CN109110922B - Double-carbon source adding method and system for denitrification deep bed filter - Google Patents
Double-carbon source adding method and system for denitrification deep bed filter Download PDFInfo
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Abstract
The invention relates to a carbon source adding method for a denitrification filter, which is used for collectingQ, COD and NO of denitrification filter 3 ‑ 、NO 2 ‑ Concentration parameters comprising the steps of: the first step: determining a carbon source addition coefficient; cm=k min ～K max No x And a second step of: determination of carbon source addition types: when (Nin-Nc)/Nin > 0.81, q=k max (Nin-Nc). Q/1000/C; q is the addition amount of the carbon source, L/h; nin is the sum of nitrate nitrogen and nitrite nitrogen concentration of the incoming water, and mg/L; nc is an internal control emission index of the sum of nitrate nitrogen and nitrite nitrogen concentration, and mg/L; q is the incoming water flow, m3/h; c is the carbon source adding concentration; when (Nin-Nc)/Nin is less than or equal to 0.81, q=k min Nin.Q/1000/C. The invention also discloses a carbon source adding system of the denitrification filter. The carbon source adding method can quickly obtain more accurate carbon source adding amount control data, thereby obviously saving the medicament cost and the electric energy of the carbon source, improving the denitrification effect of the denitrification deep bed filter, saving the operation cost, avoiding the waste of the carbon source and saving the production cost.
Description
[ technical field ]
The invention relates to the technical field of sewage treatment, in particular to a double-carbon source adding method and a double-carbon source adding system for a denitrification deep bed filter.
[ background Art ]
The overall requirements of various watercourses in China on comprehensive water environment treatment are continuously improved, and the complete achievement of new standard discharge can not be ensured under the condition that a plurality of domestic sewage plants are not upgraded and modified at present, and particularly the standard discharge problem of TN is particularly outstanding. The C/N ratio of incoming water of a plurality of sewage plants is low, and the TN removal rate cannot be guaranteed. In order to ensure that the sewage plant reaches the standard and effectively control TN emission, an additional auxiliary addition of a carbon source is required to reduce nitrate nitrogen and nitrite nitrogen emissions, thereby reducing TN emissions.
The method for adding the carbon source is divided according to the position of the input point, and two modes are available: the anaerobic zone of the biochemical section is added, and the denitrification filter of the advanced treatment section is added.
The first adding mode is as follows: adding in anoxic zone of biochemical stage. In the biochemical treatment process section, the theoretical removal rate of the sewage TN is eta= (r+R)/(1+r+R). The appropriate reflux ratio may be determined based on the value of the incoming water TKN. When determining a suitable reflux ratio, TN is still not removed effectively, an additional addition of carbon source is considered. The advantage of adding carbon source in biochemical process section is: no additional structure is needed, and the process modification cost is low; the disadvantages are: the time from the adding point to the water outlet point is long, the water outlet index cannot be fed back in real time, a large amount of carbon sources and microorganisms form carbon adsorption, the carbon adsorption is not effectively utilized for denitrification, and the adding amount of the carbon sources can only be determined empirically, so that excessive adding of the carbon sources is often caused, the medicament cost is increased, and the biochemical sludge amount is increased.
The second feeding mode is as follows: and (5) adding the denitrification filter in the advanced treatment section. In the process of using the denitrification filter process for advanced sewage treatment, most of carbon sources (organic matters) in sewage entering an advanced treatment stage are removed as the sewage is treated by a front-stage process, and the carbon sources can be supplemented according to various indexes of the incoming water. The method has obviously reduced carbon source addition compared with the first method, but COD and NO are not fully considered in many denitrification processes 3 - 、NO 2 - The influence of pH, T, DO, ORP on the real-time addition of the carbon source is still high, so that the addition amount of the carbon source is still high.
Therefore, in order to improve the economy of carbon source addition, a more accurate carbon source addition method for the denitrification filter is provided, and the production and operation cost can be effectively saved.
[ summary of the invention ]
In order to solve the problem of economic and effective carbon source addition, the invention provides a double carbon source addition method and a double carbon source addition system for a denitrification deep bed filter tank, which realize accurate carbon source addition.
The invention adopts the following technical scheme that a carbon source adding method of a denitrification filter is adopted to collect Q, COD and NO of the denitrification filter 3 - 、NO 2 - pH, T, DO, ORP concentration parameters according to the collected ginsengAnd calculating the carbon source addition amount. The method comprises the following steps:
the first step: and determining the carbon source addition quantity coefficient.
Selecting a carbon source, and measuring the carbon source addition amount required by the complete reaction:
Cm＝K min ～K max No x in the following
Cm is the amount of carbon source which is required to be added, and mg/L;
No x mg/L is the sum of initial nitrate nitrogen and nitrite nitrogen concentration;
K min is No. 1 x - The lower coefficient of the carbon source consumed by the complete reaction;
K max is No. 1 x - The upper limit coefficient of the carbon source is consumed by the complete reaction.
