CN114163087A - Rural sewage treatment system of modularization intelligence - Google Patents

Rural sewage treatment system of modularization intelligence Download PDF

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Publication number
CN114163087A
CN114163087A CN202111581779.7A CN202111581779A CN114163087A CN 114163087 A CN114163087 A CN 114163087A CN 202111581779 A CN202111581779 A CN 202111581779A CN 114163087 A CN114163087 A CN 114163087A
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module
anoxic
aerobic
stage
sewage treatment
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CN114163087B (en
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魏维利
赵雪莲
张菲
李玲
曲喜杰
王维
张鑫阳
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Beijing John International Water Affaires Co ltd
Beijing Sound Environmental Engineering Co Ltd
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Beijing John International Water Affaires Co ltd
Beijing Sound Environmental Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/14—Activated sludge processes using surface aeration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a modularized intelligent rural sewage treatment system, which comprises: the pretreatment module is provided with a water inlet end and a water outlet end, and the water outlet end is respectively connected with the water inlet ends of the anoxic anaerobic module and each stage of anoxic aerobic module; the anoxic anaerobic module is sequentially connected with each stage of anoxic aerobic modules, the sedimentation module, the depth filtering module and the disinfection module; the dosing and phosphorus removal module is connected with the precipitation module, and the sludge return end of the precipitation module is respectively connected to the bottoms of the anoxic anaerobic module and the first-stage anoxic aerobic module; the rear end of the disinfection module is provided with a water outlet end; the DO analyzer is arranged in an aerobic zone of the last stage of anoxic and aerobic module of the multistage anoxic and aerobic modules; the intelligent regulation and control early warning equipment is electrically connected with the aeration devices of all levels of anoxic and aerobic modules, and when the conditions are met, the aeration devices of all levels of anoxic and aerobic modules are started to aerate according to the preset time or give an alarm correspondingly. Because the sewage treatment system is composed of a plurality of modules, the sewage treatment system is convenient to disassemble, assemble and transport, and the convenience and the effect of rural sewage treatment are improved.

Description

Rural sewage treatment system of modularization intelligence
Technical Field
The invention relates to the field of rural sewage treatment, in particular to a modular intelligent rural sewage treatment system.
Background
At present, the decentralized sewage treatment process in rural areas of China mainly comprises the following steps: ecological treatment process, biological treatment process and combined process; the ecological treatment process comprises a stabilization pond, an artificial wetland and a land treatment process; the biological treatment process comprises a septic tank, an anaerobic process, a common activated sludge method, an AO/A2O method, a biological rotating disc, a biological contact oxidation method, an SBR method and the like, and a popular MBR process at present; the combined process comprises ecological combination, biological combination and mutual combined processes among the ecological combination and the biological combination. Septic tanks and biological anaerobic technologies are used more in rural areas. However, the decentralized rural sewage treatment processes still cannot meet the current rural sewage treatment requirements of China, along with the improvement of the rural sewage discharge requirements, the gradual improvement of the mechanism policy of the water pollution treatment system, the implementation of a central environmental protection supervision group and the like, the requirements on the technical equipment quality and the stable standard reaching of the running full index of the rural sewage treatment facilities become stricter and stricter, and a plurality of treatment facilities cannot complete the rural domestic sewage treatment tasks of China.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a modular intelligent rural sewage treatment system which can well solve the problems of inconvenient rural traffic and transportation, low carbon-nitrogen ratio of sewage quality, poor nitrogen and phosphorus removal effect of the sewage treatment system, high operation and maintenance difficulty and the like.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a modularized intelligent rural sewage treatment system, which comprises:
the system comprises a pretreatment module, an anoxic anaerobic module, a multi-stage anoxic aerobic module, a precipitation module, a depth filtration module, a dosing and dephosphorization module, a disinfection module and intelligent regulation and control early warning equipment; wherein,
the pretreatment module is provided with a water inlet end and a water outlet end, and the water outlet end is respectively connected with the water inlet ends of the anoxic anaerobic module and each stage of anoxic aerobic module;
the anoxic anaerobic module is sequentially connected with each stage of anoxic aerobic modules, the sedimentation module, the depth filtering module and the disinfection module;
the dosing and phosphorus removal module is connected with the precipitation module, and the sludge return end of the precipitation module is respectively connected to the bottoms of the anoxic anaerobic module and the first-stage anoxic aerobic module;
the rear end of the disinfection module is provided with a water outlet end;
the DO analyzer of the intelligent regulation and control early warning device is arranged in an aerobic zone of the last stage of anoxic and aerobic module of the multistage anoxic and aerobic modules;
the intelligent regulation and control early warning device is electrically connected with the aeration devices of all stages of anoxic and aerobic modules of the multistage anoxic and aerobic modules, and can start the aeration devices of all stages of anoxic and aerobic modules when the DO value of the aerobic zone of the last stage of anoxic and aerobic modules measured by the DO analyzer reaches a preset aeration start-stop DO value, so as to carry out aeration according to a preset time or carry out corresponding alarm according to the state of a fan of the aeration devices.
