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Process for treating nickel-containing wastewater with modified coal ash

A technology for fly ash and nickel wastewater, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc. The effect is remarkable, the cost is low, and the effect of avoiding secondary pollution

Inactive Publication Date: 2011-01-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0003] Waste fly ash from power plants can be used to treat nickel-containing wastewater, which is a method of treating waste with waste. However, the adsorption capacity of unmodified fly ash is low, and it cannot be used directly to treat nickel-containing wastewater. The emission requirements for nickel in the Comprehensive Emission Standard (GB8978-1996) (<1mg / l)

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  • Process for treating nickel-containing wastewater with modified coal ash

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Embodiment

[0011] The fly ash of Shidongkou Power Plant is modified by the present invention, and then the specific surface area of ​​the fly ash before and after modification is measured, and the results are shown in Table 1. It can be seen from Table 1 that the specific surface area of ​​the modified fly ash has increased many times.

[0012] Table 1 Comparison of specific surface area before and after modification of fly ash in Shidongkou Power Plant

[0013]

[0014] After modification by Shidongkou Power Plant, fly ash is used to treat nickel-containing wastewater. The concentration of wastewater is 216mg / L. The dosage is 5 grams per liter of wastewater, and the room temperature is 20°C. Stir and mix for 24 hours. The nickel content of wastewater after treatment is 0.528. mg / L, the removal rate reached 99.8%. Make the waste water meet the nickel discharge requirement (<1 mg / l) in the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996).

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Abstract

The invention discloses a method for treating nickel-contained wastewater through modified fly ash. 5g of the modified fly ash is added into 1L of nickel-contained wastewater; the ash and the wastewater are fully stirred and mixed, and are oscillated and react for 24 h at room temperature; after completing the reaction, mud and wastewater are separated from each other so as to complete the treatment on the nickel-contained water, wherein a preparation method for the modified fly ash comprises the following steps: preparing the mixed liquor of the fly ash and 2mol / L sodium hydroxide solution according to the solid-liquid ratio of 1 to 6; carrying out microwave reaction for 20 minutes at 85 DEG C; carrying out stirring reaction for 12h at 100 DEG C; after completing the reaction, cleaning the mixed liquor through deionized water and 95 percent ethanol; saturating the mixed liquor through 1mol / L sodium chloride; and finally obtaining the modified fly ash after drying at 110 DEG C. The modified fly ash has an obvious effect when being used for processing the nickel-contained wastewater with the concentration of 200 mg / L around.

Description

technical field [0001] The invention relates to a waste water treatment method, in particular to a method for treating nickel-containing waste water by using modified power plant waste fly ash. Background technique [0002] The industrial discharge of nickel-containing wastewater is large, which is prone to secondary pollution, and can enter the human body through the food chain, causing harm. At present, most of the nickel-containing wastewater is treated by the traditional chemical precipitation method. Although the discharge standard can be met, the amount of chemical agents is large and the cost is high. [0003] Waste fly ash from power plants can be used to treat nickel-containing wastewater, which is a method of treating waste with waste. However, the adsorption capacity of unmodified fly ash is low, and it cannot be used directly to treat nickel-containing wastewater. The emission requirements for nickel (<1mg / l) in the "Comprehensive Emission Standard" (GB8978-1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 周笑绿卢江涛
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER