CN113307342A - Intelligent adding system for chemical phosphorus removal agent of high-density tank - Google Patents

Intelligent adding system for chemical phosphorus removal agent of high-density tank Download PDF

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CN113307342A
CN113307342A CN202110633383.6A CN202110633383A CN113307342A CN 113307342 A CN113307342 A CN 113307342A CN 202110633383 A CN202110633383 A CN 202110633383A CN 113307342 A CN113307342 A CN 113307342A
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phosphorus
equal
less
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effluent
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CN113307342B (en
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鲜吉成
孙宝江
陈永红
张强
冯东
吴鹏宇
余升
黄晶
刘洁
黄恋涵
蒋辉琴
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Chongqing Zhongfa Environmental Protection R&d Center Co ltd
Chongqing Drainage Co Ltd
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Chongqing Zhongfa Environmental Protection R&d Center Co ltd
Chongqing Drainage 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209—Regulation methods for flocculation or precipitation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • 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
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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Abstract

The invention discloses an intelligent adding system of a high-density tank chemical phosphorus removal agent, wherein the adding amount of the theoretical chemical phosphorus removal agent of the system is determined by the following formula:
Figure DDA0003104603500000011
the actual addition amount is calculated by formula

Description

Intelligent adding system for chemical phosphorus removal agent of high-density tank
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an intelligent dosing system for a chemical phosphorus removal agent in a high-density tank.
Background
The phosphorus in the sewage mainly comes from phosphorus-containing organic matters, synthetic detergents, industrial waste liquid, chemical fertilizers and pesticides and various animal excretions in the domestic sewage. If the sewage is not completely treated, phosphorus can be lost to rivers, lakes and seas, so that water eutrophication is caused, and further a serious water environment problem is caused.
At present, a high-density tank (fully called a high-density sedimentation tank and also called an efficient sedimentation tank) process is adopted for chemical phosphorus removal of many sewage plants, and a polyaluminium chloride (PAC) or polyferric chloride (PFS) is adopted as a phosphorus removal agent. According to preliminary statistics, the high-density pond used in the Chongqing water business market is up to 60. However, the high-density tank is mainly used for removing turbidity from the water treatment process at first, and the operation management is complex, especially the investment of the high-density tankThe chemical system is not only related to the water inlet flow and the water quality of inlet and outlet water, but also related to factors such as the reflux ratio of the high-density tank, the concentration of reflux sludge, the concentration of sludge in a reaction zone, the sludge discharge period and the like. At present, in the chemical phosphorus removal dosing process of most sewage plants in China, the control is relatively extensive, the operation strategy of 'sacrificing the operation cost to ensure the water outlet effect' is generally adopted mainly according to manual experience, the phosphorus removal agent is dosed in a constant amount and in an excessive amount, and the medicine consumption waste is relatively large. According to statistics, after upgrading and reconstruction of a sewage plant, the medicine consumption of a plurality of sewage plants in China exceeds the power consumption, and actual research shows that the data of the 2020 annual total water treatment amount, the total power consumption and the total medicine consumption (including poly-iron, poly-aluminum, PAM, a composite carbon source and a disinfectant) of a certain sewage plant are converted into the power consumption and the medicine consumption of each cubic meter of sewage, and the results are as follows: the power consumption for treating each ton of sewage in 2020 is 0.135 yuan/m3(the price of electricity is calculated according to 0.7 yuan/KW.h), the consumption of the medicine is 0.2 yuan/m3The drug consumption is 1.48 times of the power consumption, the drug consumption is far more than the power consumption, and in the cost composition of the drug consumption (including poly-iron, poly-aluminum, PAM, composite carbon source and disinfectant), the phosphorus removal agent accounts for more than 50%, which also shows that the dosage of the phosphorus removal agent accounts for the most part of the drug consumption. Therefore, how to achieve accurate dosing so as to achieve the purposes of ensuring that the effluent quality reaches the standard and reducing the drug consumption is the technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an intelligent feeding system for a high-density tank chemical phosphorus removal agent, which solves the problem that the prior art cannot accurately control the quality of inlet water and cannot timely and accurately control the feeding amount on the basis of fully mastering the important influence of the returned sludge of the high-density tank on the feeding amount of the phosphorus removal agent.
In order to solve the technical problems, the invention adopts the following technical scheme:
an intelligent dosing system for a chemical phosphorus removal agent in a high-density tank comprises a water inlet flow meter, a water inlet positive phosphorus detector, a water outlet positive phosphorus detector and a dosing pump; the water inlet flow meter measures the water quantity of the water inlet pipeline in real time and records the collected water inlet quantity; the water inlet positive phosphorus detector is used for measuring the water inlet positive phosphorus of the water inlet pipeline in real time and recording the collected water inlet positive phosphorus value; the effluent positive phosphorus detector measures the effluent positive phosphorus of the water outlet pipeline in real time and records the collected effluent positive phosphorus value; the dosing pump is used for dosing according to the actual dosing amount of the chemical phosphorus removal agent;
the theoretical chemical phosphorus removal agent dosage of the intelligent high-density tank chemical phosphorus removal agent dosing system is determined by the following formula:
Figure BDA0003104603480000021
in the formula:
Cmtheoretical dosage (mg/L) of the phosphorus removal agent;
Cp0-inlet water phosphorus concentration (mg/L);
Cp-setting a target control value (mg/L) of the concentration of the positive phosphorus in the effluent;
a1、a2-dimensionless empirical constants;
a3-having a dimensional empirical constant (L/mg);
the dosage of the actual chemical phosphorus removal agent is determined by the following formula:
Figure BDA0003104603480000022
in the formula: v, adding the medicine amount per hour (L/h) by a medicine adding pump; k is a radical of1-high density pond sludge influence correction factor; q-high density pool water inlet flow (m)3H); rho is the density (kg/L) of the phosphorus removing agent; cmTheoretical dosage (mg/L) of phosphorus removal agent.
