CN118286738A - Intelligent control method and system for mud discharge of primary sedimentation tank - Google Patents
Intelligent control method and system for mud discharge of primary sedimentation tank Download PDFInfo
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- Activated Sludge Processes (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a primary sedimentation tank sludge discharge intelligent control method and system, which comprises the following steps: and a data acquisition step: obtaining mud discharge control data of a primary sedimentation tank; and a data processing step: acquiring the effluent target SS concentration of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and acquiring the target running time of a sludge discharge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age; controlling the operation of the dredge pump: setting the target SS concentration of the effluent of the primary sedimentation tank and the target operation time of the sludge pump of the primary sedimentation tank as the operation conditions of the sludge pump, and controlling the operation of the sludge pump according to the operation conditions of the sludge pump.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a primary sedimentation tank sludge discharge intelligent control method and system.
Background
In the field of sewage treatment, primary sedimentation tanks are used as key sewage treatment facilities and are mainly responsible for removing suspended Solid Substances (SS) in wastewater. The traditional intelligent control method for the sludge discharge of the primary sedimentation tank is quite extensive, and the sludge discharge amount is usually controlled by manually switching on and off a sludge discharge pump or only by a time period. The method does not fully consider the water quality requirement of the subsequent biological treatment unit, so that a large amount of raw water carbon sources are discharged into the sludge storage tank along with the sludge, thereby not only wasting precious raw water carbon sources, but also increasing the medicine consumption and the sludge yield of the biological tank and increasing the operation cost of a sewage treatment plant.
In addition, the existing sewage treatment plant mainly depends on dosing of a medicament in the denitrification process, most of carbon sources in raw sewage are intercepted by a primary sedimentation tank and discharged to a mud storage tank, so that not only is the resource wasted, but also the economic burden of sewage treatment is increased. Therefore, how to improve the utilization rate of raw water carbon sources and reduce the adding amount of additional carbon sources, and simultaneously realize the refinement and intelligent control of the sludge discharge of the primary sedimentation tank becomes a technical problem to be solved urgently in the field of sewage treatment.
In the existing sewage treatment technology, a sludge discharge control system of a primary sedimentation tank mostly adopts a traditional sludge concentration meter or a sludge level meter to regulate and control the sludge discharge amount. These devices are typically mounted on a sludge line to measure the concentration or location of the sludge and thereby control the operation of the sludge discharge pump. However, this control approach has significant limitations and disadvantages. The sludge concentration meter and the sludge level meter are easily affected by the property change of the sludge in the measuring process, so that the error of measured data is larger, and the actual sludge concentration or position cannot be accurately reflected. Meanwhile, due to the lack of accurate control logic, the existing control system is easy to generate an overshoot phenomenon when the sludge discharge amount is adjusted, namely, the change of the sludge discharge amount exceeds a required range, which not only affects the sewage treatment efficiency, but also can cause the waste of resources. Furthermore, the prior art fails to fully consider the effects of Volatile Fatty Acids (VFA), chemical Oxygen Demand (COD), and sludge age generated during hydrolytic acidification in primary tanks on the efficiency of biological tank treatment.
Therefore, there is a need to develop a primary sedimentation tank sludge discharge intelligent control method and system which overcomes the above-mentioned drawbacks.
Disclosure of Invention
The invention provides a primary sedimentation tank sludge discharge intelligent control method and system, which optimize a sludge discharge strategy of a primary sedimentation tank by establishing a linear relation between suspended Solid Substances (SS) and Chemical Oxygen Demand (COD) and Total Nitrogen (TN), realize dynamic adjustment of the concentration of effluent SS of the primary sedimentation tank, improve the denitrification rate of a biological tank, reduce the dosage of a medicament, and further improve the sewage treatment efficiency and economic benefit.
In order to achieve the above purpose, the application provides an intelligent control method for sludge discharge of a primary sedimentation tank, which comprises the following steps:
And a data acquisition step: obtaining mud discharge control data of a primary sedimentation tank;
And a data processing step: acquiring the effluent target SS concentration of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and acquiring the target running time of a sludge pump of the primary sedimentation tank based on the total daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age;
Controlling the operation of the dredge pump: setting the target SS concentration of the primary sedimentation tank effluent and the target running time of the primary sedimentation tank dredge pump as dredge pump running conditions, and controlling the dredge pump to run according to the dredge pump running conditions.
Further, the mud discharging control data includes: the inlet water SS concentration of the primary sedimentation tank, the outlet water TN concentration of the primary sedimentation tank and the inlet water flow of the primary sedimentation tank;
the data processing step comprises the following steps:
the method comprises the steps of obtaining the SS concentration of effluent targets of a primary sedimentation tank: based on the SS concentration of the inflow water of the primary sedimentation tank, the SS concentration of the outflow water of the primary sedimentation tank and the TN concentration of the outflow water of the primary sedimentation tank, establishing an SS-TN linear relation equation to obtain the target SS concentration of the outflow water of the primary sedimentation tank;
The target running time of the primary sedimentation tank dredge pump is obtained: acquiring daily sludge discharge amount of the primary sedimentation tank based on the water inflow amount of the primary sedimentation tank, and acquiring optimal sludge age through a sludge age test; and calculating the target running time of the sludge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age.
Further, the primary sedimentation tank effluent target SS concentration obtaining step includes:
The sewage from the primary sedimentation tank with different SS concentrations and the equal amount of return sludge are subjected to denitrification rate test to obtain the SS concentration of the inlet water of the primary sedimentation tank with the fastest denitrification rate, and the optimal carbon nitrogen ratio can be obtained under the assumption that the proportion of biodegradable organic matters in the inlet water SS of the primary sedimentation tank is constant:
Wherein, For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,Is a constant;
Based on experimental data, the relation between the SS concentration of the effluent of the primary sedimentation tank and the COD concentration of the effluent of the primary sedimentation tank is linear, and the relation is as follows:
Wherein, For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,、Are all constant.
Further, the primary sedimentation tank effluent target SS concentration obtaining step further includes:
Based on the optimal carbon nitrogen ratio and the linear relation between the SS concentration of the effluent of the primary sedimentation tank and the COD concentration of the effluent of the primary sedimentation tank, the target SS concentration of the effluent of the primary sedimentation tank can be obtained as follows:
Wherein, The SS concentration is the target SS concentration of the effluent of the primary sedimentation tank.
Further, the primary sedimentation tank dredge pump target operation time obtaining step comprises the following steps:
Calculating the daily mud discharge amount of the primary sedimentation tank based on the water inflow amount of the primary sedimentation tank:
Wherein, The mud is discharged every day for the primary sedimentation tank; the inflow water flow of the primary sedimentation tank; The SS concentration is the daily water inlet of the primary sedimentation tank; the sedimentation efficiency of the primary sedimentation tank is improved; the water content of the sludge is the water content; The sludge density of the primary sedimentation tank is 1000 kg/m in a second meter;
obtaining the optimal sludge age through a sludge age test, wherein the daily target sludge discharge total amount of the primary sedimentation tank is as follows:
Wherein, The daily target total sludge discharge amount of the primary sedimentation tank; the total daily mud discharge amount of the primary sedimentation tank; Is the best sludge age;
Calculating the target running time of the sludge pump based on the daily target total sludge discharge amount of the primary sedimentation tank, wherein the target running time is as follows:
Wherein, The target running time of the dredge pump is set; The daily target total sludge discharge amount of the primary sedimentation tank; is the rated flow of the dredge pump.
Further, the step of controlling the operation of the dredge pump specifically comprises the following steps:
Determining floating equivalent of the primary sedimentation tank effluent target SS concentration, obtaining a primary sedimentation tank effluent target SS concentration upper limit value and a primary sedimentation tank effluent target SS concentration lower limit value based on the floating equivalent, setting the sludge pump target operation time as the sludge pump set operation time, monitoring the primary sedimentation tank effluent SS concentration and the sludge pump operated time in real time, and comparing and judging with a set value to control the sludge pump operation state.