Wherein the lower limit coefficient K min From the inorganic chemical reaction equation, the upper limit coefficient K is known max According to the biochemical reaction equation, the biochemical reaction is different in reaction direction according to different conditions, and the upper limit coefficient can be adjusted in different magnitudes according to different carbon source types and different sewage properties.
And a second step of: determination of carbon source addition types:
when (Nin-Nc)/Nin > 0.81,
q＝K max ·(Nin-Nc)·Q/1000/C；
q is the addition amount of the carbon source, L/h;
nin-the sum of nitrate nitrogen and nitrite nitrogen concentration of the incoming water, mg/L;
nc-the internal control emission index of the sum of nitrate nitrogen and nitrite nitrogen concentration, mg/L;
q is water flow, m3/h;
c is the carbon source adding concentration;
when (Nin-Nc)/Nin is less than or equal to 0.81,
q＝K min ·Nin·Q/1000/C；
pH value, output NO 3 - 、NO 2 - Concentration and Q, NO 3 - 、NO 2 - Added to obtainN in Judging pH value and eta= (N) in -N c )/N in Is a numerical value of (2);
when pH is more than or equal to 7 and less than or equal to 8 and eta is more than 0.81, double carbon sources are added simultaneously (the molar ratio of the double carbon sources is n:1-n,0 < n < 1)
q 1 ＝n K1 max ·(N in -N c )·Q/1000/C 1 ⑴
q 2 ＝(1-n)K2 max ·(N in -N c )·Q/1000/C 2 ⑵
When the pH value is more than or equal to 7 and less than or equal to 8 and eta is less than or equal to 0.81, double carbon sources are added simultaneously (the molar ratio of the double carbon sources is n:1-n,0 < n < 1)
q 1 ＝n K1 min ·N in ·Q/1000/C 1 ⑶
q 2 ＝(1-n)K2 min ·N in ·Q/1000/C 2 ⑷
When the pH is less than 7 and eta is more than 0.81, only sodium acetate is added
q 2 ＝K2 max ·(N in -N c )·Q/1000/C 2 ⑸
When the pH is less than 7 and eta is less than or equal to 0.81, only sodium acetate is added
q 2 ＝K2 min ·N in ·Q/1000/C 2 ⑹
When the pH is more than 7 and eta is more than 0.81, only acetic acid is added
q 1 ＝K1 max ·(N in -N c )·Q/1000/C 2 ⑺
When the pH is more than 7 and eta is less than or equal to 0.81, only acetic acid is added
q 1 ＝K1 min ·N in ·Q/1000/C 2 ⑻。
Further, the method also comprises feedback and adjustment of the non-optimal running state of the system:
when ORP is less than or equal to-50 mV, the system operates normally; when ORP is > -50mV, the hydraulic retention time of the denitrification filter is increased by 10 minutes through adjusting a valve, carbon source addition adjustment is not needed, and the feedback of the central control chamber is performed, so that the aeration of the biochemical section is seriously excessive.
The operating temperature T of the denitrification filter is 0-65 ℃, the optimal operating temperature T is 10-30 ℃, if water temperature abnormality occurs, a T thermometer in the stirring tank judges whether the denitrification filter is in an optimal operating temperature state, if the denitrification filter is not in an optimal state, the hydraulic retention time of the denitrification filter is increased by 10 minutes through adjusting a valve, carbon source adding adjustment is not needed, a central control room is fed back, and abnormal water flow possibly enters the system.
Detecting the nitrate nitrogen value of water, wherein the value is more than or equal to 0.5, and the system operates normally; when the value is less than 0.5, this stage No x Substantially reduce to N 2 Very little cell mass (C) 5 H 7 NO 2 ) Carbon source addition coefficient K1 min 、K1 max 、K2 min 、K2 max Every 1 hour interval, the reduction is 5%, and at most 20%, until the system is restored to the optimal running state.
Detecting the value of nitrite nitrogen in water, wherein the value is less than or equal to 0.2, and the system operates normally; when the value is > 0.2, this stage No is explained x Reduction to N 2 The quantity is reduced, the denitrifying bacteria are greatly propagated, and the number of No is great x Production of cellular Material (C) 5 H 7 NO 2 ) Carbon source addition coefficient K1 min 、K1 max 、K2 min 、K2 max Every 1 hour, the rise is 5%, and the rise is 25% at most, until the system is restored to the optimal running state.
Numerical value COD of inflow COD i Numerical value COD of effluent COD O Determination of COD x ＝COD O -COD i When COD x Less than or equal to 0, and the system operates normally; when 0 < COD x Less than 2, the denitrification time of the denitrification filter is insufficient, the hydraulic retention time is increased by 10 minutes, and the carbon source is not required to be added and regulated; when COD x And the carbon source addition is more than or equal to 2, which indicates that the carbon source addition is seriously excessive.
Further, the external carbon source comprises: one or more of methanol, acetic acid, sodium acetate, propionic acid, butyric acid, and glucose.
