CN109110922A - A kind of double carbon source addition methods of denitrification deep-bed filter and system - Google Patents
A kind of double carbon source addition methods of denitrification deep-bed filter and system Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 41
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims abstract description 25
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 117
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 48
- 239000001632 sodium acetate Substances 0.000 claims description 48
- 235000017281 sodium acetate Nutrition 0.000 claims description 47
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 12
- 230000014759 maintenance of location Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 229910002651 NO3 Inorganic materials 0.000 claims description 9
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 239000008103 glucose Substances 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 3
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 3
- 235000019260 propionic acid Nutrition 0.000 claims description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000003814 drug Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 description 13
- 230000009977 dual effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 230000001413 cellular effect Effects 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- -1 Methanol Acetic acid Propionic acid Butyric acid Chemical compound 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229910021580 Cobalt(II) chloride Inorganic materials 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000007836 KH2PO4 Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 239000011686 zinc sulphate Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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]
-
- 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
-
- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
- C02F2209/15—N03-N
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
A kind of denitrification filter pool carbon source addition method of the invention, acquires Q, COD, NO of denitrification filter pool3 ‑、NO2 ‑Concentration parameter includes the following steps: step 1: carbon source adds coefficient of discharge determination；Cm=Kmin~KmaxNox, step 2: carbon source adds the determination of type: as (Nin-Nc)/Nin > 0.81, q=Kmax·(Nin-Nc)·Q/1000/C；Q is carbon source dosage, L/h；Nin is the nitrate nitrogen and nitrite nitrogen concentration summation of water, mg/L；Nc is the internal control discharge index of nitrate nitrogen and nitrite nitrogen concentration summation, mg/L；Q is to carry out water flow, m3/h；C is that carbon source adds concentration；As (Nin-Nc)/Nin≤0.81, q=Kmin·Nin·Q/1000/C.Invention additionally discloses a kind of denitrification filter pool carbon source dosing systems.Carbon source addition method of the invention can quickly obtain accurate carbon source injected volume control data, to obviously save the medicament expense and electric energy of carbon source, the denitrification effect of denitrification deep-bed filter is improved, saves operating cost, it avoids carbon source from wasting, saves 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 system for a denitrification deep bed filter.
[ background art ]
The overall requirements of various watersheds in China on the comprehensive treatment of the water environment are continuously improved, and the complete reaching of the new standard discharge cannot be ensured under the condition that a plurality of domestic sewage plants are not upgraded and modified at present, and the method is particularly remarkable in the standard discharge problem of TN. The C/N ratio of the incoming water of a plurality of sewage plants is low, and the removal rate of TN cannot be guaranteed. In order to ensure the sewage plant to reach the standard and effectively control the discharge of TN, additional auxiliary carbon sources are needed to reduce the discharge of nitrate nitrogen and nitrite nitrogen, thereby reducing the discharge of TN.
The method for adding the carbon source is divided according to the position of a feeding point, and has two modes: adding in an anoxic zone in a biochemical section and adding in a denitrification filter in an advanced treatment section.
The first adding mode is that in the biochemical treatment process section, the theoretical removal rate of sewage TN is η ═ R + R)/(1+ R + R), a proper reflux ratio can be determined according to the numerical value of incoming water TKN, and when the proper reflux ratio is determined and TN cannot be effectively removed, an additional carbon source is considered.
The second feeding mode is as follows: and (4) adding the denitrification filter tank in the advanced treatment section. In the process of using the denitrification filter tank process for advanced wastewater treatment, most carbon sources (organic matters) of wastewater entering the advanced treatment stage are removed through the previous stage process treatment, and the carbon sources can be supplemented according to various indexes of incoming water. The method has obviously reduced carbon source adding amount compared with the first method, but COD and NO can not be fully considered in a plurality of denitrification processes3 -、NO2 -pH, T, DO and ORP have influence on the real-time addition of the carbon source, so the addition of the carbon source is still high.
Therefore, in order to improve the economical efficiency 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 addition of carbon sources, the invention provides a double-carbon-source adding method and a double-carbon-source adding system for a denitrification deep bed filter, which are used for realizing accurate addition of carbon sources.
The invention adopts the following technical scheme that a denitrification filter carbon source adding method collects Q, COD and NO of the denitrification filter3 -、NO2 -And the concentration parameters of pH, T, DO and ORP, and calculating the adding amount of the carbon source according to the collected parameters. The method comprises the following steps:
the first step is as follows: and (4) determining the carbon source adding quantity coefficient.
