KR19980033140A - Plant for sewage sludge treatment - Google Patents

Abstract

Trees grow on the filtration layer and thereby extend above the height S at which the sludge in the basin is filled from the filtration layer 4 around the opening 10 of the filtration drainage and around the opening 10 of the filtration drainage. Facilities for the treatment of sewage sludge and similar sediments characterized by at least one basin with such a waterproof bed, the shaft 8 being arranged and a leak conduit leading to the shaft being provided to the filter bed.

Description

Plant for sewage sludge treatment

The present invention relates to a plant for the treatment / drainage of sewage sludge and similar sediments according to the general claim of claim 1.

Such a facility is known from DE 43 30 422 C1. This sewage sludge is filtered through a filtration layer and then discharged. Residual sludge deposits are gradually treated through the reeds that develop on the filter bed. Reeds have intersecting nodes, horizontal and vertical branches and roots formed above them. This causes these reeds to grow further in that location as the amount of sludge deposit increases. Thus over the coming years they provide a suitable living space for microorganisms and small organic organisms. That is, these reeds provide oxygen to the microorganisms and protect them from harmful effects. Thus, an environment rich in oxygen-rich mixed deposits appears at the top of the filter bed, which leads to the treatment of sludge deposits.

In accordance with the invention a shaft tower is thus built around each outlet on the bottom of the vessel, at least up to the full level of sludge being dewatered from the vessel.

Trees on the filter bed tend to grow their roots in the cavities, especially at the outlet. Eventually uncontrollable filtration drainage of the mentioned plant can contribute to the cultivation (of trees) on drain conduits.

Reeds that develop in the openings of the outlets according to the invention are now easily accessible by the shaft; This means that the reeds can be blocked from above and thus the outlets remain free. Preferably no filter bed is present in the shaft in the outlet region so that the outlets can be better connected.

This axis may be arranged at the edge of the container; For example, a structure can protrude into the vessel around the vessel—similar to a pond spindle.

On the other hand, if the shafts are arranged intermediate from the periphery of the vessel, this generally forms a tower in the vessel.

This shaft may be made of concrete, steel, plastic or other materials. It may have a rectangular, curved or other shape. If the shaft is shaped like a tower, for example it can be credited through several successive stacked concrete ring parts.

This shaft tower-or if several outlets are available in the vessel-these shaft towers-can form pillars or pillars for maintaining the passage from which control and maintenance of the installation is carried out-in particular above the shafts. Washing of the outlets is performed. The shaft tower can also form a support for the sludge feed conduits in the vessel.

Each shaft tower-especially at the bottom of the shaft wall-represents an outward base, which is arranged on the filter bed; This means that it is intermediate from the waterproof bed of the container. For example, this base may be a plate suspended in or on the filtration layer.

Sludge inflow preferably takes place in the shaft towers. The sludge inlet conduits are thus directed towards the foundation along the bottom of the shaft tower. This prevents the filter bed from being replaced by sludge flowing in from the sludge inlet point.

This filtration layer is simultaneously coupled with external air through the shaft. This circulates the air to the filter bed and, together with the air, to the sludge precipitate from the bottom. The gaseous deposits of microorganisms are therefore neutralized and the decay of sludge into the soil is accelerated. In addition, a leaky conduit may be provided that extends from the outlet to the filter bed for additional air flow in the filter bed. This leak conduit can be formed, for example, through a perforated plastic pipe.

Each leak conduit—preferably at the opposite end of the outlet—shows an extension, which extends from the filtration layer into the vessel beyond the full level of sludge. For example, this extension may be arranged along the periphery of the container. At the sludge ridge end, this extension is open and thus air can flow inside. In contrast to the leaky conduit in the filtration layer, this extension is open so that no sludge can enter the leaky conduit.

Next, the present invention will be described in more detail by explaining as an example.

Such facilities often operate over decades. Nevertheless, it has been shown that over time, the filtration drainage cannot always be controlled.

It is therefore an object of the present invention to ensure a complete function in the filtration of these installations over the years. This can be achieved by a suitable installation of the invention as characterized in claim 1. Advantageous designs in suitable equipment of the invention are cited in the dependent claims.