The invention also discloses a carbon source adding system of the denitrification filter, which comprises an electromagnetic flowmeter arranged at a water inlet, a first COD analyzer, a first nitrate nitrogen analyzer, an acetic acid adding metering pump and a sodium acetate adding metering pump which are sequentially arranged behind the electromagnetic flowmeter, wherein the acetic acid adding metering pump and the sodium acetate adding metering pump are respectively correspondingly connected with an acetic acid storage tank and a sodium acetate storage tank;
the sodium acetate is added into a metering pump and then connected with a stirring tank;
the stirring tank is connected with a denitrification filter, and a second COD analyzer and a second nitrate nitrogen analyzer are arranged between the denitrification filter and the water outlet;
the PLC control system is connected with the electromagnetic flowmeter, the first COD analyzer, the first nitrate nitrogen analyzer, the acetic acid dosing metering pump, the sodium acetate dosing metering pump, the ORP meter, the T thermometer, the pH meter, the second COD analyzer and the second nitrate nitrogen analyzer.
Further, the device also comprises a pipeline mixer, and the sodium acetate is connected with the stirring pool through the pipeline mixer after being added into the metering pump.
Further, an ORP meter, a T thermometer and a pH meter are arranged on the stirring tank.
The invention has the beneficial effects that: the carbon source adding method can quickly obtain more accurate carbon source adding amount control data, thereby obviously saving the medicament cost and the electric energy of the carbon source, improving the denitrification effect of the denitrification deep bed filter, saving the operation cost, avoiding the waste of the carbon source and saving the production cost.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a dual carbon source feeding system of a denitrification deep bed filter in the present embodiment.
In the figure: the system comprises an electromagnetic flowmeter 1, a COD analyzer (water inflow), a nitrate nitrogen analyzer (water inflow), an acetic acid storage tank 4, a sodium acetate storage tank 5, an acetic acid dosing metering pump 6, a sodium acetate dosing metering pump 7, a pipeline mixer 8, a stirring tank 9, an ORP meter 10, a T thermometer 11, a pH meter 12, a denitrification filter 13, a COD analyzer (water outflow) 14, a nitrate nitrogen analyzer (water outflow) 15 and a PLC control system 16.
Detailed description of the preferred embodiments
The present invention will be further described with reference to examples and drawings for the purpose of facilitating understanding to those skilled in the art.
Collecting Q, COD and NO of denitrification filter 3 - 、NO 2 - And pH, T, DO, ORP meter parameters are provided for a central control system, and the central control system sends control signals to the dosing metering pump according to the parameters. And the central control system accurately calculates the carbon source adding amount.
The first step: and determining the carbon source addition quantity coefficient.
The addition amount of the carbon source is convenient to calculate, methanol is firstly used as an external carbon source, and the reaction mode has three possibilities:
first, NO 3 - 、NO 2 - 、CH 3 OH is totally decomposed into inorganic substances:
NO 3 - +0.833CH 3 OH→0.833CO 2 +0.5N 2 +1.167H 2 O+OH -
NO 2 - +0.5CH 3 OH→0.5CO 2 +0.5N 2 +0.5H 2 O+OH -
O 2 +0.667CH 3 OH→0.667CO 2 +1.333H 2 O
0.833×32÷14＝1.90；0.5×32÷14＝1.14；0.667×32÷32＝0.667；
cm=1.90no+1.14n+0.667d, where
Cm-the amount of methanol to be added, mg/L;
no-initial nitrate nitrogen concentration, mg/L;
n-initial nitrite nitrogen concentration, mg/L;
d-initial dissolved oxygen concentration, mg/L.
Second, NO 3 - 、NO 2 - 、CH 3 OH is decomposed and simultaneously, cell material (C) of denitrifying bacteria is synthesized 5 H 7 NO 2 )：
NO 3 - +1.08CH 3 OH+0.24H 2 CO 3 →0.056C 5 H 7 NO 2 +0.47N 2 +1.68H 2 O+HCO 3 -
NO 2 - +0.67CH 3 OH+0.53H 2 CO 3 →0.04C 5 H 7 NO 2 +0.48N 2 +1.23H 2 O+HCO 3 -
O 2 +0.93CH 3 OH+0.056NO 3 - →0.056C 5 H 7 NO 2 +1.64H 2 O+0.59H 2 CO 3 +0.056HCO 3 -
1.08×32÷14＝2.47；0.67×32÷14＝1.53；0.93-0.056×1.08×32÷32＝0.87；
Cm＝2.47No+1.53N+0.87D。
Thirdly, excessive carbon source is added, and can be absorbed and accumulated by bacteria excessively, so that ineffective consumption of the carbon source is formed, the adding amount is controlled, and the process is forbidden.