Further, the step of controlling the operation of the dredge pump further comprises:
If the real-time SS concentration of the primary sedimentation tank effluent exceeds the upper limit value of the target SS concentration of the primary sedimentation tank effluent and the running time of the sludge pump is lower than the set running time of the sludge pump, controlling the sludge pump to start, and controlling the sludge pump to stop running until the real-time SS concentration of the primary sedimentation tank effluent is lower than the lower limit value of the target SS concentration of the primary sedimentation tank effluent;
If the real-time SS concentration of the primary sedimentation tank effluent is lower than the upper limit value of the target SS concentration of the primary sedimentation tank effluent and the running time of the sludge pump is lower than the set running time of the sludge pump, controlling the sludge pump to start until the real-time SS concentration of the primary sedimentation tank effluent is lower than the lower limit value of the target SS concentration of the primary sedimentation tank effluent, and controlling the sludge pump to stop running;
After the sludge pump is started, if the real-time SS concentration of the primary sedimentation tank effluent does not reach the lower limit value of the target SS concentration of the primary sedimentation tank effluent, and the running time of the sludge pump exceeds the set running time of the sludge pump, controlling the sludge pump to stop running;
If the real-time SS concentration of the primary sedimentation tank effluent exceeds the upper limit value of the target SS concentration of the primary sedimentation tank effluent and the running time of the sludge pump exceeds the set running time of the sludge pump, the sludge pump is not started;
If the real-time SS concentration of the effluent of the primary sedimentation tank is lower than the upper limit value of the target SS concentration of the effluent of the primary sedimentation tank, and the running time of the sludge pump exceeds the set running time of the sludge pump, the sludge pump is not started.
Further, the invention provides an intelligent control system for sludge discharge of a primary sedimentation tank, which comprises:
a data acquisition unit: the mud discharging control data are used for acquiring mud discharging control data of the primary sedimentation tank;
A data processing unit: acquiring the effluent target SS concentration of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and acquiring the target running time of a sludge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age;
And a control unit: and the system is used for setting the target SS concentration of the primary sedimentation tank effluent and the target running time of the primary sedimentation tank dredge pump as dredge pump running conditions, and controlling the dredge pump to run according to the dredge pump running conditions.
Further, the data acquisition unit specifically includes:
the primary sedimentation tank water inlet data acquisition module includes: the primary sedimentation tank inflow SS online analyzer and flowmeter;
The primary sedimentation tank water outlet data acquisition module comprises: an on-line analyzer for effluent SS of a primary sedimentation tank and an on-line analyzer for effluent TN of the primary sedimentation tank.
Further, the control unit is electrically connected to the data acquisition unit, the data processing unit and the sludge pump, and is used for controlling the running state of the sludge pump.
Compared with the prior art, the invention has the advantages and positive effects that: according to the invention, the linear relation between suspended solid SS and chemical oxygen demand COD and total nitrogen TN is established, so that the sludge discharge strategy of the primary sedimentation tank is optimized, the dynamic adjustment of the concentration of the effluent SS of the primary sedimentation tank is realized, the utilization rate of raw water carbon sources is improved, the addition amount of the additional carbon sources is reduced, the denitrification rate of the biological tank is improved, and the addition amount of the medicament is reduced, thereby improving the sewage treatment efficiency and economic benefit. Meanwhile, the invention obtains the target running time of the sludge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age, and controls the sludge pump by combining the linear relation, so as to accurately control the running time of the sludge pump, improve the effluent VFA and SCOD of the primary sedimentation tank, simultaneously realize continuous sludge discharge of the sludge pump, and avoid the problem that the sludge pump runs or stops for a long time because the effluent SS concentration of the primary sedimentation tank does not reach a set value, and the sludge discharge amount cannot be controlled continuously.
Drawings
FIG. 1 is a schematic flow chart of an intelligent control method for sludge discharge in a primary sedimentation tank;
FIG. 2 is a control logic diagram of the intelligent control method for the sludge discharge of the primary sedimentation tank;
FIG. 3 is a schematic diagram of the intelligent control system for sludge discharge in the primary sedimentation tank.
In the above figures:
100. a data acquisition unit; 200. a data processing unit; 300. and a control unit.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the application. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; 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 above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Primary sedimentation tanks are a key component of sewage treatment systems, mainly for removing large-particle suspended solids such as silt, organic debris, fibers and some microbial aggregates from sewage. The design and operation of the primary sedimentation tank is important to improve the efficiency of the whole sewage treatment system and reduce the load of the subsequent treatment units. The design and operation of the primary sedimentation tank need to comprehensively consider the characteristics, treatment targets, economy and sustainability of sewage. The following parameters are of particular concern in primary sedimentation tank design and operation:
Suspended Solids (SS): refers to solid particles in sewage which cannot pass through the filter, and comprises organic matters and inorganic matters. The removal efficiency of SS is an important indicator for evaluating the performance of the primary sedimentation tank.
