β represents the sensitivity factor. The larger the deviation, the faster the increase in K p , accelerating the corresponding response;

[0021] The integral coefficient K i

[0022]

[0023] where K i0 represents the basic integral coefficient, with a value range of 0.5 - 2.0;

[0024] The differential coefficient K d

[0025]

[0026] where K d0 represents the basic differential coefficient, with a value range of 0.1 - 0.5; γ represents the damping factor, which suppresses the violent fluctuations caused by mutations.

[0027] Still further preferably, the intelligent monitoring unit further includes a feedforward compensation optimization module for optimizing the feedforward compensation coefficient α. The feedforward compensation optimization module stores a determination program for the feedforward compensation coefficient α that can be executed. Specifically

[0028]

[0029] wherein, C target represents the target neutralization equivalent; C chemical represents the concentration of the active ingredient of the medicament; η represents the reaction efficiency of the medicament in the actual environment.

[0030] In order to improve the flocculation effect of the mixed sewage, reduce the dosage of the flocculant, and reduce the residue and waste of the flocculant, preferably, a flocculant dosing mechanism controlled by the intelligent monitoring unit is provided on the high-efficiency flocculation sedimentation tank. The flocculant dosed by the flocculant dosing mechanism is composed of 50%-60% of polyaluminum chloride, 20%-30% of polyferric sulfate, 5%-8% of anionic polyacrylamide, 3%-5% of zwitterionic polyacrylamide, 1%-2% of modified nano-silica, 0.5%-1% of graphene oxide, 0.5%-1% of sodium citrate, and 1%-2% of polydimethyldiallylammonium chloride by weight percentage.

[0031] In order to further improve the biochemical treatment effect, preferably, a plurality of Φ25×50mm composite porous conductive biological fillers are suspended in the biochemical reaction tank through a stainless steel mesh box. The biological fillers include a skeleton layer made of a three-dimensional grid of high-density polyethylene, a porous matrix layer composed of polyurethane foam and activated carbon powder wrapped outside the skeleton layer, a biological affinity layer made of polyvinyl alcohol gel outside the porous matrix layer, and a conductive functional layer provided outside the biological affinity layer for promoting electron transfer, accelerating denitrification and anaerobic ammonium oxidation. The conductive functional layer is formed by spraying a carbon nanotube and graphene dispersion liquid in a ratio of 1:1 and thermally reducing it at 80°C for 2 hours.

[0032] Beneficial effects:

[0033] 1. By classifying and collecting different types of wastewater and sewage, and then passing them through the pretreatment, core treatment and advanced treatment units, the pollutants in different types are treated step by step in a targeted manner. In particular, by means of feedforward dynamic compensation and dynamic pH value monitoring, the medicament is dosed in real time, so that the wastewater can always be maintained near the preset pH value in a short time, avoiding the problems of low medicament utilization rate resulting in medicament waste or insufficient medicament addition resulting in poor treatment effect.

[0034] 2. The rotary screen provided by the present invention adopts a conical design. Wastewater containing solids or flocs enters the screen through the end with a larger diameter. Under the action of the radial spiral water baffle, the wastewater cannot flow rapidly along the axial direction of the screen. Coupled with the slow rotation of the screen, the residence time of the wastewater in the screen is significantly increased, which is conducive to sufficient filtration. In addition, the rotation of the screen provides centrifugal force to the wastewater, which can accelerate the filtration of the wastewater and finally achieve a better solid-liquid separation effect.

[0035] 3. The present invention provides a new type of biological filler. Through nano-SiO 2 and GO, through physical adsorption and chemical bonding (such as Al-O-Si, Fe-O-C), a "skeleton structure" is formed inside the flocs, making the flocs denser and increasing the sedimentation rate by 30%-40%. AmPAM still maintains an efficient bridging effect under pH fluctuations or high-salt environments, further solving the problem that traditional APAM is prone to failure when pH < 6.