In the embodiment, aiming at the deep-bed denitrification filter with short-time hydraulic retention, the incoming water is the effluent of the secondary sedimentation tank, and even the effluent after the high-efficiency sedimentation tank. The DO value of the effluent is lower, and the carbon source consumed by DO accounts for less than 2 percent of the total carbon source (if DO is ignored, the actual adding amount of the carbon source needs to be slightly increased); effluent NO 2 - The value is also not high, equivalent to NO 2 - The amount of carbon source consumed is less than NO 3 - Amount of carbon source consumed (if NO is to be added 2 - The values are combined to NO 3 - The actual addition amount of the carbon source needs to be slightly reduced, and in summary, the addition amount of the methanol can be approximately expressed as:
Cm＝1.9～2.47No x in the following
Cm-the amount of methanol to be added, mg/L;
No x -the sum of the initial nitrate nitrogen and nitrite nitrogen concentrations, mg/L;
1.9——No x - the lower coefficient of methanol consumption for complete reaction;
2.47——No x - the complete reaction consumes the upper coefficient of methanol.
Similar calculation
Acetic acid is taken as an external carbon source, and the addition amount is approximately expressed as follows: cm=2.68 to 3.3No x (2.68 is the lower limit coefficient of acetic acid consumption, and 3.3 is the upper limit coefficient of acetic acid consumption);
sodium acetate is taken as an external carbon source, and the addition amount is approximately expressed as follows: cm=3.66 to 4.51No x (3.66 is the lower limit coefficient of sodium acetate consumption, and 4.51 is the upper limit coefficient of sodium acetate consumption).
And a second step of: determination of carbon source addition types:
common carbon sources for municipal sewage plants are: methanol, acetic acid, propionic acid, butyric acid, glucose.
1. Different carbon source pair No x Time required for complete denitrification of N:
| type of carbon source | Methanol | Acetic acid | Propionic acid | Butyric acid | Glucose |
| Complete denitrification time (min) | 25 | 25 | 32 | 40 | 75 |
2. The time required for domesticating the strain by the carbon source is as follows:
| type of carbon source | Methanol | Acetic acid | Propionic acid | Butyric acid | Glucose |
| Time of strain acclimation (d) | 29 | 14 | 14 | 15 | 23 |
The invention requires that the water conservancy residence time of the denitrification deep bed filter is 30min, the strain domestication time is 15d, and the carbon source is selected from acetic acid and sodium acetate.
According to different carbon source selection, the lower limit and the upper limit coefficient of carbon source addition are respectively determined as K min 、K max (the coefficients can be invoked directly in the PLC control system).
Adding carbon source with acetic acid, coefficient K1 min ＝2.68、K1 max =3.3, e.g. as sodium acetate, coefficient K2 min ＝3.66、K2 max ＝4.51。
Determining the accurate addition amount:
when (N) in -N c )/N in At a time of > 0.81 to the total number of the cells,
q 1 ＝K1 max ·(N in -N c )·Q/1000/C 1 ；
or alternatively
q 2 ＝K2 max ·(N in -N c )·Q/1000/C 2 ；
Or adding two carbon sources simultaneously (molar ratio of sodium acetate to sodium acetate 1:3)
q 1 ＝0.25K1 max ·(N in -N c )·Q/1000/C 1 ，q 2 ＝0.75K2 max ·(N in -N c )·Q/1000/C 2 。
q 1 Acetic acid addition amount, L/h;
q 2 the adding amount of sodium acetate is L/h;
N in -total nitrate nitrogen concentration of water and nitrite nitrogen concentration, mg/L;
N c -an internal control emission index of the sum of nitrate nitrogen and nitrite nitrogen concentration, mg/L;
q-flow of water, m 3 /h；
C 1 Acetic acid addition concentration,%;
C 2 sodium acetate concentration,%.
When (N) in -N c )/N in When the temperature is less than or equal to 0.81,
q 1 ＝K1 min ·N in ·Q/1000/C 1 ；
or alternatively
q 2 ＝K2 min ·N in ·Q/1000/C 2 ；
Or adding two carbon sources simultaneously (molar ratio of sodium acetate to sodium acetate 1:3)
q 1 ＝0.25K1 min ·N in ·Q/1000/C 1 ，q 2 ＝0.75K2 min ·N in ·Q/1000/C 2 。
Aiming at the deep-bed denitrification filter with short-time hydraulic retention, the embodiment of the invention uses the water coming from the secondary sedimentation tank, and even uses the water coming from the high-efficiency sedimentation tank.
As shown in fig. 1, the double-carbon source feeding system of the denitrification deep bed filter comprises an electromagnetic flowmeter 1, a COD analyzer (water inflow) 2, a nitrate nitrogen analyzer (water inflow) 3, an acetic acid storage tank 4, a sodium acetate storage tank 5, an acetic acid feeding metering pump 6, a sodium acetate feeding metering pump 7, a pipeline mixer 8, a stirring tank 9, an ORP meter 10, a T thermometer 11, a pH meter 12, a denitrification filter 13, a COD analyzer (water outflow) 14, a nitrate nitrogen analyzer (water outflow) 15 and a PLC control system 16.
Firstly, inoculating and domesticating strains, wherein the process is carried out in a deep-bed denitrification filter cell. If the sewage plant is newly built, the addition product strain or other sewage plant surplus sludge can be directly put into the sewage plant as an access strain; if the sewage plant is upgraded and reformed, the strain of an addition product or the sludge in the middle section of the anoxic section of the sewage plant can be directly added as an access strain (if the sewage plant is a CASS or SBR technology, the sewage plant can be inoculated with sludge at the bottom of the biochemical tank 1 hour after aeration and precipitation of the biochemical tank are stopped). The strain domestication is based on the principle of small amount of water inflow in the initial stage and gradual increase until stable operation. When the strain is domesticated, tap water or treated sewage before disinfection can be used as a water source to prepare the nutrient solution. The concentration of the nutrient solution is controlled as follows: CH (CH) 3 COONa(180mg/l)、KNO 3 (40mg/l)、MgSO 4 (18mg/l)、CaCl 2 (4mg/l)、KH 2 PO 4 (3mg/l)、FeCl 3 (1mg/l)、KI(0.4mg/l)、MnSO 4 (0.1mg/l)、H 3 BO 3 (0.1mg/l)、CoCl 2 (on demand), cuSO 4 (on demand), znSO 4 (as needed). After the debugging is stable and the strain domestication is finished, the backwash water of the debugging unit cell can be used as a finished strain to be directly connected into other unit cells for use until the debugging of all unit cells is finished.
After the system is debugged, the carbon source adding and running control method comprises the following steps:
1. setting N in the PLC control system 14 c (internal control emission index of total concentration of nitrate nitrogen and nitrite nitrogen, mg/L), C 1 (acetic acid addition concentration, active ingredient%), C 2 (sodium acetate addition concentration, active ingredient%), K1 min =2.68 (lower limit coefficient of acetic acid consumption), K1 max =3.3 (upper limit coefficient of acetic acid consumption), K2 min =3.66 (lower limit coefficient of sodium acetate consumption))、K2 max =4.51 (upper limit coefficient of sodium acetate consumption).
2. In the test run stage, the nitrate nitrogen analyzer (water inflow) 3 outputs No (initial nitrate nitrogen concentration, mg/L), N (initial nitrite nitrogen concentration, mg/L) and the electromagnetic flowmeter 1 outputs Q (water inflow, m 3 And/h) is given to the PLC control system 16, and the PLC control system 16 adds up the values of N according to the input No and N to obtain N in (total nitrate nitrogen and nitrite nitrogen concentration of the water, mg/L), and determining η= (N) in -N c )/N in Is calculated according to the following formula. Simultaneously starting an acetic acid feeding metering pump 6 and a sodium acetate feeding metering pump 7 according to the flow rate q respectively 1 、q 2 Adding carbon source, adding data q into acetic acid adding metering pump 6 1 Dosing data q of sodium acetate dosing metering pump 7 2 The real-time feedback PLC control system 16 is recorded as historical data.
The first adding mode is as follows:
when eta is more than 0.81, the double carbon sources are simultaneously added (the molar ratio of the sodium acetate to the sodium acetate is 1:3)
q 1 ＝0.25K1 max ·(N in -N c )·Q/1000/C 1 ⑴
q 2 ＝0.75K2 max ·(N in -N c )·Q/1000/C 2 ⑵
q 1 Acetic acid addition amount, L/h;
q 2 the adding amount of sodium acetate is L/h;
N in -total nitrate nitrogen concentration of water and nitrite nitrogen concentration, mg/L;
N c -an internal control emission index of the sum of nitrate nitrogen and nitrite nitrogen concentration, mg/L;
q-flow of water, m 3 /h；
C 1 Acetic acid adding concentration and active ingredients;
C 2 sodium acetate is added to the mixture to obtain the concentration and the active ingredient;
K1 min =2.68—lower acetate consumption coefficient;
K1 max ＝33-consumption acetic acid upper limit coefficient;
K2 min =3.66—consumption sodium acetate lower limit coefficient;
K2 max =4.51—consumption sodium acetate upper limit coefficient.
And a second adding mode is as follows:
when eta is less than or equal to 0.81, simultaneously adding two carbon sources (the molar ratio of the sodium acetate to the sodium acetate is 1:3)
q 1 ＝0.25K1 min ·N in ·Q/1000/C 1 ⑶
q 2 ＝0.75K2 min ·N in ·Q/1000/C 2 ⑷
3. In the final operation stage, the pH meter 12 outputs pH value, the nitrate nitrogen analyzer (water inflow) 3 outputs No (initial nitrate nitrogen concentration, mg/L), N (initial nitrite nitrogen concentration, mg/L) and the electromagnetic flowmeter 1 outputs Q (water inflow, m) 3 And/h) is given to the PLC control system 16, and the PLC control system 16 adds up the values of N according to the input No and N to obtain N in (total nitrate nitrogen and nitrite nitrogen concentration of the water, mg/L), and judging the pH value and eta= (N) in -N c )/N in Is calculated according to the following formula. Simultaneously starting an acetic acid feeding metering pump 6 and a sodium acetate feeding metering pump 7 according to the flow rate q respectively 1 、q 2 Adding carbon source, adding data q into acetic acid adding metering pump 6 1 Dosing data q of sodium acetate dosing metering pump 7 2 The real-time feedback PLC control system 16 is recorded as historical data.