Preferably, the phosphorus removal agent is selected from one of liquid polyaluminum chloride (PAC) or liquid Polymeric Ferric Sulfate (PFS).
Preferably, the high density pond inlet water is led to have a positive phosphorus concentration value Cp0Is divided into the following 10 intervals, Cp0≤0.50；0.50<Cp0≤0.60；0.60<Cp0≤0.70；0.70<Cp0≤0.80；0.80<Cp0≤0.90；0.90<Cp0≤1.00；1.00<Cp0≤1.10；1.10<Cp0≤1.20；1.20<Cp0≤1.30；1.30<Cp0Less than or equal to 1.40 (mg/L); when the positive phosphorus value of the inlet water falls in any interval, C in the theoretical chemical phosphorus removal agent dosage calculation formulap0The maximum value of the interval in which this value lies is taken.
Preferably, the phosphorus removal agent is liquid aluminum Polychloride (PAC); when C is presentp0When the content is less than or equal to 0.50, a1＝1.26043，a2＝0.01723，a3-0.28809; when 0.50<Cp0When the content is less than or equal to 0.60, a1＝1.41013、a2＝0.01227、a3-0.42059; when 0.60<Cp0When the content is less than or equal to 0.70, a1＝1.38896、a2＝0.0128、a3-0.35934; when 0.70<Cp0When the content is less than or equal to 0.80, a1＝1.42135、a2＝0.01057、a3-0.40713; when 0.80<Cp0When the content is less than or equal to 0.90, a1＝1.30182、a2＝0.01169、a3-0.29793; when 0.90<Cp0When the content is less than or equal to 1.00, a1＝1.37882、a2＝0.00965、a3-0.36868; when 1.00<Cp0When the content is less than or equal to 1.10, a1＝1.36388、a2＝0.0091、a3-0.35271; when 1.10<Cp0When the content is less than or equal to 1.20, a1＝1.33737、a2＝0.00969、a3-0.3297; when 1.20 is<Cp0When the content is less than or equal to 1.30, a1＝1.30142、a2＝0.00939、a3-0.29497; when 1.30<Cp0When the content is less than or equal to 1.40, a1＝1.26282、a2＝0.00988、a3＝-0.261095。
Preferably, the phosphorus removal agent is liquid Polymeric Ferric Sulfate (PFS); when C is presentp0When the content is less than or equal to 0.50, a1＝1.3794、a2＝0.04615、a3-0.34017; when 0.50<Cp0When the content is less than or equal to 0.60, a1＝1.43995、a2＝0.03947、a3-0.39535; when 0.60<Cp0When the content is less than or equal to 0.70, a1＝1.33187、a2＝0.04161、a3-0.29017; when 0.70<Cp0When the content is less than or equal to 0.80,a1＝1.35559、a2＝0.03773、a3-0.31232; when 0.80<Cp0When the content is less than or equal to 0.90, a1＝1.40064、a2＝0.03217、a3-0.36207; when 0.90<Cp0When the content is less than or equal to 1.00, a1＝1.46531、a2＝0.0286、a3-0.41283; when 1.00<Cp0When the content is less than or equal to 1.10, a1＝1.42887、a2＝0.02543、a3-0.38433; when 1.10<Cp0When the content is less than or equal to 1.20, a1＝1.41322、a2＝0.02434、a3-0.38244; when 1.20 is<Cp0When the content is less than or equal to 1.30, a1＝1.476、a2＝0.02142、a3-0.43998; when 1.30<Cp0When the content is less than or equal to 1.40, a1＝1.45、a2＝0.02193、a3＝-0.41467。
Preferably, the set effluent positive phosphorus concentration target control value CpSet to the following 6 th gear: 0.15 mg/L; 0.20 mg/L; 0.25 mg/L; 0.30 mg/L; 0.35 mg/L; 0.40 mg/L; the measured value change interval of the positive phosphorus concentration of the effluent is set as follows corresponding to the 6 grades: 0.12-0.165 mg/L; 0.16-0.22 mg/L; 0.2-0.275 mg/L; 0.24-0.33 mg/L; 0.28-0.385 mg/L; 0.32-0.44 mg/L.
Preferably, one gear of the 6 gears is selected to be set as an initial setting gear; when the concentration of the positive phosphorus in the effluent is measuredp1Two consecutive excesses of the initial setting CpThen C will bepThe first gear is reduced so as to increase the dosage; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive excesses of the initial setting CpThen continue to CpTwo levels are reduced to further increase the dosage, and when the dosage is reduced to the lowest level, the measured value C of the concentration of the positive phosphorus in the effluent isp1Still two consecutive excesses of the initial setting CpIf yes, alarming and prompting; when the concentration of the positive phosphorus in the effluent is measuredp1At CpThe corresponding measured value is not adjusted within the variation interval.