[0036] 4. The cationic property of poly(dimethyldiallylammonium chloride) (PDADMAC) protects the flocs from being easily broken during pumping or stirring, and the strength of the flocs generated is 50% higher than that of the existing flocculants. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 It is the system framework diagram of the present invention.

[0039] Figure 2 It is the schematic diagram of the system level flow of the present invention.

[0040] Figure 3 It is the schematic diagram of the grille filtering device. Detailed Embodiments

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0042] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0043] Embodiment 1:

[0044] This embodiment provides an integrated infrastructure wastewater treatment system. The system framework and working levels are schematically shown as Figure 1 - Figure 2 shown, including an intelligent monitoring unit for controlling the wastewater flow in the system and collecting wastewater parameters at different locations, and

[0045] a classified collection unit, including collection mechanisms A, B, sewage tank A, sewage tank, and collection mechanism C for separately collecting slurry wastewater, cleaning wastewater, domestic wastewater, reagent wastewater, and surface mixed wastewater generated in the infrastructure construction area; the role of the classified collection unit is to collect wastewater by quality according to the wastewater properties (suspended solids, oil, acidity and alkalinity, toxicity) to avoid cross-contamination. See Figure 2 shown, different wastewater is collected by targeted devices, and then enters the pretreatment unit for differential pretreatment in combination with the characteristics of the collected wastewater.

[0046] The pretreatment unit includes a grid filtration device for mixing and filtering wastewater from collection mechanisms A, B, and sewage tank A, a flotation oil removal device for mixing and separating oil and water from the sewage in the sewage tank and collection mechanism C, and a neutralization reaction tank for temporarily storing the mixed sewage discharged after being treated by the grid filtration device and the flotation oil removal device; the role of the pretreatment unit is to perform preliminary treatment according to the characteristics of different wastewater to reduce the load on the core unit; at the same time, the subsequent core treatment unit has stronger pertinence for different wastewater or harmful substances contained in the wastewater, avoiding the generation of new pollutants during the treatment process or new obstacles to sewage treatment.

[0047] The core treatment unit includes a high-efficiency flocculation sedimentation tank, a biochemical reaction tank, and an electrochemical oxidation tank connected in sequence, and the neutralization reaction tank is connected to the high-efficiency flocculation sedimentation tank; the purpose of the core treatment unit is to remove pollutants such as suspended solids, organic matter, and heavy metals. A revolutionary innovation has been made mainly in the high-efficiency flocculation sedimentation tank of the core treatment unit for flocculating wastewater. By adaptively adding self-developed flocculants, compared with existing flocculants, it is optimized for the high-viscosity characteristics of slurry wastewater, and the sedimentation speed is increased by 30%. Furthermore, porous fillers are filled in the A / O tank to enhance the attachment amount of microorganisms and improve the treatment efficiency.

[0048] The advanced treatment unit includes a ultrafiltration reverse osmosis membrane tank, an activated carbon adsorption tower, and an ultraviolet disinfection tank that are connected in sequence. The electro-chemical oxidation tank is connected to the ultrafiltration reverse osmosis membrane tank;

[0049] The reuse and discharge unit includes an intelligent shunt mechanism and a clean water reuse tank that are connected to the electro-chemical oxidation tank.

[0050] Example 2:

[0051] In this embodiment, based on Embodiment 1, the structure of the classified collection unit is further optimized. The collection mechanism A includes a return slurry flocculation device for collecting and temporarily storing the formation return slurry and a solid-liquid separation device for pressure filtering the return slurry; the collection mechanism B includes a collection tank that is arranged around the equipment cleaning sewage discharge port and is sunk for collecting cleaning wastewater. The collection tank has a lowest position connected to a diversion pipe, and the water outlet end of the diversion pipe is connected to a rotary screen for dynamic filtration; the rotary screen includes a screen that is inclined and rotatable, and spiral water baffle plates arranged radially are provided inside the screen, and the diameter of the screen gradually decreases from top to bottom.

