Treatment method for waste water containing fluorine

A treatment method and technology for wastewater, which are applied in energy wastewater treatment, water/sludge/sewage treatment, ion-exchanged water/sewage treatment, etc., can solve the problems of complex resin loading modification process, difficult industrial application, poor adsorption effect, etc. , to achieve the effect of closed loop treatment, low cost and easy operation

Active Publication Date: 2019-08-09
湖南中金岭南康盟环保科技有限公司
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Problems solved by technology

However, this method still has problems such as complex resin loading modification proce

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  • Treatment method for waste water containing fluorine
  • Treatment method for waste water containing fluorine
  • Treatment method for waste water containing fluorine

Examples

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Example Embodiment

[0062] Example 1

[0063] according to figure 1 The process flow chart shown for treating fluorine-containing wastewater, figure 1 It is a flow chart of the fluorine-containing wastewater treatment process provided by the embodiment of the present invention. The specific treatment steps include:

[0064] Add 17.5g AlCl to 10L fluorine-containing wastewater (fluoride ion concentration 250mg / L, pH value 5.0) 3 , Stir and mix for 10 minutes to obtain 10L of adsorbed liquid. Load 40g of chelating resin of formula (i) structure (n=1000) into the ion exchange column, and pass the adsorbed liquid through the exchange column at a flow rate of 5 mL / min. The residence time of the adsorbed liquid in the exchange column is 10 min. Outflow curve like figure 2 As shown, figure 2 It is the adsorption outflow curve of Example 1 of the present invention.

[0065] After the resin is saturated with adsorption, add 0.5 mol / L sodium hydroxide solution to the ion exchange column at a flow rate of 1 m...

Example Embodiment

[0067] Example 2

[0068] The difference from Example 1 is that the ion exchange column in Example 2 is a chelating resin (m=1200) of formula (ii). The experimental results show that when the fluoride ion concentration in the effluent penetrates (that is, the fluoride ion concentration is higher than 6 mg / L), the fluorine adsorption capacity of the chelating resin can reach 45.8 mg / g (dry resin).

Example Embodiment

[0069] Example 3

[0070] The difference from Example 1 is that AlCl is added to 10L of fluorine-containing wastewater 3 The mass of sodium hydroxide is 2.9g. During the adsorption step, the adsorption solution passes through the exchange column at a flow rate of 1 mL / min; during the desorption step, the concentration of sodium hydroxide solution passes through the exchange column at a flow rate of 0.5 mL / min. Experimental results show that the adsorption capacity of chelating resin for fluorine can reach 54.8 mg / g (dry resin).

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Abstract

The invention belongs to the field of treatment of waste water, and particularly relates to a treatment method for waste water containing fluorine. The treatment method comprises the following steps that a) the waste water containing the fluorine is mixed with aluminium salt to obtain to-be-adsorbed liquid; b) the to-be-adsorbed liquid flows through an ion exchange column filled with chelate resinfor adsorption exchange to obtain effluent, wherein the chelate resin is iminodiacetic acid resin and/or phosphoramidic acid resin. According to the method, by adding the aluminium salt, F- in the aqueous solution is transformed into an aluminum fluoride complex, then the selectivity of the chelate resin is utilized for adsorption to efficiently remove the fluorine, and the concentration of fluorine ions in the adsorption effluent can be lower than 6 mg/L. According to the method, it is not necessary to load metal ions such as aluminum on the chelate resin in advance, the problems are solvedthat a traditional resin loading modification process is complex, the consumption amount of aluminium salt is large, and the cost is high, and the method has the advantages that there is a small application amount of the agent (the aluminium salt), the operation is simple, the cost is low, and the adsorption effect is good.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for fluorine-containing waste water. Background technique [0002] Industrial fluorine-containing wastewater mainly comes from the production process of fluorine-containing raw materials, such as fluorine chemical industry, aluminum electrolysis industry, semiconductor industry, glass manufacturing industry, phosphate fertilizer production industry, etc. Excessive fluorine in water has serious harm to human body, soil, animals and plants. For example lead to acute poisoning of the human body or dental fluorosis and bone fluorosis. Restricted by economy and practicability, high-concentration industrial fluorine-containing wastewater is mainly treated by chemical precipitation process. The chemical precipitation method has the characteristics of simple method, convenient treatment, low cost and good effect, but the sludge after precipitation has high moistu...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F101/14
CPCC02F1/42C02F2101/14C02F2303/16Y02W10/37
Inventor 姜科周康根余承红潘希贤周惠彭佳乐杨有才
Owner 湖南中金岭南康盟环保科技有限公司
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