Preferably, one gear of the 6 gears is selected to be set as an initial setting gear; when the concentration of the positive phosphorus in the effluent is measuredp1Twice successive lowering to the initial setting CpThen C will bepThe first gear is improved, and the first gear is improved,thereby reducing the dosage; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive times lower than the initial setting CpThen continue to CpThe first gear is improved, so that the dosage is further reduced; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive times lower than the initial setting CpIf yes, alarming and prompting; when the concentration of the positive phosphorus in the effluent is measuredp1At CpThe corresponding measured value is not adjusted within the variation interval.
Preferably, the theoretical value of the total phosphorus in the effluent is obtained by the following formula:
CTP＝k2×CP，
wherein, CTP-theoretical value of total phosphorus in effluent; k is a radical of2Is 1.2; cp-set effluent orthophosphoric concentration target control (mg/L).
Preferably, the dosing system is suitable for a high-density tank or a chemical phosphorus removal tank without sludge backflow.
Compared with the prior art, the invention has the following beneficial effects:
1. the phosphorus value of inlet and outlet water of the high-density pond is detected in real time on line, the change condition of the water quality is mastered in time, the adding amount of the phosphorus removing agent is accurately calculated through the constructed mathematical model, the adding amount is adjusted in real time, the defects that the adding amount is constant adding and excessive adding according to manual experience are avoided, the quality of outlet water is guaranteed to reach the standard, and meanwhile, the adding amount of the phosphorus removing agent is controlled in a lower range as far as possible, so that the waste of the agent is reduced, and the operation cost is reduced.
2. The invention also considers the important influence of the high-density tank sludge backflow on the dephosphorization effect and the dosing amount, fully utilizes the medicament in the backflow sludge, corrects the medicament on the basis of the theoretical dosage and finally obtains the actual dosage; the characteristics and effects of different phosphorus removing agents are considered in a targeted manner, the total phosphorus value of the effluent is controlled within the range required by national standards or landmarks, and the dosage of the phosphorus removing agent is finely regulated and controlled, so that the medicine consumption is reduced to the maximum extent.
Drawings
FIG. 1 is a graph showing the drug consumption of the high density cell A and the high density cell B in the example.
FIG. 2 is a sectional view of a sludge settling zone of the high-density pond.
FIG. 3 is a schematic diagram of a beaker test.
In the figure: 1 is sample No. 1, 2 is sample No. 2, 3 is sample No. 3, and 4 is sample No. 4.
Detailed Description
The present invention will be further explained with reference to the following examples and drawings.
Intelligent adding system for chemical phosphorus removal agent in high-density tank
According to research, the influence of the change of the water quality of inlet water on the dosage is large, and after the change range of the water quality of inlet water is researched, the on-line phosphorus detector can output on-line monitoring data (the on-line phosphorus detector usually needs about 1 hour) in about 10 minutes due to no need of digestion compared with an on-line total phosphorus detector, can quickly and accurately display the change condition of the water quality of inlet water, can adjust the dosage in real time in advance, and can achieve the purpose of accurately controlling the dosage while ensuring that the water quality of outlet water reaches the standard.
A high-density tank chemical phosphorus removal agent intelligent adding system is arranged in the high-density tank, and comprises a water inlet flow meter, a water inlet positive phosphorus detector, a water outlet positive phosphorus detector and a dosing pump; the water inlet flow meter measures the water quantity of the water inlet pipe in real time and records the collected water inlet quantity; the water inlet positive phosphorus detector is used for measuring the water inlet positive phosphorus of the water inlet pipe in real time and recording the collected water inlet positive phosphorus value; the outlet positive phosphorus detector measures the outlet positive phosphorus of the outlet pipe in real time and records the collected outlet positive phosphorus value; the dosing pump doses the chemical according to the actual dosage of the chemical phosphorus removal agent.
The theoretical chemical phosphorus removal agent dosage of the intelligent high-density tank chemical phosphorus removal agent dosing system is determined by the following formula:
Figure BDA0003104603480000041
in the formula:
Cmtheoretical dosage of phosphorus removal agent(mg/L)。
Cp0-feed water phosphorus concentration (mg/L).
CpAnd setting a target control value (mg/L) of the concentration of the positive phosphorus in the effluent.
a1、a2-dimensionless empirical constants; wherein, a1、a2Obtained by nonlinear fitting of beaker test data by Origin Pro2018 software.
a3-having a dimensional empirical constant (L/mg); wherein, a3Obtained by nonlinear fitting of beaker test data by Origin Pro2018 software.
The beaker test is a chemical test method carried out by using a beaker, and a test instrument adopted in the invention is a six-connection stirrer, and mainly comprises six beakers as shown in figure 3. The beaker test mainly comprises the following operation steps:
1) and (4) taking a test water sample. The quality of the taken-back raw water is measured in a laboratory, such as total phosphorus, positive phosphorus, turbidity, temperature, pH and the like (when the turbidity is measured, the raw water sample in a barrel needs to be repeatedly stirred uniformly and then is quickly poured into a cuvette for testing).
