CN213707871U - Accurate adding system of denitrification filtering pond carbon source - Google Patents
Accurate adding system of denitrification filtering pond carbon source Download PDFInfo
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- CN213707871U CN213707871U CN202022366452.5U CN202022366452U CN213707871U CN 213707871 U CN213707871 U CN 213707871U CN 202022366452 U CN202022366452 U CN 202022366452U CN 213707871 U CN213707871 U CN 213707871U
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Abstract
A carbon source accurate feeding system of a denitrification filter comprises a water inlet pipe, a carbon source mixing tank, the denitrification filter, a denitrification filter water inlet pipe duct, a denitrification filter water outlet pipe duct and a carbon source feeding pump; an inlet of the carbon source mixing tank is connected with a water inlet pipe, a denitrification filter water inlet pipe channel is connected between an outlet of the carbon source mixing tank and an inlet of the denitrification filter, and an outlet of the denitrification filter is connected with a denitrification filter water outlet pipe channel; the device comprises a water inlet pipe, a carbon source mixing tank, a denitrification filter, an on-line nitrite instrument, a first on-line nitrate instrument, a second on-line nitrate instrument, a first on-line dissolved oxygen instrument, a second on-line nitrite instrument, a second on-line dissolved oxygen instrument and a second on-line nitrite instrument are arranged on the water outlet pipe of the denitrification filter. The system has the advantages of accurate carbon source adding, carbon source adding cost saving and low overproof water outlet risk.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to accurate dosing system of denitrification filtering pond carbon source and operation method.
Background
A large number of typical engineering case researches show that due to the lack of fine design, a large number of existing denitrification filter carbon source adding systems have the practical problems that the risk of over-standard TN of outlet water is large due to the fact that the adding amount of a carbon source is small, or the risk of over-standard COD of outlet water is large and the adding cost of the carbon source is high due to the fact that the adding amount of the carbon source is large. The problem that the existing denitrification filter carbon source adding system is lack of fine design is mainly reflected in the following three aspects.
Firstly, the influence of nitrite accumulation in the denitrification reaction process on the calculation of the carbon source adding flow is not considered. According to research, the actual nitrite accumulation amount of most denitrification filters is generally 1-1.5 mg/L, and the actual nitrite accumulation amount is even up to more than 3 mg/L. Under the condition that the carbon source adding amount of the denitrification filter tank is calculated by taking the control concentration of the nitrate in the effluent water as a calculation reference, the actual adding amount of the carbon source is low due to the accumulation of the nitrite in the denitrification filter tank, and the risk that the TN (total nitrogen) of the effluent water exceeds the standard is high.
Secondly, the on-line dissolved oxygen instrument setting point of the existing denitrification filter carbon source adding system is unreasonable. On the basis of the loss influence of dissolved oxygen on the carbon source added by the denitrification filter, the online dissolved oxygen meters of the existing denitrification filter carbon source adding system are usually arranged on the water inlet pipe duct of the denitrification filter, and because drop reoxygenation when water is distributed in the water inlet distribution tank in the downflow denitrification filter and drop reoxygenation when water is distributed along the water inlet pipe duct of the upflow denitrification filter are not considered, the dissolved oxygen concentration tested by the online dissolved oxygen meters arranged by the existing carbon source adding system is usually lower than the actual dissolved oxygen concentration of inflow in the denitrification filter, so that the problems of lower actual carbon source adding amount and higher TN standard exceeding risk of outflow water are caused.
Thirdly, the carbon source adding coefficient selected according to theory, experience and the like is not accurate. The carbon source adding coefficient is an important parameter of a denitrification filter carbon source adding amount calculation formula, whether the carbon source adding amount calculation formula accurately influences whether the carbon source is accurately added or not is determined, however, the carbon source adding coefficient of the existing denitrification filter carbon source adding system is generally selected according to theory, experience and the like, and the normally selected carbon source adding coefficient is larger or smaller, so that the actual carbon source adding amount is inaccurate, and further, the running problems that the risk of the TN (total oxygen) of outlet water is larger than standard, the risk of the COD (chemical oxygen demand) of the outlet water is larger, the cost of adding the carbon source is.
