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Method for pretreatment of sulfur-containing wastewater after refinery gas extraction by using activated refinery coke

A technology for wastewater treatment and petroleum coke, applied in the direction of adsorbed water/sewage treatment, etc., can solve the problems of large amount of oxidant, high activation temperature, high cost of high-concentration organic wastewater treatment, and achieve mild activation treatment method, wide operating conditions, activation and mild regeneration conditions

Inactive Publication Date: 2009-05-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of oxidant used in this method is relatively large, and the treatment cost of high-concentration organic wastewater is relatively high.
Zhang Huixin and others invented a method for preparing activated carbon with high specific surface area from petroleum coke in patent CN1406866A, but the activation temperature is as high as 600-1000°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 80-mesh petroleum coke into KOH solution with a concentration of 0.5wt%, the mass ratio of lye to petroleum coke is 1:1, let stand and soak for 4 hours. After soaking, the separated petroleum coke was calcined at 250°C for 2 hours in a muffle furnace. The roasted petroleum coke is washed with water at normal temperature, the pH value of the washed water is 8-9, and the washed petroleum coke is dried in an oven at 70° C. to obtain activated petroleum coke. Add activated petroleum coke to the waste water after air stripping, the mixing ratio of petroleum coke and waste water is v (waste water) / w (petroleum coke)=2:1 (mL / g), stir at room temperature for 30 minutes, then filter, and measure the waste water COD, the COD of treated wastewater is reduced from 4150mg / L to 1710mg / L.

Embodiment 2

[0035] Put 40-mesh petroleum coke into KOH solution with a concentration of 0.5wt%, the mass ratio of lye to petroleum coke is 1:1, let stand and soak for 2 hours. After immersion, the separated petroleum coke is roasted in a muffle furnace at 350°C for 8 hours, cooled to room temperature and washed with water. The pH of the washed water is 8-9, and the washed petroleum coke is Dry in an oven at 70°C to obtain activated petroleum coke. Add activated petroleum coke to the waste water after air stripping, the mixing ratio of petroleum coke and waste water is v (waste water) / w (petroleum coke)=2:1 (mL / g), stir at room temperature for 30 minutes, then filter, and measure the waste water COD, the COD of wastewater after treatment is reduced from 4150mg / L to 1130mg / L.

Embodiment 3

[0037] Put 40-mesh petroleum coke into a KOH solution with a concentration of 1.0 wt%, the mass ratio of lye to petroleum coke is 1:1, and let it soak for 1 hour. After soaking, the separated petroleum coke was calcined at 350°C for 6 hours in a muffle furnace. Cool to normal temperature to wash the roasted petroleum coke with water, the pH of the washed water is 8-9, and dry the washed petroleum coke in an oven at 100°C to obtain activated petroleum coke. Add activated petroleum coke to the waste water after air stripping, the mixing ratio of petroleum coke and waste water is v (waste water) / w (petroleum coke)=2:1 (mL / g), stir at room temperature for 3 hours, then filter, and measure the waste water COD, the COD of treated wastewater is reduced from 4150mg / L to 680mg / L.

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PUM

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Abstract

The invention provides an activation and regeneration method of petroleum coke, and a pre-treatment method for applying active petroleum coke to refinery waste water, particularly a method for reducing COD in sulfur-bearing waste water after the air lift of the refinery. The method comprises the following steps: carrying out alkaline activation treatment to petroleum coke in an alkaline aqueous solution, roasting the petroleum coke at 200-350 DEG C to prepare the active petroleum coke, using the prepared active petroleum coke to absorb organic containments in the water, and oxidizing the absorbed petroleum coke material at 200-350 DEG C so as to regenerate the active petroleum coke to be reused. The method provided by the invention can reduce the COD of waste water after the air-lift of the refinery by 60-90 percent.

Description

Technical field: [0001] The invention relates to a petroleum coke activation and regeneration method and a wastewater pretreatment method, in particular to a COD reduction method for sulfur-containing wastewater after gas stripping in an oil refinery. Background technique: [0002] Sulfur-containing wastewater after gas stripping in refineries is generally directly sent to sewage treatment plants for further treatment. However, when the nature of the crude oil processed by the refinery changes, the concentration of water-soluble organic matter in the sulfur-containing wastewater after gas stripping increases, resulting in a sharp increase in the COD of the wastewater. At this time, the wastewater needs to be pretreated to reduce its COD before entering the sewage treatment station. . [0003] The organic pollutants in the sulfur-containing wastewater after air stripping have the characteristics of high chroma, high toxicity, high water solubility, and difficult biodegradati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C01B31/02
Inventor 张庆轩杨国华杨普江刘金河
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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