2) The raw water to be tested is poured into 6 stirring cups (when a water sample is taken every time, the water sample in the bucket needs to be repeatedly stirred uniformly and then is added after the stirring cup is rinsed), when the water sample is added into the stirring cup, the water sample can properly exceed 1L scale, and the redundant water sample can be discharged to 1L scale through a sampling pipe on the stirring cup.
3) The mixing cup is placed in the mixing position of the mixer and the mixing paddle is lowered. And (3) sequentially placing the prepared phosphorus removing agent solution into 6 dosing test tubes from left to right (the dosing amount is from small to large) by using a liquid transfer gun according to the determined 6 dosing amounts.
4) And (3) starting the coagulation stirring equipment, and operating according to a set program (PAC is automatically added when the PAC is started for 30s, and PAM is manually and rapidly added when the PAM is rapidly stirred for the rest 1 min).
5) Water was taken from each blender cup to the erlenmeyer flask at the end of the precipitation (the erlenmeyer flasks numbered sequentially from left to right: no. 1-6), and measuring water quality indexes such as total phosphorus and positive phosphorus.
The dosage of the actual chemical phosphorus removal agent is determined by the following formula:
Figure BDA0003104603480000051
in the formula: v, adding the medicine amount per hour (L/h) by a medicine adding pump; k is a radical of1-high density pond sludge influence correction factor; q-high density pool water inlet flow (m)3H); rho is the density (kg/L) of the phosphorus removing agent; cmTheoretical dosage (mg/L) of phosphorus removal agent.
In specific implementation, the phosphorus removing agent is selected from one of liquid polyaluminum chloride (PAC) or liquid polyferric sulfate (PFS), and can also be used for other phosphorus removing agents, but a needs to be determined again through a beaker test1、a2And a3。
The phosphorus concentration value C of the inlet water of the high density tankp0Is divided into the following 10 intervals, Cp0≤0.50；0.50<Cp0≤0.60；0.60<Cp0≤0.70；0.70<Cp0≤0.80；0.80<Cp0≤0.90；0.90<Cp0≤1.00；1.00<Cp0≤1.10；1.10<Cp0≤1.20；1.20<Cp0≤1.30；1.30<Cp0Less than or equal to 1.40 (mg/L); when the positive phosphorus value of the inlet water falls in any interval, C in the theoretical chemical phosphorus removal agent dosage calculation formulap0The maximum value of the interval in which this value lies is taken. For example, when Cp0At 0.3, the value is at Cp0Within the interval of less than or equal to 0.50, Cp0Taking the maximum value in the interval, i.e. Cp0The value is 0.5; when C is presentp0At 0.51, the value is 0.50<Cp0In the interval of less than or equal to 0.60, then C isp0The value is 0.6, and so on.
When the phosphorus removal agent is liquid aluminum Polychloride (PAC); when C is presentp0When the content is less than or equal to 0.50, a1＝1.26043，a2＝0.01723，a3-0.28809; when 0.50<Cp0When the content is less than or equal to 0.60, a1＝1.41013、a2＝0.01227、a3-0.42059; when 0.60<Cp0When the content is less than or equal to 0.70, a1＝1.38896、a2＝0.0128、a3-0.35934; when 0.70<Cp0When the content is less than or equal to 0.80, a1＝1.42135、a2＝0.01057、a3-0.40713; when 0.80<Cp0When the content is less than or equal to 0.90, a1＝1.30182、a2＝0.01169、a3-0.29793; when 0.90<Cp0When the content is less than or equal to 1.00, a1＝1.37882、a2＝0.00965、a3-0.36868; when 1.00<Cp0When the content is less than or equal to 1.10, a1＝1.36388、a2＝0.0091、a3-0.35271; when 1.10<Cp0When the content is less than or equal to 1.20, a1＝1.33737、a2＝0.00969、a3-0.3297; when 1.20 is<Cp0When the content is less than or equal to 1.30, a1＝1.30142、a2＝0.00939、a3-0.29497; when 1.30<Cp0When the content is less than or equal to 1.40, a1＝1.26282、a2＝0.00988、a3＝-0.261095。
When the phosphorus removal agent is liquid Polymeric Ferric Sulfate (PFS); when C is presentp0When the content is less than or equal to 0.50, a1＝1.3794、a2＝0.04615、a3-0.34017; when 0.50<Cp0When the content is less than or equal to 0.60, a1＝1.43995、a2＝0.03947、a3-0.39535; when 0.60<Cp0When the content is less than or equal to 0.70, a1＝1.33187、a2＝0.04161、a3-0.29017; when 0.70<Cp0When the content is less than or equal to 0.80, a1＝1.35559、a2＝0.03773、a3-0.31232; when 0.80<Cp0When the content is less than or equal to 0.90, a1＝1.40064、a2＝0.03217、a3-0.36207; when 0.90<Cp0When the content is less than or equal to 1.00, a1＝1.46531、a2＝0.0286、a3-0.41283; when 1.00<Cp0When the content is less than or equal to 1.10, a1＝1.42887、a2＝0.02543、a3-0.38433; when 1.10<Cp0When the content is less than or equal to 1.20, a1＝1.41322、a2＝0.02434、a3-0.38244; when 1.20 is<Cp0When the content is less than or equal to 1.30, a1＝1.476、a2＝0.02142、a3-0.43998; when 1.30<Cp0When the content is less than or equal to 1.40, a1＝1.45、a2＝0.02193、a3＝-0.41467。