Selecting a carbon source, and measuring the addition amount of the carbon source required by complete reaction:
Cm＝Kmin～KmaxNoxin the formula
Cm is the amount of carbon source which needs to be added, mg/L;
Noxthe total concentration of the initial nitrate nitrogen and nitrite nitrogen is mg/L;
Kminis Nox -A lower limit coefficient for consuming the carbon source for complete reaction;
Kmaxis Nox -Upper limit coefficient for carbon source consumption for complete reaction.
Wherein the lower limit coefficient KminThe upper limit coefficient K can be regarded as known according to the inorganic chemical reaction equationmaxThe biochemical reaction direction is not unique according to different conditions, and the upper limit coefficient can be adjusted in different ranges according to different types of carbon sources and different sewage properties.
The second step is that: determination of carbon source addition type:
when (Nin-Nc)/Nin > 0.81,
q＝Kmax·(Nin-Nc)·Q/1000/C；
q is the adding amount of the carbon source, and L/h;
nin is the sum of the concentrations of nitrate nitrogen and nitrite nitrogen in the incoming water, mg/L;
nc is an internal control discharge index of the sum of the concentrations of nitrate nitrogen and nitrite nitrogen, mg/L;
q-inflow, m 3/h;
c is the adding concentration of the carbon source;
when (Nin-Nc)/Nin is less than or equal to 0.81,
q＝Kmin·Nin·Q/1000/C；
pH value, output NO3 -、NO2 -Concentration and Q, NO3 -、NO2 -Add to obtain NinThe pH value and η ═ N (were determinedin-Nc)/NinThe value of (d);
when the pH value is more than or equal to 7 and less than or equal to 8 and η is more than 0.81, the double carbon sources are added simultaneously (the molar ratio of the double carbon sources is n:1-n, n is more than 0 and less than 1)
q1＝n K1max·(Nin-Nc)·Q/1000/C1⑴
q2＝(1-n)K2max·(Nin-Nc)·Q/1000/C2⑵
When the pH value is more than or equal to 7 and less than or equal to 8 and η is less than or equal to 0.81, the double carbon sources are added simultaneously (the molar ratio of the double carbon sources is n:1-n, n is more than 0 and less than 1)
q1＝n K1min·Nin·Q/1000/C1⑶
q2＝(1-n)K2min·Nin·Q/1000/C2⑷
When the pH is less than 7 and η is more than 0.81, only sodium acetate is added
q2＝K2max·(Nin-Nc)·Q/1000/C2⑸
When the pH value is less than 7 and η is less than or equal to 0.81, only sodium acetate is added
q2＝K2min·Nin·Q/1000/C2⑹
When the pH value is more than 7 and η is more than 0.81, only adding acetic acid
q1＝K1max·(Nin-Nc)·Q/1000/C2⑺
When the pH value is more than 7 and η is less than or equal to 0.81, only adding acetic acid
q1＝K1min·Nin·Q/1000/C2⑻。
Further, the method also comprises the following steps of feeding back and adjusting the non-optimal operation state of the system:
when the ORP is less than or equal to-50 mV, the system operates normally; when ORP is more than-50 mV, the hydraulic retention time of the denitrification filter tank is increased by 10 minutes by adjusting a valve, carbon source addition adjustment is not needed, and the feedback is fed back to a central control room, so that the aeration of the biochemical section is seriously excessive.
The operable temperature T of the denitrification filter tank is 0-65 ℃, the optimal operating temperature T is 10-30 ℃, if the water temperature is abnormal, a T thermometer in the stirring tank judges whether the water temperature is in the optimal operating temperature state, if the water temperature is not in the optimal state, the hydraulic retention time of the denitrification filter tank is increased by 10 minutes through adjusting a valve, the carbon source adding adjustment is not needed, the water is fed back to a central control room, and abnormal water flow possibly enters the system.
Detecting the numerical value of nitrate nitrogen in water, wherein the numerical value is more than or equal to 0.5, and the system runs normally; when the value is less than 0.5, the No at this stage is indicatedxReduction to N2Very little production of cellular material (C)5H7NO2) Carbon source addition coefficient K1min、K1max、K2min、K2maxEvery 1 hour interval, the reduction is 5 percent and the maximum reduction is 20 percent until the system recovers the optimal operation state.
Detecting the numerical value of the nitrite nitrogen in the effluent, wherein the numerical value is less than or equal to 0.2, and the system operates normally; when the value is > 0.2, the No at this stage is indicatedxReduction to N2The quantity is reduced, the denitrifying bacteria are propagated in a large quantity, and a large quantity of NoxProduction of cellular Material (C)5H7NO2) Carbon source addition coefficient K1min、K1max、K2min、K2maxEvery 1 hour interval, the temperature is increased by 5 percent and is increased by 25 percent at most until the system returns to the optimal operation state.
Numerical value COD of intake water CODiAnd the value COD of the effluent CODOTo determine the CODx＝CODO-CODiWhen it is CODxThe operation of the system is less than or equal to 0, and the system is normal; when 0 is more than CODxLess than 2, which indicates that the denitrification time of the denitrification filter tank is insufficient, the hydraulic retention time is increased by 10 minutes, and carbon is not neededAdjusting the source adding amount; when COD is reachedxMore than or equal to 2, which indicates that the carbon source is added in serious excess.
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 denitrification filter carbon source adding system, which comprises an electromagnetic flow meter arranged at the water inlet, and 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 flow meter, wherein the acetic acid adding metering pump and the sodium acetate adding metering pump are respectively and correspondingly connected with an acetic acid storage tank and a sodium acetate storage tank;
sodium acetate is added into a metering pump and then is connected with a stirring tank;
a denitrification filter tank is connected behind the stirring tank, and a second COD analyzer and a second nitrate nitrogen analyzer are arranged between the denitrification filter tank and the water outlet;
the PLC control system is connected with an electromagnetic flow meter, a first COD analyzer, a first nitrate nitrogen analyzer, an acetic acid adding metering pump, a sodium acetate adding metering pump, an ORP meter, a T thermometer, a pH meter, a second COD analyzer and a second nitrate nitrogen analyzer.
Further, the device also comprises a pipeline mixer, and the sodium acetate is added into the metering pump and then is connected with the stirring tank through the pipeline mixer.
Further, an ORP meter, a T thermometer and a pH meter are installed 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 double-carbon-source dosing system of the denitrification deep-bed filter according to the embodiment.
In the figure: 1 is an electromagnetic flowmeter, 2 is a COD analyzer (water inlet), 3 is a nitrate nitrogen analyzer (water inlet), 4 is an acetic acid storage tank, 5 is a sodium acetate storage tank, 6 is an acetic acid adding metering pump, 7 is a sodium acetate adding metering pump, 8 is a pipeline mixer, 9 is a stirring tank, 10 is an ORP meter, 11 is a T thermometer, 12 is a pH meter, 13 is a denitrification filter tank, 14 is a COD analyzer (water outlet), 15 is a nitrate nitrogen analyzer (water outlet), and 16 is a PLC control system.
[ detailed description of the invention ]
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following embodiments and accompanying drawings.
Collecting Q, COD and NO of denitrification filter3 -、NO2 -And the parameters of the pH meter, the T meter, the DO meter and the ORP meter are provided for a central control system, and the central control system sends a control signal to the dosing metering pump according to the parameters. And the central control system accurately calculates the carbon source adding amount.
The first step is as follows: and (4) determining the carbon source adding quantity coefficient.
The adding amount of the carbon source is convenient for calculation, methanol is firstly used as an external carbon source, and the reaction mode has the following three possibilities:
first, NO3 -、NO2 -、CH3OH is totally decomposed into inorganic substances:
NO3 -+0.833CH3OH→0.833CO2+0.5N2+1.167H2O+OH-
NO2 -+0.5CH3OH→0.5CO2+0.5N2+0.5H2O+OH-
O2+0.667CH3OH→0.667CO2+1.333H2O
0.833×32÷14＝1.90；0.5×32÷14＝1.14；0.667×32÷32＝0.667；
cm is 1.90No +1.14N +0.667D, wherein
Cm is the amount of methanol which needs 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, NO3 -、NO2 -、CH3OH decomposes and synthesizes cell material (C) of denitrifying bacteria5H7NO2)：
NO3 -+1.08CH3OH+0.24H2CO3→0.056C5H7NO2+0.47N2+1.68H2O+HCO3 -
NO2 -+0.67CH3OH+0.53H2CO3→0.04C5H7NO2+0.48N2+1.23H2O+HCO3 -
O2+0.93CH3OH+0.056NO3 -→0.056C5H7NO2+1.64H2O+0.59H2CO3+0.056HCO3 -
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 addition of the carbon source can be absorbed and accumulated by bacteria excessively to form ineffective consumption of the carbon source, and the addition amount is controlled, so that the process is forbidden.