[0052] In this embodiment, the grid filtration device includes a box body for storing mixed sewage. An inlet is arranged in the middle above the box body, and outlets are arranged on both sides of the box body. At least one filter screen is vertically arranged near any one of the outlets in the box body. It should be noted that although the structure of the grid filtration device provided in this embodiment is relatively simple, it is developed and designed by changing the concept of the prior art. Refer to Figure 3 As shown, when the mixed sewage enters the box body from the top inlet, the denser solid substances naturally sink to the bottom of the box body, and this part of the solid impurities will not generate resistance to the filter screen; the mixed sewage slowly flows out from both sides. Due to the cross-flow, the water flow inside the box body is very slow, so this further reduces the blocking pressure on the filter screen and extends the cleaning time period of the filter screen; compared with the existing filtration devices, the grid filtration device provided in this embodiment completes the natural sedimentation of solid substances before filtration, realizes self-adaptive density solid-liquid shunt, and then filters the impurities suspended and floating in the sewage.

[0053] Example 3:

[0054] In this embodiment, based on any of the above embodiments, the dynamic neutralization reaction is further controlled to improve the neutralization reaction efficiency of the wastewater and reduce the waste of chemicals. In this embodiment, a pH sensor electrically connected to the intelligent monitoring unit is arranged in the neutralization reaction tank. The intelligent monitoring unit is also communicatively connected to a chemical dosing mechanism for adding pH value adjusting chemicals to the neutralization reaction tank. The intelligent monitoring unit adjusts according to the real-time pH value pH collected by the PH sensor actual with the system preset pH value pHset The difference between them sends a chemical dosing signal to the chemical dosing mechanism. The actual chemical dosing amount u(t) of the chemical dosing mechanism is realized through the following dynamic control algorithm.

[0055]

[0056] where e(t) = pH set - pH actual (t), which represents the real-time pH difference; K p , K i , K d represent the proportional, integral, and differential coefficients of PID control respectively; α represents the feedforward compensation coefficient, which is calculated according to the wastewater flow rate Q and the pollutant concentration C waste ; Q represents the instantaneous wastewater flow rate, which is obtained by real-time acquisition through a flow meter; C waste represents the initial acid-base equivalent concentration of the wastewater, which is obtained through experimental calibration or on-line detection.

[0057] In this embodiment, the intelligent monitoring unit further includes a dynamic calibration module. The dynamic calibration module stores a program for dynamically adjusting the proportional, integral, and differential coefficients of PID control through the real-time pH difference and the change rate, specifically including the proportional coefficient K p

[0058] K p = K p0 ·(1 + β·|e(t)|

[0059] where K p0 represents the basic proportional coefficient, with a value range of 0.5 - 2.0; β represents the sensitivity factor. The larger the deviation, the faster the increase of K p , accelerating the corresponding response;

[0060] The integral coefficient K i

[0061]

[0062] where K i0 represents the basic integral coefficient, with a value range of 0.5 - 2.0;

[0063] The differential coefficient K d

[0064]

[0065] where K d0 represents the basic differential coefficient, with a value range of 0.1 - 0.5; γ represents the damping factor, which suppresses the violent fluctuations caused by mutations.

[0066] In this embodiment, the intelligent monitoring unit further includes a feedforward compensation optimization module for optimizing the feedforward compensation coefficient α. The feedforward compensation optimization module stores a determination program for the feedforward compensation coefficient α that can be executed. Specifically

[0067]

[0068] Among them, C target represents the target neutralization equivalent; C chemical is the concentration of the active ingredient of the medicament; η represents the reaction efficiency of the medicament in the actual environment.

