DE202012101660U1 - Wastewater treatment plant for SBR aeration tanks - Google Patents

Abstract

A wastewater treatment arrangement (1) for SBR aeration tanks, comprising
- a clear water outlet (3) with a drain valve (10), a drain pipe (11), a swivel joint (14) and a drain (12),
- An agitator (5) with a stirrer drive (7), a stirring shaft (8) and a propeller stirrer (9) and
- A floating sludge discharge with inflow (16), a piping (18) and a scum pump (17) and
- a control and regulating device,
wherein the components of the clear water outlet (3), the agitator (5) and the floating sludge outlet (16, 17, 18) are arranged on a common floating body (2) and that the components following the level of waste water level with the floating body (2) together vertically are designed to be movable.

Description

The invention relates to a wastewater treatment arrangement for a SBR aeration tank.

An SBR aeration tank is a wastewater treatment plant in which the wastewater is operated by the sequencing batch reactor (SBR). It is characteristic of the SBR process that the treatment steps necessary for the treatment of wastewater take place in chronological succession in only one vessel, the aeration tank. SBR wastewater treatment is a highly flexible process that can very well compensate for load and hydraulic load fluctuations. It is particularly advantageous in this method that the SBR aeration tank is designed as structurally relatively simple structure and that one-or multi-street concepts can be realized by the problem-free expansion option. The SBR process is suitable for municipal, commercial and industrial wastewater.

The procedure of the SBR process can be simplified to describe that after the inflow of wastewater into the SBR aeration tank thorough mixing of the waste water and the aeration of the basin, after which sedimentation of the activated sludge from the wastewater and then the clear water outlet of the purified wastewater the upper layers of the aeration tank is performed. The process cycle closes with the renewed inflow of wastewater to be treated in the aeration tank.

Within the treatment steps, the clear water discharge decisively determines the quality of the wastewater. In the prior art, various realizations of clear water discharge are known. The devices used for this purpose are referred to as decanters, clear water drawers or shortened as clear water withdrawal.

From the US 4,695,376 A For example, a decanter for SBR plants emerges, which is guided by a float body on the surface of the waste water on a rod following the water level vertically.

In the EP 1 652 821 A1 discloses a clear water withdrawal device for SBR plants, wherein a floating body is coupled via a lever with an electromechanical actuator height variable relative to the float, by means of which the discharge valve for the treated wastewater is released and drain the clear water after sedimentation of the activated sludge from the upper layers of the basin can.

From the US 4,997,557 A is a floating mixing and ventilating Dekantereinheit known whose components are interconnected via a support frame. The decanter unit has the corresponding components for the clear water removal, which are carried by the framework system of individual floats. An agitator is also connected to the unit via the scaffolding system, with the agitator additionally being coupled to a ventilation inlet.

A disadvantage of the aforementioned prior art is that the individual device components for treating the wastewater in the aeration tank are not optimally matched to one another and thus can not act efficiently. The installation and repair costs are relatively high and also the impairment of the treatment result of the clear water, by scum is not sure ruled out.

It is an object of the invention to provide a wastewater treatment arrangement which is of simple design and whose components are modularly connected to the wastewater treatment arrangement for optimum interaction. Furthermore, it is an object of the invention to enable effective control and regulation of the plant, wherein as few individual components in the treatment arrangement have to be included separately in the SBR method.

The object is achieved by an article according to the features of patent claim 1, further developments of the invention are specified in the subclaims.

The object of the invention is achieved in particular by a waste water treatment arrangement for SBR activated sludge tanks, which comprises a clear water outlet with a drain valve, a drain pipe, a swivel joint and a drain. Furthermore, an agitator with a stirrer drive, an agitator shaft and a propeller stirrer, a floating sludge discharge and a control and regulating device for controlling and regulating the individual components are provided. The components of the clear water outlet, the agitator and the floating sludge discharge are arranged on a common floating body, which moves the components together vertically following the level of the wastewater level.

The concept of the invention is that the individual components of the clear water outlet, the agitator and the floating sludge discharge are all functionally dependent on their arrangement to the water surface of the wastewater. A common floating body can thus these essential components of the Treat wastewater treatment system in an optimal way to the wastewater level and constructively realize a simple positioning in the respective treatment step for all components. The joint arrangement and spatial concentration of said components also leads to an optimal interaction of the components.

A development of the invention is that the float is designed as a frameless pontoon so static that the attachments and receptacles for the components of the clear water outlet, the agitator and the Schwimmschlammabzuges are integrated into the floating body.