Total Nitrogen (TN): including all forms of nitrogen, including ammonia nitrogen, organic nitrogen, and nitrite nitrogen. The control of TN is very important for preventing eutrophication of water and optimizing biological treatment process.
Chemical Oxygen Demand (COD) refers to the amount of oxygen consumed by the oxidation of organic and partially oxidized inorganic materials in water by a strong oxidant under certain conditions.
The Soluble Chemical Oxygen Demand (SCOD) refers to the amount of oxygen consumed by soluble organic matter in water under the action of a strong oxidant (usually potassium permanganate or potassium dichromate under acidic conditions).
As shown in fig. 1-3, the present invention provides a method and a system for intelligently controlling sludge discharge from a primary sedimentation tank, which are used for realizing intelligent control of sludge discharge from the primary sedimentation tank, and the method and the system for intelligently controlling sludge discharge from the primary sedimentation tank are described in detail below with reference to fig. 1-3.
As shown in FIG. 1, the invention provides an intelligent control method for sludge discharge of a primary sedimentation tank, which comprises the following steps:
data acquisition step S100: the mud discharging control data of the primary sedimentation tank is obtained, and concretely comprises the following steps: the inlet water SS concentration of the primary sedimentation tank, the outlet water TN concentration of the primary sedimentation tank and the inlet water flow of the primary sedimentation tank. In some embodiments, the sludge discharge control data may be obtained by the primary sedimentation tank water inlet SS on-line analyzer, the flowmeter, the primary sedimentation tank water outlet SS on-line analyzer, and the primary sedimentation tank water outlet TN on-line analyzer, respectively, and uploaded to the control unit.
In some embodiments, in order to reduce noise and interference and improve the reliability of data, the mud discharge control data of the primary sedimentation tank is subjected to filtering noise reduction processing, such as moving average filtering, kalman filtering or low-pass filtering, and then uploaded to the control unit after the filtering noise reduction processing.
Data processing step S200: and obtaining the target SS concentration of the effluent of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and obtaining the target running time of the sludge discharge pump of the primary sedimentation tank based on the daily sludge discharge amount and the optimal sludge age of the primary sedimentation tank.
Specifically, the data processing step S200 includes:
the method comprises the steps of obtaining the SS concentration of effluent targets of a primary sedimentation tank: based on the SS concentration of the inflow water of the primary sedimentation tank, the SS concentration of the outflow water of the primary sedimentation tank and the TN concentration of the outflow water of the primary sedimentation tank, a SS-TN linear relation equation is established to obtain the target SS concentration of the outflow water of the primary sedimentation tank.
In some embodiments, the average SS concentration of the inflow water of the primary sedimentation tank in the month is obtained through the historical data of the sewage plant in the last year, and the minimum value and the maximum value are found, wherein the SS concentration change in the range reflects seasonal fluctuation and daily change of the inflow water quality of the sewage plant.
In some embodiments, the primary settling tank inlet water SS concentration is a minimum of 30mg/l and a maximum of 180mg/l. Based on this concentration range, primary sedimentation tank sewage of different SS concentrations is obtained, and in some embodiments, six representative SS concentration values of 30mg/l, 60mg/l, 90mg/l, 120mg/l, 150mg/l, 180mg/l are selected to simulate the treatment effect of the primary sedimentation tank under different water inflow conditions.
When the denitrification rate test is carried out, each part of primary sedimentation tank sewage with different SS concentrations and the same amount of reflux sludge are fully mixed in a measuring cylinder, so that the contact and the reaction between the two are ensured. These mixed samples were then subjected to simultaneous denitrification rate testing in the laboratory. During the test, the denitrification effect under different SS concentration conditions is evaluated by monitoring the change of nitrogen, such as the concentration change of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. By comparing the denitrification rates under different SS concentrations, a sample with the fastest denitrification rate can be determined, and the optimal influent SS concentration of the primary sedimentation tank with the fastest denitrification rate can be obtained.
