CN111348744B - Method for controlling shortcut nitrification by using aeration rate and sludge concentration as two factors - Google Patents
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Abstract
The invention relates to a method for controlling short-cut nitrification by dual factors of aeration rate and sludge concentration, which adopts an anoxic/aerobic sequencing batch reactor, inoculates sludge with the concentration of 2000-2400mg/L into the anoxic/aerobic sequencing batch reactor, intermittently inputs ammonia nitrogen wastewater into the anoxic/aerobic sequencing batch reactor, and carries out short-cut nitrification treatment on the ammonia nitrogen wastewater under the aeration condition; in the aeration process, the aeration rate is 34-38L/h. Compared with the prior art, the invention regulates and controls the short-cut nitrification reaction system by two factors of aeration quantity and sludge concentration, analyzes the influence of the factors of aeration quantity and sludge concentration on the short-cut nitrification reaction system, researches the operation regulation and control optimization strategy of the short-cut nitrification reactor based on the above influence factors, realizes the high-efficiency and economic ammonia oxidation process, and has important engineering significance for the stable operation of the nitrosation process.
Description
Technical Field
The invention belongs to the technical field of high ammonia nitrogen wastewater treatment, and relates to a method for controlling shortcut nitrification by using two factors of aeration rate and sludge concentration.
Background
In recent years, new denitrification processes, anammox techniques, which have many advantages, have been widely studied, nitrite is generally produced by a nitrosation process as one of the substrates for anammox, and researchers have developed two types of new denitrification processes based on the reaction principle of nitrosation and anammox: one class is represented by SHARON-ANAMMOX (nitrosation-ANAMMOX), and nitrosation and ANAMMOX are respectively completed in two reactors; the other type is represented by CANON, and single-stage reaction of nitrosation and anaerobic ammoxidation is completed in one reactor. Numerous studies have shown that effective control of nitrosation, whether a two-stage process or a single-stage process, is always a major concern in the overall system.
Nitrosation, also known as shortcut nitrification, is the reaction of NH4 +Oxidation of-N to NO2 -N stage without further oxidation to NO3 -The process of-N, is typically performed by Ammonia Oxidizing Bacteria (AOB). AOB is an aerobic bacterium, and Dissolved Oxygen (DO) has a strong influence on growth and activity thereofIt has important effect. At present, during the operation of the short-cut nitrification reactor, the DO level in the reactor is often controlled only by adjusting the aeration quantity, and the influence of the sludge concentration factor is ignored. Studies have demonstrated that sludge concentration (MLSS) is one of the important factors affecting DO. The impact of MLSS is mainly reflected by two aspects: firstly, the sludge activity (specific oxygen consumption rate SOUR) is influenced by changing the liquid-phase oxygen mass transfer driving force; secondly, the oxygen mass transfer process is influenced by changing the quantity of sludge particles in the sewage, so that the aeration efficiency is influenced. Cellular respiration and wastewater modification can increase oxygen transport rates, but the presence of non-respiratory solids can impede the oxygen transfer process, presumably because the solid layer covering the surface of the bubbles reduces oxygen permeability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for controlling short-cut nitrification by using two factors, namely aeration quantity and sludge concentration. Therefore, the invention simultaneously researches the influence of two factors of aeration quantity and sludge concentration on the oxygen transfer rate.
The purpose of the invention can be realized by the following technical scheme:
a method for controlling short-cut nitrification by double factors of aeration rate and sludge concentration adopts an anoxic/aerobic sequencing batch reactor, sludge with the concentration of 2000-2400mg/L is inoculated in the anoxic/aerobic sequencing batch reactor, ammonia nitrogen wastewater is intermittently input into the anoxic/aerobic sequencing batch reactor, and short-cut nitrification treatment is carried out on the ammonia nitrogen wastewater under the aeration condition;
in the aeration process, the aeration rate is 34-38L/h.
Further, the sludge concentration is 2243 mg/L; in the aeration process, the aeration rate is 36L/h.
Further, the temperature in the anoxic/aerobic sequencing batch reactor is 32-34 ℃.
Further, the aeration process is as follows: the reactor is operated for 3 periods every day, and each period is 8 hours; in each period, feeding water for 10min, stirring for 20min under oxygen deficiency, aerating for 420min, standing for 20min, and draining for 10 min.
Further, in the starting stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is gradually increased from 35-45mg/L to 1000mg/L, and the water change ratio of the reactor is 0.25;
in the long-term operation stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is 450-550mg/L, and the water change ratio of the reactor is 0.5.
