Method and device for measuring the effective specific surface area of suspended carrier fillings in a moving-bed biofilm reactor

Abstract

The application discloses a kind of mobile bed biological membrane reactor suspended carrier filler effective specific surface area measurement method and device, belong to the technical field of mobile bed biological membrane reactor, including obtaining respectively loaded with known effective specific surface area suspended carrier filler and loaded with the required parameter value of reactor of effective specific surface area suspended carrier filler to be measured;When the nitrification rate value of the reactor loaded with known effective specific surface area suspended carrier filler and loaded with effective specific surface area suspended carrier filler to be measured reaches maximum, the required parameter value of reactor obtained and the effective specific surface area value of the known effective specific surface area suspended carrier filler are calculated by model, obtain the effective specific surface area value of the effective specific surface area suspended carrier to be measured.The measurement method and device of the application can improve the measurement accuracy of suspended carrier filler effective specific surface area.

Description

Technical Field

[0001] This invention relates to the field of moving bed biofilm reactor technology, and in particular to a method and apparatus for measuring the effective specific surface area of ​​suspended carrier packing material in a moving bed biofilm reactor. Background Technology

[0002] Moving-bed biofilm reactors (MBBRs) are currently among the most efficient equipment for wastewater treatment. They use specially designed resins as biofilm carriers (such as polyethylene resin and polypropylene resin), and utilize water or air flow to keep the carrier packing in a fluidized state. The biofilm on the surface of the suspended carrier packing adsorbs, oxidizes, and decomposes pollutants, thereby purifying the wastewater.

[0003] MBBRs typically need to be designed based on the surface load of the suspended carrier packing material. This is because the treatment performance of biofilms grown on the surface of suspended carrier packing materials is limited by mass transfer, which is closely related to the biofilm surface area. Designing based on surface load directly yields the required biofilm area for the system. Then, the effective specific surface area of ​​the suspended carrier packing material is used for selection, ultimately determining the volume of a specific type of suspended carrier packing material.

[0004] Due to the inherent structure of suspended carrier packing materials and the hydraulic characteristics of the system, certain areas cannot accumulate biofilm. Therefore, the surface loading value is based on the effective specific surface area, not the total specific surface area. The effective specific surface area refers to the protected surface area per unit volume of suspended carrier packing material where good mass and oxygen transfer can be achieved, and where effective microorganisms can grow. It is typically the inner and outer walls of the internal structure of the suspended carrier packing material, as well as the recesses of the external gear-shaped protrusions. The effective specific surface area generally accounts for 0.6-0.9% of the total specific surface area and is closely related to the product itself. Therefore, if the total specific surface area is used instead of the effective specific surface area, there is a risk of insufficient effective biofilm area and substandard effluent. Thus, determining the effective specific surface area provides a basis for selecting suspended carrier packing materials.

[0005] Currently, the main method for measuring the effective specific surface area of ​​suspended carrier packing materials is the geometric method. The standard "High-Density Polyethylene Suspended Carrier Packing Materials for Water Treatment (CJ / T 461—2014)" states that, based on the different structural shapes of the suspended carrier packing materials, the effective surface area is divided into several parts. The relevant dimensions of each part are measured separately, the average value is calculated, and the effective surface area of ​​each part is calculated. These parts are then summed to obtain the total effective surface area of ​​a single packing material. Multiplying this total effective surface area by the minimum number of packing materials per unit volume yields the minimum effective specific surface area of ​​the packing material. However, due to the small size of suspended carrier packing materials, the cumulative error in the geometric dimensions of individual parts may introduce a larger error into the measurement of the effective specific surface area.

[0006] CN111929217A proposes a method for determining the effective specific surface area of ​​porous organic packing. The method uses the bulk density of the suspended carrier, the material density, and the average wall thickness to determine the total specific surface area, and then calculates the effective specific surface area. However, this method requires dividing the suspended carrier packing into sections and measuring the thickness and length of the sampled sections. Even after summing, there is still a large measurement error.

[0007] Therefore, to address the problem of significant errors in the measurement of effective specific surface area in existing technologies, it is necessary to improve them to make the measured specific surface area of ​​suspended carrier fillers more accurate. Summary of the Invention

[0008] To improve the accuracy of measuring the effective specific surface area of ​​suspended carrier packings, this invention provides a method and apparatus for measuring the effective specific surface area of ​​suspended carrier packings in a moving bed biofilm reactor.

