CN114560599B - Flow-dividing urban sewage plant and operation control method thereof - Google Patents

Flow-dividing urban sewage plant and operation control method thereof Download PDF

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Publication number
CN114560599B
CN114560599B CN202210262420.1A CN202210262420A CN114560599B CN 114560599 B CN114560599 B CN 114560599B CN 202210262420 A CN202210262420 A CN 202210262420A CN 114560599 B CN114560599 B CN 114560599B
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variable
treatment system
pipe
water
treatment
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CN114560599A (en
Inventor
詹卫东
林甲
王丽滨
徐旭
花文胜
张伟
柳栋升
何万辉
张丹
杨琴
张鹤楠
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Beijing Shouchuang Ecological Environmental Protection Group Co ltd
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Beijing Shouchuang Ecological Environmental Protection Group 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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • 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

Abstract

The invention discloses a split-flow urban sewage plant and an operation control method thereof, wherein the sewage plant comprises the following components: the pretreatment system water outlet pipe is sequentially connected with the variable throughput biochemical treatment and advanced treatment system, and is connected with the advanced treatment system through a bypass pipe; the pretreatment system is connected with the diversion regulation pool through a diversion pipe; a water inlet flowmeter is arranged in the pretreatment system; a bypass control valve is arranged on the bypass pipe; a shunt control valve is arranged on the shunt tube; the variable-treatment-capacity biochemical treatment system is respectively provided with a direct drainage pipe and a normal drainage pipe connected with the water inlet end of the advanced treatment system; the variable-throughput biochemical treatment system is provided with an internal reflux pump, a sludge reflux pump, stirring equipment and aeration equipment; the control system is respectively and electrically connected with the water inlet flowmeter, the biochemical water inlet flowmeter, the bypass control valve, the diversion control valve, the internal reflux pump, the stirring equipment and the aeration equipment, and can control each system to operate in a corresponding mode according to the monitored water inlet flow. The sewage plant can carry out corresponding treatment according to different inflow water.

Description

Flow-dividing urban sewage plant and operation control method thereof
Technical Field
The invention relates to the field of sewage treatment, in particular to a split-flow urban sewage plant and an operation control method thereof.
Background
The diversion drainage system is characterized in that rain and sewage pipe networks are arranged in a diversion mode, one set of rain water pipe is used for discharging rain water runoff generated during rainfall, and the other set of sewage pipe is used for discharging sewage to a downstream sewage plant for treatment and then discharging. According to the prior researches, a drainage system of diversion system is adopted, the water quantity of the sewage pipe during rainfall is generally 3-5 times of dry season flow, and even more than 7 times under extreme conditions (such as 100-200 mm/d of rainfall). The diversion system drainage system designed in the prior art cannot fully consider the huge flow difference in different seasons, and has the problem of overflow pollution of the diversion system sewage pipe, wherein the overflow pollution is mainly caused by rainwater inflow to the sewage pipe of the diversion system due to excessive groundwater infiltration and rainwater and sewage misconnection.
At present, the actual water quantity of the diversion sewage treatment plant flowing into the south city is far higher than the sewage water quantity considered according to the design principle of the traditional diversion sewage treatment plant because of the large number of urban river networks in the south city of China and the high ground water level (the higher water level in the flood season). The sewage plant designed by adopting the traditional split flow design principle has limited hydraulic bearing capacity, so that the systematic problem caused by the increase of hydraulic load can not be relieved rapidly in many cases. Such as: china The high water level operation of the drainage pipe network in the south city and the increase of water quantity caused by rainfall are all caused by the limited hydraulic load capacity of the sewage plant. For example: (1) Various reasons cause high water level operation of a plurality of drainage pipe networks in China, and a large amount of sewage cannot be treated in time and is stored in the drainage pipe networks for a long time, so that the following effects are caused: the serious siltation in the pipe network reduces the effective water-passing capacity of the pipe network, and increases the dredging difficulty, the danger and the maintenance cost of the pipe network; the carbon source of the inlet water of the sewage treatment plant is reduced, which is unfavorable for effectively realizing the biological dephosphorization and denitrification effect; the sewage overflows out of the pipe network to pollute the water environment and the like during the drainage peak time; (2) Most of sewage is directly discharged outside untreated during rainfall to form split-flow overflow pollution and combined-flow overflow pollution formed by combined-flow drainage pipe networks in old urban areas, so that serious pollution is caused to the environment, and the main manifestations are as follows: if the urban drainage pipe network is mainly divided into 100,000m 3 The inflow of the basic flow of the sewage plant of the design scale/d is 100,000m on average in dry seasons 3 Sewage around/d, but the peak flow of inflow and seepage water entering the downstream sewage plant caused by the staggered pipe network in rainfall season is basically 2-4 times of the average flow (namely 8,333-16, 667 m) 3 /h or even higher). While the sewage plant is designed according to a split-flow system, the design is more than about 4,167-12,500 m 3 The sewage of/h can not be treated and directly discharged to cause serious pollution to lakes and river channels.
At present, a sewage plant designed by adopting the existing split flow system principle generally only considers the total change coefficient K of the comprehensive living sewage in dry seasons z . According to the outdoor drainage design Specification GB50014-2006 (2014 edition), the total change coefficient K of the comprehensive domestic sewage in dry seasons z In the range of 2.3 to 1.3. Wherein the total change coefficient K z ＝K 1 ·K 2 Wherein the daily coefficient of variation K 1 Maximum daily sewage quantity/average daily sewage quantity; coefficient of time variation K 2 Maximum daily maximum sewage amount/maximum daily average sewage amount; general city lacks K 1 And K 2 Data, and in actual design, K is generally adopted z Data, see table 1 (wherein 1L/s=86.4m 3 /d＝3.6m 3 /h)。
Table 1: kz value of total change coefficient of comprehensive domestic sewage
Such as a sewage plant (using A) of 100,000 tons/day in the southern China city 2 The treatment system of the/O process) is used for illustrating the problems of the existing split-flow sewage design mode, and the design scheme is as follows according to the domestic general design method:
(1) Lifting pump station: average flow rate 100,000m 3 Peak flow was 100,000 ≡24×1.3=5,417 m 3 And/h, arranging 3-4 sewage lifting pumps in parallel according to the peak flow and the lift.
(2) Pretreatment system: average flow rate 100,000m 3 Peak flow rate 100,000 ≡24×1.3=5,417 m 3 And/h, two groups of parallel grids and two groups of parallel grit chambers are generally provided.
(3) Traditional biochemical treatment system: design average flow 100,000m 3 /d, consider A 2 According to the design of an anaerobic tank, an anoxic tank and an aerobic tank, the anoxic tank and the aerobic tank capacity of active sludge are considered according to the design water temperature of 12-14 ℃, the aeration system capacity is considered according to the temperature of 26-28 ℃, the sludge reflux ratio is considered according to 100% of the average flow rate, 2-3 sludge reflux pumps which are connected in parallel are correspondingly arranged, the mixed liquor reflux ratio is considered according to 200-300% of the average flow rate, and 2-3 internal reflux pumps which are connected in parallel are correspondingly arranged, as shown in figure 1.
