15 results about "Nitrite concentration" patented technology

The invention relates to the technical field of wastewater treatment or water quality purification, in particular to a method for synchronously culturing ammonia oxidizing bacteria and nitrite oxidizing bacteria, which comprises the following steps: selecting an inorganic material which is large in specific surface area and can quickly neutralize and release alkalinity as a nitrifying bacteria attachment carrier and an alkalinity supplement / pH regulator; the carrier is dissolved through nitration acid production, carbon dioxide and alkalinity are released, a carbon source and alkalinity required by growth are provided for nitrifying bacteria, and propagation of the nitrifying bacteria is promoted. Ammonia oxidizing bacteria and nitrite oxidizing bacteria are cultured synchronously by controlling the growth speed of the two bacteria in the culture process. By controlling the ammonia nitrogen concentration and nitrite concentration of the effluent at the end of culture to be lower than 50mg / L, sufficient time is provided for nitrite oxidizing bacteria to decompose an intermediate product nitrite, so that the purpose of simultaneously culturing AOB and NOB is achieved.

A device and a method for maintaining the stability of anaerobic ammonium oxidation (anammox) by using a combined zeolite filler to resist water quality fluctuations are provided. The device includes a water inlet tank, an anammox reactor, and a water outlet tank, where the anammox reactor is filled with the combined zeolite filler maintained in a state of suspension, domestic sewage enters the anammox reactor through a water inlet pump, and effluent water enters the water outlet tank through an overflow port. The device combines the physical characteristics of zeolite adsorption of ammonium with the anammox process: when the concentration of ammonium in the influent water is too high, the zeolites will temporarily store the excess ammonium adsorbed; when the concentration of nitrite in the influent water is too high, the zeolites are capable to release the stored ammonium into a liquid phase through balanced adsorption desorption.

The invention discloses an intelligent fish tank monitoring method and device based on the Internet of Things, electronic equipment and a medium, and the method comprises the steps that water quality parameters of a fish tank are collected through a sensor group, and the water quality parameters comprise at least one of the temperature, the PH value, the dissolved oxygen concentration, the ammonia nitrogen content and the nitrite concentration; video data of a fish tank are collected through a camera, biological behavior characteristics of fishes are extracted through a computer vision algorithm, and the biological behavior characteristics comprise a swimming activeness index, a food taxis index, a respiratory rate index and posture anomaly detection; performing multi-modal data fusion on the water quality parameters and the biological behavior characteristics to generate a comprehensive evaluation result of the health state of the fish tank; and generating a control instruction according to the fish tank health state comprehensive evaluation result so as to control fish tank equipment to execute corresponding operation. According to the method, the water quality parameters and the fish biological behavior characteristics are synchronously obtained, the comprehensiveness of fish tank monitoring is improved, and more comprehensive and more accurate basic data support is provided for subsequent health assessment.

This invention relates to the field of wastewater biological treatment technology, specifically to a device and method for improving the autotrophic denitrification performance of a MABR reactor. It employs a composite membrane module combining a curtain-type silica gel filament membrane with excellent oxygen permeability with a spatial three-dimensional mesh packing material that facilitates the attachment of anaerobic ammonia-oxidizing bacteria, thereby coupling part of the nitrification reaction with the anaerobic ammonia oxidation reaction. Through the circulating reaction zone and membrane reaction zone within the reactor, nitrate nitrogen generated by anaerobic ammonia oxidation and excess nitrite nitrogen during instability adjustment are circulated and removed, thus improving the total nitrogen removal efficiency of the reactor. By adding appropriate amounts of sodium nitrite solution at appropriate times, the free nitrite concentration in the reactor mixture is increased. Simultaneously, the intermittent aeration ratio of the MABR is controlled to achieve synergistic inhibition of nitrite-oxidizing bacteria activity by low dissolved oxygen and high free nitrite, allowing the unstable short-range nitrification reaction to recover and improving the autotrophic denitrification performance of the reactor.

The present invention provides a method of controlling a wastewater treatment plant. The plant comprises at least one process tank and an aeration structure configured for aeration of the at least one process tank. The method comprises alternating steps of increasing aeration to the at least one process tank when a first event occurs, wherein the first event is one of when a first threshold value of a first tank parameter is reached and when a first predetermined time period has expired, and decreasing aeration to the at least one process tank when a second event occurs, wherein the second event is one of when a second threshold value of a second tank parameter is reached and when a second predetermined time period has expired. The first and second tank parameters are selected from a group consisting of nitrate concentration, nitrite concentration, and ammonium concentration determined in the water in the at least one process tank, and the steps of increasing aeration and decreasing aeration are carried out to reduce N2O emissions from the plant.