[0009] The present invention provides a method for measuring the effective specific surface area of ​​suspended carrier packing material in a moving bed biofilm reactor, comprising the following steps:

[0010] To obtain the required parameter values ​​for reactors loaded with suspended carrier packing material of known effective specific surface area and reactors loaded with suspended carrier packing material of unknown effective specific surface area;

[0011] When the nitrification rate of the reactors carrying the known effective specific surface area suspended carrier packing and the reactors carrying the effective specific surface area to be tested reaches its maximum, the required parameter values ​​of the reactors carrying the known effective specific surface area suspended carrier packing and the reactors carrying the effective specific surface area to be tested, as well as the effective specific surface area value of the known effective specific surface area suspended carrier packing, are obtained through model calculation to obtain the effective specific surface area value of the effective specific surface area suspended carrier to be tested.

[0012] Furthermore, before calculating the effective specific surface area value of the suspended carrier to be tested, the maximum nitrification rate value of the known effective specific surface area suspended carrier is obtained by model calculation based on the required parameter values ​​of the reactor carrying the known effective specific surface area suspended carrier packing and the effective specific surface area value of the known effective specific surface area suspended carrier packing.

[0013] The effective specific surface area value of the suspended carrier to be tested is obtained by model calculation based on the maximum nitrification rate value and the required parameter values ​​of the reactor carrying the suspended carrier packing material with the effective specific surface area to be tested.

[0014] Furthermore, the required parameters for the reactors containing suspended carrier packing material with known effective specific surface area and those containing suspended carrier packing material with a known effective specific surface area include the influent ammonia nitrogen concentration. Ammonia nitrogen concentration in effluent Inlet flow rate Q Inf V and the filling rate f of the suspended carrier packing meida ,

[0015] The model is as follows:

[0016]

[0017] In the formula, r NH3 α represents the nitrification rate of the reactor, and α represents the effective specific surface area of ​​the suspended carrier packing.

[0018] Furthermore, the model is optimized as follows:

[0019]

[0020] In the formula, α2 is the effective specific surface area of ​​the suspended carrier packing material to be tested. and V2 and Q represent the influent and effluent ammonia nitrogen concentrations of the reactor containing the suspended packing material to be tested. Inf2 f represents the volume of the reactor containing the suspended packing material to be tested and the influent flow rate. media2 α1 represents the filling ratio of the suspended carrier packing in the reactor containing the suspended carrier packing to be tested; α1 represents the effective specific surface area of ​​the known suspended carrier packing. and Given the influent and effluent ammonia nitrogen concentrations of the reactor containing the suspended carrier packing material, V1 and Q... Inf1 Given the volume of the reactor containing the suspended carrier packing and the influent flow rate, f media1 The filling rate of the suspended carrier packing in the reactor is known.

[0021] Furthermore, the nitrification rate of the reactors carrying suspended carrier packing with known effective specific surface area and those carrying suspended carrier packing with a known effective specific surface area is assessed by adjusting the ammonia nitrogen load.

[0022] Furthermore, the ammonia nitrogen load adjustment strategy is as follows:

[0023] The ammonia nitrogen concentration in the effluent of the reactors loaded with suspended carrier packing material of known effective specific surface area and those loaded with suspended carrier packing material of unknown effective specific surface area was determined.

[0024] If the effluent ammonia nitrogen concentration is ≤2 mg / L in at least three consecutive measurements, the influent ammonia nitrogen load should be increased by 10% to 20%.

[0025] If the effluent ammonia nitrogen concentration is >2 mg / L in at least three consecutive measurements, the influent ammonia nitrogen load should be maintained or reduced.

[0026] Furthermore, the ammonia nitrogen load is adjusted by changing the influent ammonia nitrogen concentration, influent flow rate, and / or the filling rate of the suspended carrier packing in the reactors carrying suspended carrier packing with known effective specific surface area and those carrying suspended carrier packing with a known effective specific surface area.

[0027] Furthermore, when the effluent ammonia nitrogen concentration of the reactor containing the known effective specific surface area suspended carrier packing material and the reactor containing the effective specific surface area to be measured suspended carrier packing material is stably <2 mg / L, the nitrification rate of the reactor containing the known effective specific surface area suspended carrier packing material and the reactor containing the effective specific surface area to be measured suspended carrier packing material reaches its maximum value.

[0028] Furthermore, the reactors carrying suspended carrier packing with known effective specific surface area and those carrying suspended carrier packing with a measured effective specific surface area have the same reaction temperature and dissolved oxygen concentration.

[0029] Furthermore, the reactors containing suspended carrier packing material with known effective specific surface area and suspended carrier packing material with undetermined effective specific surface area are used to carry out the reaction with synthetic wastewater.

