RU2251568C1 - Flotation apparatus for excretion from a suspension of microbial albuminous mass and its concentrating - Google Patents

Abstract

FIELD: agriculture; food industry; municipal economy.

SUBSTANCE: the invention presents floatation apparatus for excretion from suspension of a microbial albuminous mass and its concentrating and is dealt with the field of agriculture, municipal economy and a food-processing industry. The floatation apparatus consists of a container divided by partitions into several communicating chambers and a foam suppressor. The container is supplied with: connecting pipes for feeding the floatable suspensions, for withdrawal of the foam and the clarified suspension; an aerator for feeding air or a gas into suspension fed in the first chamber of the container. The partitions have apertures for overflow of the suspension from one chamber into another chamber and above the bottom of each of them there are diffuser plates for formation of finely dispersed streams of the air or a gas. The aerator is established in the first chamber above diffuser plates. In the last chamber connecting pipe of the clarified suspension a liquid level regulator of the chambers is located. The invention ensures an increased share of the albumen mass in the concentrate and an increased degree of its purification from foreign substances.

EFFECT: the invention ensures an increased share of the albumen mass in the concentrate and an increased degree of its purification from foreign substances.

3 dwg

Description

The invention relates to agriculture and utilities and the food industry.

Known flotation apparatus for isolating from a suspension of microbial protein mass and its concentration, containing a vertically mounted housing, equipped with a nozzle for introducing and spraying the suspension, an ejection aerator, nozzles for removing foam and clarified suspension and an antifoam, consisting of an ejector, a cyclone with a nozzle for removing liquid concentrate and a trap residues of foam with a drainage tube (RU 2077572 C1, 04/20/1997).

A disadvantage of the known apparatus is that it does not dry the foam, which leads to the need to carry out the flotation process repeatedly to achieve the desired protein content in the concentrate.

The closest analogue of the proposed apparatus is an apparatus for isolating a microbial protein mass from a suspension and concentrating it, containing a horizontally located container divided by vertical partitions into a series of interconnected chambers and equipped with nozzles for introducing a floatable suspension, removing foam and clarified suspension, an aerator for introducing air or gas into the suspension supplied to the first chamber of the tank, and defoamers. (SU 258223, 05/08/1970).

Defoamers of the device are located out of capacity. The cameras are interconnected and aerating devices, which are also installed outside the tank.

A disadvantage of the known apparatus is the insufficiently high degree of isolation of the microbial protein mass from various suspensions, as well as the degree of drying of the foam containing the protein and its purification from various impurities.

The technical result of the invention is to increase the protein content in the concentrate and the degree of purification from undesirable impurities.

This result is achieved by the fact that in the proposed flotation apparatus containing a container divided by partitions into a series of communicating chambers and equipped with nozzles for introducing a floatable suspension, removing foam and clarified suspension, an aerator for introducing air or gas into the suspension supplied to the first chamber of the container, and defoamer, the partitions have openings for overflowing the suspension from the chamber to the chamber, and above the bottom of each of them there are filters to form fine flows of air or gas. In the outlet pipe of the clarified suspension from the last chamber there is a liquid level regulator in the chambers.

The invention is illustrated by drawings in which: in Fig.1 schematically shows a flotation apparatus in longitudinal section; figure 2 is a view along aa in figure 1 and figure 3 is a top view of figure 1.

The flotation apparatus for isolating and concentrating the microbial protein mass from the suspension contains a horizontally located container 1, divided by partitions 2 into a series of communicating chambers 3. The partitions have openings 4 for overflowing the suspension from the chamber into the chamber. Above the bottom 5 of each of them there are filters 6 for the formation of fine flows of air or gas. In the first chamber of the vessel above the filters, an annular aerator 7 is installed for introducing air or gas into the suspension supplied to the first chamber of the vessel. The tank is equipped with a nozzle 8 for introducing a floating suspension, connected to a rotameter with a valve 9 for regulating the flow to the ejector 10, a foam nozzle 11 and a clarified suspension nozzle 12, in which the liquid level regulator 13 in the chambers is located. In the upper part of each chamber in the outlet channel there are drainage hoods 14, adjustable in height “H”, for installing foam.

The device is equipped with a defoamer, consisting of an ejector 15, a cyclone 16 and a trap 17 of the remaining foam with a drainage tube 18 connected to the pipe 19 of the discharge of liquid concentrate from cyclone 16, a pump 20 with pipelines on which valves 21 and 22 are installed for supplying air to the tank or gas or inert gas (nitrogen, carbon dioxide) from cylinders 23.

To install the drain peaks at the required height in the wall of the pipe 11, hatches with covers 24 are made.

Capacity 1 has a lid 25 and a clarified suspension receiver 26.

The device operates as follows.

