10 results about "Geosmin" patented technology

The invention discloses a method for deep catalytic degradation of trace odor pollutants in a water environment by a piezoelectric field, and belongs to the technical field of water treatment.The method comprises the following steps that a purifying agent is added into the water environment to be treated, the active ingredient of the purifying agent is a piezoelectric material ZnO-Bi2O2 (OH) NO3, then mechanical excitation is applied by utilizing ultrasonic vibration or fluid pulse power, and the water environment to be treated is subjected to deep catalytic degradation; enabling the piezoelectric material ZnO-Bi2O2 (OH) NO3 to generate a local piezoelectric field to attract the odor pollutants in the water environment and catalytically degrade the odor pollutants, so as to remove the odor pollutants in the water environment; the odor pollutants comprise dimethyl isoborneol and / or geosmin. The method disclosed by the invention is green and environment-friendly, high in removal rate of odor pollutants and good in economical efficiency, and has a good application prospect in the field of water treatment, especially in front-end treatment of drinking water plants.

The utility model provides a feeding device for removing 2-MIB and geosmin in raw water through combination of ozone and hydrogen peroxide, which comprises a first ozone feeding area, a hydrogen peroxide feeding area and a second ozone feeding area which are sequentially communicated through a water inlet pipeline, and ozone is directly fed into the water inlet pipeline by the first ozone feeding area; the hydrogen peroxide adding area is used for directly adding a hydrogen peroxide solution into the water inlet pipeline; the second ozone adding area is a water distribution well arranged above the water inlet pipeline, the bottom of the water distribution well is communicated with the water inlet pipeline, the water distribution well is provided with a water-stop sheet with a sealed bottom and an overflow port at the top along the circumferential direction of a water inlet, the water-stop sheet divides the water distribution well into an inner area and an outer area, and the inner area and the outer area are respectively provided with a plurality of ozone aeration devices close to the bottom; the outer area needs to be filled with water before use, and a water outlet is formed in the circumferential bottom of the outer area. According to the scheme, 2-MIB and geosmin in raw water can be removed through combination of ozone and hydrogen peroxide by utilizing an existing structure, no reaction equipment needs to be additionally arranged, and transformation can be achieved without cutting off water.

The application belongs to the technical field of water quality safety intelligent monitoring, and discloses a single smell substance intelligent detection and self-checking system based on an electronic nose sensor array and multi-source information cooperation, which comprises an electronic nose sensor array module (containing a geosmin specificity sensor, a dimethyl isochroman specificity sensor and a dimethyl trisulfide specificity sensor), a multi-parameter monitoring module, a machine learning data processing module and a result output module; the multi-parameter monitoring module collects the dissolved oxygen consumption rate, pH value, conductivity and water temperature of water bodies in real time; and the machine learning data processing module establishes a dynamic correlation model of the single smell substance concentration and characteristic parameters through a machine learning algorithm. The application effectively solves the false positive misjudgment problem under the interference of a complex matrix, improves the detection accuracy to more than 95%, and has a concentration prediction error of less than or equal to 5%, thereby providing reliable technical support for the prevention and control of single smell pollution in drinking water, surface water and other water bodies.

The application discloses a method for dynamically regulating the content of smell and taste substances in the secondary metabolism process of streptomyces, and relates to the technical field of molecular biology. The method for dynamically regulating the content of smell and taste substances in the secondary metabolism process of streptomyces disclosed by the application determines a first promoter and an sgRNA sequence capable of targeting a first target gene affecting the synthesis of a target compound according to the types of microorganisms and the target compound; a first recombinant plasmid is constructed by using a molecular cloning method; meanwhile, a second promoter for starting the synthesis of the target compound and a gene sequence capable of encoding a Cas protein losing cutting activity are determined, and the two are connected to obtain a regulation unit; the linearized enzyme cutting product after double enzyme cutting of the first recombinant plasmid is connected with the regulation unit to obtain a time-sequential dynamic inhibition recombinant plasmid, and after the recombinant plasmid is introduced into streptomyces, a streptomyces strain with reduced content of smell and taste (geosmin) substances in the secondary metabolism process is obtained.

The present invention provides a solid cosmetic product comprising geosmin, and also provides a solid cosmetic product comprising (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product; (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product; (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product.

