9 results about "Degradation reaction" patented technology

This invention discloses a method for the photocatalytic degradation of bisphenol A and the synergistic generation of H2O2 based on O-ZnIn2S4, comprising: adding the O-ZnIn2S4 photocatalytic material to wastewater containing bisphenol A, and performing photocatalytic degradation of bisphenol A and in-situ generation of H2O2 under visible light irradiation. Under light conditions, the O-ZnIn2S4 photocatalytic material of this invention exhibits excellent activity in the organic matter degradation reaction, while its H2O2 generation rate is high. The system of this invention achieves synergistic coupling of organic pollutant removal and in-situ hydrogen peroxide generation, providing a new photocatalytic strategy for green and efficient hydrogen peroxide synthesis and environmental remediation.

This invention relates to the field of polymer material degradation and recycling technology, and provides a process for the efficient degradation of PET using alcoholysis under low-temperature conditions, comprising the following steps: S1, raw material preparation and degradation reaction: waste PET fragments and ethylene glycol are added to a reaction vessel, stirred at 120-150℃, a composite catalyst is added, and the degradation temperature and pressure are controlled. The reaction is carried out for 2-6 hours to obtain a reaction solution; S2, separation: the reaction solution is filtered to separate solid and liquid components. The solid component enters the recycling system, and the liquid component enters the recrystallization system; S3, recrystallization: water is added to the recrystallization system, the mixture is cooled and crystallized, filtered, and the resulting solid enters the degradation system. The resulting liquid undergoes secondary crystallization. After crystallization, the solid obtained is filtered to obtain the product BHET, which is dried and collected. The filtered liquid enters the purification system; S4, purification; S5, crystallization. The preparation method of this invention provides a process for the alcoholysis degradation of PET, which has the advantages of low PET degradation temperature and high BHET yield.

The present application relates to the field of carbon dioxide capture, and discloses a method and system for reducing degradation loss of flue gas carbon capture absorption solvent, comprising stripping oxygen from the absorption solvent rich solution to obtain oxygen-containing stripping gas and spent absorption solution; the spent absorption solution is regenerated to obtain regenerated gas and absorption solvent lean solution, wherein at the same time, the oxygen-containing stripping gas is used to extract the regenerated gas, the method provided by the present application adds a stripping oxygen removal step, first strips oxygen from the CO2-rich absorption solvent rich solution after absorption, and regenerates the oxygen physically dissolved in the absorption solvent rich solution, thereby reducing the oxygen concentration in the absorption solvent, and further reducing the possible degradation reaction, then using the obtained oxygen-containing stripping gas to extract the regenerated gas during regeneration, reducing the operation pressure during regeneration to reduce the operation temperature, thereby reducing the degradation reaction rate, and achieving the purpose of reducing the degradation loss of flue gas carbon capture absorption solvent.

This invention relates to the field of environmental protection and organic waste resource utilization technology, and discloses an organic pollutant degradation device based on pear pomace-based biochar. The device includes a pretreatment unit, a biochar activation reactor, a multi-stage series degradation reaction mechanism, and a solid-liquid separation unit. A biochar regeneration unit is located above the biochar activation reactor. The inlet of the biochar activation reactor is connected to the outlet of the pretreatment unit. The inlet of the multi-stage series degradation reaction mechanism is connected to the inlet pipe of the organic wastewater to be treated. This organic pollutant degradation device and treatment method based on pear pomace-based biochar, by setting up a three-stage series gradient degradation reaction mechanism and combining the synergistic effect of biochar adsorption and persulfate advanced oxidation, can achieve efficient and thorough removal of recalcitrant organic pollutants, significantly improving the device's treatment load and resistance to shock loads.

This invention discloses a method for treating microplastics in water, belonging to the field of water environment management technology. This invention utilizes laser plasma to degrade microplastics. The laser plasma can not only directly act on the surface of microplastics to promote degradation, but also act on an iron substrate to generate iron / iron oxide nanoparticles adsorbed on the surface of the microplastics. These nanoparticles participate in the subsequent degradation reaction in the UV / H2O2 system. Compared with traditional Fenton reaction degradation, the pretreated microplastics show better degradation performance in the UV / H2O2 system, and can degrade PE microplastic particles into smaller particles more quickly, reducing the particle size to below nm.

The present application relates to wastewater treatment technical field, specifically to a kind of production process for treating high concentration PAM wastewater, comprising the following process steps: S1.modification degradation agent is added to degrader preparation tank, then it is transported to the mixer of degradation reactor by delivery pump;S2.high concentration polyacrylamide wastewater is transported to the mixer, and after mixing is completed, degradation reaction is carried out in degradation reactor;S3.by overflow pipe overflow to the layered zone of layered concentration tank and carry out layering, the clarified water of upper layer is sent to biochemical advanced treatment system;Lower layer sludge is settled to sludge concentration area and is further concentrated, and then concentrated sludge is transported to dehydration system by concentration delivery pump.The present application greatly reduces the COD and alpha-NH3 concentration of final effluent;Polyacrylamide and microcolloid material are rapidly degraded in early production, thereby greatly reducing the viscosity of wastewater, improving the capacity and efficiency of device;Dry matter in wastewater is efficiently separated.

The present application relates to the technical field of water treatment, and discloses a method for degrading and treating organic pollutants in a drainage basin, comprising: introducing drainage basin sewage with fluctuating flow and load, using a preset flow pattern of a flow distribution member to distribute the drainage basin sewage into a degradation flow direction and an overload flow direction, guiding the degradation flow direction to contact a multistage anaerobic biofilm attached to the surface of the filler to generate a degradation reaction, the preset flow pattern having a geometric interface that adjusts the flow area according to the water level, when the flow exceeds the preset load limit, a flow distribution ratio that increases nonlinearly with the rising water level is generated, so that the internal flow field shear stress of the main degradation zone is maintained within the adhesion strength threshold of the multistage anaerobic biofilm, the present application uses a physical pattern to preset the hydraulic distribution rule, ensures the adhesion stability of the biological community under the impact of runoff, and maintains the degradation activity of the system in a variable working condition environment.

A method for starch degradation includes the following steps. Acetylated adipic acid distarch, acid and polar solvent are mixed to form a starch suspension. The temperature of the starch suspension is adjusted to -23℃ to 47℃, and a degradation reaction is performed to form a first degraded starch solution. A base is added to raise the pH value of the first degraded starch solution to obtain a second degraded starch solution. The method for starch degradation has the advantage of simple process. A method for making an oil-proof composite layer includes the following steps. Acetylated adipic acid distarch with a weight average molecular weight of 3.00×10 6 to 5.50×10 7 and a polar solvent are mixed to obtain a starch solution. The starch solution is gelatinized to form a gelatinized starch solution. The gelatinized starch solution is attached to a substrate and a drying process is performed to form an oil-proof composite layer. The oil-proof composite layer has good oil-proof degree and can be applied to various packaging containers that require oil-proof isolation, especially food packaging containers, which has great industrial applicability.

The application discloses an enzyme composition for microplastic degradation, a preparation method and application thereof. The enzyme composition comprises plastic degradation enzyme and emulsifier. The emulsifier is selected from a combination of one or more of lignosulfonate, sulfobetaine emulsifier, fatty alcohol polyoxyethylene ether sulfate and C12-C18 alkyl polyoxyethylene ether sulfate. The application also provides a plastic degradation method, which comprises the steps of mixing plastic and the aforementioned enzyme composition, and performing a degradation reaction. The enzyme composition can be used for microplastic degradation, and has improved degradation efficiency and degradation activity. It is expected to be used in the environmental governance of microplastics.