The initial commissioning of the flotation apparatus is carried out when all the chambers 3 of the tank 1 are completely filled with water and when the liquid level regulator 13 is in the lower position. Drain visors 14 of the foam are located approximately at an average height of their position. A saturation agent is selected, which may be air or inert gases, the pump 20 is turned on, or gas cylinders 23, valves 21 or 22 are opened, which allows air or gas to be introduced into the filters 6, the ejector 10 and the defoamer ejector 15. The amount of air or gas is regulated by rotameters. Then, an initial suspension is supplied through the nozzle 8 to the ejector 10, the amount of which is regulated by a rotameter 9 with a valve.

Further, the suspension of air and gas is continued to be introduced into the chamber chambers through open hatches with covers 24, and foam formation is observed in the upper part of the chambers. At the same time, they provide the most effective foam formation in each of the chambers when regulating by rotameters with valves of gas-liquid flows. After the adjustment is made, the apparatus is fixed at the optimum height of “H” for each chamber. The drain peaks are 14 foams and the hatches are closed by covers 24. Using the regulator 13, the optimal liquid level in the chambers is set and complex regulation is carried out taking into account the highest microbial protein yield from the suspension at its lowest humidity.

For each type and concentration of microbial protein in suspension, the performance of the flotation apparatus and operating conditions, an appropriate technological schedule of its work is developed.

When using the proposed flotation apparatus on livestock and poultry farms equipped with biostations for anaerobic digestion of various organic wastes with the production of combustible biogas from them and with the disinfection of wastes from steamed microflora, helminths, their eggs and weed seeds, the microbial protein mass is isolated and concentrated only from an anaerobically fermented suspension, i.e. after its separation by centrifugation, separation, filtration into solid and liquid fractions, the latter of which contains the largest amount of microbial protein mass and salts of heavy metals and plant nutrients dissolved in it.

The suspension isolated from anaerobically fermented organic waste is pumped to the flotation pump, where it is saturated with air or gas in an amount of more than 50% of the volume of the suspension before being introduced into the container 1. The aerated suspension, which escapes under pressure from the annular aerator 7 in the form of a torch, is picked up by a fine stream of air or gas from the filters 6 of the first chamber 3 with the formation of a layer of foam that grows in height and drains when fluid flows out of it, and then flows when the liquid level in the first the chamber into the second chamber, where it is also picked up by a continuous upward fine-dispersed stream of air or gas from the filters 6 of the second chamber with the formation of its own foam layer above it and the overflow of the suspension to be cleaned and through the holes 4 in the partition 2 into the next chamber. The number of chambers in the tank 1 may be two or more, which depends on the required degree of purification of the suspension upon receipt of the greatest amount of microbial protein in the form of a foam concentrate with particles of organic matter and light mineral inclusions.

The sequential flow from the chamber into the chamber of the floatable suspension with the removal of foam from them provides a more complete release of the microbial protein mass from the suspension. The clarified suspension removed from the last chamber contains heavy metals and plant nutrients.

Setting the liquid level in the chambers 3 with the regulator 13 when it is rotated within “U” and installing the drain peaks 14 from the chambers through hatches with covers 24 at a height within “H” and allows changing the thickness of the foam layer in the chambers from zero to “U” + “N”, thereby providing the possibility of the most complete drying of the foam directly at the top in the chambers until it is removed from the chambers and suctioned into the pipe 11 of the foam outlet.

The foam discharged from the chambers under vacuum into the ejector 15 is directed under pressure from the ejector 15 to the cyclone 16, where the foam is extinguished. Air or gas with the rest of the foam is supplied to the trap 17. The rest of the foam in the trap 17 is quenched and the liquid is sent through the drain pipe 18 to the concentrate outlet pipe 19 leaving the cyclone 16.

The paste-like microbial protein mass produced from anaerobically fermented organic waste is a high-value protein-vitamin supplement to animal and poultry feeds. The suspension clarified from anaerobically fermented organics is used for watering and fertilizing plants.

Isolation of microbial protein mass and its concentration from other protein-containing suspensions / bard, excess activated sludge from sewage treatment plants and other similar suspensions / is carried out in a flotation apparatus in the same way as when using it for anaerobically fermented organics.

The proposed design of the flotation apparatus provides a high content of microbial protein mass in the concentrate and its high degree of purification from undesirable impurities.

Claims (1)

A flotation apparatus for isolating and concentrating microbial protein mass from a suspension, containing a container divided by partitions into a series of interconnected chambers and equipped with nozzles for introducing a floatable suspension, removing foam and clarified suspension, an aerator for introducing air or gas into the suspension fed into the first chamber of the container and an antifoam agent, characterized in that the partitions have openings for overflowing the suspension from the chamber to the chamber, and above the bottom of each of them there are filters to form finely divided particles. air or gas currents, said aerator is mounted in the first chamber above filtrosami, wherein in the pipe of clarified slurry from the last chamber is a liquid level control in the cells.

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