Based on the analysis, in order to ensure accurate addition of the carbon source in the denitrification filter of the sewage treatment plant with high discharge standard, the carbon source addition system of the denitrification filter is designed in a refined manner in terms of considering nitrite accumulation, optimizing the setting of an online dissolved oxygen instrument for water inlet of the denitrification filter, calculating and determining the carbon source addition coefficient and the like.
In order to solve the problem of inaccurate carbon source adding amount existing in the existing denitrification filter carbon source adding system, a denitrification filter carbon source accurate adding system and an operation method need to be provided urgently to guide the refined design and operation of the denitrification filter carbon source adding system of the urban sewage treatment plant with the high discharge standard in China.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming current denitrification filter carbon source dosing system's defect, a accurate dosing system of denitrification filter carbon source is provided, this system is used for surveing the online nitrite appearance of the nitrite of denitrification process accumulation through setting up, it is definite to optimize the calculation that sets up meticulous designs such as online dissolved oxygen appearance test probe and carbon source dosing coefficient, the actual carbon source that can solve current denitrification filter carbon source dosing system existence throws volume on the large side or on the small side, it is big that the risk exceeds standard to go out the water, the carbon source throws the operation problem with high costs, it throws the material to have the carbon source accuracy, save the carbon source and throw the cost, it exceeds standard the advantage that the risk is low to go out the water.
As the conception, the technical proposal of the utility model is that: a carbon source accurate feeding system of a denitrification filter comprises a water inlet pipe, a carbon source mixing tank, the denitrification filter, a denitrification filter water inlet pipe duct, a denitrification filter water outlet pipe duct and a carbon source feeding pump; an inlet of the carbon source mixing tank is connected with a water inlet pipe, a denitrification filter water inlet pipe channel is connected between an outlet of the carbon source mixing tank and an inlet of the denitrification filter, and an outlet of the denitrification filter is connected with a denitrification filter water outlet pipe channel; the device comprises a water inlet pipe, a carbon source mixing tank, a denitrification filter, an on-line nitrite instrument, a first on-line nitrate instrument, a second on-line nitrate instrument, a first on-line dissolved oxygen instrument, a second on-line nitrite instrument, a second on-line dissolved oxygen instrument and a second on-line nitrite instrument are arranged on the water outlet pipe of the denitrification filter.
Further, the online flowmeter, the first online nitrate meter, the online nitrite meter, the second online nitrate meter and the online dissolved oxygen meter are respectively connected with the input end of the carbon source adding controller, and the output end of the carbon source adding controller is connected with the carbon source adding pump.
Further, the carbon source feeding pump is a variable frequency pump with combined large and small power.
Furthermore, a test probe of the online dissolved oxygen meter is arranged in the denitrification filter tank, and the water distribution area of the downward flow denitrification filter tank is 5-10 cm below the lowest operating liquid level or the upward flow denitrification filter tank.
Further, the carbon source feeding pump feeds a carbon source which is sodium acetate.
Further, the carbon source feeding pump feeds the carbon source by adopting acetic acid.
The utility model has the advantages of it is following and positive effect:
1. the utility model discloses a set up the online nitrite appearance that is used for surveing the nitrite of denitrification process accumulation, it is confirmed to optimize the calculation that sets up meticulous designs such as online dissolved oxygen appearance test probe and carbon source addition coefficient, can solve that the carbon source that current denitrification filter carbon source addition system exists is thrown the volume and is not enough to lead to that the TN that goes out water exceeds standard risk greatly or the carbon source is excessive to be thrown and is leaded to that the COD that goes out water exceeds standard risk greatly, the running problem such as cost height is thrown to the carbon source, compare with current denitrification filter carbon source addition system, it throws to have the carbon source accuracy, save the carbon source and throw the cost, it is low to go out water risk that exceeds standard.
2. The utility model discloses a controller is thrown to carbon source has considered the nitrite accumulation of denitrification process to the influence that denitrification filter carbon source thrown the flow calculation, throw the volume calculation benchmark with the carbon source and change into water nitrate and nitrite control concentration by usual water nitrate control concentration, and increased the required carbon source volume of denitrification in-process nitrate transformation nitrite in the carbon source throw volume computational formula, can solve the carbon source that current denitrification filter carbon source dosing system does not consider the nitrite accumulation to lead to and throw the volume low problem partially.
3. The utility model discloses consider in the denitrification filtering pond and the drop oxygenation problem of intake pipe canal on journey, optimize the denitrification filtering pond intake on line dissolved oxygen appearance setpoint to the denitrification filtering pond by usual intake pipe canal in (the minimum below the operation liquid level of downflow denitrification filtering pond 5 ~ 10cm department or upflow denitrification filtering pond water distribution district), make the actual dissolved oxygen concentration that dissolved oxygen appearance actual measurement was measured on line can really characterize the loss denitrification filtering pond and throw the actual dissolved oxygen concentration of throwing the carbon source, can solve the unreasonable carbon source that leads to of current denitrification filtering pond carbon source dosing system intake on line dissolved oxygen appearance setpoint and throw the volume low problem partially.
4. The utility model discloses the coefficient is thrown to the carbon source of selecting is accurate, can solve the carbon source that current denitrification filtering pond carbon source dosing system selected and throw the carbon source that the coefficient is big on the left or little leads to and throw the volume on the left and high or low on the left.
5. The utility model discloses pertinence, practicality and maneuverability are strong, can provide the reference for the design that becomes more meticulous and the operation of town sewage treatment plant denitrification filter carbon source dosing system under the high emission standard of china, and stable up to standard and energy saving and consumption reduction to high emission standard sewage treatment plant have the significance.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the carbon source accurate adding system of the denitrification filter tank of the present invention.
Description of reference numerals: 1-a carbon source mixing tank; 2-denitrification filter; 3-water inlet pipe; 4-denitrification filter water inlet pipe canal; 5-a denitrification filter outlet pipe duct; 6-carbon source adding controller; 7-an on-line flowmeter arranged at the water inlet pipe; 8-a first online nitrate meter; 9-carbon source feeding pump; 10-an online dissolved oxygen instrument with a test probe arranged in the denitrification filter tank; 11-a test probe; 12-an online nitrite meter arranged in a water outlet pipe duct of the denitrification filter; 13-second online nitrate meter.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1: a system for accurately adding a carbon source to a denitrification filter comprises a water inlet pipe 3, a carbon source mixing tank 1, a denitrification filter 2, a denitrification filter water inlet pipe duct 4, a denitrification filter water outlet pipe duct 5 and a carbon source adding controller 6. An inlet of the carbon source mixing tank 1 is connected with a water inlet pipe 3, a denitrification filter water inlet pipe duct 4 is connected between an outlet of the carbon source mixing tank and an inlet of the denitrification filter 2, and an outlet of the denitrification filter is connected with a denitrification filter water outlet pipe duct 5; an online flowmeter 7 and a first online nitrate meter 8 are arranged on the water inlet pipe 3, the carbon source mixing tank 1 is connected with a carbon source feeding pump 9, a test probe 11 of an online dissolved oxygen meter 10 is arranged in the denitrification filter tank 2, and an online nitrite meter 12 and a second online nitrate meter 13 are arranged on the denitrification filter tank water outlet pipe duct 5; the input end of the carbon source adding controller is connected with the online flowmeter 7, the first online nitrate meter 8, the online nitrite meter 12, the second online nitrate meter 13 and the online dissolved oxygen meter 10 to receive the output information of the online flowmeter, the first online nitrate meter, the second online nitrate meter and the online dissolved oxygen meter, and the output end of the carbon source adding controller 6 is connected with the carbon source adding pump 9.
