CN114477451A - Denitrifying biological efficient phosphorus removal method applied to sewage treatment - Google Patents
Denitrifying biological efficient phosphorus removal method applied to sewage treatment Download PDFInfo
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 88
- 239000011574 phosphorus Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 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 57
- 238000010992 reflux Methods 0.000 claims abstract description 50
- 238000005273 aeration Methods 0.000 claims abstract description 43
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000010802 sludge Substances 0.000 claims description 29
- 241000894006 Bacteria Species 0.000 abstract description 21
- 238000010521 absorption reaction Methods 0.000 abstract description 10
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 238000006396 nitration reaction Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 77
- 229910052757 nitrogen Inorganic materials 0.000 description 39
- 230000001276 controlling effect Effects 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 16
- 230000000694 effects Effects 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 150000004676 glycans Chemical class 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 230000003578 releasing effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 241000233866 Fungi Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010921 in-depth analysis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention discloses a denitrifying biological efficient phosphorus removal method applied to sewage treatment, and belongs to the technical field of sewage treatment. The method comprises the following steps: controlling the concentration of nitrate nitrogen at the tail end of the anaerobic zone through external reflux adjustment in the anaerobic zone; secondly, ensuring an anoxic environment and controlling the concentration of nitrate nitrogen at the tail end of the anoxic zone through the control of DO concentration at an internal reflux point and reflux quantity in the anoxic zone; and step three, setting an ammonia nitrogen control point close to the tail end of the aerobic tank, setting an internal control value, and optimizing the total aeration quantity. In the invention, the technological parameters of the anaerobic zone are adjusted to create conditions for phosphorus release of phosphorus accumulating bacteria, the phosphorus accumulating bacteria occupy advantages, and organisms efficiently release phosphorus in the anaerobic zone to create conditions for phosphorus absorption in a subsequent anoxic zone; the process parameters of the anoxic zone are adjusted to better denitrify and absorb phosphorus for organisms, so that the realization of efficient denitrification and dephosphorization is ensured; in the aerobic zone, the organisms are subjected to assimilation and nitration reaction, the total aeration quantity is controlled, the over-aeration is reduced, and in addition, the alternate cyclic aeration is more favorable for the efficient denitrification of the organisms.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a denitrifying biological efficient phosphorus removal method applied to sewage treatment.
Background
Under the background of improving quality and increasing efficiency of a sewage treatment plant, in recent years, the nitrogen removal efficiency of a biological treatment unit of a municipal sewage plant is remarkably improved, but the biological phosphorus removal efficiency has a certain space, the biological phosphorus removal rate of most water plants is less than 60%, and the statement and the method of 'carbon source competition theory, external reflux enhanced nitrogen removal' are common, so that an actual 'nitrogen and phosphorus conservation and abandoning' mode is formed. The process control leads to low biological phosphorus removal rate due to 'diazo light phosphorus', the anaerobic zone basically has no phosphorus release, the anoxic zone and the aerobic zone have no phosphorus absorption, and the process excessively depends on chemical phosphorus removal.
The control mode of the existing biological treatment process technology of the sewage plant treatment plant has the following defects: firstly, the phosphorus release level of the anaerobic pool is low; (II) nitrate nitrogen in the anoxic tank basically has no denitrification dephosphorization phenomenon; and thirdly, the biological denitrification and dephosphorization effects of the aerobic tank are poor.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention provides a denitrifying biological efficient phosphorus removal method applied to sewage treatment.
The technical scheme is as follows: a denitrification biological high-efficiency phosphorus removal method applied to sewage treatment adopts an AAO sewage treatment method, and is characterized by comprising the following steps:
controlling the concentration of nitrate nitrogen at the tail end of the anaerobic zone through external reflux adjustment in the anaerobic zone;
secondly, ensuring an anoxic environment and controlling the concentration of nitrate nitrogen at the tail end of the anoxic zone through the control of DO concentration at an internal reflux point and reflux quantity in the anoxic zone;
and step three, setting an ammonia nitrogen control point close to the tail end of the aerobic tank, setting an internal control value, and optimizing the total aeration quantity.
In a further embodiment, the nitrate nitrogen concentration at the end of the anaerobic zone is < 1 mg/L.