(4) Secondary sedimentation tank system: at an average flow rate of 100,000m 3 /d(4,167m 3 And/h) designing a secondary sedimentation tank by considering the surface load and considering the water depth of 3.5-4 meters, wherein a parallel secondary sedimentation tank with the diameter of 40-45 meters is generally required for 4 seats.
(5) Depth processing system: average flow rate in dry season 100,000m 3 /d(4,167m 3 Per h), peak flow rate is 100,000 ≡24×1.3=5,417 m 3 And/h, two groups of parallel high-density sedimentation tanks and two groups of parallel deep-bed denitrification filters are generally provided.
The systems are connected in a fixed series mode, and sewage flows from a lifting pump station (1) of the system to an advanced treatment system (5); when the whole sewage plant combined in the above way from the lifting pump station is used in the southern city in China, the common sewage plant can only treat 5,417m in summer in the actual operation process 3 /h (maximum up to 130,000m per day) 3 The flow rate of/d), i.e. the hour flow rate of about 1.3 times the average flow rate, causes that the water volume which is excessive in rainy seasons cannot be treated or overflows through each overflow port or is stored in the drainage pipe network for a long time; in winter, the water temperature is generally about 12-14 ℃, the SVI value of the sludge sedimentation index is generally higher and about 130-180 ml/g.
In summary, it can be seen that, because many southern cities in China have a lot of urban river networks, the underground water level is high (the water level in flood season is higher), the actual water quantity of the diversion sewage treatment plant flowing into these areas is far higher than the sewage water quantity considered according to the design principle of the traditional diversion sewage treatment plant, and the sewage treatment plant constructed by adopting the traditional diversion sewage treatment plant has limited hydraulic bearing capacity, so that the problem of the whole drainage system caused by the increase of hydraulic load can not be relieved rapidly in many cases.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a split-flow municipal sewage plant and an operation control method thereof, which can improve the hydraulic bearing capacity of the split-flow municipal sewage plant and solve the problem that the existing split-flow municipal sewage plant cannot quickly relieve the increase of hydraulic load.
The invention aims at realizing the following technical scheme:
the embodiment of the invention provides a split-flow municipal sewage plant, which comprises the following components:
the pretreatment system (the pretreatment system comprises a primary sedimentation tank system, but the primary sedimentation tank system is not arranged in the south generally), a variable-throughput biochemical treatment system, an advanced treatment system, a bypass pipe, a shunt regulation tank, a water inlet flow meter, a biochemical water inlet flow meter, a bypass control valve, a shunt control valve, a direct discharge control valve, a normal drain valve and a control system; wherein, the liquid crystal display device comprises a liquid crystal display device,
the pretreatment system is provided with a water inlet pipe and a water outlet pipe, and the water outlet pipe is sequentially connected with the variable-throughput biochemical treatment system;
the water outlet pipe of the pretreatment system is connected with the water inlet end of the advanced treatment system through the bypass pipe;
the pretreatment system is connected with the diversion regulation reservoir through the diversion pipe;
the pretreatment system is internally provided with the water inlet flowmeter;
The bypass control valve is arranged on the bypass pipe;
the shunt tube is provided with the shunt control valve;
the biochemical water inlet flowmeter is arranged on a front-end water inlet pipe of the variable-throughput biochemical treatment system;
the tail end of the variable-throughput biochemical treatment system is respectively provided with a straight drainage pipe and a normal drainage pipe connected with the water inlet end of the advanced treatment system, the straight drainage pipe is provided with the straight drainage control valve, and the normal drainage valve is arranged on the normal drainage pipe;
the variable-throughput biochemical treatment system is provided with an internal reflux pump, a sludge reflux pump, stirring equipment and aeration equipment;
the control system is electrically connected with the water inlet flowmeter, the bypass control valve, the normal drain valve, the direct-discharge drain valve, the shunt control valve, the internal reflux pump, the stirring equipment and the aeration equipment respectively, and can correspondingly control the bypass control valve, the normal drain valve, the direct-discharge drain valve, the shunt control valve, the internal reflux pump, the sludge reflux pump, the stirring equipment and the aeration equipment according to the water inlet flow monitored by the water inlet flowmeter, so that the variable-treatment-capacity biochemical treatment system and the advanced treatment system operate in a series mode for treating low flow, a parallel mode for treating medium flow and a shunt parallel and shunt regulation mode for treating high flow.
The embodiment of the invention also provides an operation control method of the split-flow municipal sewage plant, which is used for sewage treatment control of the split-flow municipal sewage plant and comprises the following steps:
when the water inflow flow rate is not more than 2-3 times of the average dry season flow rate through the water inflow flowmeter, the control system controls the number of the internal reflux pumps and the sludge reflux pumps of the variable-treatment-capacity biochemical treatment system to correspond to the increase of the flow rate;
when the water inflow flow rate is monitored to exceed the treatment water amount of the normal operation of the variable-treatment-capacity biochemical treatment system through the water inflow flow meter, the control system controls the conversion of a denitrification zone, a nitrification zone and a sedimentation zone of the variable-treatment-capacity biochemical treatment system to increase the treatment capacity of the variable-treatment-capacity biochemical treatment system to 3-4 times of the average dry season treatment capacity through controlling a control valve and a start-stop stirring device on each aeration branch pipe of the aeration device;
when the water inflow flow rate is monitored to be more than 4-6 times of the average dry season flow rate through the water inflow flowmeter, the control system controls in the following way, and the control system comprises the following steps:
the bypass control valve is controlled to be opened to open the bypass pipe, the direct-discharge control valve is opened to open the direct-discharge drain pipe, the normal control valve is closed to close the normal drain pipe, the variable-treatment-capacity biochemical treatment system and the advanced treatment system in a serial state are converted into parallel operation, and the excess water quantity which cannot be treated by the variable-treatment-capacity biochemical treatment system directly enters the advanced treatment system through the bypass pipe to be subjected to primary strengthening treatment, and is discharged through an independent emergency discharge port after being treated and disinfected;
Or controlling to open the shunt control valve to open the shunt pipe so as to enable more than 4 times of water to directly enter the shunt regulation facility for temporary retention or direct overflow, and if temporary retention treatment is adopted, when the water inflow is not more than 2 times of average dry season flow, serially connecting the sewage stored by the shunt regulation facility back to the variable-throughput biochemical treatment system and the advanced treatment system for normal treatment;
when the water inflow flow rate is monitored to be more than 6 times of the average dry season flow rate through the water inflow flow meter, the control system processes the water quantity exceeding 4 times of the average dry season flow rate in the following control mode: the bypass control valve is controlled to be opened to open the bypass pipe, the direct-discharge control valve is opened to open the direct-discharge drain pipe, the normal control valve is closed to close the normal drain pipe, the variable-treatment-capacity biochemical treatment system and the advanced treatment system in a serial state are converted into parallel operation, and the excess water quantity which cannot be treated by the variable-treatment-capacity biochemical treatment system directly enters the advanced treatment system through the bypass pipe to be subjected to primary strengthening treatment, and is discharged through an independent emergency discharge port after being treated and disinfected; the amount of water exceeding 6 times of the average dry season flow is treated in the following control manner: and controlling to open the shunt control valve to open the shunt pipe so that more than 6 times of water directly enters the shunt regulation facility to be temporarily retained or directly overflowed, and if temporary retention treatment is adopted, when the inflow water flow is recovered to not more than 2 times of average dry season flow, serially connecting the sewage stored by the shunt regulation facility back to the variable-throughput biochemical treatment system and the advanced treatment system for normal treatment.
