54results about How to "Reduce invalid decomposition" patented technology

The invention discloses an in-situ repair method and system for heavy meal cadmium and polycyclic aromatic hydrocarbon polluted farmland soil. The method comprises the following steps: (1) spreading a mixture of carbon coated porous foamed iron subparticles, a peroxide and sodium phytate into polluted soil; (2) spraying a hydrogen peroxide solution into the polluted soil, concentrating and removing pollutants such as polycyclic aromatic hydrocarbon and heavy meal cadmium in the soil; and then recycling carbon coated porous foamed iron subparticles. The system comprises a material spreading device and a recycling device, the material spreading device comprises a material spreading moving rack, and the material spreading moving rack is provided with a mixture hopper, a hydrogen peroxide solution storage tank and a hydrogen peroxide solution spray head; the recycling device comprises a recycling moving rack, and the recycling moving rack is provided with a magnet recycling device and a foamed iron recycling tank. The method is simple in process, low in cost and high in continuity, the damage on soil microorganisms and organic matters is avoided, and the risk of secondary pollution does not exist.

The invention discloses a device and method for treating pulping wastewater by a Fenton catalytic oxidation method. The device comprises a water collecting tank, a catalytic oxidation tower, a neutralization tank, a coagulative precipitation tower, a clean water tank and a medicament preparation system, wherein a balance regulating tank at the top of the catalytic oxidation tower is connected with the water collecting tank through a pipeline; the balance regulating tank is connected with a water distribution pipe at the bottom of a fluidized catalytic reaction column of the catalytic oxidation tower through a pipeline; a circulating water outlet tank is connected with the water distribution pipe through a pipeline; the neutralization tank is connected with a water distribution pipe of the coagulative precipitation tower through a pipeline; an outlet water tank is arranged on the external wall of the upper part of the coagulative precipitation tower, and the top of the coagulative precipitation tower is connected with the outlet water tank through an overflow port. The method comprises the steps of carrying out balance regulating treatment, carrying out fluidized catalytic oxidation treatment, carrying out coagulative precipitation and purifying. According to the device and the method, by using efficient mass transfer efficiency under fluidized conditions, a relatively high wastewater treatment effect is achieved under the condition that the dosage of hydrogen peroxide and ferrous ions is relatively low, so that the wastewater treatment efficiency is increased, and meanwhile, the amount of generated sludge is reduced.

The invention provides a method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding, which comprises three feeding processes and comprises the following specific steps: in the first feeding process, preparing a degumming solution from surfactant, a fiber expanding agent, peroxide stabilizer, a defoaming agent, sodium hydroxide, peroxide and water, mixing raw hemp of ramie and the degumming solution to form a degumming solution system, and heating to remove part of colloid; in the second feeding process 20-50 minutes later, adding peroxide and sodium hydroxide, and keeping the temperature to further remove the colloid; in the third feeding process 20-50 minutes later, adding peroxide, and further keeping the temperature until the reaction is finished and the colloid is completely removed; and finally, washing refined dried hemp fibers with clear water, oiling, drying, opening, and combing to obtain the prepared ramie fibers. The method provided by the invention overcomes the defects in the existing oxidation and degumming technology; a repeated multiple-step method is used, so that the reaction is uniform and moderate, the damage to the fibers caused by over too high initial concentration of initial concentration is reduced, and the quality of the refined dried hemp product is improved; and meanwhile, the ineffective decomposition of the peroxide and the consumption of the defoaming agent are reduced, thereby saving the cost.

The invention relates to a method for alkaline hydrogen peroxide bleaching of paper pulp. Chitosan with deacetylation degree bigger than 80% is added in the alkaline hydrogen peroxide bleaching process of high yield pulp or deinked pulp to act as the stabilizer of the hydrogen peroxide, and the dosage of the chitosan is 0.5-5kg per ton pulp; and hydrogen peroxide, sodium hydroxide and sodium silicate are added at the same time of bleaching. By adding chitosan in the alkaline hydrogen peroxide bleaching of the paper pulp, the method can improve the bleaching efficiency of the hydrogen peroxide and the whiteness of the paper pulp.

A Fenton fluidized bed reactor and an operation method thereof are disclosed. The reactor includes a reactor shell, an inlet flow pattern distributor, a reflux flow pattern distributor, a hydrogen peroxide flow pattern distributor, a separating plate, a three-dimensional filter, a reflux pump, a water feeding pump, a pipeline mixer, an acid adding pump, a ferrous adding pump and a hydrogen peroxide adding pump. The reactor is uniform in water distribution and does not need additionally added power for stirring, thus saving the operation electric charge, reducing ineffective hydrogen peroxide decomposition caused by violent stirring and reducing the using amount of the hydrogen peroxide. The hydrogen peroxide and the ferrous sulphate are added separately, thus reducing ineffective consumption of agents. Active catalytic crystals are formed. The yield of iron-containing sludge is reduced.