The first adding mode is as follows:
when the pH value is more than or equal to 7 and less than or equal to 8 and eta is more than 0.81, double carbon sources are simultaneously added (the molar ratio of the sodium acetate is 1:3)
q 1 ＝0.25K1 max ·(N in -N c )·Q/1000/C 1 ⑴
q 2 ＝0.75K2 max ·(N in -N c )·Q/1000/C 2 ⑵
And a second adding mode is as follows:
when the pH value is more than or equal to 7 and less than or equal to 8 and eta is less than or equal to 0.81, double carbon sources are simultaneously added (the molar ratio of the sodium acetate is 1:3)
q 1 ＝0.25K1 min ·N in ·Q/1000/C 1 ⑶
q 2 ＝0.75K2 min ·N in ·Q/1000/C 2 ⑷
And the adding mode is three:
when the pH is less than 7 and eta is more than 0.81, only sodium acetate (alkaline carbon source) is added
q 2 ＝K2 max ·(N in -N c )·Q/1000/C 2 ⑸
And the adding mode is four:
when the pH is less than 7 and eta is less than or equal to 0.81, only sodium acetate is added
q 2 ＝K2 min ·N in ·Q/1000/C 2 ⑹
Fifth mode of addition:
when the pH is more than 7 and eta is more than 0.81, only acetic acid (acid carbon source) is added
q 1 ＝K1 max ·(N in -N c )·Q/1000/C 2 ⑺
The adding mode is six:
when the pH is more than 7 and eta is less than or equal to 0.81, only acetic acid is added
q 1 ＝K1 min ·N in ·Q/1000/C 2 ⑻
4. And feeding back and adjusting the non-optimal running state of the system.
4.1, since DO meters are not ORP meter sensitive and accurate, the present invention uses ORP meter 10 (mounted at the outlet end of the stirred tank) in stirred tank 9 to numerically reflect anoxic conditions. When ORP is less than or equal to-50 mV, the system operates normally; when ORP > -50mV, the hydraulic retention time of the denitrification filter 13 is increased by 10 minutes through adjusting a valve, carbon source addition adjustment is not needed, and the feedback of a central control chamber is performed, so that the aeration of the biochemical section is seriously excessive.
4.2, the operating temperature T of the denitrification filter 13 is 0-65 ℃, the optimal operating temperature T is 10-30 ℃, and the water temperature of a normal municipal sewage plant in four seasons can be kept at 5-26 ℃. Under normal conditions, the water-cooled denitrification filter can operate in an optimal or near-optimal state, if water temperature abnormality occurs, a T thermometer 11 in a stirring tank 9 judges whether the water-cooled denitrification filter is in an optimal operation temperature state, if the water temperature abnormality does not occur in the optimal operation temperature state, the hydraulic retention time of the denitrification filter 13 is increased by 10 minutes through adjusting a valve, carbon source addition adjustment is not needed, a central control room is fed back, and abnormal water flow possibly enters the system.
4.3, detecting the nitrate nitrogen value of water by a nitrate nitrogen analyzer (effluent) 15, wherein the value is more than or equal to 0.5, and the system operates normally; when the value is less than 0.5 (which is most likely due to the long-term operation of the system without back flushing), this stage No x Substantially reduce to N 2 Very little cell mass (C) 5 H 7 NO 2 ) Carbon source addition coefficient K1 min 、K1 max 、K2 min 、K2 max Every 1 hour, the reduction is 5% and at most 20%, and only the system is restored to the optimal running state.
4.4, detecting the nitrite nitrogen value of the water by a nitrate nitrogen analyzer (effluent) 15, wherein the value is less than or equal to 0.2, and the system operates normally; when the value is > 0.2 (which is most common in the early stage of the long back flushing of the system), this stage No is explained x Reduction to N 2 The quantity is reduced, the denitrifying bacteria are greatly propagated, and the number of No is great x Production of cellular Material (C) 5 H 7 NO 2 ) Carbon source addition coefficient K1 min 、K1 max 、K2 min 、K2 max Every 1 hour, the rise is 5%, at most 25%, only until the system is restored to the optimal operating state.