Further, except NH in the ammonia nitrogen wastewater4Besides Cl, the following components are also included: KHCO3To ensure NH in the ammonia nitrogen wastewater4 +With HCO3 -In a molar ratio of 1: 1; KH (Perkin Elmer)2PO4，0.025g/L；CaCl2，0.3g/L；MgSO4·7H2O，0.3g/L；FeSO4·7H2O，0.00625g/L；Na2EDTA, 0.00625 g/L; the microelement concentrate is 0.5 mL/L.
Further, the microelement concentrate comprises the following components: h3BO3，0.035g/L；CoCl2，0.525g/L；CuSO4·5H2O，0.625g/L；ZnSO4·7H2O，1.075g/L；MnCl2·4H2O，2.475g/L；NiCl2·6H2O，0.475g/L；NaMoO4·2H2O，0.55g/L；Na2EDTA，15g/L。
Furthermore, the anoxic/aerobic sequencing batch reactor intermittently feeds water through a peristaltic pump and intermittently discharges water through an automatic water outlet ball valve.
Furthermore, a liquid level meter and a stirring paddle are arranged in the anoxic/aerobic sequencing batch reactor, and the stirring speed of the stirring paddle is 130-.
Furthermore, the anoxic/aerobic sequencing batch reactor connects the constant temperature water bath kettle and the reactor water bath ring into a circulating system through an external peristaltic pump.
The invention researches the aeration rate and sludge concentration two-factor control shortcut nitrification process as follows: firstly, establishing an anoxic/aerobic sequencing batch reactor (AO-SBR) system with a nitrosation function; and secondly, determining the dissolved oxygen concentration, the ammonia oxidation rate and the aeration economy of the nitrosification system in the effective aeration stage under different sludge concentrations (100-. The short-cut nitrification reaction system is regulated and controlled by two factors of aeration quantity and sludge concentration, the influence of the factors of aeration quantity and sludge concentration on the short-cut nitrification reaction system is analyzed, the operation regulation and control optimization strategy of the short-cut nitrification reactor based on the above influencing factors is explored, the efficient and economic ammonia oxidation process is realized, and the method has important engineering significance for the stable operation of the nitrosation process.
Compared with the prior art, the invention has the following characteristics:
1) in the AO-SBR reactor, the MLSS is researched to be obviously positively correlated with the AAOE and to be obviously negatively correlated with the DO and the AOR. The sludge concentration is increased, which is beneficial for increasing the aeration economy AAOE, but the DO concentration and the AOB activity are reduced (influence: DO > AOR), slightly reducing the reactor VAOR.
2) In the AO-SBR reactor, the obvious positive correlation between aeration quantity (Qair) and DO, VAOR and AOR and the obvious negative correlation between the aeration quantity (Qair) and AAOE are researched. The aeration rate is increased, which is beneficial to increase DO concentration, reactor VAOR and AOB activity (influence: VAOR > DO > AOR), but reduces the aeration economy AAOE.
3) In the AO-SBR reactor, the control conditions of aeration amount of 36L/h and MLSS 2243mg/L are comprehensively considered as the optimal control strategy in the experimental system within the range of aeration amount (12-60L/h) and MLSS (100-2243 mg/L).
4) The invention relates to aeration quantity and sludge concentration dual-factor control short-cut nitrification, analyzes the influence of the aeration quantity and sludge concentration factors on a short-cut nitrification reaction system, and provides reference for optimizing the operation of a nitrosation reactor through a redundancy analysis method.