Compared with the prior art, the modular rural sewage treatment system provided by the invention has the beneficial effects that:
through setting up the pretreatment module that connects gradually, oxygen deficiency anaerobism module, multistage oxygen deficiency aerobic module, deposit the module, depth filtration module and disinfection module, and connect the medicine dephosphorization module on depositing the module, through mud back flow to oxygen deficiency anaerobism module segmentation backward flow mud, the water of going out by the pretreatment module is to oxygen deficiency anaerobism module and oxygen deficiency aerobic module segmentation water intake at different levels, better intensive denitrogenation and intensive dephosphorization effect have been realized, the quality of water after each module treatment can reach the required water quality standard. The system is composed of a plurality of modules, is a sewage treatment system with a modular structure and is convenient to combine, disassemble, assemble and transport, and the convenience and treatment effect of rural sewage treatment are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a modular rural sewage treatment system according to an embodiment of the present invention;
FIG. 2 is a control flow chart of an intelligent regulation and control early warning device of the modular rural sewage treatment system provided by the embodiment of the invention;
in the figure: 1-a pre-processing module; 2-an anoxic anaerobic module; 3-a first stage anoxic and aerobic module; 4-a second-stage anoxic and aerobic module; 5-N grade anoxic and aerobic modules; 6-a precipitation module; 7-a depth filtration module; 8-a disinfection module; 9-adding a phosphorus removal module; a 10-DO probe; and 3, intelligently regulating and controlling the early warning equipment.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below by combining the specific content of the invention; it is to be understood that the described embodiments are merely exemplary of the invention, and are not intended to limit the invention to the particular forms disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The term "consisting of … …" is meant to exclude any technical feature elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only to the elements explicitly recited in that clause, and elements recited in other clauses are not excluded from the overall claims.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured," etc., are to be construed broadly, as for example: can be fixedly connected, can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 ~ 8" is recited, then the numerical range should be interpreted to include ranges of "2 ~ 7", "2 ~ 6", "5 ~ 7", "3 ~ 4 and 6 ~ 7", "3 ~ 5 and 7", "2 and 5 ~ 7", and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not intended to imply or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting herein.
The modular rural sewage treatment system provided by the invention is described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer. The reagents or instruments used in the examples of the present invention are not specified by manufacturers, and are all conventional products available by commercial purchase.
