34results about How to "Solve refractory" patented technology

The present invention provides a method and system for treating saline wastewater. The method of the present invention comprises: making saline wastewater flow through activated sludge containing halophilic bacteria, using the activated sludge to perform desalination pretreatment on the saline wastewater to obtain the first treated wastewater, and gradually increasing the saline wastewater during the desalination pretreatment process Flow rate, to measure the TDS value of saline wastewater at different flow rates; to measure the water quality parameters of the first treated wastewater, each water quality parameter has a corresponding preset range, and the TDS value under the flow rate corresponding to each water quality parameter value that meets the preset range Set as the first TDS optimal value group; adjust the flow of saline wastewater into the activated sludge, so that its TDS value reaches the range covered by the first TDS optimal value group, so as to continue desalination treatment of saline wastewater, water quality Parameters include COD and / or ammonia nitrogen content. The method and system of the invention can realize economical and effective removal of pollutants in saline wastewater.

The invention relates to an adsorption treatment method for cationic dye. The adsorption treatment method for the cationic dye comprises the following steps: firstly utilizing water to classify lignin into a water soluble fraction and a water insoluble fraction, then utilizing a ketone solvent to classify the water insoluble lignin fraction into a ketone soluble fraction and a ketone insoluble fraction again, and using the finally obtained water insoluble and ketone insoluble fraction for adsorbing and separating cationic dye methylene blue, cationic brilliant red, crystal violet, methyl violet and the like. The dissolution classification method only relates to dissolution classification of lignin and does not relate to chemical modification, so that the method provided by the invention has the advantages of simple technology and low cost; and water and the ketone solvent used for dissolution classification can be repeatedly utilized by recycling, and no consumption or loss is produced, so that the method provided by the invention has the advantage of being environment-friendly.

This case relates to a water purifying agent for industrial wastewater and a preparation method thereof. Each 100 parts of the water purifying agent includes the following raw materials in parts by mass: 30-40 parts of modified starch, 3-8 parts of carboxylated nanocellulose , 4-8 parts of polysilicate, 8-15 parts of attapulgite, 3-6 parts of biological sterilizing agent and the balance of water; wherein, the modified starch is caprolactone graft modified corn starch, An amide bond is attached to the graft chain. The invention uses caprolactone as the bridge connecting the amide bond with the corn starch to provide cohesion-flocculation for the polymer starch; the carboxylated nanocellulose is also a natural polymer with a structure similar to that of starch, which can assist the modified starch to promote The flocs settle quickly, and its nano-size effect helps to load the biological sterilizer, which further reduces COD and improves the sterilization performance; polysilicate and attapulgite are used together as inorganic substances to further improve the adsorption and flocculation performance. , to achieve the effect of comprehensive management.

The invention provides a strain of Stenotrophomonas that efficiently degrades polybutylene terephthalate / adipate and the application thereof. The present invention isolates and screens a PBAT-degrading bacterium that can secrete lipase, Stenotrophomonas sp.strain YCJ1, from the soil of Yanxia Town, Liquan County, Shaanxi Province, and names it Stenotrophomonas sp. Species Collection and Management Center, the deposit number is CGMCC 18059. The advantage of the present invention is that the bacterium can secrete lipase and efficiently degrade PBAT, and the bacterium has a better degradation effect under alkaline conditions, and the Stenotrophomonas and its lipase can be used as enzyme preparations and biological agents It has a good application value when applied to the environmental remediation of PBAT and PBAT-based biodegradable materials in alkaline environment.

The present invention relates to a gemini-type fluorine-containing surfactant and its preparation method and application. The perfluoropolyether alcohol (PFPE‑OH) is reacted with a halogenated allyl group to introduce an unsaturated double bond; Methylhydrogendichlorosilane undergoes a hydrosilylation reaction; the intermediate product obtained reacts with carbon magnesium polyethylene glycol monomethyl ether to generate perfluoropolyether-polyethylene glycol-methyl monochlorosilane (PFPE- SiCl‑PEG); further hydrolysis and condensation to obtain a gemini-type fluorosurfactant. The hydrophobic group used in the surfactant of the present invention is perfluoropolyether, which not only avoids the long carbon chain fluorine used in commonly used fluorosurfactants such as perfluorooctanesulfonamide (PFOS) and perfluorooctanesulfonic acid (PFOA). The alkyl group is refractory to degradation and cumulative toxicity, and its hydrophobicity can be easily adjusted by controlling the molecular weight of the perfluoropolyether chain segment, and has very high hydrophobicity. The preparation process of the gemini type fluorine-containing surfactant of the present invention is simple and convenient, the reaction condition is mild, the production only needs conventional equipment, and is suitable for industrialized production.

The invention relates to a pressure-resistant structure of a large-depth submersible. The pressure-resistant structure is of a combined structure form, and comprises an inner shell, an outer shell, aleft flange and a right flange, wherein the inner shell is of a main force bearing structure, the inner shell is formed by winding on the basis of the left flange and the right flange, the outer shellis formed by rolling a titanium alloy plate and welding the titanium alloy plate through a longitudinal weld joint and is tightly attached to an inner shell ring rib, and the outer shell is connectedwith the left flange and the right flange through circumferential weld joints at the two ends. The inner shell is of a cylinder and outer ring rib structure, outer ring ribs are distributed at equalintervals, and the specific intervals are optimally configured according to the minimum stress criterion of a pressure-resistant structure when external pressure is borne. The inner shell and the outer shell are connected through the butt joint circumferential weld joint, the weld joint only bears tension and pressure, and the stress form is simple. The submersible has a large-depth pressure-resistant structure which is high in underwater pressure resistance, good in pressure-resistant stability, uniform in pressure-resistant stress, light in weight, high in specific strength, good in impact resistance, long in seawater corrosion resistance duration, long in service life, non-magnetic and good in concealment.

The invention relates to a method for preparing fluoropolyolefins based on a gemini-type fluorosurfactant. In the presence of an initiator and a gemini-type fluorosurfactant, the monomer fluoroolefin is used as a raw material for polymerization reaction to prepare a fluoroolefin polymer ;Use perfluoropolyether-polyethylene glycol-methyl monochlorosilane (PFPE-SiCl-PEG) to hydrolyze and condense to obtain a gemini-type fluorosurfactant, which is directly bonded by an ether bond (-O-) to make Two hydrophobic segments and two hydrophilic segments are tightly coupled to form a compact gemini surfactant structure, which provides excellent surface activity. The fluorine-containing surfactant provided by the invention is applied to the dispersion polymerization of fluoroolefins. The monomer fluoroolefins have strong dispersion in the water phase, and the solid content of a single polymerization tank can reach 25% to 32%, which has the advantage of high productivity.

The invention belongs to the field of photocatalytic degradation of dyes, and particularly relates to a novel rare-earth praseodymium complex with capability of effective photodegradation of an azo dye, and a preparation method and an application of the complex. The preparation method comprises the steps pf introducing pyridine carboxylic acid aglucon with a coordination effect on a rare earth ion into a polymer side group, and then coordinating with Pr<3+> to form the novel rare-earth praseodymium complex with the capability of the photodegradation of the azo dye. A chemical formula of the complex is {[Pr(L<2>)1.5(DMF)(H2O)2](DMF)}n, wherein L<2> is a group of 2,2'-dipyridyl-4,4'-dicarboxylic acid with two protons removed; DMF is N,N-dimethylformamide; and n represents a natural number from 1 to positive infinity. The novel rare-earth praseodymium complex effectively solves the problem of the difficult degradation of the azo dye.