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Removal method for dissolved oxygen in recycled water

A technology of dissolved oxygen and high-pressure water, applied in chemical instruments and methods, water pollutants, degassed water/sewage treatment, etc., to achieve low operating costs, improve catalytic reduction performance, and promote uniform dispersion

Inactive Publication Date: 2019-01-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the removal of DO in reclaimed water after physical and chemical modification of ACF.

Method used

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  • Removal method for dissolved oxygen in recycled water
  • Removal method for dissolved oxygen in recycled water
  • Removal method for dissolved oxygen in recycled water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The raw activated carbon fibers were cut into small cubes of 0.5 cm × 0.5 cm, boiled in a boiling water bath for 30 min, the surface was rinsed with deionized water, repeated 3 times, and dried in a drying oven, recorded as ACF.

[0042] Take 5g of pretreated activated carbon fiber, put it in a high-pressure reaction kettle, add 200ml of deionized water, seal it, and raise the temperature to 270°C for pressurized hydrothermal modification for 3h. The modified activated carbon fiber was taken out after cooling down, and dried in an electric blast drying oven at 105°C to constant weight, which was denoted as GSACF.

[0043] figure 1 The infrared spectra of activated carbon fibers and modified activated carbon fibers are given. 3450-3400cm in the picture -1 The absorption peak at is attributed to -OH stretching vibration, 1580cm -1 The absorption peak at is attributed to C=O stretching vibration, 1340cm -1 The absorption peak at is attributed to the C-H bending vibrati...

Embodiment 2

[0049] Take 5g of pretreated activated carbon fiber, put it in a high-pressure reaction kettle, add 200ml of deionized water, seal it, and raise the temperature to 300°C for pressurized hydrothermal modification for 2h. The modified activated carbon fiber was taken out after cooling down, and dried to constant weight in an electric blast drying oven at 105°C.

[0050] Ni(NO 3 ) 2 As a precursor material, the precursor solution was prepared according to the theoretical copper loading of 8wt%, dropped into the modified activated carbon fiber at 16ml / g, ultrasonically treated for 30min, placed in a constant temperature oscillator, and oscillated under the conditions of 25°C and 150r / min 3h, after drying to constant weight at 105°C, put it in a quartz tube, under N 2 The combined modified activated carbon fiber catalyst was prepared by heating to 300°C and calcining for 3 h under atmosphere.

Embodiment 3

[0052] Take 5g of pretreated activated carbon fiber, put it in a high-pressure reactor, add 200ml of deionized water, seal it, raise the temperature to 250°C and pressurize hydrothermal modification for 2.5h. The modified activated carbon fiber was taken out after cooling down, and dried to constant weight in an electric blast drying oven at 105°C.

[0053] Ni(NO 3 ) 2 As a precursor material, the precursor solution was prepared according to the theoretical zinc loading of 15wt%, dropped into the modified activated carbon fiber at 16ml / g, ultrasonically treated for 30min, placed in a constant temperature oscillator, and oscillated under the conditions of 25°C and 150r / min 3h, after drying to constant weight at 105°C, put it in a quartz tube, under N 2 The combined modified activated carbon fiber catalyst was prepared by heating to 350°C and calcining for 2 h under atmosphere.

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Abstract

The invention discloses a removal method for dissolved oxygen in recycled water. The removal method comprises the following steps: enabling the recycled water with dissolved carbohydrazide to pass through a reactor filled with a combined modified activated carbon fiber catalyst; catalyzing carbohydrazide reduction at the low temperature of 40 to 50 DEG C to remove the dissolved oxygen in the recycled water, wherein the combined modified activated carbon fiber catalyst is a catalyst obtained by carrying out high-pressure hydrothermal modification treatment on activated carbon fibers, immersingand loading an active metal salt precursor and roasting. According to the removal method disclosed by the invention, the reaction temperature of the dissolved oxygen in the carbohydrazide and the recycled water is effectively reduced, and the removal effect of the dissolved oxygen in the recycled water is improved; the removal method is especially suitable for removing the dissolved oxygen in output water of three-grade treatment of a sewage treatment plant.

Description

technical field [0001] The invention belongs to the field of sewage treatment and comprehensive utilization, and relates to a method for removing dissolved oxygen in recycled water. The invention uses the modified active carbon fiber loaded with active metal as a catalyst to catalyze carbohydrazide reduction to remove dissolved oxygen in regeneration water. Background technique [0002] The contradiction between the supply and demand of water resources in my country is becoming more and more prominent, and the recycling and utilization of sewage has great significance and broad prospects. At present, urban sewage reclaimed water is mainly used for industrial water. Since the users are scattered, it needs to be transported by vehicles, which consumes a lot of manpower and material resources. Pipeline transportation and distribution of reclaimed water can effectively reduce the cost of reclaimed water reuse. However, the construction of a dedicated reclaimed water delivery p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/20C02F1/70B01J23/06B01J23/34B01J23/75B01J23/755B01J35/06C02F101/10
CPCC02F1/20C02F1/70B01J23/06B01J23/34B01J23/75B01J23/755C02F2101/10B01J35/58
Inventor 梁美生田晓峰袁杰王洁李龙陈一琛张峰
Owner TAIYUAN UNIV OF TECH
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