As shown in fig. 1, an embodiment of the present invention provides a modular intelligent rural sewage treatment system, including:
the system comprises a pretreatment module, an anoxic anaerobic module, a multi-stage anoxic aerobic module, a precipitation module, a depth filtration module, a dosing and dephosphorization module, a disinfection module and intelligent regulation and control early warning equipment; wherein,
the pretreatment module is provided with a water inlet end and a water outlet end, and the water outlet end is respectively connected with the water inlet ends of the anoxic anaerobic module and each stage of anoxic aerobic module;
the anoxic anaerobic module is sequentially connected with each stage of anoxic aerobic modules, the sedimentation module, the depth filtering module and the disinfection module;
the dosing and phosphorus removal module is connected with the precipitation module, and the sludge return end of the precipitation module is respectively connected to the bottoms of the anoxic anaerobic module and the first-stage anoxic aerobic module;
the rear end of the disinfection module is provided with a water outlet end;
the DO analyzer in the intelligent regulation and control early warning device is arranged in an aerobic zone of the last stage of anoxic and aerobic module of the multistage anoxic and aerobic modules;
the intelligent regulation and control early warning device is electrically connected with the aeration devices of all stages of anoxic and aerobic modules of the multistage anoxic and aerobic modules, and can start the aeration devices of all stages of anoxic and aerobic modules when the DO value of the aerobic zone of the last stage of anoxic and aerobic modules measured by the DO analyzer reaches a preset aeration start-stop DO value, so as to carry out aeration according to a preset time or carry out corresponding alarm according to the state of a fan of the aeration devices.
Specifically, the aeration control mode of the intelligent regulation and control early warning device is as follows:
controlling the DO value of the aerobic zone of the last stage of anoxic and aerobic module to be 2-5mg/L by a DO analyzer, and regulating and controlling the start-stop time of the aeration device of each stage of anoxic and aerobic module according to the change of the DO value of the last stage of aerobic zone;
the method comprises the following steps: in the first 8 minutes of each aeration period, DO monitoring is not carried out, the numerical value is read every 1min after continuous aeration is carried out for 8min, and the DO monitoring is only carried out in the aeration period; the initial value of the aeration start-stop time is set as follows: open 30min, stop 5min, set the upper limit as: open 55min, stop 5min, set the lower limit as: starting for 10min and stopping for 5 min; the regulation and control method comprises the following steps: if the monitored DO average value is less than 2mg/L, the opening time of the aeration device is increased by 5min, and the stopping time is unchanged; if the monitored DO average value is between 2 and 5mg/L, the start-stop time of the aeration device is kept unchanged; if the monitored DO average value is more than 5mg/L, the opening time of the aeration device is reduced by 5min, and the stopping time is unchanged; after the starting time of the aerator is adjusted, continuously running for three periods and then starting DO monitoring; and (3) system alarming: if the DO average value is monitored to be larger than 5mg/L for 5 times continuously, the regulation and control early warning device sends an alarm for displaying large air volume of a fan of the aeration device, wherein the alarm can be given in a WeChat or short message mode through a communication connection mode; if the DO average value is monitored to be less than 2mg/L for 5 times continuously, the regulation and control early warning device sends an alarm for displaying the insufficient air volume of the fan of the aeration device, wherein the alarm can be given in a mode of WeChat or short message through a communication connection mode; in addition, the parameter setting can be manually adjusted according to different items. The operation condition of the intelligent automatic control system through DO parameter change can realize intelligent control of the modular rural sewage treatment system, reduce project operation and maintenance cost, improve operation and maintenance efficiency and ensure long-term stable operation of the project.
Among the above-mentioned sewage treatment system, intelligent control early warning equipment includes:
the device comprises a DO analyzer, an alarm device, a communication device, an aeration control device and a cloud server; wherein,
the DO analyzer is in communication connection with the cloud server through the communication device and can send the measured DO value of the aerobic zone of the last stage of anoxic and aerobic module to the cloud server;
when the received DO value of the aerobic zone of the last stage of anoxic and aerobic module reaches a preset DO value for starting and stopping aeration, the cloud server sends a corresponding aeration control instruction to the aeration control device or sends a corresponding alarm instruction to the alarm device;
the aeration control device is respectively electrically connected with the aeration devices of all levels of anoxic and aerobic modules, is in communication connection with the cloud server through the communication device, and can control the aeration devices of all levels of anoxic and aerobic modules to perform aeration according to preset time according to the aeration control instruction sent by the cloud server;
the alarm device is in communication connection with the cloud server through the communication device and can correspondingly alarm the fan states of the aeration devices of all levels of anoxic and aerobic modules according to the alarm instruction sent by the cloud server.
Preferably, the cloud server in the intelligent regulation and control early warning device can perform statistical analysis on corresponding data by adopting SPSS software. The communication device may be a wired communication device or a wireless communication device. The alarm device can be a fixed terminal and/or a mobile terminal, such as a mobile phone, a tablet and the like, and can conveniently give an alarm to a manager of the sewage treatment system through short messages, WeChat and other forms.
By adopting the intelligent regulation and control early warning equipment with the specific structure, the intelligent control operation of the sewage treatment system can be realized, and the treatment effect is ensured.
In the sewage treatment system, the pretreatment module consists of the filtering grids and the regulating tank which are connected in sequence, and can intercept scum and regulate water quantity and water quality.
In the sewage treatment system, the anoxic anaerobic module consists of an anoxic zone and an anaerobic zone which are arranged in the tank body and are connected in sequence. The method is mainly used for denitrification and anaerobic phosphorus release and organic matter degradation.
In the sewage treatment system, the multistage anoxic and aerobic module adopts a two-stage treatment structure consisting of a first stage anoxic and aerobic module and a second stage anoxic and aerobic module which are sequentially connected;
or a multi-stage treatment structure consisting of a first stage anoxic and aerobic module, a second stage anoxic and aerobic module and an N stage anoxic and aerobic module which are connected in sequence is adopted.
The above-mentioned oxygen deficiency aerobic module at each level all includes: the reaction tank is internally provided with an anoxic zone and an aerobic zone which are sequentially connected; and an aeration device is arranged at the bottom of the aerobic zone and is connected with an external fan. The multi-stage anoxic and aerobic module is mainly used for organic matter degradation, denitrification and dephosphorization.
In the sewage treatment system, the sedimentation module adopts a sedimentation tank, a central cylinder is arranged in the sedimentation tank, and a gas stirring device is arranged in the central cylinder; the upper end of the central cylinder is connected with the dosing and phosphorus removing module;
the depth filtering module adopts a sand filtering device, and the sand filtering device is connected with a back washing pipeline.
In the above-mentioned sewage treatment system, add medicine dephosphorization module and include: and the dosing device is connected with the precipitation module through a dosing pipeline.
The precipitation module and the depth filtration module are mainly used for solid-liquid separation, and the dosing and phosphorus removal module is mainly used for supplementing biological phosphorus removal and further strengthening phosphorus.
In the above sewage treatment system, the disinfection module adopts an integrated ultraviolet disinfection device. The disinfection module mainly performs sterilization.
In the sewage treatment system, sewage is treated by the modules in sequence, and full-index standard discharge is realized. The modules are designed in a serialization, standardization and modularization mode according to different scales, transportation is convenient, the modules are only required to be connected in series through pipelines in field installation, field fast assembly can be achieved, the limitation of regions and transportation is broken, and the system is more suitable for being used in rural areas.
The sewage treatment system can realize enhanced denitrification, sewage enters an anoxic zone of an anoxic anaerobic module and anoxic zones of anoxic aerobic modules of a multi-stage anoxic aerobic module respectively in a certain proportion from a regulating reservoir of a pretreatment module by arranging multi-stage water inlet and multi-stage backflow, and sludge of a precipitation module respectively returns to the anoxic zone of the anoxic anaerobic module and the anoxic zone of a first-stage anoxic aerobic module in a certain proportion; the anoxic zones of the anoxic anaerobic module and the first-stage anoxic aerobic module provide carbon sources through water inflow in a certain proportion, and provide nitrifying liquid through sludge reflux in a certain proportion, so that favorable conditions are provided for denitrification and mainly denitrification is performed. The anoxic zone of the second-stage (or Nth-stage) anoxic aerobic module provides a carbon source through a certain proportion of inlet water, and the aerobic zone of the previous stage provides nitrifying liquid for denitrification; the multistage is intake and is supplemented the carbon source to a certain extent, combines the multistage backward flow to provide the advantage for the denitrification process, alleviates the not enough problem of sewage denitrogenation carbon source of low carbon-nitrogen ratio, improves system's denitrogenation effect, is applicable to the domestic sewage treatment of rural low carbon-nitrogen ratio more.