1 shows, in cross section, a portion of a branch in a suitable installation of the invention with independent parts,

2 shows an enlarged cross section of the shaft tower in the basin according to FIG. 1;

The branch on the wide bed 1 is represented by the waterproof membrane 2; A thin layer of sand for the protection of the membrane 2 (not shown) can also be provided between the bed 1 and the membrane 2. The membrane 2 extends from the bed 1 on the inclined inner wall 3 to the upper edge of the branch. The filtration layer 4 is located at the top of the waterproof membrane 2. This filter layer may consist of any particulate insoluble material, for example gravel, sand or similar stone. This filtration layer 4 is planted with reeds 5 and covered with a sludge settling layer 6.

A shaft tower is placed in the basin, the foundation 7 of which is arranged as a flat plate and tightly coupled with the upper filtration layer 4. The shaft wall 9 extends vertically above the reeds 5 and above the maximum sludge filling level S of the plant-this means up to the height of the edge of the basin. This foundation 7 lies on the filtration layer 4 intermediate from the waterproof membrane 2.

A filtration outlet 10 is provided in the shaft on the basin bed, which means a branched drain conduit 11 which is connected to the main drain and extends across the width of the basin at the bottom of the membrane 2 in the bed. A funnel-shaped zone (in the absence of the filtration layer 13) extending from the top of the layer 4 to the interior of the shaft is provided in the region of the outlet 10. It can be filtered into the drainage channels 11, 12 below the foundation 7 in the direction of the arrow 14.

The shaft tower 8 simultaneously forms pillars to maintain the passage 16 as well as the inflow of sludge. Typically several such towers 8 are arranged in series, whereby the retaining passage 16 crosses the branches in the cross direction. The inflow of the sludge consists of two main inlet conduits 17 on both sides of the holding passage as well as inlet columns 18, which extend vertically downward from the main inlet conduits 17 and form a foundation ( To 7).

The leaky conduit 20 in the filtration layer extends from the region 13 removed from the shaft 8 and represents the elongation 21, which is the height filled with reeds S from the filtration layer 4 on the branch bed. Stretches up S The elongate portion 21 is waterproof and its upper end is open.

Appropriate installations of the invention are designed for the first time treatment, which means for the drainage and treatment of public and industrial sewage sludge. Among them is an important advantage of the proper installation of this invention-this does not require any additional energy for sewage sludge treatment.

Any other sludge with shares of minerals and organics in place of sewage sludge can also be removed as a suitable plant of this invention-in particular sludge having a solids content of 0.2 to 15, in particular 1% to 5%; Thereby the proportion of organic solids to the total solids content of the sludge should be at least 5% by weight, in particular at least 15% by weight. The contents of multichambers (purification tanks) and reservoirs from houses that are not connected to a common waste water purification system are classified into types of sludge that can be drained and treated, in particular with the appropriate equipment of the invention.

Claims (7)

Each developed tree grows on the filter bed and features at least one branch having such a watertight bed whereby an inlet for at least one sludge over the filter bed and at least one drain for filtering on the basin bed are provided. In the facility for the treatment of sewage sludge and similar sediment, A plant characterized in that an axis (8) is arranged around the opening (10) of the filtration drainage from the filtration layer (4) above the height (S) filled with sludge in the basin. The method of claim 1, Facility in which the filtration layer (4) in the shaft (8) in the region of the outlet (10) is removed (13). The method according to claim 1 or 2, The side wall (9) is characterized in that the lower part thereof appears as a base (7) extending from the waterproof bed to the middle outward. The method according to any one of the preceding claims, The branch represents several outlets 10; If necessary show several sludge inlets 18; The shafts (8) around the outlets (10) are characterized in that they form pillars for the sludge inlet conduits (17) and / or the holding passages (16). The method according to claim 3 or 4, Sludge inlet points (18) are directed towards the base (7). The method according to any one of the preceding claims, A facility, characterized in that a leak conduit (20) leading to the shaft (8) is provided in the filtration layer (4). The method of claim 6, Characterized in that the leak conduit 20 represents an elongate portion 21 at the opposite end of the outlet 10 extending from the filtration layer 4 above the filled height S of the sludge in the basin and an outlet at the sludge ridge end. equipment.