Particularly advantageously, the float is designed as a flat octagonal pontoon and accessible by persons to be used in addition for revision or repair purposes in a simple manner.

Particularly advantageously, the invention is configured in that in addition to the above components a Fällmitteldosiervorrichtung is arranged on the float whose Fällmittelaufgabestutzen is arranged above the agitator, so that the precipitant is introduced directly into the suction area of the agitator in the basin and optimally distributed in the SBR aeration tank ,

It has been found to be particularly advantageous to arrange the propeller stirrer in a horizontal plane with the drain valve of the clear water outlet, wherein it needs no special mention, however, that the stirrer and the clear water outlet are active at different times within the SBR process.

The drain valve drive is formed in an advantageous embodiment of the invention as a hydraulic drive.

If the wastewater level drops sharply, it is advantageous if a decanter support is provided which positions the wastewater treatment arrangement at the bottom of the activated sludge tank above the expected level of the sludge layer in order to prevent contamination of the clear water outlet and in particular of the valve.

It is particularly advantageous if the floating sludge discharge is integrated with its components in the floating body. A dry scum pump is complained on the float. On the suction side, the floating sludge pump is internally piped to the inflow opening for the floating sludge in the floating body. The inflow opening of this casing is height adjustable and can be individually adapted to the water levels.

According to an advantageous embodiment of the invention, the floating sludge discharge from four horizontally arranged pipes is formed with a pump for sucking the scum from the surface.

Of particular importance is that the scum drain has suction through which the scum is located above the clear water outlet valve. Furthermore, a flexible conduit for removing the scum is provided.

It has also been shown that it is advantageous to arrange shut-off devices for the scum on the piping of the scum.

Furthermore, in certain operating situations, it is advantageous to integrate sludge detectors into the scum drain in order to achieve a systematic reduction of the scum and the associated improvement of the quality of the clear water and the SBR process as a whole.

Within the waste water treatment device, a control and regulating device is provided, which has at least one turbidity sensor and / or a fill level probe.

The agitator is designed to be particularly efficient as a vertical agitator and the agitator drive as electrically driven slow-speed motor. Furthermore, the agitator drive is frequency-controlled, so that a control of the circulation rate can be performed electronically.

It is particularly advantageous that only a common electrical supply is formed for all components of the clear water outlet, the agitator and the scum sump.

It should be emphasized that the formation of the wastewater treatment arrangement in this centralized form results in that the individual components are arranged together at an optimal location in the basin.

Another advantage is that a common supply line and a common control, for example by means of PLC, is possible and that the centralization and standardization of the individual tasks and functions is accompanied by a cost saving.

The wastewater treatment assembly with its individual components can be manufactured as a complete and ready to connect module. Maintenance is also easy thanks to easy access to the components.

Further advantages are that the Fällmitteleinbringung on the stirrer is very effective, as well as the sludge extraction is integrated above the stirrer in the waste water treatment device at the optimum location. The scum is driven by the stirrer to the suction device and can be removed efficiently.

As special advantages of the invention, the increase of the efficiency of the device functions by the optimal spatial allocation of the components to each other to call, which is accompanied by a shortening of the process phases and an improvement of the discharge values. The multiple functions of the device increase the effectiveness and intensity of wastewater treatment. The wastewater treatment system functions as a system and ensures optimal operation through appropriate control and regulating devices. Another advantage is that the compact design allows a significant reduction in investment and operating costs. It should also be mentioned as a special advantage that the maintenance work can be carried out in a simpler manner and more cost-effectively.

These advantages can be achieved by integrating the individual components of the wastewater treatment arrangement in a building which is designed as a common floating body.

Further details, features and advantages of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings. Show it:

1 : Wastewater treatment plant in side view and

2 : Wastewater treatment plant in top view.

In 1 and in 2 is a wastewater treatment plant for SBR aeration tanks 1 shown schematically in the side view and in plan view.

The wastewater treatment system 1 consists essentially of the components of the clear water outlet 3 , which is also referred to as a decanter, the scum with its individual components and the agitator 5 ,

The individual components are on the float 2 attached or integrated into it, so that the wastewater treatment arrangement 1 with the float 2 forming a structural unit.

The float 2 combines thus the function of the static admission of the individual components as well as the function of the common guidance and optimal positioning depending on the water level by its float characteristics.