Compared with the prior art, the split-flow urban sewage plant and the operation control method thereof provided by the invention have the beneficial effects that:
the pretreatment system, the variable-throughput biochemical treatment system and the advanced treatment system are arranged, the pretreatment system is directly connected with the advanced treatment system through the bypass pipe, the diversion regulation and storage tank is connected through the diversion pipe, the water inlet flowmeter, the biochemical water inlet flowmeter, the bypass control valve, the diversion control valve, the direct discharge control valve and the normal drain valve are correspondingly arranged, the control system is respectively connected with and controls the water inlet flowmeter, the biochemical water inlet flowmeter, the bypass control valve, the diversion control valve, the direct discharge control valve and the normal drain valve, the operation description of the sewage plant can be changed according to different water inlet flows, such as a serial operation mode, a parallel operation mode, a serial regulation operation mode, a parallel regulation operation mode and the like, the hydraulic load capacity of the municipal sewage plant is greatly improved, sewage is treated to the maximum extent, the overflow pollution of the diversion drainage system is effectively reduced, and the device is particularly suitable for being used in multiple rainfall areas (such as southern areas in China). The sewage plant is also suitable for modifying the existing sewage plant, greatly saves investment cost, and increases instantaneous water treatment quantity and annual water treatment quantity. The sewage plant well solves the defects of the existing split-flow sewage treatment plant, greatly reduces the investment of infrastructure in the southern city, and effectively reduces the overflow pollution problem of the drainage system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a biochemical treatment system of a conventional municipal sewage plant;
FIG. 2 is a schematic diagram of a split municipal sewage plant according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a variable throughput biochemical treatment system for a split-flow municipal sewage plant according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a dry season operation mode of a variable throughput biochemical treatment system for a split-flow municipal sewage plant according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a rainy season high flow operation mode of a variable throughput biochemical treatment system of a split-flow municipal sewage plant according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a serial operation mode of a variable throughput biochemical treatment system and a deep treatment system of a split-flow municipal sewage plant according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a parallel operation mode of a variable throughput biochemical treatment system and a deep treatment system of a split-flow municipal sewage plant according to an embodiment of the invention;
FIG. 8 is a schematic diagram of a variable throughput biochemical treatment system and a diversion regulation facility of a diversion municipal sewage plant according to an embodiment of the invention;
FIG. 9 is a schematic diagram of a variable throughput biochemical treatment system, a depth treatment system and a diversion regulation facility of a diversion municipal sewage plant according to an embodiment of the invention;
in fig. 2 to 3: 1-a pretreatment system; 101-coarse grid; 102-lifting a pump room; 103-fine grid; 104-a sand setting tank; 105-primary sedimentation tank; 2-variable throughput biochemical treatment system; 201-A2/O variable throughput biochemical treatment unit; 211-an anaerobic tank; 212-biochemical tank (excluding anaerobic tank section); 2121-zone anoxic zone; 2122-two region variable region; 2123-three-zone aerobic zone; 2124-four region variable region; 213-aeration equipment; 214-an aeration main pipe; 215-control valve of two-zone aeration branch pipe; 216-a control valve of a three-zone aeration branch pipe; 217-control valve of four-zone aeration branch pipe; 202-a secondary sedimentation tank; 3-an advanced treatment system; 4-a sludge treatment system; 5-a water inlet flowmeter; 6-a biochemical flowmeter; 7-shunt tube; 8-a split-flow regulation facility; 9-a split control valve; 10-bypass pipe; 11-a bypass control valve; 12-an in-line drain pipe; 13-in-line control valve; 14-normal control valve; 15-a disinfection system; a is a water inlet pipe; b-a water outlet pipe; c, independently sterilizing the water outlet pipe.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below in combination with the specific content of the invention; it will be apparent that the described embodiments are only some embodiments of the invention, but not all embodiments, which do not constitute limitations of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The terms that may be used herein will first be described as follows:
the term "and/or" is intended to mean that either or both may be implemented, e.g., X and/or Y are intended to include both the cases of "X" or "Y" and the cases of "X and Y".
The terms "comprises," "comprising," "includes," "including," "has," "having" or other similar referents are to be construed to cover a non-exclusive inclusion. For example: including a particular feature (e.g., a starting material, component, ingredient, carrier, formulation, material, dimension, part, means, mechanism, apparatus, step, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article of manufacture, etc.), should be construed as including not only a particular feature but also other features known in the art that are not explicitly recited.
The term "consisting of … …" is meant to exclude any technical feature element not explicitly listed. If such term is used in a claim, the term will cause the claim to be closed, such that it does not include technical features other than those specifically listed, except for conventional impurities associated therewith. If the term is intended to appear in only a clause of a claim, it is intended to limit only the elements explicitly recited in that clause, and the elements recited in other clauses are not excluded from the overall claim.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and the like should be construed broadly to include, for example: the connecting device can be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms herein above will be understood by those of ordinary skill in the art as the case may be.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as a range of values, the range is to be understood as specifically disclosing all ranges formed from any pair of upper and lower values within the range of values, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 to 8" is recited, that numerical range should be interpreted to include the ranges of "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", and the like. Unless otherwise indicated, numerical ranges recited herein include both their endpoints and all integers and fractions within the numerical range.
The terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for ease of description and to simplify the description, and do not explicitly or implicitly indicate that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure.
The flow-dividing urban sewage plant and the operation control method thereof provided by the invention are described in detail below. What is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art. The specific conditions are not noted in the examples of the present invention and are carried out according to the conditions conventional in the art or suggested by the manufacturer. The reagents or apparatus used in the examples of the present invention were conventional products commercially available without the manufacturer's knowledge.