The on-line nitrite meter 12 arranged on the denitrification filter outlet pipe duct 5 is used for measuring the nitrite concentration accumulated in the denitrification reaction process of the denitrification filter 2 in real time and transmitting the nitrite concentration to the carbon source adding controller 6 in real time as an important input parameter for calculating the real-time carbon source adding flow.
The test probe 11 of the online dissolved oxygen meter 10 is arranged in the denitrification filter 2 and used for measuring the inflow dissolved oxygen concentration of the denitrification filter in real time and transmitting the inflow dissolved oxygen concentration to the carbon source adding controller 6 in real time as an important input parameter for calculating the adding flow of the carbon source in real time. When the down-flow denitrification filter tank is adopted, the test probe of the on-line dissolved oxygen meter is arranged at a position 5-10 cm below the lowest operating liquid level when the denitrification filter tank is used for filtering, and when the up-flow denitrification filter tank is adopted, the test probe of the on-line dissolved oxygen meter is arranged in a water distribution area of the denitrification filter tank.
The denitrification filter outlet pipe duct 5 is provided with a second online nitrate meter 13 which is mainly used for calculating a carbon source adding coefficient in a debugging period of the denitrification filter 2 and providing important parameter support for accurately determining the real-time carbon source adding flow of the carbon source adding controller 6.
The carbon source feeding pump 9 is a variable frequency pump with a large power and a small power combined configuration.
The added carbon source adopts rapid carbon sources such as sodium acetate or acetic acid.
The real-time carbon source of controller 6 is thrown to carbon source throws that flow calculation uses denitrification filter 2 play water nitrate and nitrite control concentration as the calculation benchmark, and carbon source throwing coefficient in the flow calculation formula is thrown to carbon source and is based on the different actual operation data under setting for the carbon source volume of throwing of denitrification filter debugging phase and calculate the determination. The carbon source adding controller 6 calculates and determines the adding flow of the real-time carbon source through a carbon source adding flow calculation formula according to the input concentration of the nitrate in the water, the concentration of the nitrite in the water, the concentration of the dissolved oxygen in the inflow, and the set concentration of the nitrate and the nitrite in the water, which are measured by the first online nitrate meter 8, the concentration of the nitrite in the water, the concentration of the dissolved oxygen in the inflow, and the concentration of the nitrate and the nitrite in the water, which are input in real time, and instructs the carbon source adding pump 9 to dynamically regulate and.
The operation method of the accurate carbon source adding system of the denitrification filter comprises the following steps:
a. setting parameters: the control concentration of nitrate and nitrite in the effluent of the denitrification filter is set as (C)Nitrate is produced +CProduce nitrite)ControlIn which C isNitrate is producedIs the concentration of nitrate in the effluent of the denitrification filter CProduce nitriteThe nitrite concentration of the effluent of the denitrification filter tank; setting the carbon source adding amount for calculating the carbon source adding coefficient in the debugging period of the denitrification filter tank as S1、S2；
b. Calculating the carbon source adding coefficient: based on the formula S ═ m [ C ]Into nitrate-(CNitrate is produced+CProduce nitrite)]+n*CProduce nitrite+DOInflow of fluidCalculating and determining the carbon source adding coefficientThe middle S is the adding amount of the carbon source, and the unit is mg/LCOD; m is the carbon source adding coefficient for converting nitrate into nitrogen, and n is the carbon source adding coefficient for converting nitrate into nitrite; cInto nitrateFor the nitrate concentration, DO, of the influent water of the denitrification filterInflow of fluidThe DO concentration of the inflow of the denitrification filter is mg/L; according to the carbon source adding amount S set in the debugging period of the denitrification filter1And S2Calculating and determining specific carbon source adding coefficients m and n of the denitrification filter by combining actual running data and a carbon source adding coefficient calculation formula simultaneous equation set;