In the embodiment, the incoming water is the effluent of the secondary sedimentation tank, even the effluent after the high-efficiency sedimentation tank, aiming at the deep bed denitrification filter tank with short hydraulic retention time. The DO value of the effluent is lower, because the DO consumes less than 2% of the total carbon source (if DO is ignored, the actual adding amount of the carbon source needs to be slightly increased); NO of effluent2 -Also of low value, equivalent NO2 -The amount of carbon source consumed is less than NO3 -Amount of carbon source consumed (if NO is added)2 -Value combination to NO3 -The actual amount of carbon source added needs to be slightly reduced), and in summary, the amount of methanol added can be approximately expressed as:
Cm＝1.9～2.47Noxin the formula
Cm is the amount of methanol which needs to be added, mg/L;
Noxthe sum of the initial concentrations of nitrate nitrogen and nitrite nitrogen is mg/L;
1.9——Nox -lower limit coefficient of methanol consumption for complete reaction;
2.47——Nox -the upper limit factor of methanol consumption for complete reaction.
Computing by analogy
Acetic acid is used as an external carbon source, and the adding amount is approximately expressed as: cm 2.68-3.3 Nox(2.68 is a lower limit coefficient of consumed acetic acid, and 3.3 is an upper limit coefficient of consumed acetic acid);
sodium acetate is used as an external carbon source, and the adding amount is approximately expressed as: cm is 3.66-4.51 Nox(3.66 is the lower limit coefficient for sodium acetate consumption, 4.51 is the upper limit coefficient for sodium acetate consumption).
The second step is that: determination of carbon source addition type:
common carbon sources for municipal sewage plants are: methanol, acetic acid, propionic acid, butyric acid and glucose.
1. Is differentCarbon source pair Nox-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. Carbon source for the time required for domesticating the strains:
| type of carbon source | Methanol | Acetic acid | Propionic acid | Butyric acid | Glucose |
| Acclimation time of strain (d) | 29 | 14 | 14 | 15 | 23 |
The invention requires 30min of water conservancy residence time of the denitrification deep bed filter, 15d of strain acclimatization time and selection of a carbon source of acetic acid and sodium acetate.
According to different carbon source selections, the lower limit coefficient and the upper limit coefficient of the carbon source addition are respectively determined as Kmin、Kmax(this coefficient can be called directly in the PLC control system).
The carbon source is added by acetic acid, and the coefficient K1min＝2.68、K1max3.3, e.g. addition with sodium acetate, factor K2min＝3.66、K2max＝4.51。
And (3) determining the accurate adding amount:
when (N)in-Nc)/NinWhen the carbon content is more than 0.81,
q1＝K1max·(Nin-Nc)·Q/1000/C1；
or
q2＝K2max·(Nin-Nc)·Q/1000/C2；
Or adding the dual carbon sources simultaneously (the mol ratio of the sodium acetate is 1:3)
q1＝0.25K1max·(Nin-Nc)·Q/1000/C1，q2＝0.75K2max·(Nin-Nc)·Q/1000/C2。
q1The adding amount of acetic acid is L/h;
q2the dosage of sodium acetate is L/h;
Ninthe total concentration of nitrate nitrogen and nitrite nitrogen of the incoming water is mg/L;
Ncthe internal control discharge index of the sum of the concentrations of the nitrate nitrogen and the nitrite nitrogen is mg/L;
q-flow of incoming Water, m3/h；
C1The adding concentration of acetic acid is percent;
C2sodium acetate addition concentration,%.
When (N)in-Nc)/NinWhen the content is less than or equal to 0.81,
q1＝K1min·Nin·Q/1000/C1；
or
q2＝K2min·Nin·Q/1000/C2；
Or adding the dual carbon sources simultaneously (the mol ratio of the sodium acetate is 1:3)
q1＝0.25K1min·Nin·Q/1000/C1，q2＝0.75K2min·Nin·Q/1000/C2。
The embodiment of the invention aims at the deep bed denitrification filter tank with short hydraulic retention time, and the incoming water is the effluent of a secondary sedimentation tank, even the effluent after a high-efficiency sedimentation tank.