The clear water outlet 3 has at its inlet a drain valve 10 , which via a drain valve drive 13 operated, or switched. The drain valve drive 13 is located outside the water on the float 2 and is protected by a protective cover 4 protected against the weather.

The clear water outlet 3 still has the drainpipe 11 on which a swivel joint 14 with the float 2 and another pivot 14 with the process 12 connected is. About the drain valve 10 , the drainpipe 11 and the process 12 the clarified wastewater leaves the activated sludge tank as so-called clear water after the sedimentation phase.

In 1 the system is shown in an operating position in which a clear water outlet is just possible because in this position the float 2 with the various components on the decanter pad 15 sits down and another lowering of the wastewater treatment system 1 into the underlying sedimented mud is prevented.

The agitator 5 has a stirrer drive 7 and a stirrer shaft 8th and the propeller stirrer mounted thereon 9 , which is designed such that a vertical flow of the waste water is generated. The wastewater is pumped from top to bottom and flows to the propeller stirrer 9 horizontal to the water surface again.

In 1 is still a Fällmitteldosiervorrichtung 6 at the wastewater treatment plant 1 which is directly above the propeller stirrer 9 is arranged in the flow collection area. The precipitant thus passes directly into an area where it is detected after entering the wastewater from the vertical flow and thus optimally distributed in the basin.

For reasons of fluid mechanics improvement of clear water discharge of the float 2 octagonal designed.

The control and regulation of the wastewater treatment system 1 via a control and regulating device not shown separately. The dynamic test-dependent control of the clear water withdrawal makes it possible to automatically adapt the sedimentation and decanting phase to the actual sludge settling properties.

The discharge rate is over the time-varying water level, measured at the level probe on the float 2 , determined. A costly flow meter in the drain line can thus be omitted as a rule.

The optimal position of the stirrer ensures by the floating arrangement an optimal circulation of the tank contents in the anaerobic phase.

The agitator drive for the agitator 5 is designed as an electrically operated slow-speed motor and therefore energetically particularly advantageous.

By the control and regulating device is the circulation capacity of the agitator 5 adapted to the level of the aeration tank and the sludge settling properties. The speed is adjusted to the required operating conditions by means of frequency control based on level and turbidity. As a result, significant energy savings are possible.

In the float 2 above the agitator 5 is the feed line for the precipitant from the Fällmitteldosiervorrichtung 6 , The precipitant serves to improve the settling properties of the activated sludge and the PO4-P effluent values. The pipeline ends immediately above the propeller stirrer 9 , whereby an immediate, more intensive mixing with the activated sludge is achieved. By specifically introduced precipitant this can be reduced in the amount of the same effect.

The floating sludge discharge for the process-dependent occurring scum is in the common float 2 integrated. Structurally, this is solved so that four horizontally arranged pipelines as piping 18 inside the float 2 be arranged and the intake ports 16 , Also called inflow, are on the circumference of the float 2 distributed. The intake openings 16 for the scum are changeable in their position to the water surface and thus adapted to special Schwimmschlammeigenschaften customizable. The floating mud pump 17 for the suction of the scum is on the float 2 attached and the scum passes through a flexible line outside the basin. The flue pipes are equipped with built-in valves and can thus mechanically switched on or off according to the scum deposits, or throttled. In addition, sludge detectors are attached, which are the switching on and off of the scum pump 17 regulate for the Schwimmschlammabsaugung.

It has been shown that with the vertical agitator a targeted floating sludge transport in the basin to the agitator 5 with the adjacent clear water outlet 3 takes you. For the extraction of the scum there are therefore ideal conditions. The suction of the concentrated scum with reduced water content then allows an effective mechanical or chemical treatment of the scum.

The float 2 is designed for maintenance walk-in and all components have a common electrical supply and control line.

The advantages of the illustrated embodiment of the invention are various and are summarized below.

The wastewater treatment system 1 allows the automatic adjustment of the clear water discharge to rising and falling water levels through the floating system and there is a homogeneous, horizontal horizontal clear water discharge. Vertical flows and thus sludge aspirations of sedimented sludge during clear water withdrawal are prevented and the full hydraulic performance with minimum clearance to the sludge bed is achieved with the proposed wastewater treatment arrangement 1 allows.

Due to the clear water discharge under the water level in combination with a baffle, the suction of scum is prevented.

The system of clear water as well as scum dump is completely closed during the reaction phase, thereby preventing the undesirable ingress of sludge into the system.

By the float 2 an unsinkable construction is realized and by the level sensors, the control technology detection of the flow rate is made possible without additional sequence measurement.

