SU975584A1 - Process for purifying water from surfactants - Google Patents

Description

54) METHOD FOR CLEANING WATER FROM SURFACE VOLTAGE OF SUBSTANCES

The invention relates to wastewater treatment and can be used in the treatment of sanitary-hygienic waters containing PDB (group of soap ;, on closed complexes.

A known method of sewage treatment by processing them in an electric pallet of soluble electrodes using chloride metal 1 as a depassivator of chlorides 1.

The disadvantages of this method are the need, with a significant content of PLV, pre-conditioning, artificial water treatment, as well as a greater need for a reagent, x.

The closest to the technical essence of the invention is a method of filtering waste water on sorption columns with pre-treatment J3 nociOflhHoM electrical} ff) M field of aluminum electroplating at RP 6-9 2.

The disadvantage of this method is the passivation of the anode by a formative pdv sediment, its accumulation in the interelectrode gap, and with steady foaming, the blockage of the latter. This leads to a sharp drop in current,: .- flowing through the solution, the instability of the values.

pH in the range of 6-9, which reduces the quality of the treated water and the resource used sorbents.

The purpose of the invention is to reduce energy consumption for water purification and increase the life of the sorbent.

This goal is achieved by introducing sodium perchlorate to the concentration of 0.01-0.05 n before the electrolysis of the purified water, and after the electrolysis the water is passed through a mechanical fig.

Addition of sodium perchlorate to soluble LP increases their electro wired /.-, the molecular association factor 1a, while decreasing the potential and, consequently, the electrophoresis speed of micelles, which promotes the coagulation of PLV with the volume

20 solution. Specifically adsorbing perchlorate ions activate the aluminum surface, increasing its self-dissolving speed. This enhances the process of adsorbing soap micelles on

25 electrochemically produced hydroxides and improves the quality of the treated hearth. The choice of this salt instead of the traditionally used alkali metal chlorides is due to the change in the 3Q electrical conductivity of solutions based on

sodium perchlorate, and, consequently, lower energy consumption for water purification in the constant intensity of the electric field, higher exchange capacity of sorbents due to lower solvation of perchlorate-ion, as well as a high rate of hydrolysis, which is formed during the electrolysis of perrhporate alr 1ini.

The indicated concentrations are optimal. With an increase in the concentration of sodium perchlorate, an excessive amount of the gas phase, peptizing coagulated aggregates, and a decrease in the equilibrium value of a fair adsorption lead to a decrease in the degree of purification from surfactants and a decrease in the dynamics of the lecKofl sorbent capacity,

When the concentration of NaCl04 is below 0.01 and the cleaning effect and the life of the system are the same as in the known method,

The use of a filtration step is necessary to remove coagulated arpej-aive from surfactants, aluminum hydroxide and other particles that form a solid phase, in order to increase the capacity of the sorbent,

An example. Establish the activating effect of perchlorate ions in relation to the surface of al0, 2

6.0 1.5 0.2 0.2 22.5 0, 2 34.0 0.2 45.5 0.2 56 56.5

The absence of current on the film indicates the activation of the aluminum surface with perchlorate ions. Excellent results are also obtained for solutions with a concentration of 0.0 and 0.03 n.

PRI me R 2. They clean the water samples prepared specially for children with hygienic soap. The content of surfactants in water is 120 mg / l, pH 7. NaClO is added to water in a concentration of 0.01-0.05 and is directed at a rate of

mini 0.01-0.05 n. hrstvor and wastewater models H.I. their basis with a concentration of 200 mg / l .. C, this. The goal is that the total process, characterized by the dependence of the total current on the potential, is divided into the components of the current of the anodic solvent, gassing and formation of an oxide film. AMG-2 aluminum is polarized from a potentiostat P-5827 in a galvanostatic position in the range of current densities of 0–50 mA / cm.

The volume of gas released at the anode is contrasted every 2 minutes for 20 minutes and leads to normal conditions. At the same time, the gas is qualitatively analyzed on an LHM-8ML chromatograph. The rate of glutting is calculated from dannF1 gaometric measurements and converted into current units. The aluminum content in the solution is determined by. the photocolorimetric method is used every 5 minutes for 20 minutes using gshuminone as the complexavator. The dissolution rate is calculated from the time variation of the aluminum content in the solution and results in current units.

Table-1 presents data on the treatment of a 0.05 N solution and a model of waste water based on it.

Table

About About About About About

1 cm / min to the electrocoagulant unit, where the bottom of the electric field is 30 V / cm. After treatment and filtration through a foam elastomer, water is supplied to sorption columns with ion exchange resin and activated carbon.

In tab. 2 presents data on the purification of water from surfactants in a known manner and method with the preliminary introduction and subsequent filtration after electrotreatment through foam elastomer.

As follows from the table. 2, the implementation of the proposed method makes it possible to increase the quality of very good water in the test meters by an average of 25-30% and increase the lifetime of the sorbents by 11-25%.

Claims (2)

Invention Formula 1, a method for purifying water from surface-active substances, including electrolysis using aluminum electrodes, followed by passing water through a sorbent, characterized in that, in order to reduce the energy consumption for cleaning due to prevention, pass-. Table 2 electrodes, sodium perchlorate is added to the purified water before electrolysis to a concentration in 25 water equal to 0.01-0.05 n. 2. The method according to claim 1, I distinguish. As well, so that, in order to increase the life of the sorbent, after electrolysis, water is passed through 30 mechanical filter. I Sources of information taken into account in the examination 1. Babenkov V.D. Coagulant water treatment. M., Science, 1977, with. 244-248. 2. USSR author's certificate  865830, C 02 F 1/46, 1979 (prototype;.