As shown in fig. 2, an embodiment of the present invention provides a split municipal sewage plant, including:
The pretreatment system (including a primary sedimentation tank system, but the primary sedimentation tank system is not generally configured), a variable-throughput biochemical treatment system, a deep treatment system, a bypass pipe, a shunt regulation tank, a water inlet flowmeter, a bypass control valve, a shunt control valve, a direct discharge control valve, a normal drain valve and a control system; wherein, the liquid crystal display device comprises a liquid crystal display device,
the pretreatment system is provided with a water inlet pipe and a water outlet pipe, and the water outlet pipe is sequentially connected with the variable-throughput biochemical treatment system;
the water outlet pipe of the pretreatment system is connected with the water inlet end of the advanced treatment system through the bypass pipe;
the pretreatment system is connected with the diversion regulation reservoir through the diversion pipe;
the pretreatment system is internally provided with the water inlet flowmeter;
the bypass control valve is arranged on the bypass pipe;
the shunt tube is provided with the shunt control valve;
the biochemical water inlet flowmeter is arranged on the front end water inlet pipe of the variable-throughput biochemical treatment system so as to monitor and control (a shunt control valve and the like) the maximum hour flow entering the variable-throughput biochemical treatment system:
the tail end of the variable-throughput biochemical treatment system is respectively provided with a straight drainage pipe and a normal drainage pipe connected with the water inlet end of the advanced treatment system, the straight drainage pipe is provided with the straight drainage control valve, and the normal drainage valve is arranged on the normal drainage pipe;
The variable-throughput biochemical treatment system is provided with an internal reflux pump, a sludge reflux pump, stirring equipment and aeration equipment;
the control system is electrically connected with the water inlet flowmeter, the bypass control valve, the normal drain valve, the direct-discharge drain valve, the shunt control valve, the internal reflux pump, the stirring equipment and the aeration equipment respectively, and can correspondingly control the bypass control valve, the normal drain valve, the direct-discharge drain valve, the shunt control valve, the internal reflux pump, the sludge reflux pump, the stirring equipment and the aeration equipment according to the water inlet flow monitored by the water inlet flowmeter, so that the variable-treatment-capacity biochemical treatment system and the advanced treatment system operate in a series mode for treating low flow, a parallel mode for treating medium flow and a shunt parallel and shunt regulation mode for treating high flow.
In the above-mentioned split-flow municipal sewage plant, the pretreatment system comprises:
a coarse grid, a lifting pump room, a fine grid, a sand setting tank and a primary sedimentation tank which are connected in sequence; wherein, the liquid crystal display device comprises a liquid crystal display device,
the front end of the coarse grille is provided with the water inlet pipe, and the rear end of the coarse grille is connected with the pipeline of the lift pump room and is connected with the shunt pipe;
the rear end of the grit chamber is connected with the water inlet end of the advanced treatment system through the bypass pipe;
The rear end of the primary sedimentation tank is connected with the water outlet pipe;
the water inlet flowmeter is arranged on a pipeline between the sand setting tank and the primary sedimentation tank.
Preferably, the preprocessing capability of the preprocessing system is as follows: average flow rate in dry season 100,000m 3 Winter peak flow 6,250m 3 At least 18,750m peak flow in summer rain season 3 And/h, all the treatment facilities, equipment and pipelines are correspondingly equipped according to the peak summer flow, and the minimum passing flow is checked to pass through each structure smoothly.
The processing capacity of the lifting pump station is as follows: the average flow rate in dry season is 100,000m 3 And/d, peak summer flow rate of at least 18,750m 3 Per h, at most 25000m 3 /h。
As shown in fig. 3, in the above-mentioned split-flow municipal sewage plant, the variable-throughput biochemical treatment system is composed of an A2/O variable-throughput biochemical treatment unit and a secondary sedimentation tank which are sequentially connected; wherein, the liquid crystal display device comprises a liquid crystal display device,
the A2/O variable throughput biochemical treatment unit comprises: the anaerobic tank and the biochemical tank are connected in sequence, and the biochemical tank is equally divided into a first anoxic zone, a second variable zone, a third aerobic zone and a fourth variable zone which are connected in sequence;
the four-zone variable zone is connected back to the front end of the anoxic zone of the first zone through an internal reflux pipeline provided with the internal reflux pump;
The aeration equipment is connected with aeration devices in the two-zone variable zone, the three-zone aerobic zone and the four-zone variable zone respectively through aeration branch pipes provided with control valves;
stirring equipment is arranged in the anoxic zone I and the variable zone II;
the secondary sedimentation tank is connected back to the water inlet end of the anaerobic tank through a sludge return pipeline provided with the sludge return pump.
In the variable throughput biochemical treatment system, the sludge reflux pump is 3-4 arranged in parallel; the number of the internal reflux pumps is 2-3 which are arranged in parallel.
According to the variable throughput biochemical treatment system, when the water quantity is increased to 2.5-4 times of the average dry season flow by switching the control valve on each aeration branch pipe, the stirring equipment and the like, a part of denitrification area can be used as a nitrification area, and a part of nitrification area can be used as a sedimentation area, namely: in dry season operation, the whole biochemical pond comprising the denitrification zone and the nitrification zone is assumed to be divided into 4 equal-division spaces, each space occupies 25 percent, and sewage sequentially passes through the first, second, third and fourth equal-division zones (see fig. 3, four equal-division zones are the first anoxic zone, the second variable zone, the third aerobic zone and the fourth variable zone in fig. 3). Wherein: the first and second equally divided regions are denitrification regions in dry season operation, and the third and fourth equally divided regions operate as nitrification regions in aeration, wherein the second equally divided region is provided with an aeration head but does not aerate in dry season (see fig. 4); in rainy season operation, the first aliquoting zone is not aerated as a denitrification zone, the second aliquoting zone and the third aliquoting zone are aerated as a nitrification zone, and the fourth aliquoting zone is not aerated as a precipitation zone (see fig. 5).
The total pollution load is not changed greatly, the concentration of various pollutants in the rainy season is correspondingly reduced along with the increase of the flow rate and the like, and the expansion variable treatment capacity type biochemical treatment system can be generally not considered, but the peak treatment capacity of various equipment is required to be corrected, and the system is changed into multi-mode operation such as dry season flow rate, small rainfall flow rate (2-3 times of dry season flow rate), large rainfall flow rate (3-4 times), ultra-large rainfall flow rate (more than 4 times) and the like; such as: the running mode of the dry season flow and the small rainfall flow (the water quantity is not more than 2-3 times of the dry season flow) is that the sewage is serially run through a pretreatment system, a variable-treatment-capacity biochemical treatment system and a deep treatment system; when the water quantity reaches a high rainfall flow operation set value, the aeration equipment realizes the switching of a denitrification region, a nitrification region and a sedimentation region of the variable-treatment-capacity biochemical treatment system through the switching of a control valve of a control system for controlling each aeration branch pipe, and realizes the removal of various pollutants under the condition of larger water quantity.
In the variable-throughput biochemical treatment system, the A2/O variable-throughput biochemical treatment unit is characterized in that the sludge reflux ratio is measured on the inflow water flow through the inflow water flow meter arranged behind the grit chamber, and the control system is used for controlling the sludge reflux ratio under various working conditions: 100% of the flow rate is adopted in dry seasons, and 50% of the sludge reflux ratio is adopted when the water quantity reaches the maximum; simultaneously, the same inflow water flow measurement signal is adopted to control the reflux ratio of the mixed liquid by controlling the internal reflux pump: the internal reflux ratio can be adjusted to be 200-400% of the average dry season flow in dry season, and the maximum internal reflux ratio is 400%, and the internal reflux pump is fully opened when the water quantity is maximum, and the internal reflux ratio is reduced to 100%.
In the variable throughput biochemical treatment system, the secondary sedimentation tank is matched with precipitation process parameters of peak flow rates in winter and summer, namely the sludge concentration in winter of the secondary sedimentation tank is 3-5 g/l, the surface area of the secondary sedimentation tank is obtained through a surface hydraulic load formula (surface load=flow rate/secondary sedimentation tank surface area), the surface load of dry seasons is selected to be generally 0.5-1.5 m/h, and the peak flow rate in winter is 6250m 3 Consider/h; the concentration of the sludge in summer of the secondary sedimentation tank is 2.5-4 g/l, and 14,580m is adopted according to the peak flow in summer 3 Consider/h; in addition to the above flow consideration, a proper diameter and a proper number of secondary sedimentation tanks may be employed according to the sewage characteristic differences between winter and summer.
In the split-flow urban sewage plant, all pipelines and related water delivery and distribution facilities in the sewage plant adopt a hydraulic load design with the average flow rate not less than 4 times. Preferably, all the pipes and associated water distribution facilities are designed with a hydraulic load at least 4 times and at most 6 times the average flow. If newly built, the passage of the multiple flows is directly considered in the pipeline design, and if the multiple flows are modified, the multiple flows can be realized by adding parallel pipelines.
Preferably, in the above-mentioned diversion municipal sewage plant, the diversion regulation facility generally considers that the flow rate exceeds the average flow rate in dry season by more than 4 to 6 times when only rainfall is stored, and generally considers that the retention time is the pool capacity of the flow rate in dry season for 6 hours, and the excess water quantity exceeds the storage amount and has to overflow and be discharged directly.
In the above-mentioned split-flow urban sewage plant, the advanced treatment system: in winter, the secondary sedimentation tank is discharged and enters a deep treatment system for treatment; the effluent of the secondary sedimentation tank passes through an advanced treatment system (such as a high-density sedimentation tank or/and a filter tank) in normal flow in summer, and the water quantity exceeds 14580m 3 After/h (can be selected between 12500 and 16660m3/h according to actual conditions), the control system monitors and controls the bypass control valve through the inflowThe opening and the adjustment are changed into the direct discharge of the secondary sedimentation tank effluent, the redundant water inflow is used in parallel by a bypass pipe and a bypass control valve, the variable-treatment-capacity biochemical treatment system and the advanced treatment are used in parallel, and the sewage entering the advanced treatment system is subjected to primary strengthening treatment and is discharged through an independent discharge port.
In the split-flow municipal sewage plant, the inner part of the disinfection system is divided into two grids, and the two disinfection areas are arranged, so that water can be respectively fed into the two disinfection areas and discharged after disinfection. Wherein a grid disinfection area is used for disinfecting sewage directly discharged into the advanced treatment system by the pretreatment system.
The above-mentioned split system urban sewage plant still includes: the sludge treatment system is respectively connected with the sludge discharge ports of the pretreatment system and the variable-treatment-capacity biochemical treatment system.
Referring to fig. 6 to 9, the embodiment of the invention further provides an operation control method of the split-system municipal sewage plant, which is used for controlling sewage treatment of the split-system municipal sewage plant, and comprises the following steps:
when the water inflow flow rate is not more than 2-3 times of the average dry season flow rate through the water inflow flowmeter, the control system controls the number of the internal reflux pumps and the sludge reflux pumps of the variable-treatment-capacity biochemical treatment system to correspond to the increase of the flow rate; with the great increase of the water quantity, the number of the internal reflux pumps and the sludge reflux pumps is increased in a nonlinear and small way.
When the water inflow flow rate is monitored to exceed the treatment water amount of the normal operation of the variable-treatment-capacity biochemical treatment system through the water inflow flow meter, the control system controls the conversion of a denitrification zone, a nitrification zone and a sedimentation zone of the variable-treatment-capacity biochemical treatment system to increase the treatment capacity of the variable-treatment-capacity biochemical treatment system to 3-4 times of the average dry season treatment capacity through controlling a control valve and a start-stop stirring device on each aeration branch pipe of the aeration device;
when the water inflow flow rate is monitored to be more than 4-6 times of the average dry season flow rate through the water inflow flowmeter, the control system controls in the following way, and the control system comprises the following steps:
The bypass control valve is controlled to be opened to open the bypass pipe, the direct discharge control valve is opened to open the direct discharge drain pipe, the normal control valve is closed to close the normal drain pipe, the variable-treatment-capacity biochemical treatment system and the advanced treatment system in a serial state are converted into parallel operation, and the excess water quantity which cannot be treated by the variable-treatment-capacity biochemical treatment system directly enters the advanced treatment system through the bypass pipe to carry out primary strengthening treatment, and disinfectant is directly added after treatment or is discharged through an independent emergency discharge port after ultraviolet disinfection; or the treated effluent enters an independent disinfection area of the disinfection system to be disinfected and then is discharged;
or controlling to open the shunt control valve to open the shunt pipe so as to enable more than 4 times of water to directly enter the shunt regulation facility for temporary retention or direct overflow, and if temporary retention treatment is adopted, when the water inflow is not more than 2 times of average dry season flow, serially connecting the sewage stored by the shunt regulation facility back to the variable-throughput biochemical treatment system and the advanced treatment system for normal treatment;
when the inflow water flow meter monitors that the inflow water flow exceeds 6 times of the average dry season flow, the control system processes the water quantity exceeding 4-6 times of the average dry season flow in a control mode that: the bypass control valve is controlled to be opened to open the bypass pipe, the direct discharge control valve is controlled to be opened to open the direct discharge drain pipe, the normal control valve is closed to close the normal drain pipe, the variable-throughput biochemical treatment system and the advanced treatment system in a serial state are converted into parallel operation, and the excess water quantity which cannot be treated by the variable-throughput biochemical treatment system directly enters the advanced treatment system through the bypass pipe to be subjected to primary strengthening treatment, and is discharged through an independent emergency discharge port after being treated; the amount of water exceeding 6 times of the average dry season flow is treated in the following control manner: and controlling to open the shunt control valve to open the shunt pipe so that more than 6 times of water directly enters the shunt regulation facility to be temporarily retained or directly overflowed, and if temporary retention treatment is adopted, when the inflow water flow is recovered to be less than 2 times of the average dry season flow, serially connecting the sewage stored by the shunt regulation facility back to the variable-throughput biochemical treatment system and the advanced treatment system for normal treatment.
The specific steps of the operation control method are as follows:
step 1, adding a water inlet flowmeter behind a sand setting tank behind a lifting pump station of a pretreatment system for monitoring the water inlet amount; a biochemical flowmeter is arranged in front of the variable-throughput biochemical treatment system and is used for monitoring the water quantity entering the variable-throughput biochemical treatment system;
step 2, arranging a plurality of internal reflux sludge pumps (2-3 pumps) in the variable-throughput biochemical treatment system, and ensuring the internal reflux quantity of the mixed liquid of 250-400% in dry season and 100-300% in rainseason; a plurality of sludge reflux pumps (3-4 sludge reflux pumps can be provided with a frequency conversion device) are arranged in a reflux sludge pump house, so that the sludge reflux ratio is 50-200% adjustable, the reflux quantity is increased in rainy season, but the reflux ratio needs to be reduced to a proper proportion;
step 3, a bypass pipe and a bypass valve are arranged between the pretreatment system and the variable-throughput biochemical treatment system comprising a secondary sedimentation tank and the advanced treatment system, so that the sewage passing through the pretreatment system can be completely treated by the variable-throughput biochemical treatment system through valve adjustment or part of sewage is bypassed and directly enters the advanced treatment system; meanwhile, the water outlet pipe of the secondary sedimentation tank can be directly discharged into a normal discharge port for discharge, or can be completely discharged into the normal discharge port for discharge after being subjected to advanced treatment in an advanced treatment system;
And 4, controlling a direct drainage overflow port or temporarily storing the treated water quantity (which is 6 times of the average flow in dry seasons) exceeding the parallel operation of the variable-throughput biochemical treatment system and the advanced treatment system through a valve, and pumping the treated water quantity to the variable-throughput biochemical treatment system for conventional treatment through a separately arranged regulation water pump after sunny days.
In conclusion, the embodiment of the invention can be used for splitting the urban sewage plant
In order to clearly show the technical scheme and the technical effects provided by the invention, the split municipal sewage plant and the operation control method thereof provided by the embodiment of the invention are described in detail in the following by specific embodiments.
Examples
As shown in fig. 2, the embodiment of the invention provides a diversion municipal sewage plant, which can solve the actual situation and rainfall characteristics of a diversion drainage pipe network and a diversion sewage treatment plant in a southern city in China, adopts diversion as a main part, and can treat various sewage discharged into the diversion drainage pipe network as much as possible in dry season, and can treat various sewage flowing into the diversion sewage pipe network to the greatest extent under the rainfall season, namely, can improve the hydraulic load capacity of the sewage plant to the greatest extent under the condition of controlling the total organic matter pollution load, and can improve the value of the total peak value coefficient, and the rainy season treatment capacity of a submerged biochemical tank (anoxic tank and aerobic tank) and a secondary sedimentation tank, namely: the method effectively utilizes the redundant sedimentation capacity of a secondary sedimentation tank of a south urban sewage plant in summer, utilizes the abundant tank capacity of a part of a biochemical tank in summer as a sedimentation part, and directly introduces redundant inflow water (the flow which is higher than the flow which is 3-4 times of the designed average flow) into a deep treatment process section for treatment under the condition that the inflow water flow exceeds the upper limit of a variable treatment capacity type biochemical treatment system of the sewage plant, or/and temporarily stores the redundant water quantity and the like in a method of constructing a diversion regulation facility in a diversion sewage pipe network and the like, and performs measures such as treatment on the inflow water into the sewage plant after the rainfall is finished, so as to treat pollution load to the greatest extent. For example, the design of the original sewage plant according to the split-flow system drainage system is 100,000m 3 The treatment capacity/d can be improved by increasing the total peak value coefficient of the sewage plant, and the variable treatment capacity type biochemical treatment system of the sewage plant can be modified without increasing large investment, so that the maximum peak water quantity in winter is 6,250m 3 Per hour (domestic sewage, industrial sewage, etc.), the highest peak water quantity in summer is 12500-16660 m 3 And/h (the excess water is mainly the sewage volume which increases as a result of the inflow infiltration).
The embodiment is to 10000m 3 The pretreatment system, the variable-throughput biochemical treatment system and the advanced treatment system of the diversion municipal sewage plant of the invention are designed in the process of (116L/s) and above.
According to the variable throughput type biochemical treatment system of a sewage plant used in a southern city, which is operated under the conditions of winter (water temperature of 12-14 degrees celsius) and summer (water temperature of 26-28 degrees celsius), the volumes of the respective parts of the variable throughput type biochemical treatment system can be obtained assuming that the biochemical pool volumes of different seasons are as follows (since anaerobic zones are not involved, neglected here; in practical settings, anaerobic zones may be placed in front of the following facilities according to a general setting):
(1) The total tank capacity needed by the biochemical tank in winter is 40000m 3 The capacity of the nitrifying pond is 22000m 3 The capacity of the denitrification tank is 18000m 3 。
(2) The total tank capacity needed by the biochemical tank in summer is 28000m 3 The pool capacity of the nitration zone is 20000m 3 The tank capacity of the denitrification zone is 8000m 3 。
(3) Compared with the pool capacity of the nitrification area in winter and summer, the pool capacity of the nitrification area needed in winter is about 1.1 times of that in summer, and the change is not great.
(4) And compared with the pool capacity of the denitrification area in winter and summer, the pool capacity of the denitrification area needed in winter is 2.25 times of that in summer.
(5) The SVI value of the sludge in winter is higher, the sludge is reduced in summer, and the precipitation performance of the sludge in winter in a secondary sedimentation tank is poor; meanwhile, the surface load capacity of the secondary sedimentation tank is reduced along with the increase of the sludge concentration of the biochemical tank, the sludge concentration of the biochemical tank in winter is generally 3-5 g/l, and the sludge concentration of the biochemical tank in summer is generally 2.5-4 g/l. The peak flow 6250m in dry season in winter can be obtained by the comparison 3 The secondary sedimentation tank per hour has larger surface area and needs 10000m 2 The method comprises the steps of carrying out a first treatment on the surface of the Flow rate in summer and rainy season is 12,500m 3 The same secondary sedimentation tank area is required for the secondary sedimentation tank surface area per hour.
The peak flow of the urban sewage plant which enters the diversion system in the rainy season in the south (summer) is considered to be 2.5-6 times of the average flow of the arid season (except for extreme heavy rain), the average flow of the arid season is considered to be 1.5-2.5, and the coefficient of the peak flow of the rainy season and the peak flow of the arid season is considered to be 1.5-4 times. If the maximum total peak value coefficient of the diversion city sewage plant is 5-6, the maximum total peak value hour flow processed by the variable-throughput biochemical treatment system is 2.5-4 times of the average dry season flow, and the excessive flow is switched into the first-stage strengthening process treatment by the advanced treatment process in the sewage plant in the rainy season and/or is processed by the diversion regulation facility or temporarily stays for more than 4 times of the water quantity of the hour flow, the collection of the sewage in the south city through the diversion drainage pipe network and the treatment of the diversion city sewage plant are controllable in most cases, so that the diversion overflow pollution is controlled to the maximum extent, and the maximization of economic benefit and environmental benefit is realized.
In summary, under the condition of considering the treatment of various added water quantities, the design of the south diversion municipal sewage plant adopts the general value of the total peak value coefficient to be more than 2.5, and the maximum value is 5-6 according to the actual conditions of the drainage pipe network and the diversion municipal sewage plant, and is 100,000m 3 The average design flow/d is exemplified:
(1) Pretreatment capability: average flow rate in dry season 100,000m 3 Winter peak flow 6,250m 3 25,000m of peak summer flow recommendation 3 /h (at least 18,750 m) 3 /h)。
(2) Lifting pump station: average flow rate in dry season 100,000m 3 The peak flow in summer is recommended to be 25,000m at the highest 3 /h。
(3) Assuming that the total pollution load (the change within 20% is considered as an error) is unchanged, the concentration of various pollutants in the rainy season can be correspondingly reduced along with the increase of the flow and the like, and the expansion variable treatment capacity type biochemical treatment system is generally not considered for the transformation of a sewage plant, but the peak treatment capacity of various equipment is required to be corrected and changed, and the system is changed into a small-flow, medium-flow and large-flow multimode operation system. Various reflux pump settings were set based on the reflux ratio in fig. 3, namely:
(a) Sludge reflux ratio: 200% of the average flow rate and 50% of the reflux ratio were used when the water amount was the maximum.
(b) Reflux ratio of mixed solution: the maximum average flow rate can be 400% (adjustable between 200% and 400%) and the maximum internal reflux ratio is 100%.
(c) And (3) a secondary sedimentation tank: the surface load of dry seasons is generally 0.5-1.5 m/h, and the sludge concentration is 3-5 g/l according to the peak flow 6250m3/h in winter; the SVI value in summer is reduced, the sludge concentration is 2.5-4 g/l, and 14,580m is adopted according to the peak flow in summer 3 In addition to the flow rate, the consideration of the sewage characteristics difference between winter and summer is adoptedWhen the diameter and the proper number of secondary sedimentation tanks.
(4) Deep treatment: in winter, the secondary sedimentation tank is discharged and then enters into advanced treatment for treatment; in summer, when the water quantity exceeds about 14,580m3/h, the effluent of the secondary sedimentation tank is changed into the effluent of the secondary sedimentation tank to be directly discharged, the redundant water inflow is subjected to primary strengthening treatment through the deep treatment and is discharged through a single emergency discharge port or is temporarily stored through a regulating device, and after sunny days, the water is discharged into a pretreatment system, a variable-treatment-capacity biochemical treatment system and the deep treatment through a pump and is subjected to normal treatment, and is discharged through the normal discharge port.
(5) All pipelines and related water delivery and distribution facilities in the sewage plant adopt at least 2.5 times and at most 6 times of the average flow rate to carry out hydraulic load design.
According to the principle, for the above 100,000m 3 The flow and structure design of the split-flow municipal sewage plant of/d are as follows:
(1) Pretreatment capability: average flow rate in dry season 100,000m 3 And/d, the highest peak flow value is greater than 18750m 3 And/h, less than 25000m3/h.
(2) Lifting pump station: average flow rate in dry season 100,000m 3 And/d, the highest peak flow value is greater than 18750m 3 /h, less than 25000m 3 And/h. The pump selection needs to consider the operation matching of the minimum flow rate operation working condition and the maximum peak flow rate in dry season, and the standby pump can be started when the maximum peak flow rate is reached.
(3) The tank capacity of the variable-throughput biochemical treatment system is designed by adopting a traditional method, but the peak processing capacity of various devices is corrected, and the variable-throughput biochemical treatment system is changed into a multi-flow multi-mode operation system with dry seasons and rainy seasons:
(a) Sludge reflux ratio: the peak flow rate in dry season is 100-200%, the reflux ratio is 50% in maximum water amount, and the peak flow rate and the reflux ratio take large values, and the matching operation problem of the minimum flow rate and the maximum flow rate is considered.
(b) Reflux ratio of mixed solution: 400% is adopted when the peak flow rate is in dry season, 100% is adopted when the maximum water flow rate is in internal reflux ratio, the two take large values, and the matching operation problem of the minimum flow rate and the maximum flow rate is considered.
(c) It is contemplated that the nitrification zone may also serve as a denitrification zone, and the final portion of the nitrification zone may serve as a precipitation zone.
(d) The total aeration rate of the aeration device is the same as that of the traditional method, but the problem of operation flexibility and the operation of partial aeration closing are considered. In the case of the aeration equipment of a blower and an aeration head, at least 50% of aeration heads are arranged, and a manually-controlled or electrically-controlled control valve is arranged on an aeration branch pipe to control the start and stop of the aeration heads, so that a part of a biochemical pool is changed from a denitrification zone to a nitrification zone (aeration) and from the nitrification zone (aeration) to a precipitation zone. And is started when a stirring device is arranged in a denitrification area provided with an aeration head for denitrification.
(e) Adopts a multi-point water inlet mode with at least two points so as to realize the effect of strengthening the nitration reaction when large water flows.
(f) The surface load value of the secondary sedimentation tank is reduced, and the sedimentation capacity of the secondary sedimentation tank is increased by 50% on the basis of the traditional design.
(g) Two groups of parallel variable-treatment-capacity biochemical treatment systems can be arranged to be standby, four groups of secondary sedimentation tanks can be arranged to be standby, and any units in the variable-treatment-capacity biochemical treatment systems and the secondary sedimentation tanks can be operated in series.
(5) Depth processing system: considering the serial and parallel operation switchable mode of the variable-treatment-capacity biochemical treatment system at the front end, the variable-treatment-capacity biochemical treatment system and the advanced treatment system are operated in series when the water quantity is less than 2.5-3 times of the average dry season flow, and the variable-treatment-capacity biochemical treatment system and the advanced treatment system are operated in parallel when the water quantity is more than 3-4 times of the average dry season flow.
In summary, the flow-splitting urban sewage plant provided by the embodiment of the invention can provide corresponding treatment capacity for different flows, so that the treatment effect is improved, the flow-splitting overflow pollution is controlled to the maximum extent, and the maximization of economic benefit and environmental benefit is realized. By adopting the diversion system and simultaneously according to the water temperature and the biochemical reaction characteristics of the south city, the hydraulic load capacity of the municipal sewage plant is improved, and the overflow pollution of the diversion system drainage system can be effectively reduced. The diversion system drainage pipe network and the diversion system urban sewage plant are adopted in most southern areas (the annual rainfall is above 800mm and the average rainfall intensity is above 10 mm/d) of China, and diversion regulation facilities with corresponding volumes are arranged on the diversion system sewage pipeline according to actual conditions under the necessary conditions, so that the defects of the diversion system drainage system can be well made up, the investment of infrastructure of southern cities of China can be greatly reduced, sewage can be treated to the greatest extent, and the diversion system overflow pollution can be reduced.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background section herein is only for enhancement of understanding of the general background of the invention and is not to be taken as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.