Drawings
FIG. 1 is a schematic view of the anoxic/aerobic sequencing batch reactor according to the present invention;
FIG. 2 is a graph showing the variation of the triple nitrogen concentration, nitrite accumulation rate (NAE), nitrite conversion rate (NCE) (a), influent ammonia nitrogen load (ALR), ammonia nitrogen removal rate (ARE), and total inorganic nitrogen removal rate (TINRE) (b) at the start-up stage of the AO-SBR reactor in the reaction process of the present invention;
FIG. 3 is a graph showing the changes of the triple nitrogen concentration, NAE, NCE (a), and ALR, ARE, TINRE (b) in the long-term operation phase of the AO-SBR reactor in the reaction process of the present invention;
FIG. 4 is a graph showing the change in Tri-Nitrogen, pH, DO, FA and FNA in a single cycle on day 13 of the AO-SBR reactor during the reaction of the present invention;
FIG. 5 is an RDA analysis chart of aeration amount + sludge concentration and the indexes of effective aeration period according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
in the embodiment, the short-cut nitrification reaction system is regulated and controlled by two factors of aeration quantity and sludge concentration. Specifically, the method comprises the steps of analyzing the influence of factors of aeration amount and sludge concentration on a short-cut nitrification reaction system by calculating the change law of parameters such as three nitrogen, pH, Dissolved Oxygen (DO) concentration, Volumetric Ammonia Oxidation Rate (VAOR), Ammonia Oxidation Rate (AOR), aeration ammonia oxidation rate (AAOE) and the like in a single period at the effective aeration stage of an AO-SBR reactor in an 'pre-anoxic + aeration' operation mode under different aeration amounts and sludge concentrations, and researching an operation regulation and control optimization strategy of the short-cut nitrification reactor based on the influence factors.
In order to achieve the above purpose, the inoculated sludge in this example is CANON sludge stored in a refrigerator at 4 ℃, i.e. sludge mixed with shortcut nitrification and anaerobic ammonium oxidation, and an anoxic/aerobic sequencing batch reactor (AO-SBR) is used, and is soaked and washed with clean water for three times before inoculation. Parameters such as single-cycle three-nitrogen, pH, DO, VAOR, AOR, AAOE and the like at each experimental stage are measured.
The experimental water adopts artificially prepared wastewater. The main components are as follows (g/L): NH (NH)4Cl (prepared as required), KHCO3(prepared as required); KH (Perkin Elmer)2PO4，0.025；CaCl2，0.3；MgSO4·7H2O，0.3；FeSO4·7H2O，0.00625；Na2EDTA, 0.00625 and trace elementsThe concentrated solution was 0.5 mL/L.
Wherein the microelement concentrate comprises (g/L): h3BO3，0.035；CoCl2，0.525；CuSO4·5H2O，0.625；ZnSO4·7H2O，1.075；MnCl2·4H2O，2.475；NiCl2·6H2O，0.475；NaMoO4·2H2O，0.55；Na2EDTA，15。
The reactor was started and tested for changes in trinitrogen, pH, DO, FA, and FNA during a single cycle of the 13 th day reactor run. Typical laws for the variation of each parameter within a single cycle of the reactor can be obtained (as shown in figure 4). In about 25-205 min, the reactor is in an 'effective aeration stage'. At this time, DO levels stabilized at low levels (0.26. + -. 0.01mg/L) and aeration was constant, indicating that AOB activity and its oxygen consumption rate were stable.
The FNA is gradually accumulated along with the reduction of pH and the accumulation of nitrite nitrogen, the pH is reduced to 6.74 about 205min, the FNA is increased to 0.33mg/L, and the variable range (0.42-1.72 mg/L) of AOB inhibitory concentration is reached. At this point the AOB activity and its oxygen consumption rate begin to be inhibited, the oxygen consumption rate is less than the oxygen supply rate and DO rises rapidly. But the ammoxidation reaction continues and thus the pH continues to drop. In this experiment, pH was reduced to a minimum of 6.29 at about 250min, AOB activity was severely inhibited, and DO rapidly climbed to 3.89 mg/L. At the moment, the contribution of aeration to ammonia nitrogen oxidation is gradually weakened, and the oxygen concentration is shown to be increased in a dissolved state, so that the DO sudden-change period of 205-250 min is called as an 'aeration transition period'.
Then, the ammonia oxidation activity of the AOB is almost completely inhibited by low pH (less than 6.45) and high FNA (more than 0.42mg/L) in a period of 250-450 min, and the aeration contributes slightly to the ammonia oxidation reaction, so that the high DO platform period can be called as an 'ineffective aeration period'.
Linear fitting is carried out on each point of ammonia nitrogen concentration changing along with time in the effective aeration stage to obtain slope k, wherein the unit of the slope k is mg N/(L.min), and the unit of the slope k is converted to obtain Volume Ammonia Oxidation Rate (VAOR), and the unit of the slope k is kg N/(m.min)3D) characterizing the reactor ammoxidation rate. VAOR and the concentration of volatile sludge in the reactor (MLV)SS) was converted into units of Ammonia Oxidation Rate (AOR), which was expressed as specific activity of AOB in kg of N/(kg of vss. d). The Aerated Ammonia Oxidation Efficiency (AAOE) represents the amount of ammonia nitrogen that can be oxidized in the reactor by the air fed in g N/(m)3air) to characterize the aeration economy of the shortcut nitrification reactor, the calculation formula is as follows:
in the formula VAO-SBRThe effective volume of the AO-SBR reactor is expressed, and the volume is 2L in the experiment; qairIndicates the aeration rate in L/h.
