Movable fluorine-containing wastewater treatment method and device

Abstract

The invention discloses a movable fluorine-containing wastewater treatment method and device. The pH value of high-concentration fluorine-containing wastewater is regulated to be neutral or alkaline,CaCl2, PAC, magnetic seeds and PAM are added sequentially for treatment, precipitation is performed, and effluent is adsorbed. The device comprises a pipeline mixer, a NaOH dissolving tank, a calciumchloride dissolving tank, a mixing reaction tank, a chemical coagulation tank, a magnetic seed coagulation tank, a flocculation coagulation tank, a settling tank, a middle pool, an aluminosilicate adsorption tower, a regenerated wastewater storage tank, a coagulant dissolving tank connected with the chemical coagulation tank, a magnetic seed adding device connected with the magnetic seed coagulation tank and a flocculant dissolving tank connected with the flocculation coagulation tank, wherein the mixing reaction tank, the chemical coagulation tank, the magnetic seed coagulation tank, the flocculation coagulation tank, the settling tank, the middle pool, the aluminosilicate adsorption tower and the regenerated wastewater storage tank are sequentially connected with the pipeline mixer. Thedevice has the characteristics that the device occupies little land, is high in treatment capacity, takes effect rapidly and is low in energy consumption, easy to maintain and the like.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a movable fluorine-containing waste water treatment method and device. Background technique [0002] Fluorine is a trace element. Drinking water with a fluorine content of 0.4~0.6 mg / L is harmless and beneficial to the human body, while long-term drinking of high-fluorine water with a content of more than 1.5 mg / L will have adverse effects on the human body, causing lead to fluorosis. [0003] There are nearly 100 million people living in areas with high fluorine water in China, and there are tens of millions of fluorine victims in my country at present. In addition to natural factors in individual areas, the discharge of a large amount of fluorine-containing industrial wastewater is one of the main factors, such as fluorine-containing ore mining, metal smelting, aluminum processing, coke, glass, electronics, electroplating, chemical fertilizers, pesticides and other industr...

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Problems solved by technology

However, these methods have certain deficiencies. The commonly used lime precipitation method is to add milk of lime to the wastewater, so that fluoride ions and calcium ions can form CaF 2 However, this method has the disadvantages of large floor area, slow sedimentation of sludge, and difficulty in dehydration; the amount of sludge is large, and the fluorine in the sludge is difficult to recycle due to the high water content, and the pH of the effluent is high. The removal rate is low, less than 40%, and the effluent after treatment is difficult to reach the standard; the adsorption method has the disadvantages of small adsorption capacity of filter material, low treatment efficiency, and long treatment time. Some filter materials have reduced exchange capacity after regeneration, and poor reuse effect, etc. Disadvantages: Electrodialysis is seldom popularized in the treatment of industrial fluorine-containing wastewater because of large investment, high treatment cost, and high operating level requirements; the regeneration of ion exchange resin is complicated, and it is not suitable for the treatment of high-concentration fluorine-containing wastewater; Coagulation method, waste water treatment, high cost of chemicals, and the problem of secondary pollution by waste residues

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