Claims (6)

1. A split municipal sewage plant comprising:
the system comprises a pretreatment system, a variable throughput biochemical treatment system, an advanced treatment system, a disinfection system, a bypass pipe, a shunt regulation reservoir, a water inlet flowmeter, a biochemical water inlet flowmeter, a bypass control valve, a shunt control valve, a direct discharge control valve, a normal drain valve and a control system; wherein, the liquid crystal display device comprises a liquid crystal display device,
the pretreatment system is provided with a water inlet pipe and a water outlet pipe, and the water outlet pipe is connected with the variable-throughput biochemical treatment system;
the water outlet pipe of the pretreatment system is connected with the water inlet end of the advanced treatment system through the bypass pipe;
the pretreatment system is connected with the diversion regulation reservoir through the diversion pipe;
the pretreatment system is internally provided with the water inlet flowmeter;
the bypass control valve is arranged on the bypass pipe;
the shunt tube is provided with the shunt control valve;
the front end water inlet pipe of the variable-throughput biochemical treatment system is provided with the biochemical water inlet flowmeter:
the tail end of the variable-throughput biochemical treatment system is respectively provided with a straight drainage pipe and a normal drainage pipe connected with the water inlet end of the advanced treatment system, the straight drainage pipe is provided with the straight drainage control valve, the water outlet end of the straight drainage pipe is connected with the water inlet end of the disinfection system, and the normal drainage pipe is provided with the normal drainage valve;
The variable-throughput biochemical treatment system is provided with an internal reflux pump, a sludge reflux pump, stirring equipment and aeration equipment;
the variable-throughput biochemical treatment system consists of an A2/O variable-throughput biochemical treatment unit and a secondary sedimentation tank which are connected in sequence; wherein, the A2/O variable throughput type biochemical treatment unit comprises: the anaerobic tank and the biochemical tank are connected in sequence, and the biochemical tank is equally divided into a first anoxic zone, a second variable zone, a third aerobic zone and a fourth variable zone which are connected in sequence;
the four-zone variable zone is connected back to the front end of the anoxic zone of the first zone through an internal reflux pipeline provided with the internal reflux pump;
the aeration equipment is connected with aeration devices in the two-zone variable zone, the three-zone aerobic zone and the four-zone variable zone respectively through aeration branch pipes provided with control valves;
stirring equipment is arranged in the anoxic zone I and the variable zone II;
the secondary sedimentation tank is connected back to the water inlet end of the anaerobic tank through a sludge return pipeline provided with the sludge return pump;
the control system is electrically connected with the water inlet flowmeter, the biochemical water inlet flowmeter, the bypass control valve, the normal drain valve, the direct-discharge drain valve, the shunt control valve, the internal reflux pump, the stirring equipment and the aeration equipment respectively, and can correspondingly control the bypass control valve, the normal drain valve, the direct-discharge drain valve, the shunt control valve, the internal reflux pump, the sludge reflux pump, the stirring equipment and the aeration equipment according to the water inlet flow monitored by the water inlet flowmeter, so that the variable-throughput biochemical treatment system and the advanced treatment system operate in a serial mode for treating low flow, a parallel mode for treating medium flow and a shunt parallel and shunt regulation mode for treating high flow.
2. The split municipal sewage plant according to claim 1, wherein the pretreatment system comprises:
a coarse grid, a lifting pump room, a fine grid, a sand setting tank and a primary sedimentation tank which are connected in sequence; wherein, the liquid crystal display device comprises a liquid crystal display device,
the front end of the coarse grille is provided with the water inlet pipe, and the pipeline of which the rear end is connected with the lifting pump room is connected with the shunt pipe;
the rear end of the grit chamber is connected with the water inlet end of the advanced treatment system through the bypass pipe;
the rear end of the primary sedimentation tank is connected with the water outlet pipe;
the water inlet flowmeter is arranged on a pipeline between the sand setting tank and the primary sedimentation tank.
3. The split municipal sewage plant according to claim 1, wherein the secondary sedimentation tank volume is matched to sedimentation process parameters of the peak winter and peak summer flows of the sewage plant.
4. The split municipal sewage plant according to claim 1, wherein the number of sludge return pumps is 3-4;
the number of the internal reflux pumps is 2-3 which are arranged in parallel.
5. The split municipal sewage plant according to any of claims 1 to 4, wherein all pipes and associated water distribution facilities within the plant are designed with a hydraulic load of not less than 4 times the average flow.
6. An operation control method of a split municipal sewage plant, which is used for the sewage treatment control of the split municipal sewage plant according to any one of claims 1 to 5, comprising the steps of:
when the water inflow flow rate is not more than 2-3 times of the average dry season flow rate through the water inflow flowmeter, the control system controls the number of the internal reflux pumps and the sludge reflux pumps of the variable-treatment-capacity biochemical treatment system to correspond to the increase of the flow rate;
when the water inflow flow rate is monitored to exceed the treatment water amount of the normal operation of the variable-treatment-capacity biochemical treatment system through the water inflow flow meter, the control system controls the conversion of a denitrification zone, a nitrification zone and a sedimentation zone of the variable-treatment-capacity biochemical treatment system to increase the treatment capacity of the variable-treatment-capacity biochemical treatment system to 3-4 times of the average dry season treatment capacity through controlling a control valve and a start-stop stirring device on each aeration branch pipe of the aeration device;
when the water inflow flow rate is monitored to be more than 4 times of the average dry season flow rate through the water inflow flowmeter, the control system controls in the following way, and the control system comprises:
the bypass control valve is controlled to be opened to open the bypass pipe, the direct discharge control valve is opened to open the direct discharge drain pipe, the normal control valve is closed to close the normal drain pipe, the variable-treatment-capacity biochemical treatment system and the advanced treatment system in a serial state are converted into parallel operation, and the excess water quantity which cannot be treated by the variable-treatment-capacity biochemical treatment system directly enters the advanced treatment system through the bypass pipe to carry out primary strengthening treatment, and the effluent after the primary strengthening treatment is discharged after being disinfected by the disinfection system;
Or controlling to open the shunt control valve to open the shunt pipe so as to enable more than 4 times of water to directly enter the shunt regulation reservoir to be temporarily retained or directly overflow, and if temporary retention treatment is adopted, when the inflow water flow is less than 2 times of average dry season flow, serially connecting the sewage stored in the shunt regulation reservoir back to the variable-throughput biochemical treatment system, the advanced treatment system and the disinfection system for normal treatment;
when the inflow water flow meter monitors that the inflow water flow exceeds 6 times of the average dry season flow, the control system processes the water quantity exceeding 4-6 times of the average dry season flow in a control mode that: the bypass control valve is controlled to be opened to open the bypass pipe, the direct-discharge control valve is opened to open the direct-discharge drain pipe, the normal control valve is closed to close the normal drain pipe, the variable-treatment-capacity biochemical treatment system and the advanced treatment system in a serial state are converted into parallel operation, and the excess water quantity which cannot be treated by the variable-treatment-capacity biochemical treatment system directly enters the advanced treatment system through the bypass pipe to carry out primary strengthening treatment, and enters the disinfection system to carry out disinfection treatment and then is discharged; the amount of water exceeding 6 times of the average dry season flow is treated in the following control manner: and controlling to open the shunt control valve to open the shunt pipe so that more than 6 times of water directly enters the shunt regulating reservoir to be temporarily retained or directly overflowed, and if temporary retention treatment is adopted, when the inflow is recovered to less than 2 times of average dry season flow, serially connecting the sewage stored in the shunt regulating reservoir to the variable-throughput biochemical treatment system, the advanced treatment system and the disinfection system for normal treatment.
CN202210262420.1A 2022-03-17 2022-03-17 Flow-dividing urban sewage plant and operation control method thereof Active CN114560599B (en)

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