Method for treating high-fluorine-content wastewater by utilizing fly ash

A fly ash and waste water technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of lack of large adsorption capacity, low-cost adsorbent, poor treatment effect and high treatment cost , achieve the effect of shortening the heating reaction time and improving the efficiency of fluorine removal

Inactive Publication Date: 2020-04-07
王永红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a method of using fly ash to treat high-fluorine-containing wastewater to solve the problems existing in the existing high-fluorine-containing wastewater defluorination technology, such as the lack of large adsorption capacity, low-cost adsorbents, and high treatment costs. Dealing with problems such as poor performance

Method used

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  • Method for treating high-fluorine-content wastewater by utilizing fly ash
  • Method for treating high-fluorine-content wastewater by utilizing fly ash
  • Method for treating high-fluorine-content wastewater by utilizing fly ash

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Embodiment 1

[0036] A method of utilizing fly ash to treat high fluorine-containing wastewater comprises the following steps:

[0037] a. Pretreatment of fly ash: get the fly ash to pick out the impurities mixed therein, use Raymond mill to grind the fly ash evenly, then pass through a 300 mesh sieve for subsequent use; get the pretreated fly ash (containing 47.8g SiO 2 and 40.2g Al 2 o 3 ) 100g and 500g concentration are 3mol / L sodium hydroxide solution (alkaline density is 1.12g / cm 3 ) in an open reactor at a reaction temperature of 95-100°C, a stirring speed of 100 rpm and a reaction time of 6 hours for a modification reaction, and then the reaction product is cooled and separated from solid and liquid by a centrifuge to obtain a modification Reactive solid phase and alkaline liquid, take the modified solid phase, filter and dry naturally to obtain modified fly ash; in step a, the modification reaction adopts electric heating or oil bath heating to heat the reactor ; The modificatio...

Embodiment 2

[0042] In step a, the liquid-solid ratio of sodium hydroxide solution and the fly ash after pretreatment is 4:1, and other technical schemes are the same as embodiment 1, and the fluorine removal rate is 81.9%.

Embodiment 3

[0044] The sodium hydroxide solution adopts 2mol / L in the step a, and other technical schemes are the same as embodiment 1, and the fluorine removal rate is 79.8%.

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Abstract

The embodiment of the invention discloses a method for treating high-fluorine-content wastewater by utilizing fly ash, and relates to the technical field of sewage treatment, wherein the method comprises the following steps: a, modifying the fly ash; b, adding a hydrochloric acid solution into the high-fluorine-content wastewater requiring to be treated to adjust the pH value to 5.5-6.5, adding the modified fly ash obtained in the step a, and carrying out mixing and stirring reaction at the temperature of 15-20 DEG C for 2 h; c, after the reaction in the step b is finished, standing and agingfor 1-2 h to separate slag from water; and d, adjusting the supernatant of the wastewater subjected to slag-water separation to be neutral by the alkaline solution in the step a, and discharging. According to the method, the industrial solid waste fly ash is modified, then the modified fly ash is adopted to treat the high-fluorine-content wastewater, high fluorine removal efficiency can be achieved, and the method has innovativeness and economical efficiency.

Description

technical field [0001] The embodiment of the invention relates to the technical field of sewage treatment, in particular to a method for treating high fluorine-containing wastewater by using fly ash. Background technique [0002] Fluorine is a trace element. Long-term drinking of high-fluorine water with a content greater than 1.5mg / L will have adverse effects on the human body, and serious cases will cause dental fluorosis and bone fluorosis. According to the national industrial wastewater discharge standard, the fluoride ion concentration should be less than 10mg / L. [0003] In recent years, through continuous exploration of some fluorine removal methods that have been formed, domestic and foreign academic circles roughly divide the commonly used methods into two categories, namely precipitation method and adsorption method. The performance of the precipitant in the precipitation method is the key. The disposal of pollutants by precipitation plays a vital role. The perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16C02F1/28B01J20/30C02F101/14
CPCB01J20/165B01J2220/4887C02F1/281C02F2101/14
Inventor 王永红石泽华徐景炎王丽珍
Owner 王永红
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