In a further embodiment, the concentration of nitrate nitrogen at the end of the anoxic zone is in the range of 1-3 mg/L.
In a further embodiment, the first step also comprises controlling the total phosphorus load of the anaerobic zone within the range of 0.016-0.08 gTP/gMLVSS.d, BOD/TP is more than or equal to 12, DO concentration is less than or equal to 0.2mg/L, ORP is within the range of-100-225 mV; preferably, the DO concentration is 0.1 mg/L.
In a further embodiment, the denitrification load of the anoxic zone in the second step is controlled within the range of 0.08-0.13 gTN/gMLVSS.d, the DO concentration is less than or equal to 0.2mg/L, and the ORP is within the range of-50 to-150 mV; preferably, the DO concentration is 0.1 mg/L.
In a further embodiment, an ammonia nitrogen control point is arranged in a section which is 75-85% of the way near the tail end of the aerobic tank in the third step, an internal control value is set, the upper limit is set to be 45-55% of the ammonia nitrogen standard value, the lower limit is set to be 5-15% of the ammonia nitrogen standard value, the total aeration amount is optimized, and the occurrence of over-aeration is avoided; preferably, an ammonia nitrogen internal control point and an ammonia nitrogen internal control value are arranged in a range which is close to the end of the aerobic tank and extends along 80 percent of the way, the upper limit is set to be 50 percent of the ammonia nitrogen standard value, and the lower limit is set to be 10 percent of the ammonia nitrogen standard value.
In a further embodiment, the sludge load of the aerobic zone in the third step is controlled within the range of 0.1-0.25 kgCOD/kgMLVSS, the aeration mode adopts an alternate intermittent circulation mode, and the DO concentration along the process of aeration is controlled within the range of 0.5-1.5 mg/L.
In a further embodiment, the three steps control the internal reflux ratio and the DO concentration of the internal reflux point; controlling the internal reflux to be in the range of 180-220%, wherein the DO concentration at the internal reflux point is less than 0.5 mg/L; the pH value of the aerobic zone is set to be 7.0-8.0, the sludge concentration MLVSS is kept at 2000-3000 mg/L, and the sludge age is suitable for 15-30 days; preferably, the internal reflux is 200%.
Has the advantages that: adjusting process parameters of an anaerobic zone to create conditions for phosphorus release of phosphorus accumulating bacteria, controlling the total phosphorus load, DO, ORP and nitrate nitrogen concentration to ensure that the phosphorus accumulating bacteria dominate in a symbiotic environment of the phosphorus accumulating bacteria and glycan bacteria, and efficiently releasing phosphorus in the anaerobic zone by organisms to create conditions for phosphorus absorption of a subsequent anoxic zone; the technological parameters of the anoxic zone are adjusted to realize better nitrogen and phosphorus removal of organisms, the environment of the anoxic zone is strictly maintained at the stage, the concentrations of carbon source, DO and nitrate nitrogen are accurately controlled, and the realization of efficient nitrogen and phosphorus removal is ensured; in an aerobic zone, organisms are subjected to assimilation and nitration reaction, DO is strictly controlled, endogenous respiration is reduced, total aeration quantity is controlled through indexes of ammonia nitrogen at the tail end, occurrence of over-aeration is reduced, and in addition, alternate cyclic aeration is more beneficial to efficient denitrification of the organisms; the strict control of the internal reflux point DO creates an excellent environment for the anoxic zone, and is beneficial to improving the nitrogen and phosphorus removal efficiency.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to solve the problems in the prior art, the applicant has conducted in-depth analysis on various existing schemes, which are specifically as follows:
the control mode of the existing biological treatment process technology of the sewage plant treatment plant has the following defects: firstly, the phosphorus release level of the anaerobic pool is low; (II) the nitrate nitrogen in the anoxic tank basically has no denitrification dephosphorization phenomenon; and thirdly, the biological denitrification and dephosphorization effects of the aerobic tank are poor.
Therefore, the applicant provides the following solution, researchers find out that a simple and convenient control method for efficient phosphorus release in an anaerobic zone and efficient biological nitrogen and phosphorus absorption in an anoxic zone effectively saves carbon sources, phosphorus removal agents, aeration amount and sludge yield in production, and demonstrate feasibility of the method for engineering application and comprehensive popularization of municipal sewage treatment plants.
As shown in fig. 1, the embodiment provides a denitrifying biological efficient phosphorus removal method applied to sewage treatment, which specifically comprises the following steps:
in biological phosphorus removal, the phosphorus-accumulating bacteria and the glycan bacteria are two different bacterial flora, and exist in the biological phosphorus removal process together, and under the anaerobic condition, the absorption of organic substrates (such as carbon sources) existing in an environmental solution is necessarily competitive; the anaerobic tanks of some sewage treatment plants have low phosphorus release level, and the reason is that the glycan fungi become dominant bacteria in competition, and the phosphorus-accumulating fungi release phosphorus with low efficiency; in order to solve the problem, the following technical scheme is proposed:
controlling the technological parameters of the anaerobic zone, improving the growth environment of the phosphorus-accumulating bacteria and the glycan bacteria, enabling the phosphorus-accumulating bacteria to become dominant bacteria, and further improving the phosphorus release level of the anaerobic zone.
Controlling TP load, DO concentration and ORP of the anaerobic zone; the total phosphorus load of the anaerobic zone is controlled to be 0.016-0.08 g TP/g MLVSS.d (namely, each gram of activated sludge organic matter consumes 0.016-0 g of total phosphorus per day08g), BOD/TP is more than or equal to 12, DO concentration is less than or equal to 0.2mg/L, the lower the DO concentration is, the better, preferably, the DO concentration is 0.1mg/L, and ORP is in the range of-100 to-225 mV; wherein TP is total phosphorus, DO concentration is the dissolved amount of oxygen in water, ORP is oxidation-reduction potential, and BOD is biological oxygen demand; meanwhile, nitrate Nitrogen (NO) at the tail end of the anaerobic zone is controlled by adjusting external reflux3N) concentration, in particular of NO3-N < 1 mg/L; the requirement of reducing the external reflux ratio under the condition of stable sludge concentration of the biochemical tank is met, and the effect is better when the external reflux ratio is in a range of 50-80 percent; when the external reflux nitrate nitrogen is high, the anaerobic water distribution ratio is properly increased to reduce the annual concentration of the external reflux nitrate nitrogen, and further to control the concentration NO of the nitrate nitrogen at the tail end of the anaerobic zone3-N < 1 mg/L; detection of anaerobic zone terminal NO once a day3N, and timely adjusting, the conditional water plant can be provided with an online nitrate nitrogen instrument at the tail end of the anaerobic zone to detect NO in real time3And N, adjusting the reflux ratio according to the data by an operator.
Regarding the control parameters of nitrate nitrogen in the anaerobic zone, because the release of phosphorus-accumulating bacteria is reduced due to the existence of nitrate nitrogen, the nitrate nitrogen generates denitrification under the anaerobic condition to consume a nutrient source (a carbon source), which is beneficial to the growth of glycan bacteria, in order to reduce the concentration of the nitrate nitrogen as much as possible, external reflux is required to be strictly controlled (the nitrate nitrogen in the anaerobic zone is basically brought by the external reflux), and the external reflux ratio delta range is 50-100% according to the design principle; setting the concentration of the total nitrogen of the effluent as rho, the percentage of the nitrate nitrogen content in the total nitrogen of the effluent as epsilon, and the maximum concentration of the nitrate nitrogen at the anaerobic front end
In this embodiment, ρ is 15mg/L (standard value), ε is 80%, and δ is 50%, then the maximum value α of nitrate nitrogen concentration at the anaerobic front end is obtainedmax4 mg/L; the carbon source in the anaerobic zone is sufficient, the removal rate of the conventional denitrification nitrate nitrogen is set to be mu, the concentration of the nitrate nitrogen at the anaerobic front end is set to be alpha, and the concentration of the nitrate nitrogen at the anaerobic tail end is set to be beta, then
In this embodiment, μ is 75%, and α is αmaxSubstituted at 4mg/LThe concentration beta of nitrate nitrogen at the anaerobic tail end is 1mg/L, the concentration threshold of the nitrate nitrogen at the anaerobic tail end is obtained, long-term experiments prove that when the concentration of the nitrate nitrogen at the tail end of the anaerobic tank is less than 1mg/L, phosphorus releasing effect of phosphorus accumulating bacteria is better, and efficient phosphorus releasing in an anaerobic zone is realized.
The process parameters of the anaerobic zone are controlled to create conditions for phosphorus release of the phosphorus-accumulating bacteria, and the carbon source provides energy for the growth of the phosphorus-accumulating bacteria and the subsequent phosphorus absorption. The control of the total phosphorus load, the DO concentration, the ORP and the nitrate nitrogen concentration is that the phosphorus-accumulating bacteria and the glycan bacteria are dominant in the symbiotic environment, and the organisms release phosphorus efficiently in the anaerobic zone to create conditions for the subsequent phosphorus absorption in the anoxic zone.
In the prior art, nitrate nitrogen in an anoxic pond basically has no denitrification dephosphorization phenomenon, and the accidental denitrification dephosphorization phenomenon of a few water plants has obvious effect on improving the biological denitrification dephosphorization efficiency, but the control principle and logic are unclear, so that the anoxic pond can not be popularized and applied; in order to solve the problem, the following technical scheme is proposed:
and step two, controlling the technological parameters of the anoxic zone.
Controlling the denitrification load of an anoxic zone within the range of 0.08-0.13 gTN/g MLVSS.d (namely, each gram of activated sludge organic matter consumes 0.08-0.13 g of total nitrogen per day), wherein the DO concentration is less than or equal to 0.2mg/L, the lower the DO concentration is, the better the DO concentration is, preferably, the DO concentration is 0.1mg/L, and the ORP is within the range of-50-150 mV; wherein TN is total nitrogen.
The nitrate nitrogen at the tail end of the anoxic zone is strictly controlled at 1-3mg/L from the uncontrolled state in the prior art; on the premise of meeting the requirement of biological denitrification, the laboratory detects NO at the tail end of the anoxic zone once a day3-N concentration, adjusting the internal reflux flow in time. The adjustment of the process in the anoxic zone is to achieve better biological denitrification and phosphorus uptake, and the method mainly strictly maintains the anoxic zone environment at this stage, accurately controls the carbon source, DO concentration and nitrate nitrogen concentration, and ensures the realization of efficient denitrification and phosphorus removal.
The concentration of nitrate nitrogen at the tail end of the anaerobic zone is set to be gamma, because denitrifying phosphorus accumulating bacteria need a reaction substrate, in order to avoid changing the environment of the anoxic zone into an anaerobic environment, the lower limit of the concentration of nitrate nitrogen at the tail end of the anaerobic zone is gammaminSetting the concentration to be 1 mg/L; upper limit gamma of nitrate nitrogen concentration at end of anaerobic zonemaxNumerical calculationThe process is as follows:
setting the denitrification efficiency as theta and the internal reflux ratio as
The external reflux ratio is pi, then
The design value of external reflux is 50-100%, the design value of internal reflux is 100-300%, in this embodiment, the external reflux ratio pi is 100%, and the internal reflux ratio
300%, the denitrification efficiency theta is 80% at most, because the concentration of total nitrogen in the effluent is rho 15mg/L (standard value) and the upper limit value considering 5 times dilution is 3, gammamax3mg/L, if the risk is increased, the method has excessive risk and is not economical; long-term tests prove that when nitrate nitrogen gamma at the tail end of the anoxic zone is controlled within the range of 1-3mg/L, efficient nitrogen and phosphorus removal in the anoxic zone is realized.
Researches find that the biological denitrification and dephosphorization effects of the aerobic tank are poor; the aerobic tank is serious in overexposure, and the DO concentration of the internal reflux mixed liquor is high, so that biological nitrogen and phosphorus removal is influenced; in order to solve the problem, the following technical scheme is proposed:
step three, controlling the technological parameters of the aerobic zone; controlling sludge load, aeration mode and DO concentration; the sludge load of the aerobic zone is controlled to be 0.1-0.25 kgCOD/kgMLVSS (namely, each kilogram of active sludge organic matter consumes 0.1-0.25 kg of chemical oxygen demand per day), the aeration mode adopts an alternate intermittent circulation mode as far as possible, and the DO concentration along the process during aeration is controlled to be 0.5-1.5 mg/L; wherein COD is chemical oxygen demand.
Micro-aerobic aeration is realized by controlling ammonia nitrogen at the end along the way, endogenous respiration is reduced, and the nitrogen and phosphorus removal efficiency of the system is improved; controlling the total aeration amount by adopting an ammonia nitrogen index, setting an ammonia nitrogen internal control point and an ammonia nitrogen internal control value within an interval range of 75-85% of the end of the aerobic tank along the process, wherein the upper limit is set to be 45-55% of the ammonia nitrogen standard value, and the lower limit is set to be 5-15% of the ammonia nitrogen standard value; preferably, an ammonia nitrogen internal control point and an ammonia nitrogen internal control value are arranged in a range which is 80% of the way close to the tail end of the aerobic tank, the upper limit is set to be 50% of the ammonia nitrogen standard value, and the lower limit is set to be 10% of the ammonia nitrogen standard value; according to the aeration rate regulated and controlled by the ammonia nitrogen at the internal control point, the ammonia nitrogen is higher than the aeration rate, the ammonia nitrogen is lower than the aeration rate, the aeration rate is reduced, the over-aeration in an aerobic zone is avoided, the carbon source in the microorganism can be more fully utilized for nitrogen and phosphorus removal, and the effect of the carbon source for nitrogen and phosphorus removal is improved.
Controlling the internal reflux ratio and the DO concentration of an internal reflux point; in order to avoid the influence of the internal reflux on the denitrification phosphorus absorption, the internal reflux is most suitable for 200%, the DO concentration at the internal reflux point is less than 0.5mg/L, and the lower the DO concentration is, the better the DO concentration is, the lower the DO concentration is, the realization is realized by arranging an oxygen elimination area. Controlling pH, sludge concentration and sludge age; through a large number of researches, the pH is preferably 7.0-8.0, the sludge concentration MLVSS is kept at 2000-3000 mg/L, and the sludge age is preferably 15-30 days.
In the aerobic zone, organisms are subjected to assimilation and nitration reaction, DO concentration is strictly controlled, endogenous respiration is reduced, total aeration quantity is controlled through indexes of ammonia nitrogen at the tail end, over-aeration is reduced, and in addition, alternate cyclic aeration is more beneficial to efficient denitrification of the organisms. The strict control of the DO concentration at the internal reflux point creates an excellent environment for the anoxic zone, and is beneficial to the improvement of the nitrogen and phosphorus removal efficiency.
Example 1
Controlling TP load, DO concentration and ORP of the anaerobic zone; the total phosphorus load of the anaerobic zone is controlled to be 0.016-0.08 g TP/gMLVSS.d, BOD/TP is more than or equal to 12, DO concentration is less than or equal to 0.2mg/L, and ORP is in the range of-100 to-225 mV; simultaneously, the nitrate Nitrogen (NO) at the tail end of the anaerobic zone is controlled by adjusting the external reflux3-N) concentration 0.21 mg/L; controlling denitrification load of an anoxic zone within the range of 0.08-0.13 gTN/gMLVSS.d, controlling DO concentration to be less than or equal to 0.2mg/L and controlling ORP within the range of-50-150 mV; nitrate Nitrogen (NO) at the end of anoxic zone3-N) concentration 1.24 mg/L; controlling the sludge load of the aerobic zone to be 0.1-0.25 kgCOD/kgMLVSS, adopting an alternate intermittent circulation mode as far as possible in an aeration mode, and controlling the DO concentration along the process during aeration to be 0.5-1.5 mg/L; micro-aerobic aeration is realized by controlling ammonia nitrogen at the end along the way, endogenous respiration is reduced, and the nitrogen and phosphorus removal efficiency of the system is improved; the total aeration amount is controlled by adopting ammonia nitrogen indexes, and the total aeration amount is close to the tail end of the aerobic tank (80 percent of the area along the way)The method comprises the following steps of (1) setting an ammonia nitrogen internal control point and an internal control value, setting the upper limit to be 50% of an ammonia nitrogen standard value, setting the lower limit to be 10% of the ammonia nitrogen standard value, regulating and controlling aeration quantity according to the ammonia nitrogen of the internal control point, increasing the aeration quantity due to high ammonia nitrogen, reducing the aeration quantity due to low ammonia nitrogen, avoiding over aeration in an aerobic zone, more fully utilizing a carbon source in microorganisms for nitrogen and phosphorus removal, and improving the effect of the carbon source for nitrogen and phosphorus removal; controlling the internal reflux ratio and the DO concentration of an internal reflux point; in order to avoid the influence of the internal reflux on the denitrification phosphorus absorption, the internal reflux is 200 percent, the DO concentration of an internal reflux point is less than 0.5mg/L, and the lower the DO concentration is, the better the DO concentration is, the lower the DO can be realized by arranging an oxygen elimination area; controlling pH, sludge concentration and sludge age; through a large number of researches, the pH value is preferably 7.0-8.0, the sludge concentration MLVSS is kept at 2000-3000 mg/L, and the sludge age is preferably 15-30 days.
Example 2
On the basis of embodiment 1, the present embodiment is different from embodiment 1 in that: nitrate Nitrogen (NO) at the end of anaerobic zone3-N) concentration 0.49 mg/L; nitrate Nitrogen (NO) at the end of anoxic zone3-N) concentration was 2.47 mg/L.
Example 3
On the basis of embodiment 1, the present embodiment is different from embodiment 1 in that: nitrate Nitrogen (NO) at the end of anaerobic zone3-N) concentration 0.18 mg/L; nitrate Nitrogen (NO) at the end of anoxic zone3-N) concentration was 2.43 mg/L.
Example 4
On the basis of embodiment 1, the present embodiment is different from embodiment 1 in that: nitrate Nitrogen (NO) at the end of anaerobic zone3-N) concentration 5.27 mg/L; nitrate Nitrogen (NO) at the end of anoxic zone3-N) concentration was 4.66 mg/L.
Example 5
On the basis of embodiment 1, the present embodiment is different from embodiment 1 in that: nitrate Nitrogen (NO) at the end of anaerobic zone3-N) concentration 4.93 mg/L; nitrate Nitrogen (NO) at the end of anoxic zone3-N) concentration was 3.67 mg/L.
Example 6
On the basis of embodiment 1, the present embodiment is different from embodiment 1 in that: nitrate Nitrogen (NO) at the end of anaerobic zone3-N) concentration 4.63 mg/L; nitrate Nitrogen (NO) at the end of anoxic zone3-N) concentration was 4.83 mg/L.
The Total Phosphorus (TP) concentration was measured in the total feed water before the feed lift pump, the outlet end of the anaerobic zone, the end of the anoxic zone, and the outlet end of the aerobic zone in examples 1-6. The test data are as follows:
as can be seen from the above table: examples 1 to 3 adopt the method to control the concentration of nitrate nitrogen at the end of the anaerobic zone to be less than 1mg/L, when the concentration of nitrate nitrogen at the end of the anoxic zone is 1 to 3mg/L, the concentration of TP at the water outlet end of the anaerobic zone is two times or even more times of the concentration of TP in total inlet water before the water inlet lift pump, and the concentrations of TP at the water outlet end of the aerobic zone and the water outlet end of the secondary sedimentation tank are far less than the concentration of TP in total inlet water before the water inlet lift pump; in examples 4 to 6, the concentrations of nitrate nitrogen at the tail end of the anaerobic zone and the tail end of the anoxic zone are not strictly controlled, the concentration of TP at the water outlet end of the anaerobic zone is hardly changed compared with the concentration of TP in total water inlet before a water inlet lifting pump, and the concentrations of TP at the water outlet end of the aerobic zone and the water outlet end of a secondary sedimentation tank are also slightly different from the concentration of TP in total water inlet before the water inlet lifting pump, so that the phosphorus release effect in the anaerobic zone is poor in examples 4 to 6, the phosphorus removal effect in the anoxic zone and the aerobic zone is poor, the phosphorus release effect in the anaerobic zone is greatly improved in examples 1 to 3, and the phosphorus removal effect in the anoxic zone and the aerobic zone is greatly improved.
The method greatly improves the phosphorus treatment efficiency of organisms, saves carbon sources and phosphorus removal agents, reduces aeration quantity and sludge yield, and further improves quality and efficiency compared with the traditional process. The process parameters of AAO anaerobic, anoxic and aerobic zones are adjusted to realize the environment of efficient anaerobic phosphorus release and anoxic phosphorus absorption; the main parameters to be adjusted are: carbon source, DO concentration, pH value, nitrate nitrogen concentration and the like of the biochemical pond, biological sludge concentration, sludge age, total phosphorus load, denitrification load and sludge load, internal and external reflux ratio and sludge discharge amount. Realizes 'one carbon dual-purpose' in the anoxic zone, efficiently absorbs phosphorus, improves the utilization rate of nitrogen and phosphorus removal of carbon sources in the inlet water, and reduces the aeration rate and the yield of biological sludge in the aerobic zone. After denitrification dephosphorization is realized by improving the environment of anaerobic, anoxic and aerobic areas of biological treatment, the biological dephosphorization rate can be increased from the original lower than 60% to higher than 80%, the effluent TP of the secondary sedimentation tank can meet the first-class A standard of GB18918-2002 under most conditions, the dosage of chemical dephosphorization agents is greatly reduced, the COD of the whole system is saved by 50%, the aeration rate is saved by 30%, the sludge yield is reduced by 50%, and remarkable economic and social effects are brought.
Claims (8)
1. A denitrifying biological efficient phosphorus removal method applied to sewage treatment adopts an AAO sewage treatment method, and is characterized by comprising the following steps:
controlling the concentration of nitrate nitrogen at the tail end of the anaerobic zone through external reflux adjustment in the anaerobic zone;
secondly, ensuring an anoxic environment and controlling the concentration of nitrate nitrogen at the tail end of the anoxic zone through the control of DO concentration at an internal reflux point and reflux quantity in the anoxic zone;
and step three, setting an ammonia nitrogen control point close to the tail end of the aerobic tank, setting an internal control value, and optimizing the total aeration quantity.
2. The denitrification biological high-efficiency phosphorus removal method applied to sewage treatment of claim 1, wherein the concentration of nitrate nitrogen at the tail end of the anaerobic zone is less than 1 mg/L.
3. The denitrification biological efficient phosphorus removal method applied to sewage treatment of claim 1, wherein the concentration of nitrate nitrogen at the tail end of the anoxic zone is within the range of 1-3 mg/L.
4. The denitrification biological efficient phosphorus removal method applied to sewage treatment of claim 1, wherein the first step further comprises controlling the total phosphorus load of the anaerobic zone within the range of 0.016-0.08 gTP/gMLVSS.d, BOD/TP being more than or equal to 12, DO concentration being less than or equal to 0.2mg/L, and ORP being within the range of-100 to-225 mV.
5. The denitrification biological high-efficiency phosphorus removal method applied to sewage treatment of claim 1, wherein in the second step, the denitrification load of the anoxic zone is controlled within the range of 0.08-0.13 gTN/gMLVSS.d, the DO concentration is less than or equal to 0.2mg/L, and the ORP is within the range of-50-150 mV.
6. The efficient denitrification dephosphorization method applied to sewage treatment of claim 1, wherein ammonia nitrogen control points are arranged in the interval of 75-85% of the way near the end of the aerobic tank in the third step, an internal control value is set, the upper limit is set to be 45-55% of the ammonia nitrogen standard value, the lower limit is set to be 5-15% of the ammonia nitrogen standard value, the total aeration amount is optimized, and over-aeration is avoided.
7. The denitrification biological high-efficiency phosphorus removal method applied to sewage treatment according to claim 1, characterized in that the sludge load of the aerobic zone in the third step is controlled within the range of 0.1-0.25 kgCOD/kgMLVSS, the aeration mode adopts an alternate intermittent circulation mode, and the DO concentration along the process during aeration is controlled within the range of 0.5-1.5 mg/L.
8. The denitrification biological high-efficiency phosphorus removal method applied to sewage treatment of claim 1, wherein the three steps control the internal reflux ratio and the DO concentration of the internal reflux point; controlling the internal reflux to be in the range of 180-220%, wherein the DO concentration at the internal reflux point is less than 0.5 mg/L; the pH value of the aerobic zone is set to be 7.0-8.0, the sludge concentration MLVSS is kept at 2000-3000 mg/L, and the sludge age is suitable for 15-30 days.
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