c. determining a carbon source adding flow calculation formula: the carbon source adding controller calculates the adding amount of the carbon source in real time to control the concentration C by using nitrate and nitrite in the effluent of the denitrification filterControlFor the calculation reference, the carbon source adding coefficient is the specific carbon source adding coefficient m, n calculated and determined by the simultaneous equation set in the debugging period of the denitrification filter, and on the basis, the real-time carbon source adding flow calculation formula q is determinedThrow-in＝QInflow water*{m*[CInto nitrate-(CNitrate is produced+CProduce nitrite)Control]+n*C Produce nitrite+DOInflow of fluid1440 ρ f k), where q isThrow-inAdding flow rate for carbon source, wherein the unit is L/min; qInflow waterIs the water inflow of the denitrification filter tank, and the unit is m3D; rho is the density of the added carbon source, and the unit is g/L; f is the effective content of the carbon source; k is carbon source COD equivalent, and the unit is gCOD/g carbon source;
d. calculating the adding flow of the carbon source in real time: denitrification filter intake water real-time nitrate concentration C measured by first online nitrate nitrogen instrument in real timeInto nitrateAnd the denitrification filter effluent real-time nitrite concentration C is measured by an online nitrite meter in real timeProduce nitriteDenitrification filter inflow real-time DO concentration DO measured by online dissolved oxygen meter in real timeInflow of fluidAll as input parameters are transmitted to a carbon source adding controller in real time, and the adding controller calculates and determines the real-time carbon source adding flow q required by the enhanced denitrification of the denitrification filter according to a set determined carbon source adding flow calculation formulaThrow-in；
e. Adjusting and controlling the adding flow of a carbon source adding pump in real time: carbon source adding controller rootAdding flow q according to the real-time carbon source required by the enhanced denitrification of the denitrification filterThrow-inAnd regulating and controlling the adding flow of the carbon source added to the carbon source mixing tank by the carbon source adding pump in real time according to the calculated result.
The operation method of the denitrification filter carbon source accurate adding system is described in detail by the following embodiments, and comprises the following steps:
a. and setting parameters. The control concentration of nitrate and nitrite in the effluent of the denitrification filter is set as (C)Nitrate is produced +CProduce nitrite)ControlIn which C isNitrate is producedIs the concentration of nitrate in the effluent of the denitrification filter CProduce nitriteThe nitrite concentration of the effluent of the denitrification filter is the effluent of the denitrification filter, and the effluent is under the national first-class A standard (C)Nitrate is produced+CProduce nitrite)ControlMay be 12 mg/L; setting carbon source adding quantity S for carbon source adding coefficient calculation in denitrification filter debugging period1、S230mg/L and 40mg/L respectively;
b. and (4) calculating the carbon source adding coefficient. Based on the formula S ═ m [ C ]Into nitrate-(CNitrate is produced+CProduce nitrite)]+n*CProduce nitrite+DOInflow of fluidCalculating and determining a carbon source adding coefficient, wherein S is the adding amount of the carbon source and the unit is mg/LCOD; m is the carbon source adding coefficient for converting nitrate into nitrogen, and n is the carbon source adding coefficient for converting nitrate into nitrite; cInto nitrateFor the nitrate concentration, DO, of the influent water of the denitrification filterInflow of fluidThe DO concentration of the inflow of the denitrification filter is mg/L; according to the carbon source adding amount S set in the debugging period of the denitrification filter1、S2Actual operation data of 30mg/L and 40mg/L are respectively combined with a carbon source adding coefficient calculation formula simultaneous equation set to calculate and determine specific carbon source adding coefficients m and n of the denitrification filter to be 3.8 and 1.53 respectively;