Taking a sludge representative of a seed sludge sample on the 0 th day of the operation of the reactor, and taking a sludge representative of a short-cut nitrified sludge sample after long-term acclimation on the 231 th day. The high-throughput sequencing result shows that AOB in the AO-SBR short-cut nitrification reactor is mainly of the genus Nitrosomonas, and the relative abundance of the AOB is increased from 12.95 percent in the seed sludge to 21.82 percent through long-term domestication. 6.09% Candidatus _ Kuenenia and 2.89% Candidatus _ Brocadia exist in the seed mud, the AnAOB bacteria both reduce the relative abundance to below 1% after long-term domestication, and NOB related bacteria are not found.
The specific process comprises the following steps:
first step, start-up and operation control of AO-SBR reactor
The effective volume of the anoxic/aerobic sequencing batch reactor (AO-SBR) used in the experiment is 2L, and the water change ratio is set to be 0.25 or 0.5 according to the experiment requirement. As shown in figure 1, the reactor intermittently feeds water through a peristaltic pump, the water inlet amount is controlled by a liquid level meter 5, and the intermittent water outlet is realized by an automatic water outlet ball valve 4. The device is internally provided with a stirring paddle 3, the stirring speed is controlled at 150rpm, and the bottom of the device is provided with an aeration head 1 for aeration. The constant temperature water bath kettle and the reactor water bath ring 2 are connected into a circulating system through an external peristaltic pump, and the temperature of the working area of the reactor is controlled to be about 33 +/-1 ℃. The reactor is operated for 3 periods every day, wherein 1 period is 8h, water is fed for 10min, oxygen-deficient stirring is carried out for 20min, aeration is carried out for 420min, standing and precipitation are carried out for 20min, water is drained for 10min, and the reactor is left unused for 5 min.
Stage I reactor start-up stage: firstly, adopting a lower ammonia nitrogen concentration (about 40mg/L) of inlet water, and then gradually increasing the ammonia nitrogen concentration to 500 +/-50 mg/L to gradually recover the AOB activity; and the running capacity of the reactor in a high ammonia nitrogen environment is tested, and the ammonia nitrogen concentration of the inlet water is increased to about 1000mg/L at the 18 th day. The reactor is started up by changing the water ratio by 0.25, the short-cut nitrification process is successfully started up after 49 days of operation, and the operation effect is shown in the attached figure 2.
Stage ii the reactor was run for a long time: on day 50, the reactor water change ratio was doubled to 0.5, while the feed ammonia nitrogen concentration was reduced by half to about 500 mg/L. After stabilization, the ammonia nitrogen load ALR of the inlet water is kept at 0.7kg N/(m)3D) about, the average reactor effluent NO2 --N is 220 +/-10 mg N/L, and effluent NO3 -N is 10 +/-5 mg N/L, and the average accumulation rate of nitrite is 95 percent on average. Thus, the success of establishing a stable nitrosation system is demonstrated, the reactor of the present invention was operated for 216 days under the feed conditions, and the operation results are shown in FIG. 3.
Secondly, determining the influence of two factors of aeration quantity and sludge concentration on the short-cut nitrification and ammonia oxidation performance
The reactor is operated for 102 days, and after a stable operation stage is reached, in order to explore the influence of two factors, namely aeration quantity and sludge concentration, on the ammonia oxidation performance of the shortcut nitrification reactor, single-period tests are carried out by adopting different aeration quantity (12-60L/h) and MLSS (100-2243mg/L) levels. MLSS is kept at about 2000mg/L in the operation process of the reactor, when MLSS needs to be reduced in certain single-cycle tests, part of activated sludge in the reactor is temporarily removed before the test cycle begins, then a certain volume of sludge mixed liquor is taken at the end of the test cycle to measure the concentration of MLSS and MLVSS, and sludge discharged in advance is poured back to the reactor after the test cycle is finished so as to reduce interference on the operation of the reactor. The results are shown in Table 1.
