SU990662A1 - Process and apparatus for electrically dehydrating heterogeneous liquid systems - Google Patents

Description

AC field, with a frequency of 0.05-45 kHz.

At the same time, before removing the sediment.

Moreover, a device for carrying out the method, comprising an anode, a cathode and a loading container with a convex slot, is provided with an endless filtering tape mounted on the shafts under the loading capacity, an alternating current source and electrodes connected to it located in the loading capacity, the front wall of which is installed with vertical movement, with the cathode made in the form of a metal perforated tape and paq is placed under the infinite tape, and the anode is made in the form of plasticity set under the infinite echnoy cantilevered ribbon and designated by the outlet slit ..

The device is provided with a forcing drum mounted above the endless belt on the side opposite to the location of the loading container and connected to the shaft of the endless belt.

The drawing shows a diagram of the device for electrically dewatering inhomogeneous liquid systems.

The device contains a loading container 1 in which electrodes 2 are installed to create an alternating current field, they can be rigidly fixed to the walls of the vessel 1, the front wall 3 of the vessel 1 is movable with the possibility of adjusting the height of the outlet slit and voltage regulator 4 to which the electrodes are connected 2. The belt conveyor 5 is made in the form of an endless filtering belt for moving and sludge dewatering, on both sides of the upper branch of which electrodes are located: cathode b and anode 7 to create a field constant about current. Moreover, the upper electrode is fixed on the side of the loading tank. An endless belt is mounted on the shafts 8 and 9 of the electric drive 10 to ensure the movement of the belt. A spin drum 11 and a collection container 12 are installed above your 9.

The device works in the following way.

A non-uniform fluid entering the loading tank 1 with elec- trodes 2 is subjected to short-term treatment (1 min) with an alternating current field of 50–380 V with an industrial frequency of 50 Hz or 13–45 kHz low frequency ultrasound.

At the same time, depending on the magnitude of the field intensity, the redistribution of the forms of the bond of water with solid particles or occurs. their complete gap. In this case, the chemically bound water passes into the free one, and the solid particles (fiber, etc.) fill the free bonds, become larger, forming large conglomerates, which are picked up by a conveyor belt 5 from a cloth or any other filter material. Further, the conglomerate evenly enters the interelectrode space formed by the metal mesh cathode b and the anode 7 of insoluble material freely floating at an angle towards the rear wall. The moving wall 3 of the tank 1 with the electrode, which regulates the thickness of the layer fed to the electrokinetic treatment (by electrophoresis and electroosmosis). As a result of this operation, an alternating current field overcomes the barrier that prevents the concentration and dehydration of heterogeneous liquid systems. In addition, the effects of defoaming and disinfection of the resulting product and water occur.

The resulting concentrate may be with a moisture content of 30% and below. The movable rear wall 3 of the loading tank 1 with the electrode 2 and the electrode floating at some angle to the latter allows to solve the issue of high performance and reduction of electric power consumption in the range of 0.51.5 kWh / t of absolutely dry matter against 32 kWh / m by the known way.

The experiments were conducted on dehydration, fiber reinforcement and foam and sediment disinfection of the Kiev factory of technical papers.

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

Ie tables vi | (but, as effective dewatering pv) s and sediment, enlargement of the fiber and their disinfection. within the specified frequency range sex. In addition, it follows that the increase in the effect of foam dewatering and sediment | 1 is increased on the fiber at a frequency of 0.0545 kHz (for other | 1X equal conditions) according to example 2, 3, 4. Examples 1, 5 (negative "To illustrate the effectiveness of dehydration - with

Humidity,%

Way

non-compliance with the claimed frequency range.

Example. The experiment was carried out on the concentration and dehydration of technological foam and sediment of cardboard production at the Kiev factory of technical papers.

The initial inhomogeneous liquid of the known and proposed method has a humidity of 98%. The measurement results are shown in Table. 2

Table 2

Voltage, V

Example 2. Osh1t was carried out by concentrating and foaming foam and sediment after electrocoagulum: cardboard paper production from the Kiev factory of technical papers. OutcomeHumidity,%

Way

Voltage, V

Example 13 .. The experiment was carried out on the concentration and dehydration of foam and sediment from fuel-fluorocoagulation of cardboard, produced by the Kiev factory of technical papers.

on a heterogeneous liquid known and the proposed method has a moisture content of 98%.

The measurement results are shown in Table. 3

Table -3

The original heterogeneous fluid known and the proposed method had a moisture content of 98%. The measurement results are shown in Table. four

Way

The results of the comparative results shows that the proposed method allows comprehending the dehydration of inhomogeneous liquid systems (sediment, foam) up to 30-40% humidity ripOTHB 80-90% by a known method.

The use of the proposed method and device for processing heterogeneous liquid systems of pulp and paper production provides, in comparison with existing methods of fiber recovery and water into production, to drastically reduce energy consumption and eliminate the closed cycle of water use and wastewater treatment by providing deeper sludge dewatering, intensifying the process and disinfecting water in the process of electrical treatment.

Claims (1)

1. Granovsky MG, Lavrov Y.M., Smirnov O.V. Electrical processing liquid. - Chemistry, 1976, 1, p. 115,124.  5 S7 %