Assuming that the proportion of biodegradable organic matters in the influent SS of the primary sedimentation tank is constant, an optimal carbon-nitrogen ratio can be obtained based on the optimal influent SS concentration of the primary sedimentation tank:
Wherein, For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,Is a constant. Further, by periodic collection and analysis of the primary sedimentation tank in and out water samples, measured values of COD and SS can be obtained. Then, based on the sampling data, a linear relationship between the COD concentration of the effluent of the primary sedimentation tank and the SS concentration of the effluent of the primary sedimentation tank can be determined by using a statistical method. The linear relation between the SS concentration of the effluent of the primary sedimentation tank and the COD concentration of the effluent of the primary sedimentation tank is assumed as follows:
Wherein, And b and c are constants for the SS concentration of the effluent of the primary sedimentation tank.
Further, based on the above-mentioned linear relation between the optimal carbon nitrogen ratio and the SS concentration of the effluent from the primary sedimentation tank and the COD concentration of the effluent from the primary sedimentation tank, the target SS concentration of the effluent from the primary sedimentation tank can be obtained as follows:
Wherein, The SS concentration is the target SS concentration of the effluent of the primary sedimentation tank.
The specific values of b and c can be calculated by sampling and analyzing the primary sedimentation tank effluent SS and TN a plurality of times in a laboratory and substituting the obtained data into the linear equation.
Specifically, the data processing step S200 further includes: the target running time of the primary sedimentation tank dredge pump is obtained: acquiring daily sludge discharge amount of the primary sedimentation tank based on water inflow of the primary sedimentation tank, and acquiring optimal sludge age through a sludge age test; and calculating the target running time of the sludge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age.
In some embodiments, the primary sedimentation tank daily mud discharge is first measured based on the primary sedimentation tank influent flow rate:
Wherein W is the daily mud discharge amount of the primary sedimentation tank, and the unit is m/d; q is the inflow water flow of the primary sedimentation tank, and the unit is m w/d; The daily average inflow SS concentration of the primary sedimentation tank is given in g/L; the sedimentation efficiency of the primary sedimentation tank is improved; the water content of the sludge is the water content; for the primary sedimentation tank sludge density, 1000 kg/m of the sludge is counted.
Sludge age refers to the average residence time of sludge in the system, and may refer to the average residence time of microorganisms in activated sludge in the system, typically in days d. In some embodiments, the optimal sludge age is obtained by a sludge age test, in particular, in order to ensure the accuracy of the sludge age test, the quality and quantity of the primary sedimentation tank inflow water are kept relatively stable during the test, and the sewage samples of different sludge ages are sampled, for example, the sludge ages of the sewage samples are respectively set to 1 day, 2 days, 3 days, 4 days, 5 days, 6 days and 7 days. The concentration of SCOD or COD of the effluent of the primary sedimentation tank under the condition of each sludge age is recorded, and the sludge age of the test sample with the highest concentration is the optimal sludge age by comparing the concentration of SCOD or COD under different sludge ages.
Obtaining the optimal sludge age through a sludge age test, wherein the daily target sludge discharge amount of the primary sedimentation tank is as follows:
Wherein, The unit is m is the total daily target sludge discharge amount of the primary sedimentation tank; The total daily mud discharge amount of the primary sedimentation tank is m in the unit; For the best sludge age, here Is regarded as a dimensionless proportionality constant for adjusting the total daily mud discharge amount of the primary sedimentation tankTo obtain the daily target total sludge discharge amount of the primary sedimentation tank。
Calculating the target running time of the sludge pump based on the daily target total sludge discharge amount of the primary sedimentation tank, wherein the target running time is as follows:
wherein T is the target running time of the sludge pump of the primary sedimentation tank, namely the target running time of the sludge pump per hour, and the unit is min; the unit is m is the total daily target sludge discharge amount of the primary sedimentation tank; The unit is m W/h for rated flow of the sludge pump.
And controlling the sludge pump to operate in the step S300: setting the target SS concentration of the effluent of the primary sedimentation tank and the target operation time of the sludge pump of the primary sedimentation tank as the operation conditions of the sludge pump, and controlling the operation of the sludge pump according to the operation conditions of the sludge pump.
