RU48967U1 - FLOTATION SEWAGE TREATMENT DEVICE - Google Patents

Abstract

The utility model relates to the field of food industry and can be used for various enterprises, and specifically, for enterprises of the fishing industry, for flotation treatment of wastewater from suspended particles, fats and other pollutants.

The utility model solves the problem of increasing functional reliability, quality indicators of the water treatment and disposal of waste water products. To obtain the required technical result, it is proposed in a device for flotation wastewater treatment, including a column for pressure flotation of wastewater, annular containers for collecting foam, connected by pipelines for draining foam, a pressure tank designed to saturate the air with drains, a settling tank for collecting sludge, a pipe for draining purified water install: electroflotation column for wastewater treatment; a screw device located in a perforated housing for separating the liquid phase from the processed fish products, connected to the sump by an exhaust pipe with a valve controlled by a sensor for separating the liquid phase and sediment; tank for collecting dehydrated sludge; tank with an inclined bottom for. collecting a liquid phase flowing out of a screw device equipped with a liquid level sensor; a pump for supplying a liquid phase for further purification to a pressure flotation column (pre-treatment column); pump for supplying treated wastewater to the pressure tank.

Description

The utility model relates to the field of food industry and can be used for various enterprises, and specifically, for enterprises of the fishing industry, for flotation treatment of wastewater from suspended particles, fats and other pollutants.

A known installation for flotation wastewater treatment from oil products, fats, suspended particles in a complex apparatus (RF patent 2182117, IPC C 02 F 1/24), formed by two process columns - column flotation of wastewater and a column of fine water treatment, which is based on tubular sump, communicating with each other through the base of the apparatus - sump. The sump is a tank in the form of a parallelepiped, divided into two halves by an internal vertical partition, having the shape of an irregular pyramid, tapering to the bottom and ending with an outlet pipe with a valve for sludge.

This installation has the following disadvantages:

- the installation contains a tubular sump, ineffective in the treatment of fat and protein-containing wastewater of fish processing enterprises;

- drainage of sediment containing processed fish products is accompanied by unregulated discharge of liquid;

- the installation does not allow to separate the sediment into processed fish products and the liquid phase, does not provide for the possibility of further purification of this liquid phase.

The utility model solves the problem of increasing functional reliability, quality indicators of the water treatment and disposal of waste water products.

To obtain the desired technical result, it is proposed in a device for flotation wastewater treatment, including a column for pressure flotation of wastewater, annular containers for collecting foam, connected

pipelines for the removal of foam, a pressure tank designed to saturate the effluent with air, a sedimentation tank for collecting sludge, a branch pipe for the removal of purified water, install:

- electroflotation column for wastewater treatment;

- a screw device, located in a perforated housing, for separating the liquid phase from the processed fish products, connected to the sump by an exhaust pipe with a valve controlled by a sensor for separating the liquid phase and sediment;

- a tank for collecting dehydrated sludge;

- a tank with an inclined bottom for collecting a liquid phase flowing out of a screw device equipped with a liquid level sensor;

- a pump for supplying a liquid phase for further purification to a pressure flotation column (pre-treatment column);

- a pump for supplying treated wastewater to the pressure tank.

Figure 1 shows a diagram of the proposed installation. The following notation is accepted:

1 - foundation foundation; 2 - racks; 3 - sedimentation tank; 4 - a vertical partition; 5 - column pressure flotation of effluents; 6 - column electroflotation of effluents; 7 - block of electrodes; 8 - pipeline for supplying a saturated air-water mixture from the pressure tank; 9 - pipeline for supplying effluents; 10, 11 - annular containers for collecting foam; 12, 13 - pipes for the removal of foam; 14 - pipeline for the disposal of treated wastewater; 15 - valve; 16 - auger device; 17 - tank for collecting partially dehydrated sludge; 18 is a tank with an inclined bottom for collecting the liquid phase flowing from the screw device; 19 is a pump for supplying a liquid phase to the column 5; 20 - pipeline for supplying water from the tank 18 to the pressure flotation column; 21 - check valve that prevents the discharge of waste water into the tank 18; 22 - pressure tank, 23 - pump for supplying treated wastewater to the pressure tank; 24 - pressure reducing valve; 25 - the sensor of the separation of the liquid phase and sediment; 26 - liquid level sensor.

