SU1116019A1 - Method of defluorinating deep-well water - Google Patents

Description

o: s The invention relates to a process for deflighting a well of artesian water and can be used in domestic drinking and industrial water supply. There is a known method of defluorization of wastewater by treating them in an electrolyzer with soluble aluminum electrodes Ql. A disadvantage of the known solution is the high energy consumption for cleaning. The closest to the invention in technical, substantive and achievable result is a method for deflightening artesian water, including their processing in a suspended layer with aluminum sulphate in the presence of a clay suspension at a flow rate of the stream being cleaned (upward flow rate) 1.2 2.0 mm / c, the clay concentration in the stream is 100–200 mg / l and the ratio of aluminum sulphate to clay is 1: 1 1: 0.5 2. The disadvantage of this method is the high consumption of deficient aluminum sulphate, which is more noticeable with an increase in fluorine content in and Khodnev water and its alkalinity. The purpose of the invention is to accelerate the process and reduce the consumption of reagents. The goal is achieved by the fact that according to the method of deflating vanity of artesian water, which includes treatment with aluminum sulphate in a suspended layer in the presence of a clay suspension at a ratio of aluminum sulphate and suspension: (0.5-1), the source water is electrocoagulated using Aluminum anodes to achieve a ftdr content of 30–40% of the original current density of 0.2–1 A / dm. The defluorination process is carried out as follows. The source water, which is characterized by high alkalinity and increased fluorine content, enters the diaphragm electrolyzer, where the flow separation is carried out. The acidification process and partial defluorination occur in the anode chamber. Catholyte is a partially defluorinated high-alkaline water, the volume of which does not exceed 10-15% of the total volume, and does not participate in further water treatment. The current density at the electrodes is maintained up to 1 A / dM. The anolyte with a reduced fluorine content enters the mixer, where aluminum sulphate and clay are fed, and deep defluorization is carried out. Allowing alkaline water to pH values of 6.9-7.3 and shallow electrochemical defluorization (for example, from values of 10–15 mg / l to 34 mg / l), which is carried out in a diaphragm electrolyzer, has an important advantage compared to deep, having The aim is to reduce the fluoride concentration of 0.8-1.5 mg / l, since the shallow defluoridation process can be carried out at low current densities (up to 1 A / dm) and thereby reduce power consumption and significantly increase the time of continuous operation of the electrolyzer. At the same time, the total consumption of reagents is reduced and there is no additional water loss. The data are given in the table. When using the proposed method, the consumption of reagents in terms of aluminum sulphate is 1015% lower than when using known methods

8.2

3.1

8.80 2.8

8.2 8.85

2.35

8.2 8.85 3.0

0.0 9.0

510

0.38

130

102 0.34 108

100 503 516

80,117 0,29

100

140 622 0.30

Table continuation

Claims (1)

. METHOD OF DEFLECTING ARTE-1 ZIANA WATER, including treating them with aluminum sulfate in a suspended layer in the presence of a clay suspension with a ratio of aluminum sulfate 'and suspension 1: (0.5-1), characterized in that, in order to accelerate the process and reduce the consumption of reagents processing, the source water is subjected to electrocoagulation using aluminum electrodes to achieve a fluorine content of 30-40% of the initial content at a current density of 0.2 - 1 A / DM ² . SU .., 1116019