As shown in figure 1, the double-carbon-source adding system of the denitrification deep bed filter comprises an electromagnetic flowmeter 1, a COD analyzer (inflow) 2, a nitrate nitrogen analyzer (inflow) 3, an acetic acid storage tank 4, a sodium acetate storage tank 5, an acetic acid adding metering pump 6, a sodium acetate adding 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 tank 13, a COD analyzer (outflow) 14, a nitrate nitrogen analyzer (outflow) 15 and a PLC (programmable logic controller) control system 16.
Firstly, inoculation and strain domestication are carried out, and the process is carried out in a single grid of a deep bed denitrification filter. If the sewage plant is newly built, finished strains or residual sludge of other sewage plants can be directly added as inoculated strains; if the sewage plant is upgraded and modified, finished strains or sludge in the middle section of the anoxic section of the sewage plant can be directly added as inoculated strains (if the process is CASS or SBR and the like, the aeration of the biochemical tank can be stopped and the sludge can be inoculated by the sludge at the bottom of the tank after 1 hour of sedimentation). The strain domestication is based on the principle that a small amount of water enters at the initial stage and is gradually increased until the strain domestication is stably operated. During strain domestication, tap water or treated sewage before disinfection can be used as a water source to prepare a nutrient solution. The concentration of the nutrient solution is controlled as follows: CH (CH)3COONa(180mg/l)、KNO3(40mg/l)、MgSO4(18mg/l)、CaCl2(4mg/l)、KH2PO4(3mg/l)、FeCl3(1mg/l)、KI(0.4mg/l)、MnSO4(0.1mg/l)、H3BO3(0.1mg/l)、CoCl2(on demand), CuSO4(on demand), ZnSO4(as needed). After the debugging is stable and the strain acclimation is finished, backwashing water for debugging the cells can be used as finished strains and directly connected to other cells for use until the debugging of all the 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 14c(internal control discharge index of the sum of the concentrations of nitrate nitrogen and nitrite nitrogen, mg/L), C1(acetic acid adding concentration, effective component%) C2(sodium acetate adding concentration, effective component%) K1min2.68 (lower limit coefficient of acetic acid consumption), K1max3.3 (upper limit coefficient of acetic acid consumption), K2min3.66 (lower limit coefficient of consumption of sodium acetate), K2max4.51 (upper limit factor of sodium acetate consumed).
2. In the test run stage, the nitrate nitrogen analyzer (inlet water) 3 outputs No (initial nitrate nitrogen concentration, mg/L) and N (initial nitrite nitrogen concentration, mg/L) and the electromagnetic flowmeter 1 outputs Q (inflow water flow, m)3H) to the PLC control system 16, the PLC control system 16 adds the values of the input No and N to obtain Nin(Total concentration of nitrate nitrogen and nitrite nitrogen in the incoming water, mg/L), η is judged to be (N)in-Nc)/NinThe numerical value of (c) is calculated by the following formula. Simultaneously starting an acetic acid adding metering pump 6 and a sodium acetate adding metering pump 7 respectively according to the flow q1、q2Adding carbon source, adding acetic acid and adding data q of a metering pump 61Adding data q of sodium acetate adding metering pump 72The real-time feedback PLC control system 16 serves as a historical data record.
The first adding mode is as follows:
when η is more than 0.81, the dual carbon source is added simultaneously (the molar ratio of the sodium acetate is 1:3)
q1＝0.25K1max·(Nin-Nc)·Q/1000/C1⑴
q2＝0.75K2max·(Nin-Nc)·Q/1000/C2⑵
q1The adding amount of acetic acid is L/h;
q2the dosage of sodium acetate is L/h;
Ninthe total concentration of nitrate nitrogen and nitrite nitrogen of the incoming water is mg/L;
Ncthe internal control discharge index of the sum of the concentrations of the nitrate nitrogen and the nitrite nitrogen is mg/L;
q-flow of incoming Water, m3/h；
C1The adding concentration of acetic acid is the effective component percent;
C2adding concentration of sodium acetate to obtain effective components;
K1min2.68-lower coefficient of acetic acid consumption;
K1max3.3-upper limit coefficient of acetic acid consumption;
K2min3.66-lower coefficient of sodium acetate consumption;
K2max4.51-upper limit factor for sodium acetate consumption.