As shown in fig. 2, in some embodiments, the controlling the sludge pump operation step S300 specifically includes:
In the operation management of the primary sedimentation tank, the SS concentration of the primary sedimentation tank is difficult to always maintain at a fixed target value due to the fluctuation of the water quality and the water quantity of the inlet water and the dynamic change in the system. To cope with such fluctuations, a buffer zone, i.e., a floating equivalent, may be provided to avoid frequent start-up and shut-down of the sludge pump due to small changes in SS concentration, resulting in excessive wear of equipment or overshoot of the control system.
Determining floating equivalent of the primary sedimentation tank effluent target SS concentration, obtaining a primary sedimentation tank effluent target SS concentration upper limit value and a primary sedimentation tank effluent target SS concentration lower limit value based on the floating equivalent, setting the sludge pump target operation time as the sludge pump operation upper limit time, monitoring the primary sedimentation tank effluent SS concentration and the sludge pump operation time in real time, and comparing and judging with the set values to control the sludge pump operation state.
Specifically, the controlling the sludge pump operation step S300 further includes:
If the real-time SS concentration of the effluent of the primary sedimentation tank exceeds the upper limit value of the target SS concentration of the effluent of the primary sedimentation tank, and the running time of the sludge pump is lower than the set running time of the sludge pump, controlling the sludge pump to start, and controlling the sludge pump to stop running until the real-time SS concentration of the effluent of the primary sedimentation tank is lower than the lower limit value of the target SS concentration of the effluent of the primary sedimentation tank; after the sludge pump is started, if the real-time SS concentration of the primary sedimentation tank effluent does not reach the lower limit value of the target SS concentration of the primary sedimentation tank effluent, and the running time of the sludge pump exceeds the set running time of the sludge pump, controlling the sludge pump to stop running;
if the real-time SS concentration of the effluent of the primary sedimentation tank is lower than the upper limit value of the target SS concentration of the effluent of the primary sedimentation tank and the running time of the sludge pump is lower than the set running time of the sludge pump, controlling the sludge pump to start until the real-time SS concentration of the effluent of the primary sedimentation tank is lower than the lower limit value of the target SS concentration of the effluent of the primary sedimentation tank, and controlling the sludge pump to stop running; after the sludge pump is started, if the real-time SS concentration of the primary sedimentation tank effluent does not reach the lower limit value of the target SS concentration of the primary sedimentation tank effluent, and the running time of the sludge pump exceeds the set running time of the sludge pump, controlling the sludge pump to stop running;
if the real-time SS concentration of the effluent of the primary sedimentation tank exceeds the upper limit value of the target SS concentration of the effluent of the primary sedimentation tank and the running time of the sludge pump exceeds the set running time of the sludge pump, the sludge pump is not started;
if the real-time SS concentration of the effluent of the primary sedimentation tank is lower than the upper limit value of the target SS concentration of the effluent of the primary sedimentation tank, and the running time of the sludge pump exceeds the set running time of the sludge pump, the sludge pump is not started.
Through real-time supervision primary sedimentation tank goes out the SS concentration of water to compare with preset target concentration scope, the control unit can accurate control dredge pump start-up and stop, in order to keep the SS concentration of primary sedimentation tank play water in the optimal range, can realize the dynamic adjustment to primary sedimentation tank play water SS concentration, improve biological pond denitrification rate, and reduce the medicament dosage, thereby promote sewage treatment efficiency and economic benefits, simultaneously through setting up dredge pump's operation upper limit time, can avoid leading to dredge pump frequent start-stop because of the fluctuation of a small margin of SS concentration, thereby reduce mechanical wear and energy consumption, help maintaining activated sludge system's stability, reduce the production of excessive mud, thereby reduce sludge treatment and handling's cost.
As shown in fig. 3, the present invention provides an intelligent control system for sludge discharge of a primary sedimentation tank, comprising:
Data acquisition unit 100: the mud discharging control data are used for acquiring mud discharging control data of the primary sedimentation tank;
Data processing unit 200: acquiring the effluent target SS concentration of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and acquiring the target running time of a sludge discharge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age;
the control unit 300: the method is used for setting the target SS concentration of the effluent of the primary sedimentation tank and the target operation time of the sludge pump of the primary sedimentation tank as the operation condition of the sludge pump, and controlling the operation of the sludge pump according to the operation condition of the sludge pump.