4.5 outputting the numerical value COD by a COD analyzer (inflow water) 2 i COD analyzer (effluent) 14 outputs a numerical value COD O For the PLC control system 16, the PLC control system 16 outputs the COD to the computer according to the input COD i COD and its preparation method O Determination of COD x ＝COD O -COD i When COD x Less than or equal to 0, and the system operates normally; when 0 < COD x Less than 2, the denitrification time of the denitrification filter 13 is insufficient, the hydraulic retention time is increased by 10 minutes, and the carbon source is not required to be added and regulated; when COD x And (2) is not less than 2, which indicates that the carbon source is added in serious excess, and the accuracy of the output value and the real flow of the acetic acid adding metering pump 6 and the sodium acetate adding metering pump 7 is checked.
The above embodiment only uses acetic acid and sodium acetate as dual carbon sources to illustrate the technical idea of the invention, but the scope of the invention is not limited thereby, and any modification made on the basis of the technical scheme according to the technical idea (including other carbon source combinations) provided by the invention falls within the scope of the invention. The technology not related to the invention can be realized by the prior art.
Claims (7)
1. A double carbon source adding method for a denitrification deep bed filter pool collects Q, COD and NO of the denitrification filter pool 3 - 、NO 2 - Concentration parameters comprising the steps of:
the first step: determining a carbon source addition coefficient;
selecting a carbon source, and measuring the carbon source addition amount required by the complete reaction:
Cm=K min ~ K max No x in the following
Cm is the amount of carbon source which is required to be added, and mg/L;
No x mg/L is the sum of initial nitrate nitrogen and nitrite nitrogen concentration;
K min is No. 1 x - The lower limit coefficient of the carbon source consumed by the complete reaction is calculated according to the inorganic chemical reaction;
K max is No. 1 x - The upper limit coefficient of the carbon source consumed by the complete reaction is calculated according to the biochemical reaction;
and a second step of: determination of carbon source addition types:
when (Nin-Nc)/Nin > 0.81,
q= K max ·(Nin-Nc)·Q/1000/C；
q is the addition amount of the carbon source, L/h;
nin is the sum of nitrate nitrogen and nitrite nitrogen concentration of the incoming water, and mg/L;
nc is an internal control emission index of the sum of nitrate nitrogen and nitrite nitrogen concentration, and mg/L;
q is the incoming water flow, m3/h;
c is the carbon source adding concentration;
when (Nin-Nc)/Nin is less than or equal to 0.81,
q= K min ·Nin·Q/1000/C；
the molar ratio of the two carbon sources is n 1-n, and n is more than 0 and less than 1;
when (N) in -N c )/ N in At a time of > 0.81 to the total number of the cells,
q 1 = K1 max ·(N in -N c )·Q/1000/C 1 ；
or alternatively
q 2 = K2 max ·(N in -N c )·Q/1000/C 2 ；
Or adding two carbon sources at the same time according to
q 1 =n K1 max ·(N in -N c )·Q/1000/C 1 ，q 2 =(1-n) K2 max ·(N in -N c )·Q/1000/C 2；
q 1 、q 2 The addition amounts of the two carbon sources are respectively;
N in the total nitrate nitrogen concentration of the incoming water is the total nitrate nitrogen concentration;
N c an internal control emission index which is the sum of nitrate nitrogen and nitrite nitrogen concentration;
q is the incoming water flow;
C 1 、C 2 respectively adding two carbon sources;
when (N) in -N c )/ N in When the temperature is less than or equal to 0.81,
q 1 = K1 min ·N in ·Q/1000/C 1 ；
or alternatively, the process may be performed,
q 2 = K2 min ·N in ·Q/1000/C 2 ；
or adding the two carbon sources simultaneously:
q 1 =n K1 min ·N in ·Q/1000/C 1 ，q 2 =(1-n) K2 min ·N in ·Q/1000/C 2 。
2. the denitrification deep bed filter double carbon source adding method according to claim 1, which is characterized in that:
collecting the pH value of the denitrification filter,NO 3 - 、NO 2 - Concentration, NO 3 - 、NO 2 - Added to obtain N in Judging pH value and eta= (N) in -N c )/ N in Is a numerical value of (2);
determining two externally-added carbon sources, wherein the molar ratio of the carbon sources is n, namely 1-n, and n is more than 0 and less than 1;
when the pH value is more than or equal to 7 and less than or equal to 8 and eta is more than 0.81, simultaneously adding the two carbon sources:
q 1 =n K1 max ·(N in -N c )·Q/1000/C 1 ⑴
q 2 =(1-n) K2 max ·(N in -N c )·Q/1000/C 2 ⑵
when the pH value is more than or equal to 7 and less than or equal to 8 and eta is less than or equal to 0.81, simultaneously adding the two carbon sources:
q 1 =n K1 min ·N in ·Q/1000/C 1 ⑶
q 2 =(1-n) K2 min ·N in ·Q/1000/C 2 ⑷
when the pH is less than 7 and eta is more than 0.81, only alkaline carbon source is added
q 2 = K2 max ·(N in -N c )·Q/1000/C 2 ⑸
When the pH is less than 7 and eta is less than or equal to 0.81, only alkaline carbon source is added
q 2 = K2 min ·N in ·Q/1000/C 2 ⑹
When the pH is more than 7 and eta is more than 0.81, only the acid carbon source is added
