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Method for ozonizing organic matters in wastewater by using activated carbon structured catalyst

A technology of structured catalyst and activated carbon, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Problems such as large pressure drop in the bed

Pending Publication Date: 2021-02-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to provide a method for ozonating organic matter in waste water with activated carbon structured catalyst to solve the technical problems of large pressure drop in the catalyst bed and uneven mixing of gas, liquid and solid in the prior art

Method used

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  • Method for ozonizing organic matters in wastewater by using activated carbon structured catalyst
  • Method for ozonizing organic matters in wastewater by using activated carbon structured catalyst
  • Method for ozonizing organic matters in wastewater by using activated carbon structured catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example provides a preparation method of activated carbon structured catalyst C1.

[0040]Step (1): Take 5 pieces of cylindrical honeycomb activated carbon with a diameter of 50 mm and a length of 100 mm, and wash them with deionized water to remove floating ash on the surface. The washed honeycomb activated carbon was dried in an oven at 110 °C for 6 h. Here, the thickness of the honeycomb activated carbon is 1mm, the shape of the honeycomb orifice is square, and the volume density is 0.35g / cm 3 ~0.60g / cm 3 , the specific surface area is 500m 2 / g.

[0041] Step (2): Based on the mass of honeycomb activated carbon, load 1wt% Zr and 1wt% Ce. Weigh the mass of the dried honeycomb activated carbon to be 291.22g, absorb 1mL of solution per 1g of honeycomb activated carbon, weigh 39.73g of zirconium nitrate pentahydrate and 26.16g of cerium nitrate hexahydrate, and prepare 850mL of impregnation solution.

[0042] Step (3): immerse the dried honeycomb activated car...

Embodiment 2

[0044] This example provides a preparation method of activated carbon structured catalyst C2.

[0045] Step (1): Take 5 pieces of cylindrical honeycomb activated carbon with a diameter of 50 mm and a length of 100 mm, and wash them with deionized water to remove floating ash on the surface. The washed honeycomb activated carbon was dried in an oven at 110 °C for 6 h. Here, the thickness of the honeycomb activated carbon is 1mm, the shape of the honeycomb orifice is square, and the volume density is 0.35g / cm 3 ~0.60g / cm 3 , the specific surface area is 500m 2 / g.

[0046] Step (2): Based on the mass of honeycomb activated carbon, load 2wt% Zr and 2wt% Ce. Weigh the mass of the dried honeycomb activated carbon to be 290g, absorb 1mL of solution per 1g of honeycomb activated carbon, weigh 79.13g of zirconium nitrate pentahydrate and 52.10g of cerium nitrate hexahydrate, and prepare 850mL of impregnation solution.

[0047] Step (3): immerse the dried honeycomb activated carbo...

experiment example 1

[0049] The activated carbon structured catalysts C1 and C2 prepared in Example 1 and Example 2 were used to catalyze the ozone oxidation of methylene blue wastewater.

[0050] Before the experiment, the activated carbon structured catalyst was immersed in wastewater to make it fully absorbed and reduce the influence of activated carbon adsorption on the experimental results. Activated carbon structured catalysts C1 and C2 are filled into the ozone reaction column respectively, the filling volume is 980mL, and the filling height is 50cm (the inner diameter of the reactor is 5cm, the overall diameter of the honeycomb catalyst is 5cm, and the porous block catalyst is placed axially, organic Wastewater and ozone are continuously added from the bottom at the same time, and continuously flow out from the upper outlet), the methylene blue wastewater concentration is 500mg / L, and the water inflow is 2L / h. Change the influent ozone concentration, and record the experimental results as s...

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Abstract

The invention discloses a method for ozonizing organic matters in wastewater by using an activated carbon structured catalyst, and belongs to the technical field of sewage purification. The catalyst is composed of a carrier, an active component and an auxiliary agent, the carrier is honeycomb activated carbon, the active component is one or more of Mn, Fe, Co, Ni, Cu, Zn, Y and Zr, and the auxiliary agent is one or more of La and Ce. The preparation method comprises the following steps: (1) washing and drying the carrier; (2) preparing an impregnation liquid containing the active component andthe auxiliary agent; (3) placing the carrier in the impregnation liquid for impregnation to obtain a catalyst precursor; and (4) washing, drying and calcining the catalyst precursor to obtain the activated carbon structured catalyst. The catalyst is applied to treatment of organic wastewater, has the characteristics of small bed pressure drop, uniform gas distribution, small internal diffusion resistance, high COD removal rate and the like, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of wastewater treatment and catalysts, and mainly relates to a method for using an activated carbon structured catalyst to ozonate organic matter in wastewater, belonging to the technical field of sewage purification. [0002] technical background [0003] In the process of social development, a large amount of wastewater will inevitably be produced, and some wastewater will be discharged into surrounding rivers and underground without treatment, causing serious pollution to water bodies. The types and contents of organic matter in different types of wastewater are different. Compared with other pollutants, the treatment process of organic matter in wastewater is more difficult and complicated. At present, the commonly used wastewater organic matter treatment methods include biological and chemical methods. The biological method can use organisms to degrade the organic matter in the wastewater into small molecular sub...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/04C02F1/72C02F1/78C02F101/38
CPCB01J23/10C02F1/78C02F1/725C02F2209/08C02F2101/40C02F2101/30B01J35/56B01J35/653B01J35/651
Inventor 雷志刚朱吉钦王乐超桂成敏易珊
Owner BEIJING UNIV OF CHEM TECH
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