Due to the design, the system is very good in combination with a turbidity control adjustable and the sedimentation and decanting phase is automatically adapted to the actual sludge properties. Due to the accessibility of the wastewater treatment arrangement, a maintenance-friendly installation of the process probes on the clear water outlet is possible.

In addition to the clear water extraction device is also the circulating device with the agitator 5 at the rising and sinking water level by arrangement on the common floating body 2 automatically and optimally adapted.

The vertical agitator allows by the special propeller shape a flow which is formed in the manner of a so-called flow roll. The adjustment of the recirculation capacity to the level in the SBR aeration tank and to the sludge settling properties via the frequency control of the recirculation capacity on the basis of the level and the turbidity leads to an energy cost savings compared to uncontrolled systems.

LIST OF REFERENCE NUMBERS

1

Wastewater treatment plant for SBR aeration tanks

2

float

3

Clear water outlet, decanter

4

guard

5

agitator

6

Fällmitteldosiervorrichtung

7

agitator

8th

agitator shaft

9

propeller

10

drain valve

11

drain pipe

12

procedure

13

Drain valve drive

14

swivel

15

Dekanterauflage

16

Inflow opening, intake opening for scum

17

Floating sludge pump

18

Internal piping scum

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 4695376 A [0005]
• EP 1652821 A1 [0006]
• US 4997557 A [0007]

Claims (15)

Wastewater treatment arrangement ( 1 ) for SBR aeration tanks, comprising - a clear water outlet ( 3 ) with a drain valve ( 10 ), a drainpipe ( 11 ), a rotary joint ( 14 ) and a procedure ( 12 ), - a stirrer ( 5 ) with a stirrer drive ( 7 ), an agitator shaft ( 8th ) and a propeller stirrer ( 9 ) and - a floating sludge outlet with inflow openings ( 16 ), a piping ( 18 ) and a scum pump ( 17 ) and - a control and regulating device, wherein the components of the clear water outlet ( 3 ), the agitator ( 5 ) and the floating mud deduction ( 16 . 17 . 18 ) on a common floating body ( 2 ) are arranged and that the components following the level of the wastewater level with the float ( 2 ) are formed vertically movable together. Wastewater treatment arrangement ( 1 ) according to claim 1, characterized in that the float ( 2 ) is designed as a frameless pontoon so static that the attachments and receptacles for the components of the clear water outlet ( 3 ), the agitator ( 5 ) and the floating mud deduction ( 16 . 17 . 18 ) in the float ( 2 ) are integrated. Wastewater treatment arrangement ( 1 ) according to claim 1 or 2, characterized in that the float ( 2 ) is designed as a flat octagonal pontoon and accessible to persons. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 3, characterized in that additional a Fällmitteldosiervorrichtung ( 6 ) on the float ( 2 ) is arranged, the precipitant feed nozzle via agitator ( 5 ) is arranged. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 4, characterized in that the propeller stirrer ( 9 ) in a horizontal plane with the drain valve ( 10 ) of the clear water outlet ( 3 ) is arranged. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 5, characterized in that the piping ( 18 ) of the floating sludge discharge inside the floating body ( 2 ) and that inflow openings ( 16 ) for the scum in the outer walls of the float ( 2 ) are integrated in the height of the water surface. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 6, characterized in that the piping ( 18 ) of the floating sludge discharge from four horizontally arranged pipes and a scum pump for sucking the scum from the water surface is formed. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 7, characterized in that the floating sludge discharge in its position to the level of the water surface customizable suction openings ( 16 ) having. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 8, characterized in that shut-off devices for the scum on the casing ( 18 ) of the scum are arranged. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 9, characterized in that sludge detectors in the scum ( 4 ) are integrated. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 10, characterized in that the control and regulating device has at least one turbidity sensor and / or a level sensor. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 11, characterized in that the agitator ( 5 ) as a vertical agitator and the Rührwerksanatrieb ( 7 ) are designed as electrically operated slow-speed motor. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 12, characterized in that the circulation rate through the agitator ( 5 ) is adapted by means of the control and regulating device to the level and the Schlammabsetzeigenschaften adaptable. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 13, characterized in that the agitator drive ( 7 ) is formed frequency-controlled. Wastewater treatment arrangement ( 1 ) according to one of claims 1 to 14, characterized in that for all components of the clear water withdrawal ( 3 ), the agitator ( 5 ) and the floating sludge discharge a common electrical supply is formed.

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