[0030] The present invention provides a device for measuring the effective specific surface area of ​​suspended carrier packing in a moving bed biofilm reactor, comprising at least one reactor for loading suspended carrier packing with a known effective specific surface area and at least one reactor for loading suspended carrier packing with an effective specific surface area to be measured. The inlet ends of the plurality of reactors are connected to a common inlet tank. The inlet end is located at the lower part of the reactor, and the outlet end is located at the upper part of the reactor. The inlet tank delivers water to be treated into the reactor through an inlet pump.

[0031] Furthermore, each outlet end of the reactor is individually connected to an outlet tank for flow calibration.

[0032] Furthermore, the reactor includes a reactor body, and the sidewalls of the reactor body include a temperature-controlled layer.

[0033] Furthermore, the sidewall of the reactor body is hollow to form a chamber, the lower part of the chamber is provided with a second water inlet for input of a constant temperature source, and the upper part of the chamber is provided with a second water outlet for output of a constant temperature source.

[0034] Furthermore, the reactor includes an aeration assembly.

[0035] Furthermore, the aeration assembly includes an aeration head disposed inside the reactor and an aeration inlet pipe disposed on the reactor and connected to the aeration head, and a plurality of the aeration inlet pipes are connected to an aeration pump.

[0036] The method and apparatus for measuring the effective specific surface area of ​​suspended carrier packing in a moving bed biofilm reactor provided by this invention have the following beneficial effects:

[0037] 1. By using a suspended carrier packing material with a known effective specific surface area as a reference, and placing the suspended carrier packing material with a known effective specific surface area and the suspended carrier packing material with an unknown effective specific surface area in separate reactors to obtain the required parameter values, the obtained required parameter values ​​and known data are substituted into the model to calculate the effective specific surface area of ​​the suspended carrier packing material to be tested, which can improve the measurement accuracy of the effective specific surface area of ​​the suspended carrier packing material.

[0038] 2. The effective specific surface area of ​​the suspended carrier packing can be obtained directly through model calculation without having to calculate the total specific surface area first, which simplifies the measurement steps of the effective specific surface area.

[0039] 3. By controlling the temperature and dissolved oxygen concentration of the reactors carrying suspended carrier packing during the effective specific surface area measurement process, the maximum nitrification rate of each reactor is made equal, thus ensuring the accuracy of the measurement results. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the effective specific surface area measurement device for the suspended carrier packing material in the moving bed biofilm reactor of the present invention.

[0041] Figure 2 This is a schematic diagram of the reactor structure of the moving bed biofilm reactor suspended carrier packing effective specific surface area measuring device of the present invention.

[0042] Figure descriptions: 1. Inlet tank; 2. Reactor; 21. Reactor body; 22. First inlet; 23. First outlet; 24. Second inlet; 25. Second outlet; 26. Aeration inlet pipe; 27. Aeration head; 3. Outlet tank; 4. Inlet pump; 5. Aeration pump. Detailed Implementation

[0043] To more clearly disclose the technical solution of the present invention, the following description is provided in conjunction with embodiments and appendices. Figure 1-2 Provide a detailed description of the invention.

[0044] This invention provides a method and apparatus for measuring the effective specific surface area of ​​suspended carrier packing in a moving bed biofilm reactor, thereby improving the accuracy of the effective specific surface area measurement.

[0045] Example 1

[0046] This invention provides a method for measuring the effective specific surface area of ​​suspended carrier packing material in a moving bed biofilm reactor, the specific steps of which are as follows:

[0047] To obtain the required parameter values ​​for reactors loaded with suspended carrier packing material of known effective specific surface area and reactors loaded with suspended carrier packing material of unknown effective specific surface area;

[0048] When the nitrification rate of the reactor carrying a known effective specific surface area suspended carrier and the reactor carrying a suspended carrier with a known effective specific surface area to be tested reaches its maximum, the required parameter values ​​of the reactor carrying the known effective specific surface area suspended carrier and the effective specific surface area value of the known effective specific surface area suspended carrier are obtained and the maximum nitrification rate value of the known effective specific surface area suspended carrier is calculated by the model.

[0049] The effective specific surface area of ​​the suspended carrier to be tested is calculated by modeling based on the maximum nitrification rate and the required parameters of the reactor carrying the suspended carrier with the effective specific surface area to be tested.

[0050] In this embodiment, the required parameters for the reactors containing suspended carrier packing material with known effective specific surface area and those containing suspended carrier packing material with a known effective specific surface area include the influent ammonia nitrogen concentration. Ammonia nitrogen concentration in effluent Inlet flow rate Q Inf Volume (effective volume) V and filling rate f of suspended carrier packing meida The nitrification rate of the reactor is r. NH3 The effective specific surface area of ​​the suspended carrier packing is α. Where, f meida r represents the ratio of the volume of the suspended carrier packing to the effective volume of the reactor. NH3 The maximum amount of ammonia nitrogen nitrified per unit effective area of ​​biofilm per day.