TABLE 1 operating parameters of the AO-SBR reactor for the single-cycle effective aeration phase
Maximum effective aeration period DO (1.81mg/L) and AOR [12.86kg N/(kg vss. d)]Both appear under the conditions of the highest aeration amount (60L/h) and the lowest sludge concentration (100mg/L) (i.e., experiment No. 11), indicating that the AOB activity is the best under these conditions, but the AAOE index, which characterizes the aeration economy, is also reduced to the lowest level [1.31g N/(m/L) ]3 air)]. In contrast, the highest AAOE occurs at the lowest aeration rate (12L/h) (i.e., experiment number 1), but at this time the effective aeration period DO is even lower than 0.1mg/L, the low DO minimizes AOB activity and the AOR is only 0.43kg N/(kg vss. d).
Redundancy analysis (RDA) is a ranking method combining regression analysis with principal component analysis, and is an extension of multiresonance regression analysis. It combines the correspondence analysis and the multiple regression analysis, and analyzes the cause of the variation of the original variable through the correlation between the original variable and the typical variable. The RDA establishes a linear regression model with the representative variables as independent variables and the original variables as dependent variables to reflect the relationship between the target values and the variables. In order to more visually represent the correlation between two factors of aeration quantity and sludge concentration and four indexes of DO, VAOR, AOR and AAOE in a single-period effective aeration stage, the RDA is carried out on the data in the table 1 by taking aeration quantity (12-60L/h) and MLSS (100-2243mg/L) of different levels as independent variables and taking four indexes of DO, VAOR, AOR and AAOE as dependent variables, and the result is shown in the attached figure 5. And (3) projecting from each index arrow (hollow) to the direction of an independent variable arrow (solid), wherein the distance between the projection and the origin represents the influence degree of the independent variable on the index, and the larger the projection length is, the larger the influence degree is. In addition, the correlation between the variables is judged according to the included angle between the indicator arrow and the independent variable arrow: if the included angle is smaller than 90 degrees, positive correlation influence is represented, and the smaller the angle is, the larger the positive correlation is; an included angle greater than 90 represents a negative correlation effect, and the larger the angle, the greater the negative correlation. If the angle is close to 90 deg., there is little effect of the two variables on each other.
As can be seen from FIG. 5, aeration (Qair) is clearly positively correlated with DO, VAOR and AOR and clearly negatively correlated with AAOE. In other words, the aeration rate is increased, which is beneficial to increase the DO concentration, the reactor VAOR and the AOB activity (effect: VAOR > DO > AOR), but will decrease the aeration economy AAOE. MLSS is obviously positively correlated with AAOE and is obviously negatively correlated with DO and AOR, but the included angle between the MLSS and the AOR is slightly larger than 90 degrees, and the projection length VAOR in the MLSS direction is shorter than that of the DO and the AOR. This indicates that the sludge concentration is increased, which is beneficial for increasing the aeration economy AAOE, but that the DO concentration and the AOB activity are decreased (influence: DO > AOR), slightly decreasing the reactor VAOR.
In the range of aeration amount (12-60L/h) and MLSS (100-2243mg/L) in the experiment, the reduction of MLSS concentration is beneficial to improving DO, AOR and VAOR, but when the MLSS is too low, the aeration amount needs to be increased to maintain the operation effect of the reactor, so that the reduction of MLSS is not beneficial to improving AAOE (aeration economy). Although the reduction of aeration amount and the increase of MLSS are beneficial to the improvement of aeration economy, the reduced DO and AOR are considered, and the enough volume ammonia oxidation rate VAOR is ensured to bear the actual ammonia nitrogen load ALR (about 0.6-0.8 kg N/(m) of the reactor3·d)]So as to achieve the purpose of ending the effective aeration period before the aeration is finished. Research shows that the aeration performance reaches the maximum when the sludge amount is 2000-3000 mg/L, so that the control strategy of the experiment number 7 under the experimental condition is better (the aeration amount is 36L/h and MLSS 2243mg/L) by combining the data in the table 1.
Example 2:
firstly, establishing a nitrosation process system
1. CANON sludge stored in a 4 ℃ refrigerator is inoculated into an anoxic/aerobic sequencing batch reactor (AO-SBR) with an effective volume of 2L, and the sludge is soaked and washed for three times by clear water before inoculation.