This invention discloses a denitrification system for high-concentration nitrogen-containing wastewater. The denitrification system includes a loading tank, an aeration pump, a reactor, and a real-time monitoring and control device. The loading tank is connected to the reactor and controlled by valves. The aeration pump controls the switching between nitrification and denitrification reactions. The reactor is filled with packing material adsorbing mycobacteria with preservation number CCTCC M20241347. The real-time monitoring and control device is used to detect the ammonia nitrogen concentration, nitrite concentration, and pH value of the reaction liquid in the reactor, and based on the detected ammonia nitrogen concentration, nitrite concentration, and pH value, controls the switching of the aeration pump to achieve the switching between nitrification and denitrification reactions. It also controls the opening and closing of the valves to control the addition of organic carbon sources, acids, or alkalis from the loading tank to the reactor. This invention also discloses a denitrification process for high-concentration nitrogen-containing wastewater, which can achieve efficient denitrification of high-concentration nitrogen-containing wastewater.

The invention provides a control method and system of a short-cut nitrification and anaerobic ammonia oxidation reactor and the reactor, and relates to the technical field of wastewater treatment.The method includes the steps that in the short-cut nitrification process, obtained load parameters and substrate concentration time sequences are used for fitting the nitrite concentration, and the reaction coefficient of the actual generation amount and the target generation amount is calculated; the method comprises the following steps: firstly taking nitrite as a gas pump to adjust the gas flow of the gas pump, then taking the generated nitrite as a substrate of anaerobic ammonia oxidation reaction, fitting the nitrogen concentration to obtain the actual generation amount of nitrogen, calculating the deviation value, then setting a dynamic deviation threshold value on a fitting curve of the nitrogen concentration, judging whether the deviation of the generation amount exceeds the standard or not, and finally, according to a feedback result, judging whether the generation amount exceeds the standard or not. A PID control formula is applied to adjust load operation parameters, and corresponding adjustment strategies are formulated for different reaction stages. According to the invention, dynamic optimization adjustment of the load operation parameters of the short-cut nitrification and anaerobic ammonia oxidation coupling reactor is realized through real-time monitoring and PID control.

The invention discloses a composite bacillus preparation for degrading nitrite and application of the composite bacillus preparation, and belongs to the technical field of biology. The composite bacillus preparation provided by the invention comprises the following components: bacillus YHBLS-1 and bacillus licheniformis YHD2, the preservation number of the bacillus YHBLS-1 is CCTCC NO: M20251258, the preservation number of the bacillus licheniformis YHD2 is CCTCC NO: M 20251259, the two strains are respectively fermented to prepare bacterial powder of a single strain, then the bacterial powder is compounded to obtain the composite bacillus preparation, and the composite bacillus preparation can be used for preparing the composite bacillus preparation. Compared with a single strain, the composite bacillus preparation can efficiently degrade nitrite and is remarkable in effect, the concentration of the nitrite in the sewage is reduced to 0.15 mg / L from 2.12 mg / L before putting within 48 hours when the composite bacillus preparation is put into aquaculture sewage with the adding amount of 5g / m < 3 >, the effect is remarkable, and the nitrite can be effectively degraded. The method is of great significance to purification and improvement of nitrite pollution in an aquaculture water environment, and has an application prospect.

The invention relates to the technical field of environmental microorganisms, in particular to Rhodococcus ruber CPU-RR2502 with a strong nitrite degradation function, the strain is preserved in the General Microbiological Center of the China Committee for Culture Collection of Microorganisms, and the preservation number is CGMCC No.35890. The invention further discloses a preparation method of the Rhodococcus ruber CPU-RR2502 with the strong nitrite degradation function. The strain is separated from bottom mud of an aquaculture pond and has efficient degradation capacity on nitrite in a water body, and the degradation rate on 1g / L sodium nitrite within 72 hours reaches 96.8%. The strain can adapt to an aquaculture environment, can be used for developing a microbial preparation, greenly and safely controlling the nitrite concentration through a bioremediation mode, ensuring the safety of aquatic animals and reducing the risk of secondary pollution caused by a traditional chemical method, and has a wide application prospect.

The application provides a short-range nitrification and anaerobic ammonia oxidation reactor control method and system, and relates to the technical field of wastewater treatment.The application fits nitrite concentration by using obtained load parameters and substrate concentration time series in the short-range nitrification process, calculates the reaction coefficient of the actual generation amount and the target generation amount, adjusts the gas flow of the gas pump, uses the generated nitrite as the substrate of the anaerobic ammonia oxidation reaction, fits the nitrogen concentration, obtains the actual generation amount of nitrogen, calculates the deviation amount, sets a dynamic deviation threshold on the fitting curve of the nitrogen concentration, judges whether the generation amount deviation is over the standard, finally adjusts the load operation parameters according to the feedback result by using a PID control formula, and formulates corresponding adjustment strategies for different reaction stages.The application realizes the dynamic optimization and adjustment of the load operation parameters of the short-range nitrification and anaerobic ammonia oxidation coupled reactor by real-time monitoring and PID control.