[0051] In wastewater with a certain temperature and dissolved oxygen concentration, the ammonia nitrogen load can be adjusted ( Q Inf or f media ), can obtain the maximum r NH3 .when When the concentration is stable at <2 mg / L, r is considered to be... NH3 The maximum value has been reached. At this point, the maximum r of the reactor carrying suspended carrier packing with a known effective specific surface area and the reactor carrying suspended carrier packing with a measured effective specific surface area have been reached. NH3 The values ​​are equal. The nitration rate r NH3 The maximum r obtained by a reactor of the same specifications is independent of the type of suspended carrier packing material, but is related to the ammonia nitrogen concentration, organic matter concentration, temperature, and dissolved oxygen of the wastewater to be treated. NH3 The values ​​are equal.

[0052] Example 2

[0053] This invention provides a method for measuring the effective specific surface area of ​​suspended carrier packing in a moving bed biofilm reactor. Compared with Example 1, the specific steps further include:

[0054] In the process of obtaining the required parameter values ​​of the reactor carrying the known effective specific surface area suspended carrier packing and the effective specific surface area value of the known effective specific surface area suspended carrier packing through model calculation to obtain the maximum nitrification rate value of the known effective specific surface area suspended carrier packing, the following model is used to calculate the nitrification rate and effective specific surface area.

[0055]

[0056] In the formula, the nitrification rate r of the reactor is... NH3 The unit is gNH3-N / m 2 / d, influent ammonia nitrogen concentration and effluent ammonia nitrogen concentration The unit is mgNH3-N / L, and the influent flow rate is Q. Inf The units are L / d, reactor volume V is in L, and effective specific surface area α is in m². 2 / m 3 .

[0057] When the nitrification rate values ​​of the reactors carrying suspended carriers with known effective specific surface area and those carrying suspended carriers with undetermined effective specific surface area reach their maximum, the values ​​of the reactors carrying suspended carriers with known effective specific surface area and those carrying suspended carriers with undetermined effective specific surface area are obtained, respectively. Q Inf f media V;

[0058] The reactor obtained is loaded with suspended carrier packing material of known effective specific surface area. Q Inf f media Substituting V and α of the known effective specific surface area of ​​the suspended carrier packing into equation (1), we obtain the maximum r of the reactor loaded with the known effective specific surface area of ​​the suspended carrier packing. NH3 value.

[0059] Equation (2) can be obtained by transforming equation (1):

[0060]

[0061] The maximum r of the reactor is due to the presence of suspended carrier packing material with known effective specific surface area and suspended carrier packing material with undetermined effective specific surface area. NH3 If the values ​​are equal, the maximum r obtained according to equation (1) will be... NH3 And the reactor containing the suspended carrier packing material with the measured effective specific surface area. Q Inf f media Substituting V into equation (2), we obtain the α value of the suspended carrier filler with the effective specific surface area to be measured.

[0062] Example 3

[0063] This invention provides a method for measuring the effective specific surface area of ​​suspended carrier packing in a moving bed biofilm reactor. Compared with Example 2, the required parameter values ​​and nitrification rate values ​​of reactors carrying suspended carrier packing with known effective specific surface area and those carrying suspended carrier packing with the effective specific surface area to be measured, as well as the specific surface area values ​​of the known and those carrying the suspended carrier packing with the effective specific surface area to be measured, are shown in Table 1. The first reactor is the reactor carrying suspended carrier packing with known effective specific surface area, and the second reactor is the reactor carrying suspended carrier packing with the effective specific surface area to be measured. The ammonia nitrogen load of the first and second reactors is adjusted to... Both are consistently <2 mg / L, ensuring that the r in the first and second reactors is stable. NH3 Reach the maximum.

[0064] Table 1 Reactor and Suspended Carrier Packing Parameters

[0065]

[0066] According to Table 1, the α of the suspended carrier packing material in the first reactor is known, and the measured value will be used... Q Inf f media Substituting V into formula (1) in Example 2, we obtain the maximum r of the first reactor. NH3 It is 1.71 g NH3-N / m 2 / d, will the maximum r NH3 The second reactor obtained Q Inf f media Substituting V into formula (2), the α of the suspended carrier packing in the second reactor is obtained as 657m. 2 / m 3 .

[0067] Due to the maximum r of each reactor NH3 If they are equal, then equation (3) can be obtained from equations (1) and (2).