[0069] With the optimized system described above, through the dynamic control of the medicament dosing, the control accuracy of the pH value can reach ±0.3, which is better than that of the traditional PID (±0.5 - 1.0). It avoids problems such as waste of medicament caused by over-dosing or decline in treatment effect or extension of the treatment time cycle caused by insufficient neutralization. Through feedforward compensation and dynamic PID, the waste of medicament is reduced by 20% - 40%. More importantly, as one of the important technical improvements of the present invention, the optimization module of the feedforward compensation coefficient α can improve the anti-interference ability of the system. For example, when the surface runoff suddenly increases due to heavy rain, resulting in a sudden change in flow, the response time is shortened by 50% and the system stability is improved; another example is that when the system receives a large amount of concrete curing or pulp equipment flushing wastewater, which causes a sudden increase in the pH value. The entire system is combined with the existing PLC or DCS system to achieve unattended operation and reduce manual operation errors. It should be noted that the control system involving the PLC or DCS system is a mature existing technology and is not the technical improvement point of the present invention, so it will not be elaborated here.

[0070] Example 4:

[0071] In order to improve the flocculation effect of the mixed sewage, reduce the dosage of the flocculant, and reduce the residue and waste of the flocculant, in this embodiment, based on any of the above embodiments, a flocculant dosing mechanism controlled by the intelligent monitoring unit is provided on the high-efficiency flocculation sedimentation tank. The flocculant dosed by the flocculant dosing mechanism is composed of 50% - 60% of polyaluminum chloride, 20% - 30% of polyferric sulfate, 5% - 8% of anionic polyacrylamide, 3% - 5% of zwitterionic polyacrylamide, 1% - 2% of modified nano-silica, 0.5% - 1% of graphene oxide, 0.5% - 1% of sodium citrate, and 1% - 2% of polydimethyldiallylammonium chloride by weight content percentage.

[0072] The preparation method of the above flocculant is briefly described as follows:

[0073] Premix the inorganic phase: Dry mix PAC and PFS in proportion to avoid hydrolysis precipitation caused by direct mixing of solutions.

[0074] Dispersion of nano materials: Disperse the modified nano SiO2 He and GO were ultrasonically dispersed in deionized water (30 min, 40 kHz), and sodium citrate was added for stabilization.

[0075] Organic phase dissolution: APAM and AmPAM were respectively prepared into 0.1% dilute solutions, and slow stirring was carried out to avoid breaking of molecular chains.

[0076] Composite blending: The inorganic phase, nano-dispersion, and organic phase were mixed in sequence, and finally PDADMAC was added, and stirring and aging were carried out for 2 h.

[0077] The technical effects of this example compared with the prior art are as follows:

[0078] Synergistic effect of nanomaterials: Nano-SiO 2 and GO form a "skeleton structure" inside the flocs through physical adsorption and chemical bonding (such as Al-O-Si, Fe-O-C), making the flocs denser and increasing the sedimentation rate by 30% - 40%. The lamellar structure of GO destroys the network viscosity structure of the mud, significantly reducing the apparent viscosity (the measured viscosity reduction rate ≥ 25%). Adaptability of zwitterionic polymers: AmPAM still maintains an efficient bridging effect under pH fluctuations or high-salt environments, while traditional APAM is prone to failure when pH < 6. Anti-shear stability: The cationic characteristics of PDADMAC protect the flocs from being easily broken during pumping or stirring. The technical indicators of the medicament provided in this example are compared with those of the existing flocculants as shown in Table 1 below:

[0079] Index Traditional PAC + APAM This composite formula Improvement range Settling velocity (m / h) 1.2 1.8 +50％ Turbidity of supernatant (NTU) 50～80 ≤15 Reduce by 70% Sludge moisture content (%) 85～90 78～82 Reduce by 8% - 10% Chemical cost (yuan / ton of water) 3.5 4.2 +20％*

[0080] Table 1 Comparison of indicators between the present invention and existing flocculants

[0081] The above formula provided in this example overcomes the problem of treating high-viscosity mud wastewater through inorganic-organic-nano three-level synergy, and has the advantages of rapid sedimentation, sludge reduction, and broad adaptability.

