5 results about "Nitrite concentration" patented technology

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.

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 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.