The sewage treatment system can realize enhanced phosphorus removal: nitrate nitrogen in the sludge reflux liquid is consumed by the anoxic zone of the anoxic anaerobic module, an absolute anaerobic environment is provided for phosphorus release of the anaerobic zone, phosphorus release by phosphorus accumulating bacteria is facilitated, phosphorus release by the phosphorus accumulating bacteria is maximized, the follow-up aerobic zone of the anoxic/aerobic module can absorb phosphorus to the maximum extent, and the aim of enhancing biological phosphorus removal is fulfilled by combining with the periodical sludge discharge of the precipitation module; in addition, a gas stirring device is arranged in a central cylinder of the precipitation module, and a phosphorus removal agent is added to remove phosphorus, so as to supplement biological phosphorus removal. Ensure the TP index to stably reach the standard. The dosing mode is simple, convenient and efficient, and is suitable for rural small-scale sewage treatment.
Compared with the existing rural sewage treatment process system, the sewage treatment system has the following effects:
(1) the standardized and modular design is adopted, the production speed is high, the construction period is short, the limitation of regions and transportation is broken, and the method is more suitable for being used in rural areas.
(2) The multistage A/O process is optimized, multi-stage water inflow and multi-stage backflow are adopted, denitrification is enhanced, and the method is more suitable for domestic sewage treatment with low carbon-nitrogen ratio in rural areas of China.
(3) When biological phosphorus removal is enhanced, a simple and efficient dosing mode is adopted to assist dosing and phosphorus removal, the method is suitable for rural small-scale sewage treatment, and TP indexes are guaranteed to reach the standard stably.
(4) The operating condition of the intelligent automatic control system for DO parameter change is adopted, so that the intelligent control of the modular rural sewage treatment process is realized, the project operation and maintenance cost is reduced, the operation and maintenance efficiency is improved, and the long-term stable operation of the project is ensured.
(5) The system can be flexibly designed and matched according to the water quantity and the water quality to be treated, has small floor area, low investment and operation cost, strong impact load resistance, good treatment effect and simple operation and maintenance, and can realize unattended operation.
In order to more clearly show the technical solutions and the technical effects provided by the present invention, the modular rural sewage treatment system provided by the embodiment of the present invention is described in detail with specific embodiments below.
Examples
As shown in fig. 1, the embodiment of the invention provides a modular rural sewage treatment system, which can treat rural domestic sewage, wherein the quality of the treated domestic sewage is as follows: water temperature is 8-25 ℃, COD is less than or equal to 500mg/L, BOD5≤250mg/L，SS≤200mg/L，NH4+-N≤40mg/L，TN≤55mg/L，TP≤6mg/L，pH＝6～9。
The specific treatment mode comprises the following steps:
(1) and (3) standardization treatment: sewage is treated by the pretreatment module, the anoxic anaerobic module, the two-stage (or multi-stage) anoxic aerobic module, the precipitation module, the deep filtration module and the disinfection module of the modular intelligent rural sewage treatment system in sequence; the pretreatment module mainly carries out scum interception and water quantity and quality adjustment; the anoxic anaerobic module mainly performs denitrification and anaerobic phosphorus release and organic matter degradation at the same time; the two-stage (or multi-stage) anoxic and aerobic module is mainly used for organic matter degradation, denitrification and dephosphorization; the precipitation module and the depth filtration module are mainly used for solid-liquid separation, and the dosing and phosphorus removal module is mainly used for supplementing biological phosphorus removal and further strengthening phosphorus treatment; the disinfection module is mainly used for sterilizing;
(2) enhanced denitrification treatment: the system is provided with a plurality of sections of water inflow and a plurality of sections of reflux, sewage enters the anoxic zone of each grade of anoxic and aerobic module as a biochemical unit from the regulating tank of the pretreatment module respectively in a certain proportion, and sludge in the sedimentation tank as a sedimentation module respectively returns to the anoxic zone of the anoxic and anaerobic module and the anoxic zone of the first grade anoxic and aerobic module in a certain proportion. The anoxic zones of the anoxic/anaerobic module and the first-stage anoxic/aerobic module provide carbon sources through inflow water in a certain proportion, and provide nitrifying liquid through sludge reflux liquid in a certain proportion, so that favorable conditions are provided for denitrification and mainly denitrification. The anoxic zone of the second-stage (N-stage) anoxic/aerobic module provides a carbon source through a certain proportion of inlet water, and the aerobic zone of the previous stage provides nitrifying liquid for denitrification.
