JPS5845313B2 - Solid-liquid separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for solid-liquid separation of raw solutions such as sewage sludge and industrial wastewater. On the road,
The gas is supplied from the outside in a supersaturated state at a pressure higher than atmospheric pressure, the supplied gas is dissolved in the suspension at the lower part of the circulation flow path, and the dissolved gas is introduced into the upward flow path. The present invention relates to a solid-liquid separator configured to form bubbles and agglomerate solids using the bubbles, and to extract a treated liquid from a relatively deep portion of the upward flow path via a conduit and a rising discharge path.

According to the solid-liquid separator having the above configuration, while supplying gas in a supersaturated state at atmospheric pressure or higher, the gas is once dissolved and then bubbled, so that extremely small diameter particles are formed in the upward flow path. The solids can be efficiently aggregated by generating air bubbles, and the solids and the processing liquid can be effectively separated in a separate ascending discharge path communicating with the circulation flow path. Fluctuations in the amount of bubbles generated in the ascending channel change the level on the top of the circulation channel, and this pressure fluctuation affects the speed of the ascending discharge channel via the conduit, resulting in a decrease in solid-liquid separation performance in the ascending discharge channel. It is being

In view of the above-mentioned circumstances, the present invention provides a solid-liquid separator that has been officially registered, in which a flow path control valve is provided in the conduit, and due to the flow path ripple effect of the control valve, pressure fluctuations are caused to rise and discharge as speed changes. Through extremely simple structural improvements, it has been possible to improve solid-liquid separation performance in the ascending discharge channel.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

The solid-liquid separator includes a device 1 that supplies an undiluted solution such as sewage sludge or industrial wastewater, and an inner cylinder 2 that forms a circulation channel with a large level difference, consisting of a descending channel A and an ascending channel B that supply the undiluted solution. and an outer cylinder 3, and a device 4 for supplying gas in a gas phase to the middle of the downward flow path A without being supersaturated at atmospheric pressure or higher.
and a solid-liquid separation treatment device 5 located at a relatively deep part of the ascending channel B and separate from the circulation channel, for example, 100
In the circulation flow path where there is a large level difference of about m.

In the lower part of the downward flow path A, the gas from the air supply device 4 is once dissolved into the suspension by pressurization, and in the upward flow path B, the dissolved gas is generated as small-diameter bubbles, and the bubbles are It is configured to repeat the cycle of aggregating molecules in the suspension and to separate and recover the solids grown in the separation treatment device 5 and the treatment liquid.

An air supply device 8 with bubble generation nozzles 6 connected to the main pipe 7 is installed in the upper part of the circulation flow path, and air bubbles in the liquid taking up the ascending flow path B are removed from the air supply device 8. The circulation of the liquid is promoted by degassing induced by air bubbles and increasing the specific gravity of the liquid at the inlet side of the downward flow path.

The solid-liquid separation processing device 5 provides an annular ascending discharge passage C on the outer periphery of the ascending passage B, and connects the ascending discharge passage C and a relatively deep portion of the ascending passage B to a downwardly inclined passage. a
and communicate with each other at intervals in the circumferential direction through a conduit 10 having a net-like body 9 at its upper opening, so that the inclined flow path a suppresses the entry of air bubbles, and the ascending flow path B is relatively deep. At point I, the processing liquid is introduced into the ascending discharge passage C in a state where the head change due to bubbles is small, and the solid matter is separated from the processing liquid in this discharge passage C, and the processing liquid is taken out by overflow from here. It is configured to collect the solids from the flow path and to reduce the solids to the downward flow path A by means of a reducing device 11.

The solid matter reducing device 11 has a rake-like scraping device 12°12 extending over the entire radial width of the ascending discharge passage C connected to a plurality of rotating bodies 13.13 rotating around the center of the inner cylinder, and It is composed of a cylinder 14.14 that introduces the scraped solid matter and returns it to the descending flow path A from the downwardly inclined flow path.

In the solid-liquid separator having the above configuration, the conduit 10...
A control valve (■) that controls the flow rate of the processing liquid is provided in the control valve (2), and due to the curving action of this control valve (1), pressure fluctuations due to level changes on the upper surface of the circulation flow are affected as speed changes in the ascending discharge path (C). The structure is designed to prevent this from happening.

The amount of fringing of the control valve (1) is automatically controlled in accordance with level fluctuations on the upper surface of the circulation flow.

That is, a mechanism 15 for detecting level fluctuations on the upper surface electrically using a potentiometer or the like or as a change in static pressure is provided in the outer cylinder 3, and this detection mechanism 15 and the control valve (1) are linked. , an increase in the amount of level fluctuation (i.e., an increase in the amount of variation in the level) is configured to automatically and reversibly increase the amount of smudge, thereby automatically controlling the rate of rise in the ascending discharge path C on a regular basis.

FIG. 2 shows a second embodiment of the solid-liquid separator, in which a part of the ascending flow path B on the upper side of the processing liquid inlet of the conduit 10 equipped with the flow rate control valve (1) is supersaturated at atmospheric pressure or higher. A device 16 for supplying air bubbles is provided to capture small-diameter air bubbles generated on the upstream side of the flow path, and to promote the rise of air bubbles in the subsequent ascending flow path to improve the conduit 10.
..., and suppresses air bubbles from entering into the upper part 4 of the ascending flow path B.
Here, an upwardly inclined plate 17 that forms a zigzag flow path while suppressing flow path resistance is provided to separate and break bubbles from the solid matter, and to A scraping tool 18, 1 that increases the specific gravity of the liquid to promote liquid circulation and rotates along the sloped bottom surface of the rising discharge path C.
8 to the rotating body 13.13 via the rod-shaped body 19.19.
At the same time, the solids scraped into the bottom are collected in the settling tank 20 together with the processing liquid, and the supernatant liquid is supplied to the processing liquid extraction channel, and a part of the precipitated solids is transferred to the descending channel. The conduit 10, which has a descending slope flow path a, is equipped with a flow path control valve V, which automatically controls the amount of fringing. ing.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the solid-liquid separator according to the present invention, with FIG. 1 being a schematic overall longitudinal sectional view and FIG. 2 being a longitudinal sectional view of the second embodiment. 10... Conduit, A... Rising channel, B...
...Downward flow path, C...Upward discharge path.

Claims (1)

[Claims] 1. In a circulation channel with a large level difference consisting of a descending channel A and an ascending channel B that supply the stock solution, the system is configured to supply gas from the outside in a supersaturated state at atmospheric pressure or higher, and the supplied gas is The structure is configured to dissolve the gas in the suspension at the lower part of the circulation flow path, the dissolved gas is bubbled in the upward flow path B, and the solid substance is agglomerated by the bubbles, Conduit 10 from a relatively deep place
. . . A solid-liquid separation device configured to take out a treated liquid through an ascending discharge path C, the solid-liquid separation device characterized in that a flow control valve V is provided in the conduit 10 .