2. And determining the operation mode of the AO-SBR reactor, intermittently feeding water into the reactor through a peristaltic pump, controlling the water feeding amount by a liquid level meter, and realizing intermittent water outlet by using an automatic water outlet ball valve. The stirring paddle is arranged in the device, and the stirring speed is controlled at 150 rpm. The constant-temperature water bath kettle and the reactor water bath ring are connected into a circulating system through an external peristaltic pump, and the temperature of a working area of the reactor is controlled to be about 33 +/-1 ℃. The reactor is operated for 3 periods in 1 day, wherein 1 period is 8h, water is fed for 10min, anoxic stirring is carried out for 20min, aeration is carried out for 420min, standing and precipitation are carried out for 20min, water is drained for 10min, and the reactor is left unused for 5 min. The water change ratio was set to 0.25 or 0.5 according to experimental requirements.
3. The reactor start-up phase: firstly, adopting a lower ammonia nitrogen concentration (about 40mg/L) of inlet water, and then gradually increasing the ammonia nitrogen concentration to 500 +/-50 mg/L to gradually recover the AOB activity; and the running capacity of the reactor in a high ammonia nitrogen environment is tested, and the ammonia nitrogen concentration of the inlet water is increased to about 1000mg/L at the 18 th day. In the starting stage of the reactor, the water ratio is changed by 0.25, the operation is carried out for 49 days, and the short-cut nitrification process is successfully started.
4. The reactor is operated for a long time: on day 50, the reactor water change ratio was doubled to 0.5, while the feed ammonia nitrogen concentration was reduced by half to about 500 mg/L. After stabilization, the ammonia nitrogen load ALR of the inlet water is kept at 0.7kg N/(m)3D) about, the average reactor effluent NO2 --N is 220 +/-10 mg N/L, and effluent NO3 -N is 10 +/-5 mg N/L, and the average accumulation rate of nitrite is 95 percent on average. This indicates that the establishment of a stable nitrosation system was successful and the reactor was run for 216 days at this feed condition.
Secondly, determining aeration quantity and sludge concentration two factors to control the change of each parameter of the shortcut nitrification process
The reactor is operated for 102 days, and after a stable operation stage is reached, in order to explore the influence of two factors, namely aeration quantity and sludge concentration, on the ammonia oxidation performance of the shortcut nitrification reactor, single-period tests are carried out by adopting different aeration quantity (12-60L/h) and MLSS (100-2243mg/L) levels.
Example 3:
a method for controlling short-cut nitrification by double factors of aeration rate and sludge concentration adopts an anoxic/aerobic sequencing batch reactor, sludge with the concentration of 2243mg/L is inoculated in the anoxic/aerobic sequencing batch reactor, ammonia nitrogen wastewater is intermittently input into the anoxic/aerobic sequencing batch reactor, and short-cut nitrification treatment is carried out on the ammonia nitrogen wastewater under the aeration condition; in the aeration process, the aeration rate is 36L/h.
The temperature in the anoxic/aerobic sequencing batch reactor was 33 ℃.
The aeration process is as follows: the reactor operates for 3 periods every day, each period is 8h, wherein, water is fed for 10min, oxygen-deficient stirring is carried out for 20min, aeration is carried out for 420min, standing and sedimentation are carried out for 20min, and water is drained for 10 min.
In the starting stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is gradually increased from 40mg/L to 1000mg/L, and the water change ratio of the reactor is 0.25; in the long-term operation stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of the inlet water is 500mg/L, and the water change ratio of the reactor is 0.5.
Ammonia nitrogen wastewater except NH4Besides Cl, the following components are also included: KHCO3To ensure NH in the ammonia nitrogen wastewater4 +With HCO3 -In a molar ratio of 1: 1; KH (Perkin Elmer)2PO4，0.025g/L；CaCl2，0.3g/L；MgSO4·7H2O，0.3g/L；FeSO4·7H2O，0.00625g/L；Na2EDTA, 0.00625 g/L; the microelement concentrate is 0.5 mL/L. The microelement concentrate comprises the following components: h3BO3，0.035g/L；CoCl2，0.525g/L；CuSO4·5H2O，0.625g/L；ZnSO4·7H2O，1.075g/L；MnCl2·4H2O，2.475g/L；NiCl2·6H2O，0.475g/L；NaMoO4·2H2O，0.55g/L；Na2EDTA，15g/L。
The anoxic/aerobic sequencing batch reactor intermittently feeds water through a peristaltic pump and intermittently discharges water through an automatic water outlet ball valve. A liquid level meter and a stirring paddle are arranged in the anoxic/aerobic sequencing batch reactor, and the stirring speed of the stirring paddle is 130-170 rpm. The anoxic/aerobic sequencing batch reactor connects the constant temperature water bath kettle and the reactor water bath ring into a circulating system through an external peristaltic pump.
