DE19547182A1 - Liquid e.g. water clarification vessel - Google Patents

Abstract

A liquid treatment apparatus consists of a clarification vessel (1) which has (a) an open-bottom filter (3) located in front of the vessel overflow (5) and supplied with liquid below the water level of the vessel (1); (b) open-ended tubes (4) assembled below the filter material (6) in the filter body (3) and communicating, at the bottom, with the collection tank (2) of the vessel (1) and, at the top, with the filter material (6); and (c) an outlet communicating, above the filter material (6), with the vessel overflow (5) and downstream collection devices. Also claimed is a similar apparatus having (a') an open-bottom filter positioned over the entire clarification vessel surface and communicating, via open-ended tubes assembled below the filter material in the filter body, with the collection tank which has an inlet for the liquid, the liquid level lying above the surface of the filter body; (b') one or more channels which are closed in the direction of the collection tank and which communicate with a clarified and filtered liquid discharge channel located in the bottom of the filter body, the channels passing upwards through the filter material.

Description

The invention relates to a device for the clarification of liquids with therein contained solids, in which a clarification is followed by a filtration. she finds Application in the field of water management, especially for flocculation filtration, however also in the commercial and industrial sector, such as B. the paper and textile industries as well as in the treatment of waste products in the municipal area.

To separate the solids contained in liquids for cleaning purposes filter and thus separate various filters such as membrane, candle, drum or Gravel filter known. The use of these filters requires a footprint with a housing for the filters and inflow lines with sometimes high pumping capacities for the effective Filter throughput. The inevitable due to these pumping powers to those in the liquid Forces contained in unstable flakes destroy the flakes and cause filtering only with a high level of technical effort and in some cases still insufficient is possible.

The invention is therefore based on the object of effective and adequate filtration with low energy consumption without additional turbulence and without a separate footprint as well as without filter housing.

This object is achieved in that in an existing clarifier a filter open at the bottom in front of the clarifier overflow with a liquid supply  is arranged below the water level of the clarifier, in the filter body below of the filter material are arranged on both sides open tubes arranged after below with the collecting basin of the clarifier and upwards with the filter material in Are connected and that the drain above the filter material in connection with the Overflow of the clarifier and suitable collection facilities arranged behind it.

For smaller clarifiers, the object of the invention is achieved in that a bottom open filter is arranged over the entire surface of the clarifier and above in the filter body arranged below the filter material, combined open on both sides Tube with an inlet for the liquid whose liquid level is above the Surface of the filter body lies, provided collecting basin of the clarifier in connection stands and that in the filter body one or more downwards in the direction of Collection basins of the clarifier are arranged closed channels, which with a in lower area of the filter body arranged drain channel for the clarified and filtered Stand in liquid and are led up through the filter material.

The invention will be explained in more detail below using exemplary embodiments. Show here

Fig. 1 apparatus according to the invention the cut through which is arranged in an existing round settling tank,

Fig. 2 shows the section through a small clarifier with the device according to the invention.

According to the first exemplary embodiment according to FIG. 1, in the clarifier 1 , which has a catch basin 2 on the bottom, there is a filter body 3 with tubes 4 open on both sides, which is arranged in front of the clarifier overflow 5 . The tubes 3 are connected to the collecting basin 2 at the bottom and to the filter material 6 at the top. The drain above the filter material 6 is connected to the clarifier overflow 5 and this with a collecting channel 7 arranged on the clarifier 1 . A support grid 8 is arranged on the filter material 6 .

The wastewater clarifies in the clarifier 1 by the solids contained therein settling in the settling tank 2 of the clarifier 1 , and inevitably flows through the higher water level of the clarifier 1 through the filter body 3 and the tubes 4 arranged therein due to the level difference and the effect of the capillary forces in the filter material 6 , which is secured by the support grid 8 against blowing. After overcoming the corresponding filter resistance, the filtrate collects above the filter material 6 and flows via the clarifier overflow 5 into the collecting channel 7 .