Specifically, the data acquisition unit 100 includes:
the primary sedimentation tank water inlet data acquisition module includes: the primary sedimentation tank inflow SS online analyzer and flowmeter;
The primary sedimentation tank water outlet data acquisition module comprises: an on-line analyzer for effluent SS of a primary sedimentation tank and an on-line analyzer for effluent TN of the primary sedimentation tank.
Specifically, the control unit 300 is electrically connected to the data acquisition unit 100, the data processing unit 200, and the sludge pump, and is used for controlling the operation state of the sludge pump. In some embodiments, the control unit 300 employs a PLC system.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (15)
1. An intelligent control method for sludge discharge of a primary sedimentation tank is characterized by comprising the following steps:
And a data acquisition step: obtaining mud discharge control data of a primary sedimentation tank;
And a data processing step: acquiring the effluent target SS concentration of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and acquiring the target running time of a sludge pump of the primary sedimentation tank based on the total daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age;
Controlling the operation of the dredge pump: setting the target SS concentration of the primary sedimentation tank effluent and the target running time of the primary sedimentation tank dredge pump as dredge pump running conditions, and controlling the dredge pump to run according to the dredge pump running conditions.
2. The intelligent control method for sludge discharge in a primary sedimentation tank according to claim 1, wherein the sludge discharge control data comprises: the inlet water SS concentration of the primary sedimentation tank, the outlet water TN concentration of the primary sedimentation tank and the inlet water flow of the primary sedimentation tank;
the data processing step comprises the following steps:
the method comprises the steps of obtaining the SS concentration of effluent targets of a primary sedimentation tank: based on the SS concentration of the inflow water of the primary sedimentation tank, the SS concentration of the outflow water of the primary sedimentation tank and the TN concentration of the outflow water of the primary sedimentation tank, establishing an SS-TN linear relation equation to obtain the target SS concentration of the outflow water of the primary sedimentation tank;
The target running time of the primary sedimentation tank dredge pump is obtained: acquiring daily sludge discharge amount of the primary sedimentation tank based on the water inflow amount of the primary sedimentation tank, and acquiring optimal sludge age through a sludge age test; and calculating the target running time of the sludge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age.
3. The intelligent control method for sludge discharge in a primary sedimentation tank according to claim 2, wherein the primary sedimentation tank effluent target SS concentration obtaining step comprises:
The sewage from the primary sedimentation tank with different SS concentrations and the equal amount of return sludge are subjected to denitrification rate test to obtain the SS concentration of the inlet water of the primary sedimentation tank with the fastest denitrification rate, and the optimal carbon nitrogen ratio can be obtained under the assumption that the proportion of biodegradable organic matters in the inlet water SS of the primary sedimentation tank is constant:
Wherein, For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,Is a constant;
Based on experimental data, the relation between the SS concentration of the effluent of the primary sedimentation tank and the COD concentration of the effluent of the primary sedimentation tank is linear, and the relation is as follows:
4. Wherein, For yielding water from the primary sedimentation tankThe concentration of the water in the water is higher,、Are all constant.
5. The intelligent control method for sludge discharge in a primary sedimentation tank according to claim 3, wherein the primary sedimentation tank effluent target SS concentration obtaining step further comprises:
Based on the optimal carbon nitrogen ratio and the linear relation between the SS concentration of the effluent of the primary sedimentation tank and the COD concentration of the effluent of the primary sedimentation tank, the target SS concentration of the effluent of the primary sedimentation tank can be obtained as follows:
6. Wherein, The SS concentration is the target SS concentration of the effluent of the primary sedimentation tank.
7. The intelligent control method for primary sedimentation tank sludge discharge according to claim 4, wherein the primary sedimentation tank sludge discharge pump target operation time obtaining step comprises:
Calculating the daily mud discharge amount of the primary sedimentation tank based on the water inflow amount of the primary sedimentation tank:
8. Wherein, The mud is discharged every day for the primary sedimentation tank; the inflow water flow of the primary sedimentation tank; The SS concentration is the daily water inlet of the primary sedimentation tank; the sedimentation efficiency of the primary sedimentation tank is improved; the water content of the sludge is the water content; The sludge density of the primary sedimentation tank is 1000 kg/m in a second meter;
obtaining the optimal sludge age through a sludge age test, wherein the daily target sludge discharge total amount of the primary sedimentation tank is as follows:
9. wherein, The daily target total sludge discharge amount of the primary sedimentation tank; the total daily mud discharge amount of the primary sedimentation tank; Is the best sludge age;
Calculating the target running time of the sludge pump based on the daily target total sludge discharge amount of the primary sedimentation tank, wherein the target running time is as follows:
10. wherein, The target running time of the dredge pump is set; The daily target total sludge discharge amount of the primary sedimentation tank; is the rated flow of the dredge pump.
11. The intelligent control method for sludge discharge in a primary sedimentation tank according to claim 5, wherein the step of controlling the operation of the sludge discharge pump comprises the following steps:
Determining floating equivalent of the primary sedimentation tank effluent target SS concentration, obtaining a primary sedimentation tank effluent target SS concentration upper limit value and a primary sedimentation tank effluent target SS concentration lower limit value based on the floating equivalent, setting the sludge pump target operation time as the sludge pump set operation time, monitoring the primary sedimentation tank effluent SS concentration and the sludge pump operated time in real time, and comparing and judging with a set value to control the sludge pump operation state.
12. The intelligent control method for sludge discharge in a primary sedimentation tank according to claim 6, wherein the step of controlling the operation of the sludge discharge pump further comprises:
If the real-time SS concentration of the primary sedimentation tank effluent exceeds the upper limit value of the target SS concentration of the primary sedimentation tank effluent and the running time of the sludge pump is lower than the set running time of the sludge pump, controlling the sludge pump to start, and controlling the sludge pump to stop running until the real-time SS concentration of the primary sedimentation tank effluent is lower than the lower limit value of the target SS concentration of the primary sedimentation tank effluent;
If the real-time SS concentration of the primary sedimentation tank effluent is lower than the upper limit value of the target SS concentration of the primary sedimentation tank effluent and the running time of the sludge pump is lower than the set running time of the sludge pump, controlling the sludge pump to start until the real-time SS concentration of the primary sedimentation tank effluent is lower than the lower limit value of the target SS concentration of the primary sedimentation tank effluent, and controlling the sludge pump to stop running;
After the sludge pump is started, if the real-time SS concentration of the primary sedimentation tank effluent does not reach the lower limit value of the target SS concentration of the primary sedimentation tank effluent, and the running time of the sludge pump exceeds the set running time of the sludge pump, controlling the sludge pump to stop running;
If the real-time SS concentration of the primary sedimentation tank effluent exceeds the upper limit value of the target SS concentration of the primary sedimentation tank effluent and the running time of the sludge pump exceeds the set running time of the sludge pump, the sludge pump is not started;
If the real-time SS concentration of the effluent of the primary sedimentation tank is lower than the upper limit value of the target SS concentration of the effluent of the primary sedimentation tank, and the running time of the sludge pump exceeds the set running time of the sludge pump, the sludge pump is not started.
13. An intelligent control system for sludge discharge of a primary sedimentation tank, which is characterized by comprising:
a data acquisition unit: the mud discharging control data are used for acquiring mud discharging control data of the primary sedimentation tank;
A data processing unit: acquiring the effluent target SS concentration of the primary sedimentation tank through an SS-TN linear relation equation based on the sludge discharge control data, and acquiring the target running time of a sludge pump of the primary sedimentation tank based on the daily sludge discharge amount of the primary sedimentation tank and the optimal sludge age;
And a control unit: and the system is used for setting the target SS concentration of the primary sedimentation tank effluent and the target running time of the primary sedimentation tank dredge pump as dredge pump running conditions, and controlling the dredge pump to run according to the dredge pump running conditions.
14. The primary sedimentation tank sludge discharge intelligent control system of claim 8, wherein the data acquisition unit specifically comprises:
the primary sedimentation tank water inlet data acquisition module includes: the primary sedimentation tank inflow SS online analyzer and flowmeter;
The primary sedimentation tank water outlet data acquisition module comprises: an on-line analyzer for effluent SS of a primary sedimentation tank and an on-line analyzer for effluent TN of the primary sedimentation tank.
15. The intelligent control system for sludge discharge in a primary sedimentation tank according to claim 9, wherein the control unit is electrically connected to the data acquisition unit, the data processing unit and the sludge discharge pump, and is used for controlling the operation state of the sludge discharge pump.
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