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A method for treating reverse osmosis concentrated water by catalytic ozonation

A technology of reverse osmosis concentrated water and ozone oxidation, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., to achieve the effects of simple preparation method, improved mineralization degree and large specific surface area

Active Publication Date: 2016-01-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Peanut shell powder, as an agricultural waste, is often used to prepare carbonized materials to adsorb heavy metals and organic pollutants such as phenols, dyes, etc. In terms of reverse osmosis concentrated water, there has not been any report

Method used

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  • A method for treating reverse osmosis concentrated water by catalytic ozonation
  • A method for treating reverse osmosis concentrated water by catalytic ozonation
  • A method for treating reverse osmosis concentrated water by catalytic ozonation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Immerse peanut shell powder and 60% phosphoric acid solution at a solid-to-liquid g / g ratio of 1:2 for 14 hours, move the material liquid to a crucible and activate it in a muffle furnace at 550°C for 2 hours, cool, wash with 1% hydrochloric acid solution, and then use Wash it with ionized water until pH = 7, put it in an oven and dry it at 105°C to constant weight, pass through a 100-mesh sieve after grinding or ball milling, and obtain activated carbon from peanut shells. The scanning electron microscope results are shown in figure 1 (a is commercial activated carbon; b is peanut shell activated carbon). The surface physical and chemical properties of commercial activated carbon and peanut shell activated carbon were obtained by nitrogen low-temperature adsorption-desorption isotherm, as shown in Table 1. It can be seen that the peanut shell activated carbon has abundant pores and a large specific surface area.

[0022] Table 1

[0023]

Embodiment 2

[0025] The peanut shell activated carbon was impregnated with 5% Cu 2+ solution (solid-to-liquid ratio: 1:10), oscillated on a shaking table for 24 hours, filtered, dried in an oven at 105°C, and then baked in a muffle furnace at 400°C for 4 hours, crushed and sieved (100 mesh) after cooling, and prepared The catalyst was obtained, and the surface physical and chemical properties of the peanut shell activated carbon-supported metal ion catalyst were obtained by nitrogen low-temperature adsorption-desorption isotherm, as shown in Table 2. It can be seen that the specific surface area of ​​the prepared catalyst is increased.

[0026] Table 2

[0027]

Embodiment 3

[0029] Adjust the pH to 3, 5, 7, 9, and 11 in 2L of reverse osmosis concentrated water, add 8g of peanut shell activated carbon supported copper ion catalyst, pass ozone at the reaction temperature of 20°C, control the dosage of ozone to 30mg / L, and react After 60min, measure and calculate the removal rate of COD. The result is as figure 2 As shown, a is ozone oxidation alone (no catalyst), and b is ozone oxidation catalyzed by peanut shell activated carbon loaded with copper ions. It indicated that the addition of catalyst significantly promoted the degradation of pollutants in sewage.

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Abstract

A related method for processing reverse-osmosis concentrated water through catalytic ozone oxidation: dipping peanut shell powder in a phosphoric acid solution with the concentration of 60% according to the solid-liquid ratio of 1:1-1:3, transferring the material solution to a crucible for activation, cooling, washing with a hydrochloric acid solution with the concentration of 1%, washing with deionized water to get a pH value of 7, putting in a baking oven, baking at 105 DEG C to obtain a constant weight, performing grinding or ball-milling crushing and screening; dipping peanut shell activated carbon in a transition metal ion solution with the mass concentration of 0.1-10% according to a solid-liquid ratio of 1:1-1:10, baking to dry, roasting and grinding; adding into an ozone oxidation sewage processing system containing the reverse-osmosis concentrated water, and controlling the ozone oxidation sewage processing temperature to be 5-35 DEG C; and after processing is finished, separating out the peanut-shell-active-carbon-supported metal ion catalyst for next time of the catalytic process. The catalyst employed in the method is abundant in channel, large in specific surface area and more in surface active group, and has relatively strong adsorption and catalytic effects on organic pollutants in sewage.

Description

technical field [0001] The invention belongs to the technical fields of waste water treatment technology and environmental catalysis, and in particular relates to a method for ozonating reverse osmosis concentrated water by using peanut shell activated carbon loaded with metal ions as a catalyst. Background technique [0002] Reverse osmosis technology has the characteristics of good effluent quality and high recovery rate, and has been successfully applied to the reuse of industrial sewage. In refining and chemical enterprises, industrial wastewater enters the reverse osmosis process device after treatment, and the hardness ions and organic matter are removed to a large extent, and the effluent can be directly reused in the boiler. However, the reverse osmosis process produces a large amount of concentrated water, which not only has high salinity, but also contains high concentrations of toxic and harmful organic substances. Its direct discharge not only wastes water resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/78B01J32/00B01J35/10B01J21/18B01J23/72B01J23/745B01J23/34
CPCB01J23/34B01J23/72B01J23/745C02F1/725C02F1/78C02F2101/30C02F2305/02
Inventor 张华吴百春张晓飞邓皓刘光全罗臻王毅霖刘译阳李婷杨雪莹
Owner PETROCHINA CO LTD
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