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

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.

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 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 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 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.