SU399463A1 - METHOD OF CLEANING AQUEOUS SOLUTIONS - Google Patents

Description

one

The invention relates to the purification of aqueous solutions.

A known method of purification of aqueous solutions by electrolysis with a flowing electrolyte and a soluble anode, according to which the process is carried out at a current density of 100-125 a / 1M and a current concentration of 0.9-1 a / l, followed by filtration. The method provides effective cleaning of latex waste.

For the desulfurization of solutions according to my method, electrolysis is conducted by dripping a current of 0.1-90 a / iM with a volume density of current of 1-20 a / l and the velocity of the solution at the anode of 0.001-3 / m / s.

As the anode, aluminum, magnesium, copper, iron, and civc were fused.

After the electrochemical treatment, the solutions are filtered through 1 granulated activated carbon with a coarseness of 0.5–3 mm with an oxygen content of 2–50 m / h.

Method a-having tried on water with an injected dose of silver of 0.2-0.5 mg / l. The physicochemical composition of water is as follows: halls 3 bal., Prizhus 2 bal., Turbidity lo FEC-M-57 2: m: g / l, chromaticity 20 °, pH 6.8, alkalinity 0.7 1mge; sq / l, carbonate hardness 0.7 mgeq / l, total hardness 1.9 MEGeq / l, lermanganate oxidability 8.46 mg / l, chlorides 10, free acid acid 18 tmr / l, sulfates 37.63: m, g / l.

The treatment of the initial water with silver is carried out either with the aid of its aodon dissolution or with silver salts. The amount of silver in the "similar water and lacle of its electrochemical processing and filtration is determined by oligometric titration with dithizone, and the amount of aluminum, magnesium, iron, copper and dink is determined by colorimetric analysis with measurement of the optical density of the solutions on a FEC-60 photoelectric colorimeter.

The proposed method 1 can be carried out on an installation consisting of a flow cell and a filter loaded with granular activated carbon in which the spent sorbent is separated. The electrodes in the electrolyzer include three anads of aluminum, magnesium, copper, and iron sills and three 1-way of stainless steel or silver. Water containing a certain dose of silver is fed to the electrolyzer at a speed of 0.001-3 m / s, after which it is passed through a filter with granular activated carbon to remove the spent sorbent at a filtration speed of 2-50 m / h.

Example 1. Water containing silver of 0.2 mg / l (injected as AgNOs solution) is passed through an electrolyzer with a density of T01ka on aluminum-aluminum anodes of 5 mA / ohm. The flow rate of water through the electrolyzer varies from 0.5 to 0.083 m / s, and, accordingly, the dose of alumina varies from 0.5 to 3 mg / l. After elocation of coagulation, the water will be filyrutot through the layer of active / triggered ZTl. and residual silver is determined therein.

The results of the determinations are given in table. one.

Table 1

KAD activated carbon with a moisture content of 0.8–2 MM. Filtration speed 15 m / h. On the filter, water is supplied containing 0.5 MG / L of silver and a sintered electrolyzer with an aluminum anode. The current density at the aluminum anode is 5 mA / cm, the flow rate of water through the electrolyzer is 0.25 iM / cex. Dose alumina 1 M | g / l. The results are shown in Table. 3. From table. 3, it can be seen that, along with the effective separation of the suspension, it is purified from organic impurities by filtering through a carbon filter.

Table 3

Example 2. The process is carried out similarly to that described in example 1, but metal is used as the anode.

The results are given in Table. 2

Table 2 Example 1. This example illustrates the effectiveness of additional water purification that occurs during the separation of a spent sorbent in a filter loaded with a layer of 0.8 m. Subject of the invention 1. The method of cleaning aqueous solutions of electrolysis with a flowing electrolyte and a soluble anode followed by filtration, different By the fact that, in order to desperabre solutions containing silver, electrolysis is carried out at a current density of 0.1–90 a / m of bulk density of tOCa 1–20 a / l and the velocity of the solution at the anode is 0.001–3 m / s. 2. A method according to claim 1, characterized in that the filtration is carried out through granular activated carbon with a density of 0.5-3 mm at a speed of 2--50 m / h.