The application discloses a method for rapidly detecting geosmin-producing Streptomyces in Daqu samples, and relates to the technical field of liquor brewing microbial detection, and comprises the following steps: selectively culturing target Daqu samples to obtain Streptomyces enrichment culture solution; extracting nucleic acids from the Streptomyces enrichment culture solution and performing probe method fluorescence quantitative PCR amplification to obtain Streptomyces specificity fluorescence signal determination results; performing pretreatment to obtain a to-be-tested sample extract; performing quantitative analysis to obtain geosmin and its content data; and integrating the data to obtain the final determination results of geosmin-producing Streptomyces. The application combines the enrichment, probe method fluorescence quantitative PCR and GC-MS quantification, realizes integrated detection of Streptomyces identification and geosmin quantification in Daqu, and greatly improves the detection integrity and efficiency. The specific probe method qPCR combined with the optimized HS-SPME-GC-MS condition significantly improves the specificity and sensitivity of target bacteria and odor-causing substance detection, and effectively avoids false positives and matrix interference.

The present application belongs to the technical field of sample pretreatment and substance detection, and provides a fish muscle pretreatment method for off-flavor substance detection and a sample detection method after machine loading. The pretreatment method of the present application is simple to operate, can meet batch processing of multiple samples, and has strong practicability for detection of off-flavor substances in actual batch fish muscle samples. Moreover, the extraction method of the present application can realize simultaneous extraction of multiple off-flavor substances (n-hexanal, n-hexanol, 1-octen-3-ol, 2-methylisoborneol and geosmin) and has high recovery rate. In addition, the pretreatment method of the present application does not require expensive instruments and equipment, and the required consumables are cheap and low in cost. The present application also provides a detection method of the sample after machine loading obtained by the pretreatment method, and the detection method of the present application has a sample loading time of only 18 min for a single sample, is short in sample analysis time, and can simultaneously detect five off-flavor substances.

The application discloses micro-polluted water smell targeting composite biological filter material and preparation and application thereof, the filter material is a spherical particle, and sequentially comprises a high-density manganese sand core accounting for 75% of the diameter, an amino-chitosan biological affinity layer accounting for 15%-20%, and a COF-graphene hybrid adsorption layer accounting for 5%-10%; the three-layer structure cooperatively realizes selective adsorption, electrochemical activation and biological mineralization of geosmin, 2-MIB and other odor-causing substances; the outer layer is rich in easily degradable nutrients for metabolism of the middle-layer indigenous bacteria, the inner layer delta-MnO2 and graphene construct an electron transfer channel, and oxidation degradation is strengthened; the filter material has excellent sedimentation, mechanical strength and self-sustaining ecological functions, and significantly improves long-term, stability and impact resistance of smell removal, and is suitable for deep treatment of drinking water.

The present invention provides a method for removing odorous substances. The present invention combines two means, slightly acidic electrolyzed water treatment and ultraviolet irradiation, to effectively remove not only geosmin and 2-methylisoborneol in water, but also geosmin and 2-methylisoborneol in aquatic organisms. In addition, the removal effect of the inventive method on geosmin and 2-methylisoborneol in water is significantly better than the sum of the effects of using slightly acidic electrolyzed water treatment alone and using ultraviolet irradiation alone, indicating that the two means of slightly acidic electrolyzed water treatment and ultraviolet irradiation of the present invention play a synergistic role in removing geosmin and 2-methylisoborneol.

The invention relates to the technical field of water pollution and water body odor substance detection, in particular to a primer group, a kit and a method for detecting blue-green algae generating geosmin in a water body based on a recombinase-mediated isothermal nucleic acid amplification (RAA) technology. The sequence of a forward primer Geo-F, a reverse primer Geo-R1 and a probe primer Geo-P2 which are designed in the invention and used for detecting the geoA gene generating geosmin are shown as SEQ ID No.1, the sequence of the reverse primer Geo-R1 is shown as SEQ ID No.2, and the sequence of the probe primer Geo-P2 is shown as SEQ ID No.3. The primer group can effectively amplify the geoA gene of geosmin, has high specificity and sensitivity, has no cross reaction with cyanobacteria which does not generate geosmin, and can be used for detecting the geoA gene generating geosmin. The kit can be used in combination with lateral flow immunochromatography for on-site rapid detection of geosmin, and has important significance in early warning of excessive geosmin content in a water body.