And (2) adding mode II:
when η is less than or equal to 0.81, the dual carbon source is added simultaneously (the mol ratio of the sodium acetate is 1:3)
q1＝0.25K1min·Nin·Q/1000/C1⑶
q2＝0.75K2min·Nin·Q/1000/C2⑷
3. In the formal operation stage, the pH value is output by a pH meter 12, the No (initial nitrate nitrogen concentration, mg/L) and N (initial nitrite nitrogen concentration, mg/L) are output by a nitrate nitrogen analyzer (water inlet) 3, and the Q (inflow water flow, m) is output by an electromagnetic flowmeter 13H) to the PLC control system 16, the PLC control system 16 adds the values of the input No and N to obtain Nin(the sum of the concentrations of nitrate nitrogen and nitrite nitrogen in the influent water, mg/L), and the pH value and η were judged to be equal to (N)in-Nc)/NinThe numerical value of (c) is calculated by the following formula. Simultaneously starting an acetic acid adding metering pump 6 and a sodium acetate adding metering pump 7 respectively according to the flow q1、q2Adding carbon source, adding acetic acid and adding data q of a metering pump 61Adding data q of sodium acetate adding metering pump 72The real-time feedback PLC control system 16 serves as a historical data record.
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 η is more than 0.81, the dual carbon sources are simultaneously added (the molar ratio of the sodium acetate is 1:3)
q1＝0.25K1max·(Nin-Nc)·Q/1000/C1⑴
q2＝0.75K2max·(Nin-Nc)·Q/1000/C2⑵
And (2) adding mode II:
when the pH value is more than or equal to 7 and less than or equal to 8 and η is less than or equal to 0.81, the dual carbon sources are simultaneously added (the molar ratio of the sodium acetate is 1:3)
q1＝0.25K1min·Nin·Q/1000/C1⑶
q2＝0.75K2min·Nin·Q/1000/C2⑷
And (3) adding mode three:
when the pH is less than 7 and η is more than 0.81, only sodium acetate (alkaline carbon source) is added
q2＝K2max·(Nin-Nc)·Q/1000/C2⑸
The adding mode is four:
when the pH value is less than 7 and η is less than or equal to 0.81, only sodium acetate is added
q2＝K2min·Nin·Q/1000/C2⑹
And a fifth adding mode:
when the pH is more than 7 and η is more than 0.81, only adding acetic acid (acidic carbon source)
q1＝K1max·(Nin-Nc)·Q/1000/C2⑺
And the adding mode is six:
when the pH value is more than 7 and η is less than or equal to 0.81, only adding acetic acid
q1＝K1min·Nin·Q/1000/C2⑻
4. And (5) feeding back and adjusting the non-optimal operation state of the system.
4.1, since the DO meter is not sensitive and accurate, the invention numerically reacts the anoxic state with the ORP meter 10 (installed at the outlet end of the stirred tank) in the stirred tank 9. When the ORP is less than or equal to-50 mV, the system operates normally; when ORP is more than-50 mV, the hydraulic retention time of the denitrification filter 13 is increased by 10 minutes by adjusting a valve, carbon source addition adjustment is not needed, and the feedback is fed back to a central control room, so that the aeration of the biochemical section is seriously excessive.
4.2, the operational temperature T of the denitrification filter tank 13 is 0-65 ℃, the optimal operational temperature T is 10-30 ℃, and the normal municipal sewage plant water temperature can be kept at 5-26 ℃ all the year round. Under normal conditions, the system can operate in an optimal or near optimal state, if the water temperature is abnormal, a T thermometer 11 in the stirring tank 9 judges whether the system is in the optimal operating temperature state, if the system is not in the optimal state, the hydraulic retention time of the denitrification filter tank 13 is increased by 10 minutes by adjusting a valve, the carbon source adding adjustment is not needed, the water is fed back to a central control room, and abnormal water flow possibly enters the system.
4.3, detecting the numerical value of nitrate nitrogen in water by a nitrate nitrogen analyzer (effluent) 15, wherein the numerical value is more than or equal to 0.5, and the system operates normally; when the value is less than 0.5 (mostly seen in the long-time operation of the system without back flushing), the No at this stage is indicatedxReduction to N2Very little production of cellular material (C)5H7NO2) Carbon source addition coefficient K1min、K1max、K2min、K2maxEvery 1 hour interval, the reduction is 5 percent and the maximum reduction is 20 percent, and only the system is recovered to the optimal running state.
