JPS5836693A - Solid matter separator for waste water purifying facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solids separator for separating small solids or suspended solids from wastewater to be purified, in particular in closed filter installations.

Complete and rapid purification of wastewater is of great importance since industrial wastewater cannot be discharged directly into natural rivers, which would cause irreversible damage to the overall water quality management. That's true.

Various proposals have been made for removing dirt in wastewater, especially taking into account the different degrees of contamination of industrial wastewater. In particular, toxic organic substances, which are extremely difficult to separate, must also be removed.

In closed filter installations with a number of combination furnaces for combining wastewater with finely divided air or exhaust air and a decomposition furnace with various filter materials, some pretreatment (preliminary A method and apparatus for purifying waste water that can obtain a large decontamination value after neutralization (neutralization) are described in Japanese Patent Application Laid-Open No. 54-90859.

The process then involves chemical or physicochemical reactions (neutralization,
catalytic oxidation, adsorption, etc.).

Such equipment works absolutely reliably when the supplied water to be purified has been completely mechanically removed from all solids and suspended matter, as has been verified experimentally. This is because only then is it possible to obtain the desired flow rate of the water to be purified through the closed filter installation without interference and without the influence of the respective filter material.

This means that in many applications, for example in the textile industry, it is necessary to carry out mechanical purification of the wastewater to be supplied in advance to ensure that fine suspended matter such as textile waste is separated.

Separators used for this purpose are already known, but no separator has been found that can meet the high demands regarding reliability and residual load required for the continuous passage of large volumes of waste water.

It is therefore an object of the present invention to provide a solids separator which is capable of sufficiently filtering all solids and suspended matter from wastewater to be purified, e.g. from dyeing factories. It has no rotating parts so that only a small amount of energy is consumed, and the ratio between the operating time and the down time required for self-cleaning is determined to be suitable.One separator guarantees continuous wastewater purification operation. The purpose is to do so.

This object is achieved according to the invention by a separator with the features of patent claim 1.

In the solids separator according to the invention for separating small solids or suspended solids, at least two cylindrical filters are provided, taking into account the subsequent waste water purification step and providing additional filtration. For this purpose, the intermediate between at least two filters is filled with granular material. According to an advantageous embodiment of the invention, this granular material with a particle size adapted to the sieve holes formed in the cylindrical filter can be used for auxiliary mechanical purification, neutralization, catalytic oxidation or biochemical purification. used. Based on the proposal of the invention, the wastewater, which is still contaminated with solids or suspended matter, is then fed into the outermost warm space between the casing and the cylindrical filter, while these substances are removed and the next step is carried out. The waste water to be fed to a subsequent filter device for purification is discharged from the internal chamber of the innermost filter of the entire filter arrangement. ′
An auxiliary effect of the material contained in the inner chamber between the concentric cylindrical filters is that in the solids separator which has the characteristics according to the invention and which is employed in installations such as those described above, the waste water is already exposed to air or air. This is due to the fact that the exhaust air from the downstream stage of the filter installation is heavily mixed, so that the above-mentioned reactions also take place in the separator itself.

In the case of the solids separator according to the invention, the cross-sectional area of the sieve holes in at least the outermost cylindrical filter varies from bottom to top, with the bottom hole having the smallest cross-section. - approximately 5 to 50% of the cross-sectional area of the hole whose upper end hole is in the lower range;
It is particularly advantageous if K has a cross-sectional area ten times larger. In this case to separate the fiber waste! The sieve hole at the bottom end is 0.2fi and the hole at the top end is S-
for best results. In this case, of course, the grading of the sieve hole diameter depends to some extent on the actual size of the solids or suspended matter to be separated.

In order to pass through the ultrafiltration, according to another advantageous embodiment of the invention, the sieve holes of the innermost cylindrical filter are covered with a fibrous gauze, e.g. , thereby achieving a particularly high degree of purification in this area.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The solid separator of the present invention will be described in detail below based on embodiments shown in the drawings.