c. and determining a carbon source adding flow calculation formula. Carbon source adding controller for real-time calculation of carbon source adding flow rate to control concentration C by using nitrate and nitrite in effluent of denitrification filterControlFor the calculation reference, the carbon source adding coefficient is a specific carbon source determined by the calculation of a simultaneous equation set in the debugging period of the denitrification filterDetermining a real-time carbon source adding flow calculation formula q on the basis of the adding coefficients m and nThrow-in＝QInflow water*{3.8*[CInto nitrate-(CNitrate is produced+CProduce nitrite) Control]+1.53*CProduce nitrite+DOInflow of fluid1440 ρ f 0.6), wherein q isThrow-inAdding flow rate for carbon source, wherein the unit is L/min; qInflow waterIs the water inflow of the denitrification filter tank, and the unit is m3D; rho is the density of the added carbon source, and the unit is g/L; f is the effective content of the carbon source; k is carbon source COD equivalent, the unit is gCOD/g carbon source, and k of carbon source sodium acetate is 0.6;
d. and calculating the adding flow of the carbon source in real time. Denitrification filter intake water real-time nitrate concentration C measured by first online nitrate nitrogen instrument in real timeInto nitrate18mg/L denitrification filter effluent real-time nitrite concentration C measured by on-line nitrite meter in real timeProduce nitrite1.5mg/L denitrification filter inflow real-time DO concentration DO measured by online dissolved oxygen meter in real timeInflow of fluid8mg/L are all used as input parameters to be transmitted to a carbon source adding controller in real time, and the adding flow q of the real-time carbon source required by the enhanced denitrification of the denitrification filter is calculated and determined according to a set determined carbon source adding flow calculation formulaThrow-in＝QInflow water*{3.8*[18-12]+1.53*1.5+8}/(1440*ρ*f*0.6)＝QInflow water *33.1/(1440*ρ*f*0.6)；
e. And the adding flow of the carbon source adding pump is regulated and controlled in real time. A carbon source adding controller adds the flow q according to the real-time carbon source required by the enhanced denitrification of the denitrification filterThrow-inAnd regulating and controlling the adding flow of the carbon source added to the carbon source mixing tank by the carbon source adding pump in real time according to the calculated result.
Example 2: the method comprises the following steps:
a. and setting parameters. The control concentration of nitrate and nitrite in the effluent of the denitrification filter is set as (C)Nitrate is produced +CProduce nitrite)ControlIn which C isNitrate is producedIs the concentration of nitrate in the effluent of the denitrification filter CProduce nitriteThe nitrite concentration of the effluent of the denitrification filter is controlled under the relatively severe local discharge standard (C)Nitrate is produced+CProduce nitrite)ControlIs 7 mg/L; setting carbon source adding quantity S for carbon source adding coefficient calculation in denitrification filter debugging period1、S2Respectively 20mg/L and 30 mg/L;
b. and (4) calculating the carbon source adding coefficient. Based on the formula S ═ m [ C ]Into nitrate-(CNitrate is produced+CProduce nitrite)]+n*CProduce nitrite+DOInflow of fluidCalculating and determining a carbon source adding coefficient, wherein S is the adding amount of the carbon source and the unit is mg/LCOD; m is the carbon source adding coefficient for converting nitrate into nitrogen, and n is the carbon source adding coefficient for converting nitrate into nitrite; cInto nitrateFor the nitrate concentration, DO, of the influent water of the denitrification filterInflow of fluidThe DO concentration of the inflow of the denitrification filter is mg/L; according to the carbon source adding amount S set in the debugging period of the denitrification filter1、S2Actual operation data of 20mg/L and 30mg/L are respectively combined with a carbon source adding coefficient calculation formula simultaneous equation set to calculate and determine specific carbon source adding coefficients m and n of the denitrification filter to be 5.06 and 1.95 respectively;