4.4, detecting the numerical value of nitrite nitrogen in the effluent by a nitrate nitrogen analyzer (effluent) 15, wherein the numerical value is less than or equal to 0.2, and the system operates normally; when the value is more than 0.2 (mostly seen in the early stage of the system after long backwashing), the No at the stage is shownxReduction to N2In the reducing, denitrifying bacteriaMass propagation of large amount of NoxProduction of cellular Material (C)5H7NO2) Carbon source addition coefficient K1min、K1max、K2min、K2maxEvery 1 hour interval, the temperature is increased by 5 percent and at most by 25 percent until the system recovers the optimal operation state.
4.5, outputting the value COD by a COD analyzer (inlet water) 2iAnd the COD analyzer (effluent) 14 outputs the value CODOTo the PLC control system 16, the PLC control system 16 inputs the CODiAnd CODOTo determine the CODx＝CODO-CODiWhen it is CODxThe operation of the system is less than or equal to 0, and the system is normal; when 0 is more than CODxIf the water content in the denitrification filter 13 is less than 2, the denitrification time of the denitrification filter is insufficient, the hydraulic retention time is increased by 10 minutes, and the addition adjustment of a carbon source is not needed; when COD is reachedxAnd (4) more than or equal to 2, indicating that the adding amount of the carbon source is seriously excessive, and checking the accuracy of the output values and the real flow rates of the acetic acid adding metering pump 6 and the sodium acetate adding metering pump 7.
The above examples only use acetic acid and sodium acetate as the dual carbon source to illustrate the technical idea of the present invention, and the technical idea (including other carbon source combinations) proposed by the present invention and any modification made on the basis of the technical scheme are within the scope of the present invention. The technology not related to the invention can be realized by the prior art.
Claims (8)
1. A dual-carbon-source adding method for deep denitrifying filter pool includes collecting Q, COD and NO in deep denitrifying filter pool3 -、NO2 -The concentration parameter comprises the following steps:
the first step is as follows: determining a carbon source adding amount coefficient;
selecting a carbon source, and measuring the addition amount of the carbon source required by complete reaction:
Cm＝Kmin～KmaxNoxin the formula
Cm is the amount of carbon source which needs to be added, mg/L;
Noxthe total concentration of the initial nitrate nitrogen and nitrite nitrogen is mg/L;
Kminis Nox -A lower limit coefficient for consuming the carbon source for complete reaction;
Kmaxis Nox -The upper limit coefficient of carbon source consumption for complete reaction;
the second step is that: determination of carbon source addition type:
when (Nin-Nc)/Nin > 0.81,
q＝Kmax·(Nin-Nc)·Q/1000/C；
q is the adding amount of the carbon source, and L/h;
nin is the sum of the concentrations of nitrate nitrogen and nitrite nitrogen in the water, mg/L;
nc is an internal control discharge index of the sum of the concentrations of nitrate nitrogen and nitrite nitrogen, mg/L;
q is the flow rate of the incoming water, m 3/h;
c is the adding concentration of the carbon source;
when (Nin-Nc)/Nin is less than or equal to 0.81,
q＝Kmin·Nin·Q/1000/C。
2. the dual-carbon-source adding method of the denitrification deep-bed filter according to claim 1, which is characterized in that:
the molar ratio of the two carbon sources is n:1-n, n is more than 0 and less than 1
When (N)in-Nc)/NinWhen the carbon content is more than 0.81,
q1＝K1max·(Nin-Nc)·Q/1000/C1；
or
q2＝K2max·(Nin-Nc)·Q/1000/C2；
Or the double carbon sources are added simultaneously according to
q1＝n K1max·(Nin-Nc)·Q/1000/C1，q2＝(1-n)K2max·(Nin-Nc)·Q/1000/C2。
q1、q2Respectively adding two carbon sources；
NinThe total concentration of nitrate nitrogen and nitrite nitrogen of the running water;
Ncthe emission index is the internal control emission index of the sum of the concentrations of nitrate nitrogen and nitrite nitrogen;
q is the flow of the incoming water;
C1、C2adding concentrations of two carbon sources respectively;
when (N)in-Nc)/NinWhen the content is less than or equal to 0.81,
q1＝K1min·Nin·Q/1000/C1；
or,
q2＝K2min·Nin·Q/1000/C2；
or simultaneously adding two carbon sources:
q1＝n K1min·Nin·Q/1000/C1，q2＝(1-n)K2min·Nin·Q/1000/C2。
3. the dual-carbon-source adding method of the denitrification deep-bed filter according to claim 1, which is characterized in that:
collecting the pH value and NO of the denitrification filter3 -、NO2 -Concentration of NO3 -、NO2 -Add to obtain NinThe pH value and η ═ N (were determinedin-Nc)/NinThe value of (d);
