Defluorination device without concentrated water discharge

Abstract

The invention discloses a defluorination device without concentrated water discharge. The device consists of a defluorination part and an automatic control part. According to the composition structure, a raw water tank is connected to a water inlet pump, an outlet is connected to a water inlet of an electro-adsorption reactor, parallel electrode plates are connected to positive and negative clamping grooves of the electro-adsorption reactor respectively, and the clamping grooves are connected to an electro-adsorption direct-current power supply through wires. The effluent water of the electro-adsorption reactor is connected to the intake water of an effluent water converter, and a purified water outlet of the converter is connected to a water outlet tank. A concentrated outlet of the converter is connected to a water inlet of an electro-flocculation reactor, which is equipped with a stirring area and a precipitation area, the upper part of the precipitation area is equipped with a water outlet, and the lower part is equipped with a sludge outlet. An output signal of a time relay is transmitted to a transition electrode unit to control the running or stop of the effluent water converter, a stirrer and an electro-flocculation direct-current power supply. The device combines electro-adsorption and electro-flocculation technologies, solves the problem of treatment of concentrated water generated in the electro-adsorption regeneration process, has high fluorine ion removal efficiency, and enables effluent water to reach the drinking water quality standard.

Description

technical field [0001] The invention belongs to water treatment technology, in particular to a treatment device for non-metallic ions containing fluorine in water. Background technique [0002] The lack and excess of fluorine in drinking water will cause harm to human health, and the impact of high fluoride groundwater on human beings is very common. According to statistics, more than 200 million people in the world drink excessive fluorine-containing water for a long time; when the fluorine content in drinking water is higher than 1.0 mg / L, long-term drinking will cause dental fluorosis and skeletal fluorosis; 6.0mg / L of water can cause severe fluorosis. In recent years, the harm of fluorine pollution to human health in groundwater in my country has gradually attracted widespread attention, and it is imminent to develop efficient and reliable fluoride ion removal devices. [0003] At present, the commonly used fluoride ion treatment methods in water at home and abroad mai...

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Problems solved by technology

[0003] At present, the commonly used fluoride ion treatment methods in water at home and abroad mainly include: (1) Precipitation method: use lime to form calcium fluoride precipitation to remove fluoride ions in water. The problem is that the fluoride ion concentration in the effluent is generally above 15mg / L Not suitable for drinking water treatment; (2) coagulation method: use iron salt and aluminum salt coagulation to remove fluoride ions, the disadvantage is that it is suitable for treating high-concentration fluorine-containing wastewater, and the removal effect of raw water with low fluoride ion content is poor; ( 3) Adsorption method: use an adsorbent to adsorb fluorine ions on the surface of the carrier to achieve the purpose of removing fluoride, the disadvantage is that the regeneration of the adsorbent is difficult and the reuse effect is poor; (4) reverse osmosis method: use the reverse osmosis membrane to separate the fluoride ions , the disadvantage is the need for complex pretreatment process, suitable for ultrapure water preparation

However, the biggest problem in this process is that after the anode and cathode plates are saturated with adsorption, a large amount of water needs to be used to wash the surface of the plates, and thus a large amount of drainage water containing high-concentration fluorine ions will be generated.

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