The k1 value acquisition method comprises the following steps: obtaining a sludge sample returned from the high-density tank on a return pipe of the high-density tank, standing and precipitating for 30 minutes, skimming a supernatant, mixing the supernatant with a water sample obtained from a water inlet pipe of the high-density tank, and respectively preparing mixed liquids (simulating flocculation reaction zones of the high-density tank) with different sludge concentrations, wherein the prepared sludge mixed liquids have the following concentrations: 348mg/L, 688mg/L, 1022mg/L, 1350mg/L and 1671mg/L, then carrying out a beaker test (only adding a macromolecular coagulant aid PAM without adding a phosphorus removing agent), and investigating the effect of the high-density pond return sludge on removing the positive phosphorus (OP) and the Total Phosphorus (TP) in the taken water sample under the condition of not adding the phosphorus removing agent. Research shows that when the sludge concentration of the mixed liquid reaches more than 500mg/L, the removal rate of the total phosphorus and the positive phosphorus reaches more than 50 percent. And the dephosphorization effect shows a trend of better and better along with the rise of the sludge concentration, which proves the importance of the sludge backflow of the high-density tank and the proper increase of the sludge concentration in the reaction zone. Multiple tests show that in order to fully utilize the medicament in the returned sludge of the high-density tank, the concentration of the sludge in the flocculation reaction zone is not preferably less than 500mg/L and is preferably kept at about 1000 mg/L. In order to maintain a proper sludge concentration, the sludge discharge problem must be highly valued in the production run, as shown in fig. 2: the sludge concentration area is formed between the No. 1 sampling tube and the No. 3 sampling tube, the sludge level is kept between the No. 2 sampling tube and the No. 3 sampling tube during sludge discharge, and if the sludge level is too high, the effluent quality is easy to be deteriorated if the sludge level exceeds the No. 3 sampling tube; if the mud level is too low to be less than 2# sampling tube, easily lead to row mud concentration to reduce on the one hand, increase the follow-up processing burden and increase water loss, thereby easily lead to the mud concentration of backward flow mud concentration to reduce the mud concentration in flocculation reaction zone on the other hand, influence dephosphorization effect. When the system is suitable for the chemical phosphorus removal tank without sludge backflow, the influence of the sludge backflow on a water sample does not need to be considered, so that k1The value can be calculated as 1.0.
The set positive phosphorus concentration target control value C of the effluent waterpSet to the following 6 th gear: 0.15 mg/L; 0.20 mg/L; 0.25 mg/L; 0.30 mg/L; 0.35 mg/L; 0.40 mg/L; the measured value change interval of the positive phosphorus concentration of the effluent is set as follows corresponding to the 6 grades: 0.12-0.165 mg/L; 0.16-0.22 mg/L; 0.2 to 0.275 mg/L; 0.24-0.33 mg/L; 0.28-0.385 mg/L; 0.32-0.44 mg/L. When the concentration of the positive phosphorus in the effluent is measuredp1Two consecutive excesses of the initial setting CpThen C will bepThe first gear is reduced so as to increase the dosage; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive excesses of the initial setting CpThen continue to CpTwo levels are reduced to further increase the dosage, and when the dosage is reduced to the lowest level, the measured value C of the concentration of the positive phosphorus in the effluent isp1Still two consecutive excesses of the initial setting CpIf yes, alarming and prompting; when the concentration of the positive phosphorus in the effluent is measuredp1At CpThe corresponding measured value is not adjusted within the variation interval.
For example, a target control value C of the concentration of the positive phosphorus in the effluent is setp0.30mg/L, and the measured value change interval of the positive phosphorus concentration of the effluent is 0.24-0.33 mg/L. Detecting the concentration of the positive phosphorus in the effluent, if the concentration of the positive phosphorus in the effluent is actually measured Cp1If the concentration of the positive phosphorus in the effluent exceeds 0.33mg/L for two times, the target control value C of the concentration of the positive phosphorus in the effluent is determinedpLowering the first-gear, i.e. the target control value C of the concentration of the positive phosphorus in the effluentpThe dosage is increased by reducing the dosage from 0.3mg/L to 0.25 mg/L. Continuously detecting the positive phosphorus concentration of the effluent, and after downshifting, if the positive phosphorus concentration of the effluent is actually measured Cp1Continuously exceeding 0.33mg/L for two times, and continuously controlling the concentration of the positive phosphorus in the effluent to be the target control value CpLowering two steps, i.e. CpThe dosage is further increased by reducing the dosage from 0.25mg/L to 0.15 mg/L. If after that, the measured positive phosphorus concentration value C of the effluent waterp1If the content of the active ingredients still exceeds 0.33mg/L for two times, an alarm is given. Of course, if the measured value C of the concentration of the positive phosphorus in the effluent water is adjustedp1Within the range of 0.24-0.33 mg/L, no adjustment is performed. Wherein, the first adjustment is 1 gear, and the step length of the second and subsequent adjustments is 2 gears.