In the drawings, the symbol l is the outer wall of the cylindrical casing,
A separator according to the invention is housed therein. The waste water to be purified of solids and suspended solids is fed into the casing via the feed pipe 2 at approximately one third of its total height. The wastewater from which solids have been removed is led from the bottom through the discharge pipe 3 to another purification device.

According to the invention, two cylindrical filters 4 and 5 are provided inside the casing, which are arranged concentrically with respect to each other.1. The filter screen or cylindrical screen then forms an annular space relative to the housing 1, as is clearly shown in FIG. A second cylindrical filter 5 is located concentrically on the inside and its inner diameter is such that it can accommodate the necessary components for backwashing, i.e. cleaning the filter. As shown in the figure, the waste water that has passed through the filter device is discharged downward from the internal chamber of the inner filter 5.

The filter 4 has a large number of sieve holes, the cross-sectional area of these holes in the lower region of the filter 4 being much smaller than that in the upper region of the filter 4.

This cross-sectional area ratio is preferably about 1:5 to 1:10. Thus, for example, for installations for purifying waste water contaminated with fibers, the pore size is determined to be 0.2 al in the lower region of the casing 4 and 1.51 al in the upper region. For ultrafiltration filters, the lower third of the inner cylindrical filter 5 is then provided with a fiber gauze 51, which is shown only in broken lines in FIG. For example, a sieve hole with a cross-sectional area of 0.2 mm, which is present in this area, is covered, so that only water absolutely free of solids is allowed to pass through.

Two concentric cylindrical filters 4 and 5 according to the invention
In the annular space between them, granular materials are accommodated, in particular in the illustrated embodiment a total of three materials A, B,
(3), which are optionally separated from each other by intermediate layers. In a specific example, material A consists of blue limestone with a grain size of 2U, on top of which blast furnace slag with a grain size of 2U, and On top of that, hydrated carbon (Hydrak-Ohlθ) with a particle size of 3 fl is inserted.

If the desired purification rate is very high, the sieve holes become clogged after some operating time, so a backflow cleaning device is provided for the entire filter device.

This cleaning device primarily consists of a nozzle rod 6 located inside the inner cylindrical filter 5, which nozzle rod 6 is oriented in all directions and through which hot or cold cleaning water is supplied. Furthermore, hot steam is injected into the filter holes from the inside.

Furthermore, a total of six nozzle rods each having a semicircular cross section are provided in the annular space between the cylindrical filters 4 and 5. Four of these nozzle rods are 7°8, . Only 9.10 is shown in the figure and has a nozzle directed towards the outer cylindrical filter 4.

All nozzles or their supply lines lead in common to a source of cleaning water or cleaning steam via a piping system 11 arranged on the upper side of the housing l.

A discharge pipe 13 is provided at the lowest end of the casing l in order to discharge solid matter or floating matter that falls in the outer space between the casing 1 and the outer filter 4 during cleaning. .

A discharge pipe 12 located under the casing immediately outside the inner filter 5 directs foreign matter falling from the inner filter 5 and especially foreign matter removed by the gauze 51 downward to a piping system or a collecting tank (not shown). Used for evacuation. In this case, the discharge pipes 12 and 13 are provided with sliding stop valves 14, which are shown schematically.

During the cleaning process, the waste water discharge pipe 3 from which foreign substances have been removed is closed.

The piping systems 11, 12, 18 are enclosed as indicated by casings 15 and 16, respectively.

Although the invention has been described in terms of its main structural features on the basis of highly schematic embodiments, it will be obvious that a number of modifications and changes will occur to those skilled in the art. In particular, it is also possible to arrange three or more filters concentrically, in which case the specific loading type is to prevent the generation of filtration pressure in the outermost annular space when the filter holes are rapidly blocked. In addition, it is recommended to provide an overflow port in the cylindrical filter on the outside of the shrimp.