(3) Enhanced phosphorus removal treatment: nitrate nitrogen in the sludge reflux liquid is consumed by the anoxic zone of the anoxic/anaerobic module, an absolute anaerobic environment is provided for phosphorus release of the anaerobic zone, phosphorus release by phosphorus accumulating bacteria is facilitated, phosphorus release by the phosphorus accumulating bacteria is maximized, the follow-up aerobic zone of the anoxic/aerobic module can absorb phosphorus to the maximum extent, and the aim of enhancing biological phosphorus removal is fulfilled by combining with the periodic sludge discharge of a sedimentation tank. In addition, a gas stirring device is arranged in the central cylinder of the sedimentation tank, and a phosphorus removal agent is added to remove phosphorus, so as to supplement biological phosphorus removal. Ensure the TP index to stably reach the standard.
(4) Intelligent regulation and control and early warning control: a DO analyzer is arranged in an aerobic zone of the last stage of anoxic/aerobic module, and DO of the last stage of aerobic zone is controlled to be 2-5 mg/L; and regulating and controlling the start-stop time of the aeration system according to the change of the DO value of the last stage aerobic zone. In the first 8 minutes of each aeration period, DO monitoring is not carried out, and the numerical value is read every 1min after continuous aeration for 8 min; DO monitoring was only performed during aeration. The initial value of the aeration start-stop time is set as follows: open 30min, stop 5min, set the upper limit as: open 55min, stop 5min, set the lower limit as: start for 10min, stop for 5 min. The regulation and control method comprises the following steps: if the monitored DO average value is less than 2mg/L, the starting time of an aerator (the aerator refers to a fan of an aeration device) is increased by 5min, and the stopping time is unchanged; if the monitored DO average value is between 2 and 5mg/L, the start-stop time of the aerator is kept unchanged; and if the monitored DO average value is more than 5mg/L, reducing the starting time of the aerator by 5min, and keeping the stopping time unchanged. After the starting time of the aerator is adjusted, continuously running for three periods and then starting DO monitoring; and (3) system alarming: if the DO average value is monitored to be larger than 5mg/L for 5 times continuously, the intelligent regulation and control early warning equipment gives an alarm in a mode of WeChat or short message, and the air quantity of the fan is displayed to be large. If the DO average value is monitored to be less than 2mg/L for 5 times continuously, the intelligent regulation and control early warning equipment gives an alarm in a mode of WeChat or short message, and the insufficient air quantity of the fan is displayed. By means of the DO parameter change intelligent automatic control system operation condition, intelligent control of the modular rural sewage treatment process can be achieved, project operation and maintenance cost is reduced, operation and maintenance efficiency is improved, and long-term stable operation of the project is guaranteed.