The invention relates to a continuous synthesizing process of epichlorohydrin. Specifically, a kettle type reactor and a circulation flow reactor are connected in series; different ratios of hydrogenperoxide are added in stages for reaction; different temperatures and times are controlled; a product directly enters a closed type scraper centrifugal machine to separate out a catalyst and a reaction liquid after the reaction is ended; the reaction liquid is layered to obtain an oil layer and a water layer; chloropropene and the separated catalyst are recycled and pulped to return to a reactionsystem; continuous catalytic operation of the catalyst is realized.

The invention discloses a Fenton cooperated ozone fluidized catalytic oxidation waste water treatment device and a waste water treatment method thereof. The device comprises a pretreatment tower (9), a catalytic oxidation tower (1), an aftertreatment tower (27), an agent preparation system (30), an ozone supply system and a clear water pool (29). The waste water treatment method of the device comprises the following steps of 1, pretreatment; 2, catalytic oxidation treatment; 3, aftertreatment. By means of the waste water treatment method of the device, waste water treatment efficiency is improved, the removal effect of COD and chroma of waste water is improved, meanwhile, the use amount of a chemical reagent is reduced, sludge output is reduced, the ozone utilization rate is increased, and the waste water treatment cost is reduced.

The invention relates to catalytic type packing for a Fenton fluidized bed and a preparation method of the catalytic type packing and belongs to the field of wastewater treatment. The catalytic type packing for the Fenton fluidized bed comprises porous suspended packing and a catalyst layer, wherein the porous suspended packing is covered with the catalyst layer; the catalyst layer comprises components as follows: metal salt with Fenton reaction catalytic activity, activated carbon and a binder, a weight ratio of the metal salt, activated carbon and the binder is (0.3-1.2):6:(1.0-1.5), and the metal salt loaded on activated carbon is 5%-20%. The catalytic type packing for the Fenton fluidized bed has a huge catalytic area, can effectively increase oxidation efficiency and utilization rate of hydrogen peroxide, can reduce invalid decomposition of hydrogen peroxide and reduce output of iron-containing sludge, so that sewage treatment effect is improved, and the added amount of chemical and operating cost are reduced.

The present invention relates to preparation process of alkyl amidopropyldimethyl amine oxide as surfactant. The preparation process includes the reaction between alkyl amidopropyldimethyl amine and hydrogen peroxide solution of 20-90 % concentration at 60-90 deg.c and in the presence of EDTA, citric acid, sodium citrate and sodium bicarbonate as catalyst for 2-4 hr to obtain alkyl amidopropyldimethyl amine oxide solution of 30 % or higher concentration in the conversion rate over 99.5 %. The prepared alkyl amidopropyldimethyl amine oxide may be used as surfactant widely used in detergent, cosmetics, textile assistant, medicine and other fields.

A reducing and bleaching composition for decoloured waste pulp is prepared from sodium dithionite (5-15 wt.%), chelating agent (1.25-15), sodium carbonate or sodium hydroxide or their mixture (0.25-3) and water (79.5-93.5) through uniform mixing. Its bleaching method features that the stabilizer and said composition are cooperated, and the oil or solvent not dissolved in water is added to isolate air, so improving the stability of bleaching liquid, reducing consumption of sodium dithionite and improving bleaching effect. Its advantages include less damage to strength and opaqueness of paper fibres, less corrosion to pipeline, less pollution and low cost.

The invention discloses an in-situ remediation method and system for farmland soil contaminated by a plasticizer and heavy metal lead. The method comprises the following steps that (1) fine carbon-coated porous foam iron particles modified by ethylenediamine tetraacetic acid and a mixture of peroxide and sodium phytate are spread into the contaminated soil; and (2) a hydrogen peroxide solution is sprayed into the contaminated soil, the plasticizer, the heavy metal lead and other pollutants in the soil are enriched and removed, and the fine carbon-coated porous foam iron particles modified by the ethylenediamine tetraacetic acid are recycled. The system comprises a material spreading device and a recycling device. The material spreading device comprises a material spreading moving frame which is provided with a mixture hopper, a hydrogen peroxide solution storage tank and a hydrogen peroxide solution spray head. The recycling device comprises a recycling moving frame which is provided with a magnet recycling device and a foam iron recycling tank. According to the in-situ remediation method and system, the process is simple, the cost is low, the sustainability is high, microorganisms and organic matter in the soil are avoided from being damaged, and secondary pollution risks are avoided.