c. and determining a carbon source adding flow calculation formula. The carbon source adding controller calculates the adding amount of the carbon source in real time to control the concentration C by using nitrate and nitrite in the effluent of the denitrification filterControlFor the calculation reference, the carbon source adding coefficient is the specific carbon source adding coefficient m, n calculated and determined by the simultaneous equation set in the debugging period of the denitrification filter, and on the basis, the real-time carbon source adding flow calculation formula q is determinedThrow-in＝QInflow water*{5.06*[CInto nitrate-(CNitrate is produced+CProduce nitrite) Control]+1.95*CProduce nitrite+DOInflow of fluid1440 ρ f 1, wherein q isThrow-inAdding flow rate for carbon source, wherein the unit is L/min; qInflow waterIs the water inflow of the denitrification filter tank, and the unit is m3D; rho is the density of the added carbon source, and the unit is g/L; f is the effective content of the carbon source; k is carbon source COD equivalent, the unit is gCOD/g carbon source, and k of carbon source acetic acid is 1;
d. and calculating the adding flow of the carbon source in real time. Denitrification filter intake water real-time nitrate concentration C measured by first online nitrate nitrogen instrument in real timeInto nitrateIs 11mgL, real-time nitrite concentration C of denitrification filter effluent measured by on-line nitrite meter in real timeProduce nitriteDenitrification filter inflow real-time DO concentration DO measured by online dissolved oxygen meter at 1mg/L in real timeInflow of fluid7mg/L are all used as input parameters to be transmitted to a carbon source adding controller in real time, and the adding flow q of the real-time carbon source required by the enhanced denitrification of the denitrification filter is calculated and determined according to a set determined carbon source adding flow calculation formulaThrow-in＝QInflow water*{5.06*[11-7]+1.95*1+7}/(1440*ρ*f*1)＝QInflow water *29.19/(1440*ρ*f*1)；
e. And the adding flow of the carbon source adding pump is regulated and controlled in real time. A carbon source adding controller adds the flow q according to the real-time carbon source required by the enhanced denitrification of the denitrification filterThrow-inAnd regulating and controlling the adding flow of the carbon source added to the carbon source mixing tank by the carbon source adding pump in real time according to the calculated result.
Example 3: the method comprises the following steps:
a. and setting parameters. The control concentration of nitrate and nitrite in the effluent of the denitrification filter is set as (C)Nitrate is produced +CProduce nitrite)ControlIn which C isNitrate is producedIs the concentration of nitrate in the effluent of the denitrification filter CProduce nitriteThe nitrite concentration of the effluent of the denitrification filter is controlled under the relatively severe local discharge standard (C)Nitrate is produced+CProduce nitrite)ControlIs 7 mg/L; setting carbon source adding quantity S for carbon source adding coefficient calculation in denitrification filter debugging period1、S230mg/L and 40mg/L respectively;
b. and (4) calculating the carbon source adding coefficient. Based on the formula S ═ m [ C ]Into nitrate-(CNitrate is produced+CProduce nitrite)]+n*CProduce nitrite+DOInflow of fluidCalculating and determining a carbon source adding coefficient, wherein S is the adding amount of the carbon source and the unit is mg/LCOD; m is the carbon source adding coefficient for converting nitrate into nitrogen, and n is the carbon source adding coefficient for converting nitrate into nitrite; cInto nitrateFor the nitrate concentration, DO, of the influent water of the denitrification filterInflow of fluidThe DO concentration of the inflow of the denitrification filter is mg/L; according to the denitrification filter tankCarbon source dosage S set in test period1、S2Actual operation data of 30mg/L and 40mg/L are respectively combined with a carbon source adding coefficient calculation formula simultaneous equation set to calculate and determine specific carbon source adding coefficients m and n of the denitrification filter to be 5.35 and 2.15 respectively;
c. and determining a carbon source adding flow calculation formula. The carbon source adding controller calculates the adding amount of the carbon source in real time to control the concentration C by using nitrate and nitrite in the effluent of the denitrification filterControlFor the calculation reference, the carbon source adding coefficient is the specific carbon source adding coefficient m, n calculated and determined by the simultaneous equation set in the debugging period of the denitrification filter, and on the basis, the real-time carbon source adding flow calculation formula q is determinedThrow-in＝QInflow water*{5.35*[CInto nitrate-(CNitrate is produced+CProduce nitrite) Control]+2.15*CProduce nitrite+DOInflow of fluid1440 ρ f 1, wherein q isThrow-inAdding flow rate for carbon source, wherein the unit is L/min; qInflow waterIs the water inflow of the denitrification filter tank, and the unit is m3D; rho is the density of the added carbon source, and the unit is g/L; f is the effective content of the carbon source; k is carbon source COD equivalent, the unit is gCOD/g carbon source, and k of carbon source acetic acid is 1;