[0082] Example 5:

[0083] In order to further improve the biochemical treatment effect, on the basis of any of the above examples, multiple Φ25×50 mm composite porous conductive biological fillers are suspended in the biochemical reaction tank through a stainless steel mesh box. The biological fillers include a skeleton layer made of a three-dimensional grid of high-density polyethylene, a porous matrix layer composed of polyurethane foam and activated carbon powder wrapped outside the skeleton layer, a biological affinity layer composed of polyvinyl alcohol gel outside the porous matrix layer, and a conductive functional layer arranged outside the biological affinity layer for promoting electron transfer, accelerating denitrification and anaerobic ammonium oxidation. The conductive functional layer is formed by spraying a dispersion of carbon nanotubes and graphene in a ratio of 1:1 and thermally reducing at 80 °C for 2 hours.

[0084] The structure of the composite porous conductive biofiller provided in this embodiment is shown in Table 2 below

[0085]

[0086] Table 2 Structure and function table of composite porous conductive biological filler The performance parameters of the composite porous conductive biological filler provided in this embodiment are shown in Table 3 below

[0087]

[0088] Table 3 Performance parameters of composite porous conductive biological fillers

[0089] The composite porous conductive biological filler provided in this embodiment has the following technical advantages: the conductive coating + Anammox synergistically reduces the carbon source dosage by 30%, which can remove nitrogen more efficiently; the porous structure buffers water quality fluctuations (it still operates stably when COD≤500mg / L), and the DIET mechanism reduces the aeration demand, which makes the system more energy-efficient in terms of energy consumption. Finally, with the help of an integrated biofilm thickness sensor, the control system can be further linked to adjust the aeration volume, thereby achieving a significantly better effect than the existing technology.

[0090] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Integrated infrastructure wastewater treatment system, characterized by: It includes an intelligent monitoring unit for controlling the flow of wastewater in the system and collecting wastewater parameters at different locations, and The classification collection unit includes a collection mechanism A, a collection mechanism B, a sewage pool A, a sewage tank, and a collection mechanism C for respectively collecting mud wastewater, cleaning wastewater, domestic wastewater, pharmaceutical wastewater, and surface mixed wastewater generated in the infrastructure construction area; The pretreatment unit includes a grid filter device for mixing and filtering the wastewater from the collection mechanism A, the collection mechanism B and the sewage pool A, an air flotation oil removal device for mixing and separating the wastewater from the sewage tank and the collection mechanism C, and a neutralization reaction tank for temporarily storing the mixed wastewater discharged after being treated by the grid filter device and the air flotation oil removal device; The core processing unit comprises a high-efficiency flocculation sedimentation tank, a biochemical reaction tank, and an electrochemical oxidation tank which are connected in sequence, and the neutralization reaction tank is connected to the high-efficiency flocculation sedimentation tank; The deep treatment unit comprises an ultrafiltration reverse osmosis membrane pool, an activated carbon adsorption tower, and an ultraviolet disinfection pool which are connected in sequence, and the electrochemical oxidation pool is connected to the ultrafiltration reverse osmosis membrane pool; The reuse and discharge unit comprises an intelligent diversion mechanism and a clean water reuse tank which are connected to the electrochemical oxidation tank.

2. The integrated infrastructure wastewater treatment system according to claim 1 is characterized by: The collecting mechanism A includes a return slurry flocculation device for collecting and temporarily storing formation return mud and a solid-liquid separation device for filter pressing the return slurry; the collecting mechanism B includes a collecting trough arranged around the equipment cleaning sewage outlet and sunk to collect cleaning wastewater, the collecting trough has a lowest position connected to a guide pipe, and the water outlet end of the guide pipe is connected to a rolling mesh screen for dynamic filtration; the rolling mesh screen includes an inclined and rotating mesh screen, and a spiral water baffle arranged radially is arranged inside the mesh screen, and the diameter of the mesh screen gradually decreases from top to bottom.

3. The integrated infrastructure wastewater treatment system according to claim 1 is characterized by: The grid filter device comprises a box for storing mixed sewage, a water inlet is arranged in the middle of the upper part of the box, water outlets are arranged on both sides of the box, and at least one filter net is vertically arranged in the box near any water outlet.

