SU1667912A1 - Ultra-filtration device - Google Patents

Abstract

The invention relates to membrane apparatuses for carrying out ultrafiltration processes and can be used for treating wastewater, concentrating various solutions in the chemical, food and other industries. The purpose of the invention is to increase reliability and simplify maintenance. The backflow flushing agent contains a hydropneumatic accumulator 14 connected to the filtrate discharge line 12 at the inlet through the check valve 15 and at the outlet through the vibratory interrupter 16. 4 Il.

Description

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The invention relates to membrane apparatuses for carrying out ultrafiltration processes and can be used for treating wastewater, concentrating various solutions in the chemical, food and other industries.

The aim of the invention is to increase reliability and simplify maintenance.

Figure 1 shows the hydraulic arrangement of the ultrafiltration device; figure 2 - section aa in figure 1; Fig. 3 shows a vibrator at the position of the spool at the initial moment of expiration of the filtrate; figure 4 - the same, with the extreme right position of the spool.

The dp ultrafiltration device contains a membrane apparatus 1, made of filter elements 2 sequentially interconnected, which are BTU-0.5 / 2 type ultrafilters 3, enclosed in housing 4, made in the form of a pipe with end caps 5 for supplying the initial liquid and removal of the concentrate and the hole 6 in the side wall of the housing 4.

The diaphragm unit 1 is connected at the inlet with the source liquid supply line 7, which includes the pump 8 and the intermediate tank 9, and at the outlet - with the concentrate removal line 10 with the valve 11 connected to the intermediate tank 9. The holes 6 are connected by a collector to the filtrate line 12 with the valve 13 at the end. A hydropneumatic accumulator 14 is connected at the section between the membrane unit 1 and the valve 13 to the filtrate discharge line 12, the check valve 15 is installed at the flow inlet, and the output is a vibratory interrupter 16 containing a valve 17 and an elastic element 18 with adjusting Vitim 19. A pressure gauge 20 is also installed on the pipe line to measure the pressure in the line 12 of the filtrate outlet.

The device works as follows

The initial liquid under pressure of 0.3–0.4 MPa flows through pipelines 7 into intermediate tank 9, from there pump 8 is fed into membrane device 1, passage through ultrafilters 3 of filter element 2, the filtrate enters the cavity of housing 4, from there through hole 6 - in line 12 of the filtrate outlet. The concentrate through the hole in the end cap 5 enters the following elements 2, in which the filtrate separates, which also enters the filtrate discharge line 12, due to the resistance in the ultrafilters, as well as

Due to the decrease in the amount of liquid exiting to the concentrate line 10 due to the withdrawal of the filtrate, the outlet pressure drops.

Specified Outlet Pressure

the membrane unit 1 is regulated by a valve 11, through which the concentrate is returned to the tank 9, from there it enters the membrane unit again. The ultra filtration process proceeds until a predetermined concentration of substances is reached in the tank 9, after which the concentrate is removed from the tank 9 using known devices (not shown). When the membrane unit 1 is on

5 surfaces of ultrafilter membranes 3 concentration of unfiltered substances increases, which leads to a decrease in membrane throughput due to concentration polarization.

0 To restore the permeability of the membranes, reverse flow is performed. To do this, overlap the line 12 of the filtrate with the valve 13. At the same time, the pressure in the line of the filtrate increases, the filtrate through the check valve 15 enters the accumulator 14, reducing the upper part of the air. After equalizing the pressure in the accumulator 14 and the membrane unit 1, the pump 8 is turned off and the pressure in the membrane unit 1 drops to zero. The compressed air in the upper part pushes the filtrate into the housing of the chopper 16 and the valve 17 under the influence of pressure in the exit cavity and the elastic element 18

5 begins to make a reciprocating movement, the speed of which depends on the pressure of the liquid and the degree of compression of the elastic element 18 by the screw 19. The filtrate flows in small portions

0 through the openings 6 into the internal cavity of the housing 4 and performs the back-flow washing of the ultrafilters 3. After the completion of the washing (monitored by indicators of the pressure gauge 20), the valve 13 opens and

5, the pump 8 is turned on for continued operation.

The proposed device does not require complex instrumentation, simplifies the maintenance of the device, reduces

0 the duration of the reverse flush, thereby increasing the productivity by 15-20%.

Claims (1)

The invention The device for ultrafiltration, co5 holding membrane apparatus with filter elements, feed liquid supply line, concentrate and filtrate drain lines with shut-off members and means for washing the membranes of filter elements, that, in order to increase reliability and simplify servicing, the membrane washing agent is designed as a hydropneumatic accumulator connected to a filtrate drain line with a check valve, and I 17  U /// 777 /, Figz Editor I.Gorn Compiled by N. Kekishev Tehred M. Morgenthal a vibratory chopper connected to the hydropneumatic accumulator by the input line and the output line to the filtrate drain line between the membrane unit and the pipe of the hydropneumatic accumulator. FIG. L L fim Proofreader T.Paly