The present application relates to the technical field of biological denitrification, and particularly relates to a SNADF efficient biological denitrification device and method based on endogenous biomass fermentation. The specific technical scheme is as follows: (1) in the reactor, sewage and livestock and poultry wastewater are added, after starting the short-cut nitrification process, the dissolved oxygen is controlled at 0.3-0.5 mg / L, the pH is 7.5-8.0, and the total nitrogen removal rate of the reactor is higher than 85%; (2) the C / N ratio is adjusted to 0-0.1, the temperature is adjusted to 20-25 DEG C, the HRT is adjusted to 48-60 h, and the starvation strategy time is 36-48 h; after the starvation strategy, the C / N ratio is restored to 1-1.5, the temperature is restored to 30-35 DEG C, the HRT is restored to 16-20 h, and the recovery period is 48-60 h; during the implementation of the starvation strategy, the ammonia nitrogen in the reactor effluent should not be higher than 50 mg / L, the nitrite concentration should not be higher than 20 mg / L, and the total nitrogen removal rate of the reactor is higher than 93%. The present application takes the endogenous biomass such as extracellular polymeric substance (EPS) as the fermentation substrate, realizes the SNADF process in the reactor, and can simultaneously realize high-level denitrification, sludge reduction performance and low-energy-consumption operation.

The invention belongs to the technical field of gel preparation and nitrite detection, and particularly relates to hydrogel as well as a preparation method and application thereof. The invention develops a pretreatment-free colorimetric detection method for rapid determination of nitrite. A diazotization oxidation reaction of nitrite and TMB under an acidic condition enables the solution to generate color change from colorless to orange, and the color change process can be observed by naked eyes. And the absorbance value and the image gray value at 450nm can be used for quantitative detection. Based on the principle, hydrogel is introduced to construct the nitrite sensor. By utilizing the inherent three-dimensional grid structure of the hydrogel, macromolecules such as protein and fat compounds are blocked outside the gel and only can be retained on the surface layer of the gel; and nitrite permeates into the gel along with water to initiate a chromogenic reaction. The bottom image of the gel is collected through the smart phone, and the gray value of the gel is analyzed, so that the nitrite concentration can be quantified.

An absorption spectrum measurement method for simultaneously predicting concentrations of nitrate and nitrite in a water body comprises the following steps: firstly, collecting spectral data of single-component samples of nitrate and nitrite and a mixed sample of the single-component samples, and sequentially carrying out moving average filtering and normalization treatment; a BP neural network structure with two parallel channels is constructed, spectral features of nitrate and nitrite are extracted respectively, and respective concentration prediction is carried out; in the single-substance training stage, similar and heterogeneous sample pairs are constructed by using single-component samples, a differential learning mechanism is introduced, the distinguishing capability of the model on nitrate and nitrite characteristics is enhanced, and in the mixed substance fine tuning stage, part of a characteristic extraction layer is unfrozen, a regression layer is finely tuned, and interference information of mixed substances is learned; and inputting spectral data of a mixed solution of the nitrate and the nitrite into the trained model, and outputting concentration values of the nitrate and the nitrite. According to the method, under the condition that the spectrums of the two are seriously overlapped, simultaneous prediction can still be realized, and an accurate prediction result is obtained.

The present invention provides a water treatment device that can stably treat COD components while suppressing the generation of nitrite to a low level. [Solution] A water treatment apparatus comprising a biological treatment tank containing activated sludge containing bacteria capable of decomposing COD components, and into which water to be treated containing ammonia and thiocyanate ions is introduced. This water treatment apparatus comprises an aeration device that performs aeration in the biological treatment tank, and a measuring unit that measures at least one concentration value selected from the group consisting of ammonium concentration, nitrite concentration, and nitrate concentration in the treated water obtained by treating the water to be treated in the biological treatment tank. Furthermore, this water treatment apparatus comprises a control unit that adjusts the aeration airflow rate based on the difference between the ammonium concentration in the water to be treated and the ammonium concentration in the treated water measured by the measuring unit, and at least one index value selected from the group consisting of nitrite concentration, nitrate concentration, and the sum of nitrite concentration and nitrate concentration in the treated water measured by the measuring unit.

The application discloses an artificial compound feed for reducing nitrogen pollution of seawater fish culture water, which comprises an animal protein source and a feeding attractant, wherein the animal protein source is composed of fish meal and pork meal, the fish meal accounts for 60-80% of the mass of the animal protein source, and the pork meal accounts for 20-40% of the mass of the animal protein source; and the feeding attractant is fishy odor, and accounts for 0.5-2.0% of the total weight of the artificial compound feed. Compared with the artificial compound feed using fish meal as the animal protein source, the artificial compound feed not only has the same performance of maintaining normal growth of the cultured fish, but also reduces the feed cost, and more importantly, can significantly reduce the ammonia nitrogen and nitrite concentration in the cultured water, thereby providing an effective method for controlling nitrogen pollution from the feed source.