determining two external carbon sources, wherein the molar ratio of the carbon sources is n: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 η is more than 0.81, the double carbon sources are added simultaneously:
q1＝n K1max·(Nin-Nc)·Q/1000/C1⑴
q2＝(1-n)K2max·(Nin-Nc)·Q/1000/C2⑵
when the pH value is more than or equal to 7 and less than or equal to 8 and η is less than or equal to 0.81, the double carbon sources are added simultaneously:
q1＝n K1min·Nin·Q/1000/C1⑶
q2＝(1-n)K2min·Nin·Q/1000/C2⑷
when the pH is less than 7 and η is more than 0.81, only the alkaline carbon source is added
q2＝K2max·(Nin-Nc)·Q/1000/C2⑸
When the pH is less than 7 and η is less than or equal to 0.81, only adding the alkaline carbon source
q2＝K2min·Nin·Q/1000/C2⑹
When the pH is more than 7 and η is more than 0.81, only adding the acidic carbon source
q1＝K1max·(Nin-Nc)·Q/1000/C2⑺
When the pH value is more than 7 and η is less than or equal to 0.81, only adding the acidic carbon source
q1＝K1min·Nin·Q/1000/C2⑻。
4. The dual-carbon-source adding method of the denitrification deep-bed filter according to claim 3, which is characterized in that:
the method also comprises the following steps of feeding back and adjusting the non-optimal running state of the system:
when the 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 tank 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 by adjusting a valve;
detecting the numerical value of nitrate nitrogen in water, wherein the numerical value is more than or equal to 0.5, and the system runs normally; when the value is less than 0.5, the carbon source addition coefficient K1min、K1max、K2min、K2maxReducing by 5 percent and at most by 20 percent every 1 hour until the system recovers the optimal running state;
detecting the numerical value of the nitrite nitrogen in the effluent, wherein the numerical value is less than or equal to 0.2, and the system operates normally; when the value is more than 0.2, the carbon source adding coefficient K1min、K1max、K2min、K2maxEvery interval of 1 hourIncreasing by 5% and at most by 25% until the system recovers the optimal operation state;
numerical value COD of intake water CODiAnd the value COD of the effluent CODOTo determine the CODx＝CODO-CODiWhen it is CODxThe operation of the system is less than or equal to 0, and the system is normal; when 0 is more than CODxThe hydraulic retention time is increased by 10 minutes without adding and adjusting a carbon source; when COD is reachedxMore than or equal to 2, which indicates that the carbon source is added in serious excess.
5. The dual-carbon-source adding method of the denitrification deep-bed filter according to claim 3 or 4, which is characterized in that:
the carbon source comprises: two or more of methanol, acetic acid, sodium acetate, propionic acid, butyric acid and glucose.
6. A system using the denitrification deep bed filter tank double carbon source adding method as defined in any one of claims 1 to 5, which is characterized in that:
the device comprises an electromagnetic flow meter arranged at a water inlet, and 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 flow meter, wherein the acetic acid adding metering pump and the sodium acetate adding metering pump are respectively and correspondingly connected with an acetic acid storage tank and a sodium acetate storage tank;
sodium acetate is added into a metering pump and then is connected with a stirring tank;
a denitrification filter tank is connected behind the stirring tank, and a second COD analyzer and a second nitrate nitrogen analyzer are arranged between the denitrification filter tank and the water outlet;
the PLC control system is connected with an electromagnetic flow meter, a first COD analyzer, a first nitrate nitrogen analyzer, an acetic acid adding metering pump, a sodium acetate adding metering pump, an ORP meter, a T thermometer, a pH meter, a second COD analyzer and a second nitrate nitrogen analyzer.
7. The carbon source adding system of the denitrification filter tank as claimed in claim 6, wherein: the sodium acetate is added into a metering pump and then is connected with a stirring tank through a pipeline mixer.
8. The carbon source adding system of the denitrification filter tank as claimed in claim 6, wherein: an ORP meter, a T thermometer and a pH meter are arranged on the stirring tank.
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| CN113307365A (en) * | 2021-06-18 | 2021-08-27 | 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 |
| 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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