CZ20032485A3 - Sewage sludge treatment plant - Google Patents

Abstract

The sewage sludge treatment device consists of a feed belt screen press (1), opening into the mixing hopper (2) of the spindle pump (5), into which the vibrating conveyor (3) of burnt powdered lime with an operating tank (4) also opens, the operating tank (4) being provided with a slot outlet (7) and arranged so that the gap (m) between the slot outlet (7) and the trough of the vibrating conveyor (3) is adjustable. The vibrating conveyor (3) of burnt powdered lime is equipped with a regulation of operating parameters and the outlet of the mixing spindle pump (5) is connected to the discharge pipe (6) of the mixture of sludge and lime. To control the operation and signal the function, the device is equipped with a pressure sensor (8) and a temperature sensor (10) of the treated sludge behind the spindle pump (5) and a temperature sensor (9) of the undrained sludge and the belt filter press (1).

Description

Equipment for sewage sludge treatment.

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a plant for the treatment and treatment of sewage sludge.

BACKGROUND OF THE INVENTION

Sludges arising from the operation of waste water treatment plants must be treated before being removed from the waste water treatment plants and their further use. This prior art treatment is carried out, for example, by anaerobic or aerobic decomposition of the organic sludge mass and subsequent mixing of the sludge with an alkaline agent, which is preferably quicklime. The purpose of this treatment is to stabilize the sludge by stopping its fermentation, enriching for calcium and destroying pathogenic microorganisms. In this treatment, however, the amount of lime added must be controlled, as disclosed, for example, in US 5 401 402, whereby the lime dose may be greater or less than optimal. With a small amount of lime, the sludge cannot be used in agriculture because it is not sufficiently free of pathogenic organisms, and with a large amount of lime the cost of sludge treatment increases. Furthermore, complex and expensive devices and systems based on the complex determination of the cohesiveness or dry matter content of the treated sludge as described in WO 00/02823 are used to specify the amount of lime added.

SUMMARY OF THE INVENTION

The aforementioned drawbacks of the prior art are largely eliminated by a sewage sludge treatment plant comprising a sludge feed conveyor, a mixer hopper pump and a fired lime vibratory conveyor with a process container according to the invention, which consists in that the sludge feed conveyor is a screen belt filter press, by which the dewatered sludge from the sewage treatment plant is conveyed to the screw pump hopper and the fired powdered lime reservoir is provided with a slotted outlet between which and the vibrating conveyor trough conveying the necessary amount of lime to the pump pump hopper.

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To ensure more accurate control and to control the operation and signaling of the operation of the device, a pressure sensor and temperature sensor of treated sewage sludge are inserted downstream of the screw pump and another non-dewatered sludge temperature sensor is located in the inlet to the screen filter press.

The device according to the invention makes it possible to treat sludges from waste water treatment plants in a simple manner, whose resulting composition will be more balanced and will comply with the requirements of Decree No. 382/2001 Coll., Especially for their use in soil fertilization.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail by means of a drawing in which a plant for treating and sanitizing sewage sludge with lime is schematically illustrated.

DETAILED DESCRIPTION OF THE INVENTION

The device according to the invention shown in the figure comprises a screen belt filter 1, which flows into the hopper 2 of the spindle pump 5. The vibrating conveyor 3 also opens into the hopper 2. via the outlet 2 of the process container 4 and the trough of the vibratory conveyor 3 is adjustable. The hopper 2 opens into a screw pump 5, which is connected to a drain line 6.

Downstream of the screw pump 5 is a pressure sensor 8 and a temperature sensor 10 of the treated and treated sewage sludge, and a further non-dewatered sludge temperature sensor 9 is provided on the screen belt filter press at the inlet of the filter press filter 1.

The function of the device according to the invention is as follows. The sludge from the sewage treatment plant enters essentially the thickened state through the screen belt filter and into the hopper 2 of the spindle pump 5. Simultaneously, in the required proportion to the sludge quantity, burnt powdered lime from the processing tank 4 is fed via the vibrating conveyor 3. is controlled by a suitable gap m between the slotted outlet 7 of the process container 4 and the trough of the vibratory conveyor 3 and is further controlled by changing the parameters of the vibratory conveyor 3.

The pressure sensor 8 and the sensor 8 signals are used to control the addition of lime more precisely and to control the operation and signal the operation of the device

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The sewage sludge 2 and the quicklime powder fed to the hopper 2 are mixed in the spindle conveyor 5 first by a screw and then by a spindle embedded in the rubber liner and enter the downstream discharge line 6 through which the sludge and lime mixture sludge storage container or container.

Sanitary sludge emerges from the pipeline, which complies with the requirements of Decree No. 382/2001 Coll., Free of thermotolerant californian bacteria, enterococci and salmonella.

Claims (4)

PATENT CLAIMS A plant for treating sewage sludge, comprising a sludge feed conveyor, a hopper pump with a hopper, and a fired powdered lime vibratory conveyor with an operating hopper, characterized in that the feed sludge conveyor is a filter press screen (1) leading to a mixing hopper ( 2) a screw pump (5), into which the vibratory quick-powdered lime conveyor (3) with an operation tank (4) also opens, wherein the operation tank (4) is provided with a slot outlet (7) and arranged so that the gap (m) ) between the slot outlet (7) and the channel of the vibrating conveyor (3) is manually adjustable. Device according to claim 1, characterized in that the quick-fired lime vibrating conveyor (3) is equipped with a control of the operating parameters. Device according to claim 1, characterized in that the sludge outlet from the mixing screw pump (5) is connected to the sludge-lime mixture discharge line (6). Apparatus according to claim 1, characterized in that a pressure sensor (8) and a temperature sensor (10) of the treated sludge are arranged downstream of the screw pump (5) and another non-dewatered sludge temperature sensor (9) is arranged at the inlet of the sludge into the screen filter press. (1).