[0068]

[0069] In the formula, α2 is the effective specific surface area of ​​the suspended carrier packing in reactor 2. and V2 represents the influent ammonia nitrogen concentration and effluent ammonia nitrogen concentration of reactor 2, and Q represents the volume of reactor 2. Inf2 f is the influent flow rate of reactor 2. media2 α1 represents the filling rate of the suspended carrier packing in reactor 2; α1 represents the effective specific surface area of ​​the suspended carrier packing in reactor 1. and Let V1 be the influent ammonia nitrogen concentration and Q be the effluent ammonia nitrogen concentration of reactor 1, and V1 be the volume of reactor 1. Inf1 f is the influent flow rate of reactor 1. media1 The filling rate of the suspended carrier packing material in reactor 1.

[0070] According to equation (3), there is no need to calculate the maximum r separately. NH3 The value of α2 in reactor 2 can be obtained by directly substituting the parameter values ​​of reactor 1 and reactor 2 and the α1 value of the suspended carrier packing in reactor 1.

[0071] In this embodiment, reactor 1 and reactor 2 Q Inf f meida r NH3 The ammonia nitrogen loads in reactors 1 and 2 are equal, and V is equal. Since α is different from α, we can further simplify Equation (3) to obtain Equation (4), and substitute the corresponding parameter values ​​into Equation (4) to obtain the suspended carrier packing α2 to be tested in reactor 2.

[0072]

[0073] In reactors 1 and 2 Q Inf f meida When V is equal, α2 of the suspended carrier packing in reactor 2 can be directly calculated according to equation (3).

[0074] If the reactor 2 is obtained based on measurements With reactor 1 If they are equal, then α2 equals α1.

[0075] The present invention provides a method for measuring the effective specific surface area of ​​suspended carrier packing material in a moving bed biofilm reactor. For the suspended carrier packing material to be measured (α), the method can be used to determine the effective specific surface area of ​​the suspended carrier packing material (r). NH3 Once the maximum value is reached, the α of the suspended carrier is calculated back using the known α as a reference, resulting in higher accuracy of the measurement results.

[0076] Example 4

[0077] In conjunction with the measurement methods of Examples 1 to 3, the present invention provides an effective specific surface area measuring device for suspended carrier packing in a moving bed biofilm reactor, comprising an inlet tank 1, at least two reactors 2, and an outlet tank 3 in the same number as the reactors 2.

[0078] In this embodiment, there are four reactors 2 connected in parallel with the inlet tank 1, namely R1, R2, R3, and R4, and four outlet tanks 3. An inlet pump 4 is installed between the reactors 2 and the inlet tank 1 to transport the water to be treated from the inlet tank 1 to the reactors 2. The number of inlet pumps 4 is equal to the number of reactors 2. On each branch containing reactor 2, the inlet pump 4, reactor 2, and outlet tank 3 are connected in series. The inlet end of reactor 2 is connected to the inlet pump 4 via a pipeline, and the outlet end is connected to the outlet tank 3 via a pipeline.

[0079] The water to be treated in the inlet tank 1 is transported into the reactor 2 by the inlet pump 4, and after being treated by the reactor 2, it is discharged into the outlet tank 3.

[0080] During measurement, one of the four reactors 2 is selected to be loaded with a suspended carrier packing material with a known effective specific surface area α, while the remaining three reactors 2 are loaded with suspended carrier packing materials with an effective specific surface area α to be measured. This allows for the simultaneous measurement of the effective specific surface area α of the three types of suspended carrier packing materials, thus improving the measurement speed. Alternatively, the four reactors 2 can be divided into two groups, with one reactor 2 selected from each group. One reactor 2 is loaded with a suspended carrier packing material with a known effective specific surface area α, while the other reactor 2 is loaded with a suspended carrier packing material with an effective specific surface area α to be measured. Measurements are then performed in groups.

[0081] In other embodiments, the number of reactors 2 can be three or six. The specific number can be set and combined according to measurement needs, and can be either even or odd.

[0082] Reactor 2 uses aeration pump 5 for aeration, and aeration pump 5 is connected in parallel with all reactors 2. The action of aeration pump 5 ensures that there is sufficient dissolved oxygen in reactor 2, keeping the suspended carrier packing in a fluidized state, preventing the suspended carrier packing from sinking, and enhancing the contact between the organic matter in the water to be treated, microorganisms, and dissolved oxygen in reactor 2. This ensures that the microorganisms in reactor 2 can oxidize and decompose the organic matter in the water under conditions of sufficient dissolved oxygen.

[0083] In this embodiment, the inlet tank 1 is connected in parallel with multiple reactors 2, ensuring that the water quality entering each reactor 2 is consistent, and all reactors 2 treat water with the same level of pollution. A single aeration pump 5 is used to aerate multiple reactors 2, ensuring that the aeration degree of each reactor 2 is similar, and obtaining the same concentration of dissolved oxygen.