d. and calculating the adding flow of the carbon source in real time. Denitrification filter intake water real-time nitrate concentration C measured by first online nitrate nitrogen instrument in real timeInto nitrate12mg/L denitrification filter effluent real-time nitrite concentration C measured by on-line nitrite meter in real timeProduce nitrite1.5mg/L denitrification filter inflow real-time DO concentration DO measured by online dissolved oxygen meter in real timeInflow of fluid7.5mg/L are all used as input parameters to be transmitted to a carbon source adding controller in real time, and the adding flow q of the real-time carbon source required by the enhanced denitrification of the denitrification filter is calculated and determined according to a set determined carbon source adding flow calculation formulaThrow-in＝QInflow water*{5.35*[12-7]+2.15*1.5+7.5}/(1440*ρ*f*1)＝QInflow water *37.48/(1440*ρ*f*1)；
e. And the adding flow of the carbon source adding pump is regulated and controlled in real time. A carbon source adding controller adds the flow q according to the real-time carbon source required by the enhanced denitrification of the denitrification filterThrow-inThe calculation result of (2) real-time regulation and control of carbon source feedingAdding the carbon source adding flow rate added into the carbon source mixing tank by the adding pump.
Claims (6)
1. A carbon source accurate feeding system of a denitrification filter comprises a water inlet pipe, a carbon source mixing tank, the denitrification filter, a denitrification filter water inlet pipe duct, a denitrification filter water outlet pipe duct and a carbon source feeding pump; the method is characterized in that: an inlet of the carbon source mixing tank is connected with a water inlet pipe, a denitrification filter water inlet pipe channel is connected between an outlet of the carbon source mixing tank and an inlet of the denitrification filter, and an outlet of the denitrification filter is connected with a denitrification filter water outlet pipe channel; the device comprises a water inlet pipe, a carbon source mixing tank, a denitrification filter, an on-line nitrite instrument, a first on-line nitrate instrument, a second on-line nitrate instrument, a first on-line dissolved oxygen instrument, a second on-line nitrite instrument, a second on-line dissolved oxygen instrument and a second on-line nitrite instrument are arranged on the water outlet pipe of the denitrification filter.
2. The accurate carbon source adding system for a denitrification filter according to claim 1, which is characterized in that: the online flowmeter, the first online nitrate meter, the online nitrite meter, the second online nitrate meter and the online dissolved oxygen meter are respectively connected with the input end of the carbon source adding controller, and the output end of the carbon source adding controller is connected with the carbon source adding pump.
3. The accurate carbon source adding system for a denitrification filter according to claim 1, which is characterized in that: the carbon source feeding pump is a variable frequency pump with combined large and small power.
4. The accurate carbon source adding system for a denitrification filter according to claim 1, which is characterized in that: and a test probe of the online dissolved oxygen meter is arranged in the denitrification filter tank, and is positioned 5-10 cm below the lowest operating liquid level of the downward flow denitrification filter tank or in a water distribution area of the upward flow denitrification filter tank.
5. The accurate carbon source adding system for a denitrification filter according to claim 1, which is characterized in that: and the carbon source feeding pump feeds the carbon source by adopting sodium acetate.
6. The accurate carbon source adding system for a denitrification filter according to claim 1, which is characterized in that: and the carbon source feeding pump feeds the carbon source by adopting acetic acid.
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