KR100293244B1 - Device for separation of solids, liquid and gases from sewage and wastewater - Google Patents

Abstract

PURPOSE: Suspended solids in wastewater is not likely to be settled because not only it has low specific density compared with water, but also fine air bubbles are attached on the slime layer formed on the outer surface of the suspended solids. Therefore, removal of the fine air bubbles from suspended solids in wastewater would be helpful to increase settling rate. The purpose of the present invention is to remove air bubbles off suspended solids by atomizing wastewater. CONSTITUTION: Excess sludge from wastewater treatment plant employing activated sludge system is poured into a reservoir(1). Total solids(TS) of the excess sludge is 6,000mg/L, and volatile solids fraction is 4,000mg/L. A spraying device(2) ejects compressed air at the pressure of 5 bar through a nozzle(22) to inject excess sludge. The sludge is sprayed being atomized into a separation tank(3). After sprayed from the nozzle, sprayed wastewater drops collide with a collision plate(5) and then piled up in the rear part of an inclined plate(4). Collected sludge is drained through a sludge drainage port(32) and gases are captured in a gas collector(6).

Description

Device for separation of solids, liquid and gases from sewage and wastewater

The present invention relates to a device that allows the separation of solids, liquids, and gases from all wastewater, including solids or solids such as sludge, to allow the collection of each.

Wastewater treatment is an operation to remove contaminants in water. However, one of the most important technologies in wastewater treatment is the separation of solids, liquids, and gases mixed in sewage and wastewater. Sewage and wastewater separated into solids, liquids and gases can simplify the main process of reducing the concentration of contaminants, as well as the possibility of recycling alone. Although it is difficult to strictly define water pollutants, it generally refers to the inclusion of dirty melts and solids suspended in water. The treatment of such wastewater can be generally divided into three types: physical treatment such as precipitation, filtration, flotation, screen, etc., chemical treatment such as flocculation, redox, ion exchange, adsorption, neutralization, and activated sludge method. And biological treatments such as biofilm method and oxidation paper method. Since this treatment is ultimately a technique for reducing the concentration of contaminants, the technique of separating solids, liquids and gases in the water treatment process can simplify all wastewater treatment processes. In particular, depending on the waste water, as described above, the separation process of the solid, liquid, and gas may be a complete treatment process.

Until now, three-phase separation technology for separating solids, liquids, and gases has not been developed as a technique for treating wastewater, but technology for two-phase separation methods such as gas or solids separation has been frequently performed. . However, these methods require expensive raw materials and auxiliary facilities, do not remove gases or odors to the extent desired, or even cause unexpected side effects. As a technique for separating solids such as solids and sludges from the wastewater, among the techniques for separating solids, liquids, and gases, a means for precipitating solids contained in the wastewater has been generally known. However, the sedimentation of such wastewater has a long time for the administration and precipitation of the sediment to increase the sedimentation effect and the vast facilities.

The present invention is to provide a device for separating the solids from the waste water and in the separation process also the gas mixed in the waste water together.

The inventors have conducted a long study and found that the solids mixed in the waste water are not easily precipitated because such solids generally have a low specific gravity, and the solids have microorganisms attached thereto when they are organic materials. In the slime layer of some microorganisms of the attached microorganisms, fine air bubbles may be attached, and these air bubbles are inhibited from the solids by the surrounding water, thereby reducing the specific gravity of the solids. It has been found that air bubbles take a long time to dissolve in water and thus solids to settle. Therefore, the present inventors thought that by separating the fine air bubbles attached to the organic or inorganic solids to increase the specific gravity of the solids to promote precipitation, such separation of the air bubbles as a preliminary problem to remove the liquid surrounding the solids It was thought that the liquid removal from the solid surroundings was sought.

Through this thinking process, the present inventors found that the removal of liquid from the surroundings of solids and the removal of gases can be removed by atomizing the liquid around the solids by spraying sewage and waste water. It was found that it was removed from the solids. Thus, the present invention is characterized in that after separating the water and the gas from the solid by spraying the waste water and atomization, the separated gas, the water and the solid can be separately collected. Referring to the configuration of the present invention in detail as follows.

1 is a cross-sectional view of main parts of an embodiment of the device of the present invention.

The present invention is to separate the water and gas from the solid by spraying and hatching the waste water, the separated gas can be collected by a separate collector, and the solid and atomized fine water droplets separated from the water and gas, respectively It is characterized by collecting separately.

The wastewater discharged from the spray apparatus of the present invention is atomized, and in this atomization state, that is, in the form of droplets, the water surrounding the solid is atomized, so that water and the solid are separated. In addition, during the atomization process, as the water having a function of protecting the outside of the gas present in some of the microbial cell slime layers is removed, the above-mentioned gas is released to increase the specific gravity of the solid. Although the solids are mixed with water, the solids are easily precipitated to the bottom of the water to facilitate separation from the water. Compressed air or waste water sprayed for spraying may be heated and ejected to obtain a synergistic effect of separation due to vaporization of water.