[0084] Reactor 2 includes a reactor body 21, which is an open cylinder with an open top and hollow side walls forming cylindrical cavities. The cylindrical shape of the reactor body 21 avoids blind spots during aeration of the suspended carrier packing. A first inlet 22 connecting the inside and outside of the reactor body 21 and a second inlet 24 connecting the side wall cavity of the reactor body 21 to the outside are located on the lower part of the side wall of the reactor body 21. The first inlet 22 is higher than the second inlet 24. A first outlet 23 connecting the inside and outside of the reactor body 21 and a second outlet 25 connecting the side wall cavity of the reactor body 21 to the outside are located on the upper part of the side wall of the reactor body 21. The first outlet 23 is lower than the second outlet 25. The first inlet 22 and the first outlet 23 are located on opposite sides of the side wall of the reactor body 21, and the second inlet 24 and the second outlet 25 are also located on opposite sides of the side wall of the reactor body 21.

[0085] In this embodiment, the reactor body 21 has an inner diameter of 150 mm, a height of 500 mm, and an effective volume of 8 L, and is made of polymethyl methacrylate. The distance between the first inlet 22 and the bottom wall of the reactor body 21 is 90 mm, and the distance between the second inlet 24 and the bottom wall of the reactor body 21 is 50 mm; the distance between the first outlet 23 and the top of the side wall of the reactor body 21 is 50 mm, and the distance between the second outlet 25 and the top of the side wall of the reactor body 21 is 40 mm.

[0086] During use, the wastewater to be treated enters the reactor body 21 through the first inlet 22 and is discharged through the first outlet 23 after treatment.

[0087] The side wall cavity of the reactor body 21 is a water bath constant temperature chamber. Constant temperature water enters the water bath constant temperature chamber through the second inlet 24 and is discharged through the second outlet 25, so that the reactor 2 is kept in a constant temperature state during measurement and use.

[0088] An aeration inlet pipe 26 is installed on the upper part of the side wall of the reactor body 21. One end of the aeration inlet pipe 26 is connected to an aeration head 27 placed at the bottom of the reactor body 21, and the other end is connected to an aeration pump 5. Air is supplied to the water in the reactor 2 by the aeration pump 5 through the aeration head 27 at the bottom of the reactor body 21. The air flow rate is controlled by a float flow meter on the pipeline. In this embodiment, the distance between the aeration inlet pipe 26 and the top of the side wall of the reactor body 21 is 135 mm.

[0089] The effective specific surface area measuring device for the suspended carrier packing in the moving bed biofilm reactor of the present invention is used during...

[0090] 1. Biofilm attachment

[0091] First, the known α suspended carrier packing material and the α to be tested suspended carrier packing material are placed in different reactors 2, respectively, so that the suspended carrier packing material comes into contact with the nitrifying sludge. Microorganisms adhere to the suspended carrier packing material, promoting biofilm formation. The inlet tank 1 continuously feeds the treated water into the reactor 2 to provide nutrients for microbial growth, and discharges it to the outlet tank 3 through the first outlet 23. Constant temperature water is injected into the cavity on the side wall of the reactor body 21 through the second inlet 24 to maintain a constant temperature of the treated water in the reactor body 21. Air is supplied to the reactor body 21 through the aeration pump 5 and aeration head 27. After successful biofilm formation, the sludge that has not been loaded onto the biofilm is removed from the reactor 2.

[0092] The uniform influent water source, temperature, and dissolved oxygen concentration ensure that all reactors 2 have the same reaction environment conditions.

[0093] In this embodiment, reactor R1 is placed with a suspended carrier packing material whose α is known, and reactor R2 is placed with a suspended carrier packing material whose α is to be tested.

[0094] The outlet water volume of reactors R1 and R2 is measured periodically using outlet tank 3, and the inlet water flow rate of reactors R1 and R2 is calibrated using the volumetric method.

[0095] 2. Ammonia nitrogen load adjustment

[0096] Gradually increase the ammonia nitrogen load in the influent of reactors R1 and R2 to ensure full biofilm production. This can be achieved by adjusting... Q Inf and / or f media To adjust the ammonia nitrogen load, such as by increasing... Q Inf The ammonia nitrogen load adjustment is based on the effluent measured in reactor 2. Changes in progress:

[0097] When at least three consecutive measurements are taken, The influent ammonia nitrogen load increased by 10% to 20%;

[0098] When at least three consecutive measurements are taken, Maintain or reduce the influent ammonia nitrogen load;

[0099] Until the effluent from reactor R1 Stable <2mg / L, r NH3 Once the maximum value is reached, the influent ammonia nitrogen load is no longer adjusted, and the concentration at this point is measured. f media . A stable concentration of less than 2 mg / L refers to the condition after reaching maximum load. The effluent concentration is consistently below 2 mg / L. Maximum load refers to the point at which, if the load continues to increase, the effluent ammonia nitrogen concentration exceeds the standard, showing an upward trend or even spikes. The ammonia nitrogen testing method refers to the standard "Determination of Ammonia Nitrogen in Water - Nessler's Reagent Spectrophotometric Method" (HJ 535-2009).

[0100] Adjust the conditions of reactor R2 to make reactor R2... Q Inf f media With reactor R1 Q Inf f media The ammonia nitrogen loads of reactors R1 and R2 are equal, and the ammonia nitrogen load of reactor R2 is measured at this time.

[0101] In this embodiment, reactors R1 and R2 have the same volume. During measurement, the influent ammonia nitrogen concentration is set in the reactor conditions. Inlet flow rate Q Inf , Suspended carrier filling rate f media All are equal, except for the ammonia nitrogen concentration in the effluent. The effective specific surface area α is different from that of suspended carrier packing.

[0102] 3. R1 reactor suspended carrier packing r NH3 Calculation of α for suspended carrier packing in reactor R2

[0103] The suspended carrier packing material r of reactor R1 is calculated according to formula (1). NH3 The obtained r NH3 Substituting into formula (2), we obtain the suspended carrier packing α of reactor R2.

[0104] In this embodiment, the wastewater to be treated is synthetic wastewater, which is specifically prepared according to the composition and concentration in Table 2. NaHCO3 and Na2CO3 are adjusted based on the pH of the effluent from reactor 2 to ensure sufficient alkalinity for the nitrification reaction within the reactor.

[0105] Table 2 Composition of Synthetic Wastewater

[0106]

[0107] The measurement parameters and frequencies of the effluent from reactor 2 are shown in Table 3.

[0108] Table 3 Water quality analysis indicators and frequencies

[0109]

[0110] The effective specific surface area measuring device for the suspended carrier packing in a moving bed biofilm reactor of the present invention provides reactor 2 loaded with suspended carrier packing of known effective specific surface area and suspended carrier packing of unknown effective specific surface area, inputs the same mass of water to be treated, and controls the temperature and dissolved oxygen concentration of the nitrification reaction through aeration and a constant temperature water bath to ensure that the maximum nitrification rate of each reactor 2 is equal. The effective specific surface area measuring device for the suspended carrier packing in a moving bed biofilm reactor of the present invention obtains various parameter values ​​for calculating the maximum nitrification rate of the reactor loaded with the suspended carrier packing of known effective specific surface area and the corresponding parameters of the reactor loaded with the suspended carrier packing of unknown effective specific surface area, and finally calculates the effective specific surface area of ​​the suspended carrier packing to be tested.

[0111] Using this device, one reactor 2 is loaded with a suspended carrier packing material with a known effective specific surface area, while the remaining reactor 2 is loaded with suspended carrier packing materials with different effective specific surface areas to be measured. The effective specific surface areas of multiple suspended carrier packing materials are measured simultaneously, thereby improving the measurement efficiency.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A method for measuring the effective specific surface area of ​​suspended carrier packing material in a moving bed biofilm reactor, characterized in that, Includes the following steps: To obtain the required parameter values ​​for reactors loaded with suspended carrier packing material of known effective specific surface area and reactors loaded with suspended carrier packing material of unknown effective specific surface area; When the nitrification rate of the reactors carrying the known effective specific surface area suspended carrier packing and the reactors carrying the effective specific surface area to be tested reaches its maximum, the required parameter values ​​of the reactors carrying the known effective specific surface area suspended carrier packing and the reactors carrying the effective specific surface area to be tested, as well as the effective specific surface area value of the known effective specific surface area suspended carrier packing, are obtained through model calculation to obtain the effective specific surface area value of the effective specific surface area suspended carrier to be tested. The required parameters for the reactors containing suspended carrier packing material with known effective specific surface area and those containing suspended carrier packing material with a measured effective specific surface area include the influent ammonia nitrogen concentration. Ammonia nitrogen concentration in effluent Inlet flow rate The volume of the reactor V and the filling rate of the suspended carrier packing , The model is as follows: In the formula, The nitration rate of the reactor, The effective specific surface area of ​​the suspended carrier packing; In the formula, The effective specific surface area of ​​the suspended carrier packing material to be tested. and The influent and effluent ammonia nitrogen concentrations of the reactor containing the suspended packing material to be tested are given. , The values ​​represent the volume of the reactor containing the suspended packing material to be tested and the influent flow rate. The filling rate of the suspended carrier packing in the reactor containing the suspended packing to be tested; Given the effective specific surface area of ​​the suspended carrier packing, and Given the influent and effluent ammonia nitrogen concentrations of the reactor containing the suspended carrier packing material, , Given the volume of the reactor containing the suspended carrier packing and the influent flow rate, The filling rate of the suspended carrier packing in the reactor is known.