q 1 = K1 max ·(N in -N c )·Q/1000/C 2 ⑺
When the pH is more than 7 and eta is less than or equal to 0.81, only the acid carbon source is added
q 1 = K1 min ·N in ·Q/1000/C 2 ⑻。
3. The denitrification deep bed filter double carbon source adding method according to claim 2, which is characterized in that:
and the method also comprises feedback and adjustment of the non-optimal running state of the system:
when ORP is less than or equal to-50 mV, the system operates normally; when ORP > -50mV, the hydraulic retention time of the denitrification filter is increased by 10 minutes by adjusting a valve;
if the water temperature is abnormal and exceeds the range of 10-30 ℃, the hydraulic retention time of the denitrification filter tank is increased by 10 minutes through adjusting a valve;
detecting the nitrate nitrogen value of water, wherein the value is more than or equal to 0.5, and the system operates normally; when the numerical value is less than 0.5, the carbon source addition coefficient K1 min 、K1 max 、K2 min 、K2 max Every 1 hour, the reduction is 5% and at most 20% until the system is restored to the optimal running state;
detecting the value of nitrite nitrogen in water, wherein the value is less than or equal to 0.2, and the system operates normally; when the numerical value is more than 0.2, the carbon source addition coefficient K1 min 、K1 max 、K2 min 、K2 max Every 1 hour, the rise is 5 percent, the rise is 25 percent at most, and the system is restored to the optimal running state;
numerical value COD of inflow COD i Numerical value COD of effluent COD O Determination of COD x = COD O - COD i When COD x Less than or equal to 0, and the system operates normally; when 0 < COD x The hydraulic retention time is increased by 10 minutes less than 2, and the addition and adjustment of a carbon source are not needed; when COD
x And the carbon source addition is more than or equal to 2, which indicates that the carbon source addition is seriously excessive.
4. The method for adding the double carbon sources into the denitrification deep bed filter according to claim 2 or 3, which is characterized in that:
the carbon source includes: methanol, acetic acid, sodium acetate, propionic acid, butyric acid, glucose, or a combination of two or more thereof.
5. A system using the denitrification deep bed filter double carbon source addition method according to any one of claims 1 to 4, characterized in that:
the device comprises an electromagnetic flowmeter arranged at a water inlet, a first COD analyzer, a first nitrate nitrogen analyzer, an acetic acid dosing metering pump and a sodium acetate dosing metering pump which are sequentially arranged behind the electromagnetic flowmeter, wherein the acetic acid dosing metering pump and the sodium acetate dosing metering pump are respectively correspondingly connected with an acetic acid storage tank and a sodium acetate storage tank;
the sodium acetate is added into a metering pump and then connected with a stirring tank;
the stirring tank is connected with a denitrification filter, and a second COD analyzer and a second nitrate nitrogen analyzer are arranged between the denitrification filter and the water outlet;
the PLC control system is connected with the electromagnetic flowmeter, the first COD analyzer, the first nitrate nitrogen analyzer, the acetic acid dosing metering pump, the sodium acetate dosing metering pump, the ORP meter, the T thermometer, the pH meter, the second COD analyzer and the second nitrate nitrogen analyzer.
6. The denitrification filter carbon source adding system according to claim 5, wherein: and the sodium acetate is added into the metering pump and then connected with the stirring pool through the pipeline mixer.
7. The denitrification filter carbon source adding system according to claim 5, wherein: an ORP meter, a T thermometer and a pH meter are arranged on the stirring tank.
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| CN111039399A (en) * | 2019-01-09 | 2020-04-21 | 深圳市长隆科技有限公司 | Formula and preparation method of composite carbon source for sewage denitrification |
| CN111072131B (en) * | 2019-12-31 | 2021-12-07 | 上海昊沧系统控制技术有限责任公司 | Method for calculating carbon source adding amount on line based on carbon-nitrogen ratio of inlet water |
| CN111410304B (en) * | 2020-03-30 | 2022-07-01 | 中国市政工程华北设计研究总院有限公司 | Method for realizing rapid start denitrification in low-temperature period of deep bed filter |
| CN111960533A (en) * | 2020-06-02 | 2020-11-20 | 西安热工研究院有限公司 | Novel carbon source adding optimization control device and method |
| CN111943354B (en) * | 2020-07-16 | 2021-05-28 | 深圳市清泉水业股份有限公司 | Carbon source adding method and system for denitrification filter tank system |
| CN112794443B (en) * | 2020-12-23 | 2022-10-21 | 联合环境技术(天津)有限公司 | Method for realizing biological denitrification and carbon source consumption reduction by optimizing carbon source dosage |
| CN113307365B (en) * | 2021-06-18 | 2023-03-21 | 清华苏州环境创新研究院 | Device and method for automatically determining optimal adding ratio and continuous adding stabilization time of denitrification carbon source |
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