4. The integrated infrastructure wastewater treatment system according to any one of claims 1 to 3, characterized in that: The neutralization reaction tank is provided with a pH sensor electrically connected to the intelligent monitoring unit, and the intelligent monitoring unit is also communicatively connected with a dosing mechanism for adding a pH value adjusting agent to the neutralization reaction tank. The intelligent monitoring unit generates a pH value according to the real-time pH value collected by the pH sensor. actual pH value preset by the system set The difference between them sends a medicine delivery signal to the medicine delivery mechanism. The actual medicine delivery amount u(t) of the medicine delivery mechanism is realized by the following dynamic control algorithm: Where e(t) = pH set -pH actual (t), which represents the real-time pH difference; K p , K i , K d They represent the proportional, integral, and differential coefficients of PID control respectively; α represents the feedforward compensation coefficient, which is calculated based on the wastewater flow Q and pollutant concentration C waste Calculation; Q represents the instantaneous flow rate of wastewater, which is obtained by real-time collection of flowmeter; C waste Represents the initial acid-base equivalent concentration of wastewater, obtained through experimental calibration or online detection.

5. The integrated infrastructure wastewater treatment system according to claim 4 is characterized by: The intelligent monitoring unit also includes a dynamic calibration module, which stores a program for dynamically adjusting the proportional, integral, and differential coefficients of PID control according to the real-time pH difference and the rate of change, specifically including the proportional coefficient K p K p =K p0 ·(1+β·|e(t)| Among them, K p0 represents the basic proportionality coefficient, with a value of 0.5-2.0; β represents the sensitivity factor, the greater the deviation, the greater the K p The faster the increase, the faster the acceleration; Integration coefficient K i Among them, K i0 Represents the basic integral coefficient, with a value of 0.5-2.0; Differential coefficient K d Among them, K d0 represents the basic differential coefficient, with a value of 0.1-0.5; γ represents the damping factor, which suppresses the violent fluctuations caused by mutations.

6. The integrated infrastructure wastewater treatment system according to claim 4 is characterized by: The intelligent monitoring unit further includes a feedforward compensation optimization module for optimizing the feedforward compensation coefficient α, wherein the feedforward compensation optimization module stores an executable determination program of the feedforward compensation coefficient α, specifically: Among them, C target C stands for target neutralization equivalent; chemical The concentration of the active ingredient of the drug; η represents the reaction efficiency of the drug under actual conditions.

7. The integrated infrastructure wastewater treatment system according to claim 1 is characterized by: The high-efficiency flocculation sedimentation tank is provided with a flocculant delivery mechanism controlled by the intelligent monitoring unit, and the flocculant delivered by the flocculant delivery mechanism consists of 50%-60% of polyaluminium chloride, 20%-30% of polyferric sulfate, 5%-8% of anionic polyacrylamide, 3%-5% of zwitterionic polyacrylamide, 1%-2% of modified nano-silicon dioxide, 0.5%-1% of graphene oxide, 0.5%-1% of sodium citrate and 1%-2% of polydimethyldiallylammonium chloride in terms of weight content percentage.

8. The integrated infrastructure wastewater treatment system according to claim 1 is characterized by: A plurality of Φ25×50 mm composite porous conductive biological fillers are suspended in the biochemical reaction pool through a stainless steel mesh cage. The biological fillers include a skeleton layer made of a high-density polyethylene three-dimensional grid, a porous matrix layer composed of polyurethane foam and activated carbon powder wrapped outside the skeleton layer, a bioaffinity layer composed of polyvinyl alcohol gel outside the porous matrix layer, and a conductive functional layer arranged outside the bioaffinity layer for promoting electron transfer and accelerating denitrification and anaerobic ammonia oxidation. The conductive functional layer is formed by spraying carbon nanotubes and graphene dispersion in a 1:1 ratio and thermally reducing them at 80° C. for 2 hours.

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