A device for flotation wastewater treatment is a complex apparatus in the form of a communicating vessel formed by two

technological columns - a column of pressure flotation of drains and a column of electroflotation water treatment, communicating with each other through the base of the apparatus - settler 3. The settler is installed on four racks 2, and the racks are installed on four foundation bases 1. The settler is a tank divided into two halves of the internal vertical a partition 4. In the lower part of the sump in the bottom, tapering downward, an opening is formed for the flow of water from the pressure flotation column 5 to the electroflotation cleaning column 6. From toynik has a latch 15 for discharging sludge and an outlet pipe connected with a screw device 16 for partial dewatering of sludge and move it to the tank 17 to collect the precipitate.

A collapsible technological column of pressure flotation 5 is installed vertically on the left half of the sump to its upper wall coaxially with an opening for the flow of water from the flotation column to sump 3. A pipe 8 is mounted inside this column to supply saturated air-water mixture from the pressure tank 22. Above the pipe 9 is inserted into this pipe for supplying untreated wastewater. Below the upper edge of the flotation column 5, a widened annular tank 10 with an inclined bottom is fixed to collect foam and drain it through an inclined pipe 12.

In parallel with the pressure flotation column 5, on the upper wall of the right half of the sump 3, a collapsible technological column for electroflotation water treatment is installed vertically 6. A block of electrodes 7 is located in the electroflotator chamber, on which surface gas bubbles are emitted. The top of the column is made with an annular tank 11 of a larger diameter for collecting foam and is equipped with an inclined pipe 13 for its removal.

Installation works as follows.

The untreated wastewater is fed into the pressure flotation column 5 through line 9 and at the same time wastewater is supplied through a pressure reducing valve 24 via line 8 previously saturated with air in the pressure tank 22. Air-saturated water is supplied to the flotation chamber 5, where air bubbles released from the wastewater together with

particles of suspended solids and fat rise upwards, foaming, are collected in a container 10 for collecting foam and gradually gravity away through the pipe 12.

In sedimentation tank 3, heavy particles, whose density is greater than the density of water, descend under their own weight and settle to the bottom.

The purified water, moving first downward in the pressure flotation column 5, and then flowing through the bottom of the sump 3, changes the direction of movement in the opposite direction - upwards and enters the electroflotation water treatment column 6, where the water is treated. In the electroflotation column 6, due to the electrolysis of water, air bubbles are released, which, together with particles of suspended and colloidal substances and fat, rise up, foaming, collect in a container 11 for collecting foam and are gradually gravity-discharged through a pipe 13.

The purified water is discharged from the electroflotation water treatment column 6 through a pipe 14, while part of the water is taken by means of a pump 23 to a pressure tank 22 (not shown in the diagram), where it is saturated with air.

Sludge obtained during flotation of sewage accumulates in the lower narrowed part of the sump 3. When the sludge reaches a specified level by the signal of the sensor 25, the valve 15 opens and the sludge is discharged into the screw device 16. The degree of filling of the sump with sludge is determined by the signal of the liquid-sludge separation sensor. As a section sensor, for example, a POS 101-362IOM sensor relay is used.

Partially dehydrated waste is transported by means of a screw device 16 to the tank 17. The screw transfer device is a perforated housing and a screw installed on the drive shaft rotating on the drive shaft from the drive with a variable pitch of the blades of its turns decreasing to the unloading device. The auger shaft (not shown in the drawing) is mounted in spring-loaded bearings movable relative to the housing with bearings, which provide a tight clearance-free contact between the outer surface of the auger turns and the perforated bottom of the housing.

The liquid flowing through the holes in the screw housing 16, obtained as a result of processing the sludge, accumulates in the tank 18. When the tank is completely filled with the liquid phase, the pump 19 is turned on by the signal of the sensor 26, for the time required to supply the liquid from the tank 18 through the pipeline 20 to the column pressure flotation 5 for tertiary treatment. The degree of filling of the tank for collecting the liquid phase is determined by the signal of the level sensor. As a level sensor used, for example, a hydrostatic depth probe type SG-25S.

Claims (1)

A device for flotation wastewater treatment, comprising a sump with an internal vertical baffle in the upper part and a tapering lower part, a pressure flotation column installed on the sump, connected to a pressure tank for supplying an air-water mixture, characterized in that it is equipped with an electroflotation sewage treatment column water, with a screw device for sludge dewatering, connected to the sump by an exhaust pipe with a valve controlled by a sensor for separating the liquid phase and sludge in the sump, with a capacity for collecting the liquid phase, a tank for collecting dehydrated sludge, a pump for supplying water for purification to the pressure flotation column, controlled by a sensor for the level of the liquid phase in the tank for collecting the liquid phase, a pump for supplying purified wastewater to the pressure tank.