When the concentration of the positive phosphorus in the effluent is measuredp1Twice successive lowering to the initial setting CpThen C will bepThe first level is improved, so that the dosage is reduced; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive times lower than the initial setting CpThen continue to CpThe first gear is improved, so that the dosage is further reduced; when in useMeasured value of effluent phosphorus concentration Cp1Still two consecutive times lower than the initial setting CpIf yes, alarming and prompting; when the concentration of the positive phosphorus in the effluent is measuredp1At CpThe corresponding measured value is not adjusted within the variation interval.
Similarly, for example, a target control value C of the concentration of positive phosphorus in the effluent is setp0.30mg/L, and the measured value change interval of the positive phosphorus concentration of the effluent is 0.24-0.33 mg/L. Detecting the concentration of the positive phosphorus in the effluent, if the concentration of the positive phosphorus in the effluent is actually measured Cp1When the concentration of the positive phosphorus in the effluent is lower than 0.24mg/L for two times, the target control value C of the concentration of the positive phosphorus in the effluent is determinedpRaising the first grade, namely the target control value C of the concentration of the positive phosphorus in the effluentpThe dosage is reduced by increasing the dosage from 0.3mg/L to 0.35 mg/L. Continuously detecting the concentration of the positive phosphorus in the effluent, and after upgrading, if the concentration of the positive phosphorus in the effluent is actually measured Cp1The concentration of the positive phosphorus in the effluent is continuously controlled to be lower than 0.24mg/L for two timespRaising one gear, i.e. CpIncreasing the concentration of the wastewater from 0.35mg/L to 0.40mg/L, further reducing the dosage, and so on until the measured value C of the concentration of the positive phosphorus in the wastewater is adjustedp1Within the range of 0.24-0.33 mg/L, no adjustment is performed. Of course, if the measured value C of the concentration of phosphorus in the effluent isp1And if the concentration is still lower than 0.24mg/L for two times, giving an alarm for prompting. After receiving the alarm information, the person on duty should go to the site to check the working state of the on-line instrument and the dosing equipment immediately, and if the fault occurs, the maintenance operation is started immediately.
The theoretical value of the total phosphorus in the effluent is obtained by the following formula:
CTP＝k2×CP，
wherein, CTP-theoretical value of total phosphorus in effluent; k is a radical of2Is 1.2; cpAnd setting a target control value (mg/L) of the concentration of the positive phosphorus in the effluent.
The invention is suitable for high-density tanks (all referred to as high-density tanks) and also suitable for chemical phosphorus removal tanks without sludge backflow.
Second, example
Example 1
Two high-density tanks with completely same operation working conditions are selected in a certain sewage plant for comparison experiments, liquid polyaluminium chloride (PAC) is selected as a phosphorus removing agent, and the national standard first-level A standard discharge standard is adopted: the total phosphorus TP is less than or equal to 0.5 mg/L. The high-density pond A keeps the original dosing system unchanged, is controlled by operators according to experience, and is manually tested for water inlet and outlet of the high-density pond A every day because no positive phosphorus detector is arranged, and the positive phosphorus in the outlet water is below 0.1 mg/L.
The high-density pool B adopts the system to dose, three batches of wastewater positive phosphorus concentrations entering the high-density pool B are detected, and the water inlet positive phosphorus concentration C of the three batches of wastewater entering the high-density pool Bp0Respectively at 0.62mg/L, 0.82mg/L and 0.69mg/L, and setting the control target values of the positive phosphorus of the three effluent as follows: 0.3mg/L, 0.2mg/L and 0.15mg/L, and the control target values of the total phosphorus TP of the three batches of wastewater effluent are set as 0.36mg/L, 0.24mg/L and 0.18mg/L respectively.
Bringing the phosphorus concentration of the inlet water into a phosphorus concentration value C of the inlet waterp010 divided intervals, the first batch of wastewater is fed with water with positive phosphorus concentration Cp0Is 0.62mg/L, is located in the interval 0.60<Cp0Less than or equal to 0.70, and adding C in the formula for safety periodp0Taking the maximum value in this interval, i.e. Cp0Value 0.70 and corresponding to a in the interval1＝1.38896、a2＝0.0128、a3Under the condition of-0.35934, controlling the effluent to be the target value C of the positive phosphorusp0.3mg/L substituting equation:
Figure BDA0003104603480000081
the theoretical dosage C of the phosphorus removing agent is obtained by calculationm59.6 mg/L. Considering the characteristic that the high-density tank has sludge backflow, the actual dosage of the metering pump (reading of the flowmeter) is calculated by adopting the following formula:
Figure BDA0003104603480000082
wherein, because the embodiment adopts the high-density tank, the medicament in the returned sludge of the high-density tank can also play a role of dephosphorization in the reaction zoneThe effect of the method is that the sludge backflow problem must be highly regarded, the sludge concentration in the reaction zone should be at least kept to be more than 500mg/L so as to fully utilize the medicament in the backflow sludge, the actual dosage of the high-density tank phosphorus removal agent is less than the dosage calculated theoretically, a correction coefficient must be considered on the basis of the theoretical dosage, and the correction coefficient k in the embodiment is1Value 0.6, different sewage plants k1May be different and require testing on site.