The small clarifier 1 according to the second exemplary embodiment has a filter which is open at the bottom and which is arranged in its filter body 3 below the filter material 6 and is combined with tubes 4 which are open on both sides and have an inlet for the liquid, the water column of which lies above the level of the filter body surface. having collecting basin 2 of the clarifier 1 is connected and which is arranged over the entire surface of the clarifier 1 . The filter body 3 closes off at the top filter material 6 with a support grid 8 lying above it, which covers the entire surface of the filter body 3 . In the filter body 3 , downwardly closed channels 9 are also arranged parallel to the tubes 4 . The channels 9 are connected to a drain channel 10 arranged in the lower region of the filter body 3 and are guided upwards through the filter material 6 , over which they end.

The discharged wastewater is clarified in the clarifier 1 by the solids contained therein settling in the settling tank 2 of the clarifier 1 , and inevitably flows through the outer higher water level through the filter body 3 and the tubes 4 arranged therein due to the level difference and the effect of the capillary forces the filter material 6 , which is secured by the support grid 8 against blowing up. After overcoming the corresponding filter resistance, the filtrate collects above the filter material 6 and reaches the channel 10 via the channels 9 and the given gradient.

This is an appropriate cleaning without additional energy for the Convey and filter the liquid and without additional, the clarification and filtering through Destruction of the unstable flakes contained in the liquid and obstructing turbulence achieved.  

By lowering the water level in the clarifier 1 and spraying the surface of the filter body 3 from above, the filter material 6 can be cleaned, the residues being rinsed into the settling tank 2 of the clarifier 1 .

The desired filter resistance is higher by designing the outer Water level achieved.

To prevent the effects of turbulence in the clarifier 1 on the filtration, the required calming zone can be created by changing the length of the tubes 4 .

An advantageous design is ultimately the optimization of the filter surface as a function of the filter performance by changing the proportion of the tubes 4 in relation to the grooves 9 in the filter body 3 in the case of small clarification tanks or by changing the size of the filter body surface in the case of large clarification tanks.

Reference list

1 clarifier
2 catch basins
3 filter bodies
4 tubes
5 clarifier overflow
6 filter material
7 collecting channel
8 support grids
9 gutter
10 channel

Claims (3)

1. Device for the treatment of liquids, consisting of a clarifier with inlet and outlet and a catch basin in its bottom area and a filter body arranged in the clarifier, characterized in that a filter open at the bottom in front of the clarifier overflow ( 5 ) with a liquid supply below the Water level of the clarification tank ( 1 ) is arranged that in the filter body ( 3 ) below the filter material ( 6 ) summarized on both sides open tubes ( 4 ) are arranged, the down with the catch basin ( 2 ) of the clarification tank ( 1 ) and up with are connected to the filter material ( 6 ) and that the outlet above the filter material ( 6 ) is connected to the clarifier overflow ( 5 ) and suitable collecting devices arranged behind it. 2. Device for the treatment of liquids, consisting of a clarifier with inlet and outlet and a catch basin in its bottom area and a filter body arranged in the clarifier, characterized in that a filter open at the bottom is arranged over the entire surface of the clarifier ( 1 ) and via in its filter body ( 3 ) arranged below the filter material ( 6 ), combined tubes ( 4 ) open on both sides with the collecting basin ( 2 ) of the clarification tank having an inlet for the liquid, the liquid level of which lies above the surface of the filter body ( 1 ) ( 1 ) is connected and that in the filter body ( 3 ) one or more downwardly closed in the direction of the collecting basin ( 2 ) of the clarification tank ( 1 ) channels ( 9 ) are arranged, which with a in the lower region of the filter body ( 3 ) arranged drain channel ( 10 ) for the clarified and filtered liquid in Ver stand binding and are led up through the filter material ( 6 ). 3. Device for the treatment of liquids according to claim 1 or 2, characterized in that the filter material ( 6 ) is secured by a support grid ( 8 ) arranged above it against floating in the liquid.