The invention discloses an integrated fluidized catalytic oxidation tower and a method for deeply treating wastewater by using the same. A balance adjusting unit of the catalytic oxidation tower is connected with a water distribution pipe at the bottom of a catalytic oxidation unit through a pipeline; the outer side of the upper part of the catalytic oxidation unit is provided with a circulating water tank, the outer side of the circulating water tank is provided with an intermediate water tank, and the top of the circulating water tank is connected with the intermediate water tank through an overflow port; the intermediate water tank is connected with a water distribution pipe of a coagulation sedimentation unit through a pipeline, and a water collecting basin is connected with the balance adjusting unit through a pipeline; the balance adjusting unit is connected with the water collecting basin through a first overflow pipe, and the intermediate water tank is connected with the water collecting basin through a second overflow pipe; a water outlet of a water outlet tank is connected with a clean water basin through a water outlet pipe. By using the integrated fluidized catalytic oxidation tower, the mass transfer efficiency and the chemical reaction speed are effectively increased, the oxidative degradation effect for organic pollutants in wastewater is improved, the dosage of a Fenton reagent can be reduced, and the yield of chemical sludge in the later coagulation process can be reduced.

The invention discloses a novel low-temperature oxygen bleaching catalyst and a preparation method and application thereof. The low-temperature oxygen bleaching catalyst includes clay and a hetero-binuclear Schiff base complex loaded on the clay. The low-temperature oxygen bleaching catalyst is used for bleaching cotton-type fabric and is low in consumption and great in bleaching effect. Comparedwith a traditional 98 DEG C process, the catalyst has the advantage that the whiteness of the bleached fabric is slightly higher, energy consumption is significantly reduced at the low temperature of60-80 DEG C, the strength drop rate of the fabric is not higher than 10%, and fiber damage is smaller; a working raffinate after bleaching is neutral, thus there is no need to carry out acid neutralization and water washing, and the process flow is decreased. The catalyst is stable in structure, and it is proved by a same process for testing the performance of the catalyst after the catalyst is placed for six months that the bleaching effect of the catalyst has no obvious decline.

The invention discloses a Fenton fluidization wastewater treatment device and a wastewater treatment method thereof. The device includes a water collection pond (8), a pretreatment tower (13), a fluidization reaction tower (1), a post-treatment tower (26), a reagent preparation system (29) and a clear water pond (28). The wastewater treatment method includes the following steps of 1 pretreatment, 2 Fenton fluidization treatment and 3 post-treatment. The wastewater treatment method can reduce the consumption of chemical reagents, the costs can be reduced, and a treatment effect can be improved.

The invention discloses a Fenton synergistic ozone wastewater treatment device and a wastewater treatment method thereof. The device comprises a pretreatment tower (9), a catalytic oxidation tower (1), an aftertreatment tower (27), a chemical reagent preparation system (30), an ozone supply system and a clear water tank (29). The wastewater treatment method of the device comprises the following steps: (1) pretreatment; (2) catalytic oxidation treatment; and (3) aftertreatment. By adopting the device for wastewater treatment, the wastewater treatment efficiency can be raised, the removal effect of COD and chroma of the wastewater is improved, the dosage of chemical reagent is reduced, and the ozone utilization rate is high.

The invention provides an organic coated denitration agent and a preparation method thereof, and the preparation method comprises the following steps: melting urea, mixing with a catalyst, and carrying out granulation molding to obtain spherical particles; and putting the obtained spherical particles into coating equipment, uniformly rotating the spherical particles, and spraying isocyanate and polyhydric alcohol for coating to obtain the organic coated denitration agent. According to the method, the catalyst is added in the forming process of the urea denitration agent, it is guaranteed that the catalyst is distributed in all local areas when the denitration agent is used, the denitration effect is improved, and the denitration efficiency is improved; according to the method, the surfaces of formed particles are subjected to surface modification in a coating mode, a polyurethane polymeric membrane is formed, the polyurethane polymeric membrane has a slow release effect, invalid decomposition of urea in the denitration process is reduced, the polyurethane polymeric membrane is fully used for reduction of nitric oxide, and the urea utilization rate is increased; the method is simple in operation steps, wide in raw material source, low in equipment investment and production cost and easy to industrially implement.

The invention discloses an efficient wastewater treatment device for papermaking process tobacco leaf regeneration and a wastewater treatment method thereof. The device comprises a water-collecting pool (9), a pretreatment tower (14), a catalytic oxidation tower (1), an aftertreatment tower (28), an agent preparation system (34), an ozone supply system and a clear water pool (33). The wastewater treatment method includes the following steps that (1), pretreatment is carried out; (2), catalytic oxidation treatment is carried out; (3), aftertreatment is carried out. By the utilization of the wastewater treatment method, wastewater treatment efficiency is improved, the quantity of consumed chemical agents is reduced, the removal effect of the wastewater COD and color degree is improved, the utilization rate of ozone is increased, and wastewater treatment cost is lowered.