The effluent quality after the treatment is as follows: the water temperature is 8-25 ℃, the COD is less than or equal to 50mg/L, and the BOD5≤10mg/L，SS≤10mg/L，NH45mg/L or less of +/-N, 15mg/L or less of TN, 0.5mg/L or less of TP and 6-9 of pH. As can be seen, the systemThe effluent can reach GB18919-2002 first-grade A standard.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (10)

1. The utility model provides a rural sewage treatment system of modularization intelligence which characterized in that includes:
the system comprises a pretreatment module, an anoxic anaerobic module, a multi-stage anoxic aerobic module, a precipitation module, a depth filtration module, a dosing and dephosphorization module, a disinfection module and intelligent regulation and control early warning equipment; wherein,
the pretreatment module is provided with a water inlet end and a water outlet end, and the water outlet end is respectively connected with the water inlet ends of the anoxic anaerobic module and each stage of anoxic aerobic module;
the anoxic anaerobic module is sequentially connected with anoxic aerobic modules, sedimentation modules, depth filtering modules and disinfection modules at all levels;
the dosing and phosphorus removal module is connected with the precipitation module, and the sludge return end of the precipitation module is respectively connected to the bottoms of the anoxic anaerobic module and the first-stage anoxic aerobic module;
the rear end of the disinfection module is provided with a water outlet end;
the DO analyzer in the intelligent regulation and control early warning device is arranged in an aerobic zone of the last stage of anoxic and aerobic module of the multistage anoxic and aerobic modules;
the intelligent regulation and control early warning device is electrically connected with the aeration devices of all stages of anoxic and aerobic modules of the multistage anoxic and aerobic modules, and can start the aeration devices of all stages of anoxic and aerobic modules when the DO value of the aerobic zone of the last stage of anoxic and aerobic modules measured by the DO analyzer reaches a preset aeration start-stop DO value, so as to carry out aeration according to a preset time or carry out corresponding alarm according to the state of a fan of the aeration devices.
2. The modular intelligent rural sewage treatment system of claim 1, wherein the intelligent regulation and warning device comprises:
the device comprises a DO analyzer, an alarm device, a communication device, an aeration control device and a cloud server; wherein,
the DO analyzer is in communication connection with the cloud server through the communication device and can send the measured DO value of the aerobic zone of the last stage of anoxic and aerobic module to the cloud server;
when the received DO value of the aerobic zone of the last stage of anoxic and aerobic module reaches a preset DO value for starting and stopping aeration, the cloud server sends a corresponding aeration control instruction to the aeration control device or sends a corresponding alarm instruction to the alarm device;
the aeration control device is respectively electrically connected with the aeration devices of all levels of anoxic and aerobic modules, is in communication connection with the cloud server through the communication device, and can control the aeration devices of all levels of anoxic and aerobic modules to perform aeration according to preset time according to the aeration control instruction sent by the cloud server;
the alarm device is in communication connection with the cloud server through the communication device and can correspondingly alarm the fan states of the aeration devices of all levels of anoxic and aerobic modules according to the alarm instruction sent by the cloud server.
3. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein the pretreatment module is comprised of a filtration grate and a conditioning tank connected in series.
4. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein the anoxic anaerobic module is comprised of an anoxic zone and an anaerobic zone disposed within the tank body in sequential connection.
5. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein the multi-stage anoxic and aerobic module adopts a two-stage treatment structure consisting of a first stage anoxic and aerobic module and a second stage anoxic and aerobic module which are connected in sequence;
or a multi-stage treatment structure consisting of a first stage anoxic and aerobic module, a second stage anoxic and aerobic module and an N stage anoxic and aerobic module which are connected in sequence is adopted.
6. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein each stage of anoxic and aerobic modules comprises:
the reaction tank is internally provided with an anoxic zone and an aerobic zone which are sequentially connected;
and an aeration device is arranged at the bottom of the aerobic zone and is connected with an external fan.
7. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein the sedimentation module is a sedimentation tank having a central cylinder therein, the central cylinder having a gas agitation device therein;
the upper end of the central cylinder is connected with the dosing and phosphorus removal module.
8. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein the depth filtration module employs a sand filtration device with a backwash line connected thereto.
9. The modular intelligent rural sewage treatment system of claim 1 or 2, wherein the dosing and phosphorus removal module comprises: and the dosing device is connected with the precipitation module through a dosing pipeline.
10. The modular intelligent rural sewage treatment system of claim 1 or 2 wherein the disinfection module employs an integrated ultraviolet disinfection device.
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