2. The method for measuring the effective specific surface area of ​​the suspended carrier packing material in a moving bed biofilm reactor according to claim 1, characterized in that, Before calculating the effective specific surface area value of the suspended carrier to be tested, the maximum nitrification rate value of the known effective specific surface area suspended carrier is obtained by model calculation based on the required parameter values ​​of the reactor carrying the known effective specific surface area suspended carrier and the effective specific surface area value of the known effective specific surface area suspended carrier. The effective specific surface area value of the suspended carrier to be tested is obtained by model calculation based on the maximum nitrification rate value and the required parameter values ​​of the reactor carrying the suspended carrier packing material with the effective specific surface area to be tested.

3. The method for measuring the effective specific surface area of ​​the suspended carrier packing material in a moving bed biofilm reactor according to claim 1, characterized in that, The nitrification rates of the reactors carrying suspended carriers with known effective specific surface areas and those carrying suspended carriers with undetermined effective specific surface areas were assessed by adjusting the ammonia nitrogen load. The adjustment strategy for the ammonia nitrogen load was as follows: The ammonia nitrogen concentration in the effluent of the reactors loaded with suspended carrier packing material of known effective specific surface area and those loaded with suspended carrier packing material of unknown effective specific surface area was determined. If the effluent ammonia nitrogen concentration is ≤2 mg / L in at least three consecutive measurements, the influent ammonia nitrogen load should be increased by 10% to 20%. If the effluent ammonia nitrogen concentration is >2 mg / L in at least three consecutive measurements, the influent ammonia nitrogen load should be maintained or reduced.

4. The method for measuring the effective specific surface area of ​​the suspended carrier packing material in a moving bed biofilm reactor according to claim 3, characterized in that, The ammonia nitrogen load is adjusted by changing the influent ammonia nitrogen concentration, influent flow rate, and / or filling rate of the suspended carrier packing material in the reactors carrying known effective specific surface area and those carrying suspended carrier packing material with undetermined effective specific surface area. When the effluent ammonia nitrogen concentration of the reactors carrying known effective specific surface area and those carrying suspended carrier packing material with undetermined effective specific surface area is stably <2 mg / L, the nitrification rate of the reactors carrying known effective specific surface area and those carrying suspended carrier packing material with undetermined effective specific surface area reaches its maximum.

5. The method for measuring the effective specific surface area of ​​the suspended carrier packing material in a moving bed biofilm reactor according to claim 1, characterized in that, The reactors containing suspended carriers with known effective specific surface area and those containing suspended carriers with undetermined effective specific surface area have the same reaction temperature and dissolved oxygen concentration. The reactors containing suspended carriers with known effective specific surface area and those containing suspended carriers with undetermined effective specific surface area use synthetic wastewater for the reaction.

6. A device for measuring the effective specific surface area of ​​suspended carrier packing in a moving bed biofilm reactor, used to obtain the required parameter values ​​of the reactor carrying suspended carrier packing with known effective specific surface area and suspended carrier packing with effective specific surface area to be measured, as described in any one of claims 1-5, characterized in that, It includes at least one reactor (2) for loading a suspended carrier with a known effective specific surface area and at least one reactor (2) for loading a suspended carrier with an effective specific surface area to be tested. The inlet ends of the plurality of reactors (2) are connected to a common inlet tank (1). The inlet end is located at the lower part of the reactor (2), and the outlet end is located at the upper part of the reactor (2). The inlet tank (1) delivers water to be treated into the reactor (2) through an inlet pump (4). The outlet ends of the reactors (2) are each connected to a separate outlet tank (3) for flow calibration.

7. The effective specific surface area measuring device for the suspended carrier packing in a moving bed biofilm reactor according to claim 6, characterized in that, The reactor (2) includes a reactor body (21), the sidewall of the reactor body (21) includes a constant temperature layer, the sidewall of the reactor body (21) is hollow to form a chamber, the lower part of the chamber is provided with a second water inlet (24) for constant temperature source input, and the upper part of the chamber is provided with a second water outlet (25) for constant temperature source output.

8. The effective specific surface area measuring device for the suspended carrier packing material in a moving bed biofilm reactor according to claim 6, characterized in that, The reactor (2) includes an aeration assembly, which includes an aeration head (27) disposed in the reactor (2) and an aeration inlet pipe (26) disposed on the reactor (2) and connected to the aeration head (27). A plurality of the aeration inlet pipes (26) are connected to an aeration pump (5).

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