For a given type of wastewater, the various materials in the annular space between each filter are similarly concentrically arranged in order to pass through material C as well as materials A and B the wastewater that is very finely filtered in the lower region. It is recommended that they be distributed over the entire height.

In contrast, in the embodiment described above, the material layers are arranged one above the other, which is particularly easy to realize in terms of construction, and in practice nevertheless Since the water to be purified moves not only horizontally but also vertically due to the removal of each filter, the desired pretreatment is guaranteed.

In order to make the drawing easier to understand, a slide type stop valve 140 is shown.
The switching connections between the two, the slide valve in the discharge pipe 3, the control of the supply of wash water, the check valve in the supply pipe 2, etc. are omitted. These treatments are well known to those skilled in the art and can be easily implemented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a solids separator according to the present invention;
The figure is a sectional view taken along the line t+-n in FIG. 1. l...Casing, 2...Wastewater supply pipe, 3...Wastewater discharge pipe, 4.5...Cylindrical filter, 6...Cleaning nozzle rod, 7. 8. 9. 10...Cleaning nozzle rod, 11...Cleaning water supply pipe, 12.13...
Discharge pipe, 14...Slide type stop valve, 51...Fibre gauze.

Claims (1)

[Scope of Claims] l) In a solids separator for separating small solids or suspended solids from waste water to be purified, in particular in closed filter installations, in a cylindrical casing (1) concentrically arranged at least two cylindrical filters (4, '5) arranged vertically and having sieve holes on their entire circumferential surface;
In the space between the two cylindrical filters (4, 5), granular material (A, B, C) is applied over almost the entire height of the filter for auxiliary mechanical purification, neutralization, catalytic oxidation or biochemical purification.
) is filled, a wastewater supply pipe (2) is introduced into the annular space outside the outermost cylindrical filter (4), and a wastewater discharge pipe (3) is led out from the inner chamber of the innermost cylindrical filter (5). A solid separator for wastewater purification equipment, which is characterized by: 2) At least the sieve holes of the outer cylindrical filter (4) are...
5 to IO in stages from the bottom to the top depending on the case
Solids separator according to claim 1, characterized in that it has a cross-sectional area that is doubled. 3) The lower region, in particular the third region, of the innermost cylindrical filter (5) is surrounded by a fiber gauze (51), for example a microstructured gauze cloth. Solids separator according to item 1. 4) The space between the filters is layered with various substances (A, B, 'O) with particle sizes that match the cross-sectional area of the adjacent sieve holes (particle size 2 to 5 times the cross-sectional area of the sieve holes). The solids separator according to any one of claims 1 to 3, characterized in that it is filled. 5) In the space between the filters, blue limestone with a grain size of about 1-2U is placed as the lowest layer (A) up to one-third of the total height of the casing, and blast furnace slag with a grain size of 1-2U is placed on top of it as a second layer. Solids separator according to claim 4, characterized in that the layers are provided with a layer of hydrated carbon having a particle size of about 8111 as the top layer. 6) Claims 1 to 6, characterized in that the waste water supply pipe (2) is provided on the side of the casing (1) at a height of about one-third of the total height of the casing (1). The solids separator according to any one of Item 5. 7) A cleaning nozzle device with an outlet nozzle is provided inside each cylindrical filter, and a closable discharge opening (12
, 13) is provided, the solid matter separator according to any one of claims 1 to 6. 8) The solids separator according to claim 7, characterized in that a nozzle rod (6) formed in the shape of an annular nozzle is arranged concentrically with the innermost filter (5). 9) In the annular space between the two cylindrical filters (4, 5),
Unidirectionally acting cleaning nozzle rods (7, 8, 9) with nozzles directed outwards against the outer cylindrical filter
, 10), the solid matter separator according to claim 7. 10) For the nozzle rods (6, 7, 8, 9, 10) to commonly supply hot or cold cleaning water or steam from the upper side of the casing. A solid separator according to any one of claims 7 to 9, characterized in that the separators are connected to each other via a piping system.