Example 4:
a method for controlling short-cut nitrification by double factors of aeration rate and sludge concentration adopts an anoxic/aerobic sequencing batch reactor, sludge with the concentration of 2000mg/L is inoculated in the anoxic/aerobic sequencing batch reactor, ammonia nitrogen wastewater is intermittently input into the anoxic/aerobic sequencing batch reactor, and short-cut nitrification treatment is carried out on the ammonia nitrogen wastewater under the aeration condition; in the aeration process, the aeration rate is 34L/h.
The sludge concentration is 2243 mg/L; in the aeration process, the aeration rate is 36L/h.
The temperature in the anoxic/aerobic sequencing batch reactor was 32 ℃.
The aeration process is as follows: the reactor operates for 3 periods every day, each period is 8h, wherein, water is fed for 10min, oxygen-deficient stirring is carried out for 20min, aeration is carried out for 420min, standing and sedimentation are carried out for 20min, and water is drained for 10 min.
In the starting stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is gradually increased from 35mg/L to 1000mg/L, and the water change ratio of the reactor is 0.25; in the long-term operation stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is 450mg/L, and the water change ratio of the reactor is 0.5.
Ammonia nitrogen wastewater except NH4Besides Cl, the following components are also included: KHCO3To ensure NH in the ammonia nitrogen wastewater4 +With HCO3 -In a molar ratio of 1: 1; KH (Perkin Elmer)2PO4，0.025g/L；CaCl2，0.3g/L；MgSO4·7H2O，0.3g/L；FeSO4·7H2O，0.00625g/L；Na2EDTA, 0.00625 g/L; the microelement concentrate is 0.5 mL/L. The microelement concentrate comprises the following components: h3BO3，0.035g/L；CoCl2，0.525g/L；CuSO4·5H2O，0.625g/L；ZnSO4·7H2O，1.075g/L；MnCl2·4H2O，2.475g/L；NiCl2·6H2O，0.475g/L；NaMoO4·2H2O，0.55g/L；Na2EDTA，15g/L。
The anoxic/aerobic sequencing batch reactor intermittently feeds water through a peristaltic pump and intermittently discharges water through an automatic water outlet ball valve. A liquid level meter and a stirring paddle are arranged in the anoxic/aerobic sequencing batch reactor, and the stirring speed of the stirring paddle is 130 rpm. The anoxic/aerobic sequencing batch reactor connects the constant temperature water bath kettle and the reactor water bath ring into a circulating system through an external peristaltic pump.
Example 5:
a method for controlling short-cut nitrification by double factors of aeration rate and sludge concentration adopts an anoxic/aerobic sequencing batch reactor, sludge with the concentration of 2400mg/L is inoculated in the anoxic/aerobic sequencing batch reactor, ammonia nitrogen wastewater is intermittently input into the anoxic/aerobic sequencing batch reactor, and short-cut nitrification treatment is carried out on the ammonia nitrogen wastewater under the aeration condition; in the aeration process, the aeration rate is 38L/h.
The sludge concentration is 2243 mg/L; in the aeration process, the aeration rate is 36L/h.
The temperature in the anoxic/aerobic sequencing batch reactor was 34 ℃.
The aeration process is as follows: the reactor operates for 3 periods every day, each period is 8h, wherein, water is fed for 10min, oxygen-deficient stirring is carried out for 20min, aeration is carried out for 420min, standing and sedimentation are carried out for 20min, and water is drained for 10 min.
In the starting stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is gradually increased from 45mg/L to 1000mg/L, and the water change ratio of the reactor is 0.25; in the long-term operation stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is 550mg/L, and the water change ratio of the reactor is 0.5.
Ammonia nitrogen wastewater except NH4Besides Cl, the following components are also included: KHCO3To ensure NH in the ammonia nitrogen wastewater4 +With HCO3 -In a molar ratio of 1: 1; KH (Perkin Elmer)2PO4，0.025g/L；CaCl2，0.3g/L；MgSO4·7H2O，0.3g/L；FeSO4·7H2O，0.00625g/L；Na2EDTA, 0.00625 g/L; the microelement concentrate is 0.5 mL/L. The microelement concentrate comprises the following components: h3BO3，0.035g/L；CoCl2，0.525g/L；CuSO4·5H2O，0.625g/L；ZnSO4·7H2O，1.075g/L；MnCl2·4H2O，2.475g/L；NiCl2·6H2O，0.475g/L；NaMoO4·2H2O，0.55g/L；Na2EDTA，15g/L。
The anoxic/aerobic sequencing batch reactor intermittently feeds water through a peristaltic pump and intermittently discharges water through an automatic water outlet ball valve. A liquid level meter and a stirring paddle are arranged in the anoxic/aerobic sequencing batch reactor, and the stirring speed of the stirring paddle is 170 rpm. The anoxic/aerobic sequencing batch reactor connects the constant temperature water bath kettle and the reactor water bath ring into a circulating system through an external peristaltic pump.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. A method for controlling short-cut nitrification by double factors of aeration rate and sludge concentration is characterized in that an anoxic/aerobic sequencing batch reactor is adopted, sludge with the concentration of 100-;
the sludge is activated sludge;
in the aeration process, the aeration rate is 12-60L/h;
the aeration process is as follows: the reactor is operated for 3 periods every day, and each period is 8 hours; in each period, feeding water for 10min, stirring for 20min under oxygen deficiency, aerating for 420min, standing for 20min, precipitating, and draining for 10 min;
in the starting stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is gradually increased from 35-45mg/L to 1000mg/L, and the water change ratio of the reactor is 0.25;
in the long-term operation stage of the short-cut nitrification treatment, the ammonia nitrogen concentration of inlet water is 450-550mg/L, and the water change ratio of the reactor is 0.5;
regulating and controlling a short-cut nitrification reaction system by two factors of aeration quantity and sludge concentration, and selecting better control parameters by a redundancy analysis method; the sludge concentration is increased, which is beneficial to increasing the aeration economy, but can reduce the dissolved oxygen concentration, the activity of ammonia oxidizing bacteria and the volume ammonia oxidizing rate of the reactor; the aeration rate is increased, which is beneficial to increasing the dissolved oxygen concentration, the reactor volume ammonia oxidation rate and the activity of ammonia oxidizing bacteria, but the aeration economy is reduced.
2. The aeration rate and sludge concentration two-factor control shortcut nitrification method according to claim 1, wherein the control strategy after operation regulation and control optimization is as follows: the sludge concentration is 2243 mg/L; in the aeration process, the aeration rate is 36L/h.
3. The method for aeration rate and sludge concentration dual-factor control shortcut nitrification of claim 1, wherein the temperature in the anoxic/aerobic sequencing batch reactor is 32-34 ℃.
4. The method for controlling shortcut nitrification by using two factors of aeration amount and sludge concentration as claimed in claim 1, wherein the ammonia nitrogen wastewater is treated except NH4Besides Cl, the following components are also included: KHCO3To ensure NH in the ammonia nitrogen wastewater4 +With HCO3 -In a molar ratio of 1: 1; KH (Perkin Elmer)2PO4，0.025g/L；CaCl2，0.3g/L；MgSO4·7H2O，0.3g/L；FeSO4·7H2O，0.00625g/L；Na2EDTA, 0.00625 g/L; the microelement concentrate is 0.5 mL/L.
5. The method for controlling shortcut nitrification by using two factors of aeration amount and sludge concentration as claimed in claim 4, wherein the microelement concentrate comprises the following components: h3BO3，0.035g/L；CoCl2，0.525g/L；CuSO4·5H2O，0.625g/L；ZnSO4·7H2O，1.075g/L；MnCl2·4H2O，2.475g/L；NiCl2·6H2O，0.475g/L；NaMoO4·2H2O，0.55g/L；Na2EDTA，15g/L。
6. The method for controlling short-cut nitrification by using two factors, namely aeration rate and sludge concentration, as claimed in claim 1, wherein the anoxic/aerobic sequencing batch reactor intermittently feeds water by a peristaltic pump and intermittently discharges water by an automatic water outlet ball valve.
7. The method of claim 1, wherein a liquid level meter and a stirring paddle are arranged in the anoxic/aerobic sequencing batch reactor, and the stirring speed of the stirring paddle is 130-170 rpm.
8. The method for controlling shortcut nitrification by dual factors of aeration rate and sludge concentration as claimed in claim 1, wherein the anoxic/aerobic sequencing batch reactor connects the constant temperature water bath kettle and the reactor water bath ring into a circulating system by an external peristaltic pump.
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