In the embodiment, the inflow flow of the three batches of wastewater entering the high-density pond B is 1587m3And h, the density of the liquid polyaluminium chloride (PAC) as the phosphorus removing agent is 1.15mg/L, and the actual dosage of the first batch of wastewater is calculated by substituting the data into the formula (2): 49.4L/h (flowmeter reading), corresponding to actual drug consumption: 36 mg/L; according to the calculation, the dosage of the second batch and the third batch is 106.5L/h (reading of a flowmeter) and 92.0L/h (reading of the flowmeter), and the corresponding actual medicine consumption is as follows: 77mg/L, 67 mg/L.
And respectively adding the phosphorus removal agent with the dosage into the three batches of wastewater in the high-density pond B for phosphorus removal, and detecting the quality of effluent, wherein the actual values of the positive phosphorus of the three batches of wastewater in the high-density pond B are respectively 0.25mg/L, 0.18mg/L and 0.13 mg/L.
TABLE 1
Figure BDA0003104603480000091
Referring to fig. 1, and in conjunction with table 1, it can be seen that: for the high-density pond A (first stage), because an intelligent dosing system is not provided, operators have no heart, and in order to ensure that the water quality reaches the standard, the total phosphorus in the effluent is controlled to be very low by overdosing, which is far lower than the requirement of national first-level A (less than or equal to 0.5 mg/L). Even in the case that the total phosphorus in the high-density pond inlet water of the second batch and the third batch reaches the standard, a large amount of medicine is also administered, and the medicine waste is very serious. For the high-density pool B (second stage), due to the intelligent dosing system, a central number can be achieved during dosing, although the positive phosphorus and the total phosphorus of the inlet water are much higher than those of the high-density pool A (first stage), the total phosphorus of the outlet water can be controlled below a set target value through reasonable dosing amount, and the dosing amount is at least 30% lower than that of the high-density pool A (first stage). Meanwhile, on the premise of ensuring that the total phosphorus of the effluent reaches the standard, the effluent control target value can be adequately improved by the bottom gas, and the dosage is obviously reduced.
Through measurement and calculation, 7 km for the plant3The design scale of a day is that after the invention is adopted, the medicine consumption can be saved by at least 20 percent every year on the basis of 2020, the medicine cost can be saved by 48 ten thousand yuan, the modification cost can be recovered in about three years, and the economic benefit is considerable.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.

Claims (10)

1. An intelligent dosing system for a chemical phosphorus removal agent of a high-density tank is characterized by comprising a water inlet flow meter, a water inlet positive phosphorus detector, a water outlet positive phosphorus detector and a dosing pump; the water inlet flow meter measures the water quantity of the water inlet pipe in real time and records the collected water inlet quantity; the water inlet positive phosphorus detector is used for measuring the water inlet positive phosphorus of the water inlet pipe in real time and recording the collected water inlet positive phosphorus value; the outlet positive phosphorus detector measures the outlet positive phosphorus of the outlet pipe in real time and records the collected outlet positive phosphorus value; the dosing pump is used for dosing according to the actual dosing amount of the chemical phosphorus removal agent;
the theoretical chemical phosphorus removal agent dosage of the intelligent high-density tank chemical phosphorus removal agent dosing system is determined by the following formula:
Figure FDA0003104603470000011
in the formula:
Cmtheoretical dosage (mg/L) of the phosphorus removal agent;
Cp0-inlet water phosphorus concentration (mg/L);
Cp-set effluent positive phosphorus concentration targetControl value (mg/L);
a1、a2-dimensionless empirical constants;
a3-having a dimensional empirical constant (L/mg);
the dosage of the actual chemical phosphorus removal agent is determined by the following formula:
Figure FDA0003104603470000012
in the formula: v, adding the medicine amount per hour (L/h) by a medicine adding pump; k is a radical of1-high density pond sludge influence correction factor; q-high density pool water inlet flow (m)3H); rho is the density (kg/L) of the phosphorus removing agent; cmTheoretical dosage (mg/L) of phosphorus removal agent.
2. The intelligent dosing system for high-density pond chemical phosphorus removal agent according to claim 1, wherein the phosphorus removal agent is selected from one of liquid polyaluminium chloride (PAC) or liquid polyferric sulfate (PFS).
3. The intelligent dosing system for chemical phosphorus removal agent in high-density tank as claimed in claim 2, wherein the positive phosphorus concentration value C of inlet water of high-density tankp0Is divided into the following 10 intervals, Cp0≤0.50；0.50<Cp0≤0.60；0.60<Cp0≤0.70；0.70<Cp0≤0.80；0.80<Cp0≤0.90；0.90<Cp0≤1.00；1.00<Cp0≤1.10；1.10<Cp0≤1.20；1.20<Cp0≤1.30；1.30<Cp0Less than or equal to 1.40 (mg/L); when the positive phosphorus value of the inlet water falls in any interval, C in the theoretical chemical phosphorus removal agent dosage calculation formulap0The maximum value of the interval in which this value lies is taken.