As such, the method of separating solids, liquids, and gases by spraying can be applied to the treatment of all sewage and wastewater including solids. Various choices can be made.

In order to separate solids, liquids, and gases in this way, a spray device installed in a wastewater storage tank and a wastewater storage tank is a basic element, and solids collecting means separated by atomization, a liquid collecting means, and a gas collector are combined. It is preferable to make it.

It is a matter of course that the spray device can be used without limitation, the general device that can atomize the waste water. However, as a spraying device, it is preferable to use a spraying device in which a compressed air jetting nozzle is provided at the outlet of sewage or wastewater, and in this case, the air pressure of the compressed air jetted through the compressed air jetting nozzle is preferably 1 bar or more. Do.

Since the waste water sprayed by the spraying device is jetted while being atomized, the atomized liquid is liquid. Therefore, when the liquid mixed with the solid is atomized and removed from the solid, it is surrounded by the liquid and the removal is restricted. The gas present in the cell slime layer is stripped off. In this way, the solids from which the liquid has been removed are scattered to a distance from the spray apparatus. Thus, solids scattered to a far distance can be collected by solids collecting means installed relatively far from the spraying device. The larger the ejection pressure of the spray device, the greater the atomization of the liquid contained in the solids, and thus the greater the separation effect of water and solids, and the greater the difference between the scattering distance of the atomized air bubbles and the scattering distance of the solids. It can be done easily.

In order to illustrate the invention in detail, laboratory-scale examples are presented for realizing the method of the invention. However, the following examples should not be understood as limiting the scope of the present invention.

That is, in the accompanying drawings, for convenience of explanation of the present invention, the embodiment used in the experiment of the present invention is shown. According to this, a spray device 2 is installed at the bottom of the storage tank 1, and the spray device 2 is a compressed air spray nozzle 22 coupled to the jet port 21 having a diameter of 6 mm, as shown in the accompanying drawings. As described above, it is common to be coupled to the inside of the jet port 21, and the number can be made up of one or more of course. In addition, the compressed air jet nozzle 22 coupled to the jet port 21 may be configured to be coupled to surround the outer peripheral surface of the jet port 21.

The solids collecting device and the liquid collecting device coupled to the outlet of the spraying device 2 include a separating collection tank 3, a slanting plate 4 installed at the bottom of the separating collection tank 3, a collecting plate 5 and a liquid discharge port. (31) and the solid discharge port (32). The gas collector 6 is provided in the upper part of the separation collection tank 3. The distance from the tip of the spraying apparatus 2 to the booker collecting plate 5 is 700 mm.

An embodiment in which the present invention is implemented using the apparatus, which is an embodiment of the present invention configured as described above, is as follows.

Secondary sludge (surplus sludge) generated in an activated sludge sewage treatment plant was introduced into the storage tank 1. Secondary sludge added to the storage tank 1 had a total solids of 6,000 mg / L, and volatile solids of 4,000 mg / L. The secondary sludge of the storage tank 1 was ejected by injecting compressed air at a pressure of 5 bar through the compressed air spray nozzle 22 of the spraying apparatus 2. The sludge ejected was scattered while being atomized (atomized), and the fine water droplets fell quietly into the separation tank 3 at a distance of approximately 100 to 500 mm from the jet port 21, and the solids lightly collided with the collecting plate 5. After slowly sliding down, it gradually accumulated on the back of the inclined plate 4. The liquid was discharged to the upper liquid discharge port 31 of the separation collection tank 3 by the continuous jet, and the solids were discharged to the solid discharge port 32 on the lower side. Gas was collected by the gas collector 6.

According to this embodiment, the result of comparing the total amount of solids, the amount of volatile solids, and the amount of carbon dioxide gas discharged from the solid discharged to the solid discharge port 32 and the secondary sludge before spraying were as follows.

As can be seen from the results in Table 1, the present invention makes it possible to separate solids, liquids, and gases extremely easily by spraying waste and wastewater. In the laboratory embodiment, the falling solids are mixed again with the liquid, but the atomized fine water droplets and the solids fall as described above when sprayed by a large-scale facility, that is, a high-pressure jet, which is not the above laboratory-scale embodiment. It is expected that the separation of solids and liquids will be further enhanced because the positional difference will be greater, and the separation of solids from sewage and wastewater can be performed very easily. Therefore, the apparatus of the present invention is expected to be usefully used as a pretreatment apparatus for degassing wastewater and concentrating solids.

Claims (1)

In the storage tank 1 of wastewater and waste water, the spraying apparatus 2 couple | bonded with the storage tank 1, the solids collector and the liquid collection apparatus couple | bonded with the exit side of the spraying apparatus 2, the spraying apparatus 2 ) Is composed of a spout 21 connected to the reservoir 1 and a compressed air jet nozzle 22 coupled to the spout 21, the solids collecting device and the liquid collecting device coupled to the outlet of the spraying device 2 is separated And a collection plate (3), an inclined plate (4) and a collecting plate (5) and a liquid discharge port (31) and a solid discharge port (32) installed at the bottom of the separate collection tank (3).