4. The intelligent dosing system for chemical phosphorus removal agents in a dense pool as defined in claim 3, wherein the phosphorus removal agent is liquid aluminum Polychlorid (PAC); when C is presentp0When the content is less than or equal to 0.50, a1＝1.26043，a2＝0.01723，a3-0.28809; when 0.50<Cp0When the content is less than or equal to 0.60, a1＝1.41013、a2＝0.01227、a3-0.42059; when 0.60<Cp0When the content is less than or equal to 0.70, a1＝1.38896、a2＝0.0128、a3-0.35934; when 0.70<Cp0When the content is less than or equal to 0.80, a1＝1.42135、a2＝0.01057、a3-0.40713; when 0.80<Cp0When the content is less than or equal to 0.90, a1＝1.30182、a2＝0.01169、a3-0.29793; when 0.90<Cp0When the content is less than or equal to 1.00, a1＝1.37882、a2＝0.00965、a3-0.36868; when 1.00<Cp0When the content is less than or equal to 1.10, a1＝1.36388、a2＝0.0091、a3-0.35271; when 1.10<Cp0When the content is less than or equal to 1.20, a1＝1.33737、a2＝0.00969、a3-0.3297; when 1.20 is<Cp0When the content is less than or equal to 1.30, a1＝1.30142、a2＝0.00939、a3-0.29497; when 1.30<Cp0When the content is less than or equal to 1.40, a1＝1.26282、a2＝0.00988、a3＝-0.261095。
5. The intelligent dosing system for chemical phosphorus removal agents in a dense pool as defined in claim 3, wherein the phosphorus removal agent is liquid Polymeric Ferric Sulfate (PFS); when C is presentp0When the content is less than or equal to 0.50, a1＝1.3794、a2＝0.04615、a3-0.34017; when 0.50<Cp0When the content is less than or equal to 0.60, a1＝1.43995、a2＝0.03947、a3-0.39535; when 0.60<Cp0When the content is less than or equal to 0.70, a1＝1.33187、a2＝0.04161、a3-0.29017; when 0.70<Cp0When the content is less than or equal to 0.80, a1＝1.35559、a2＝0.03773、a3-0.31232; when 0.80<Cp0When the content is less than or equal to 0.90, a1＝1.40064、a2＝0.03217、a3-0.36207; when 0.90<Cp0When the content is less than or equal to 1.00, a1＝1.46531、a2＝0.0286、a3-0.41283; when 1.00<Cp0When the content is less than or equal to 1.10, a1＝1.42887、a2＝0.02543、a3-0.38433; when 1.10<Cp0When the content is less than or equal to 1.20, a1＝1.41322、a2＝0.02434、a3-0.38244; when 1.20 is<Cp0When the content is less than or equal to 1.30, a1＝1.476、a2＝0.02142、a3-0.43998; when 1.30<Cp0When the content is less than or equal to 1.40, a1＝1.45、a2＝0.02193、a3＝-0.41467。
6. The chemical phosphorus removal agent feeding system of claim 3, wherein the set target control value C of the positive phosphorus concentration of the effluent is setpSet to the following 6 th gear: 0.15 mg/L; 0.20 mg/L; 0.25 mg/L; 0.30 mg/L; 0.35 mg/L; 0.40 mg/L; the measured value change interval of the positive phosphorus concentration of the effluent is set as follows corresponding to the 6 grades: 0.12-0.165 mg/L; 0.16-0.22 mg/L; 0.2-0.275 mg/L; 0.24-0.33 mg/L; 0.28-0.385 mg/L; 0.32-0.44 mg/L.
7. The intelligent dosing system for chemical phosphorus removal agents in a high-density pond according to claim 3, wherein one of the 6 gears is selected as an initial setting gear; when the concentration of the positive phosphorus in the effluent is measuredp1Two consecutive excesses of the initial setting CpThen C will bepThe first gear is reduced so as to increase the dosage; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive excesses of the initial setting CpThen continue to CpTwo levels are reduced to further increase the dosage, and when the dosage is reduced to the lowest level, the measured value C of the concentration of the positive phosphorus in the effluent isp1Still two consecutive excesses of the initial setting CpIf yes, alarming and prompting; when the concentration of the positive phosphorus in the effluent is measuredp1At CpThe corresponding measured value is not adjusted within the variation interval.
8. The intelligent dosing system for chemical phosphorus removal agents in a high-density pond according to claim 3, wherein one of the 6 gears is selected as an initial setting gear; when the concentration of the positive phosphorus in the effluent is measuredp1Twice successive lowering to the initial setting CpThen C will bepIncrease the first gear to reduce the dosageAn amount; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive times lower than the initial setting CpThen continue to CpThe first gear is improved, so that the dosage is further reduced; when the concentration of the positive phosphorus in the effluent is measuredp1Still two consecutive times lower than the initial setting CpIf yes, alarming and prompting; when the concentration of the positive phosphorus in the effluent is measuredp1At CpThe corresponding measured value is not adjusted within the variation interval.
9. The intelligent dosing system for chemical phosphorus removal agents in the dense pool as claimed in claim 1, wherein the theoretical value of total phosphorus in effluent is obtained by the following formula:
CTP＝k2×CP，
wherein, CTP-theoretical value of total phosphorus in effluent; k is a radical of2Is 1.2; cp-set effluent orthophosphoric concentration target control (mg/L).
10. The intelligent dosing system for chemical phosphorus removal agents in the high-density tank as claimed in claim 1, wherein the dosing system is suitable for the high-density tank or the chemical phosphorus removal tank without sludge backflow.
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