PL222719B1 - System for disintegration of activated sludge in wastewater treatment plants - Google Patents

Description

(51) Int.Cl.

^{(21) Filing number: 399553} _{C02F 1/34 (2006.01)}

B05B 1/00 (2006.01)

Patent Office of the Republic of Poland (22) Application date: June 18, 2012 (54) Activated sludge disintegration unit in a sewage treatment plant

(73) The right holder of the patent: RAJCZYK JAROSŁAW, Częstochowa, PL (43) Application was announced: 23/12/2013 BUP 26/13 (72) Inventor (s): (45) The grant of the patent was announced: JAROSŁAW RAJCZYK, Częstochowa, PL RAFAŁ LEWANDOWSKI, Częstochowa, PL DOMINIK GŁOWACKI, Częstochowa, PL MARLENA RAJCZYK, Częstochowa, PL August 31, 2016 WUP 08/16 (74) Representative: item. stalemate. Jerzy Radecki

PL 222 719 B1

Description of the invention

The subject of the invention is an activated sludge disintegration unit in a sewage treatment plant for use in the activated sludge transport system to fermentation chambers.

The sewage sludge generated in the sewage treatment plant is used to produce biogas as an energy carrier.

Biogas from the fermented landfilled sewage is produced virtually automatically. In order to accelerate and intensify the biogas production process, various methods of sludge disintegration are used, which lead to the destruction of cell membranes of microorganisms that make up the activated sludge and the lysis of their cells. Organic components of sludge cells released into the solution become available as a nutrient substrate for heterotrophic living biomass. Disintegration can be carried out by many methods differing in the method of supplying energy to the sludge, i.e. mechanical method, ultrasound method, thermal method and chemical method. These methods can be used in many technological lines of sewage treatment plants. The most common place to install disintegrators is a series of excess sludge, before feeding the sludge to the anaerobic stabilization process.

Disintegration of excess sludge directed to the fermentation chambers primarily destroys the flocculent structure of the sludge, releases bound and semi-bound water, lyses cells of microorganisms and releases organic matter into solution, shortens the fermentation time, and increases biogas production.

The consequence of the disintegration process is the reduction of the volume and mass of waste generated by the treatment plant, as well as the reduction of waste management costs.

For this purpose, a nozzle is known, e.g. from the patent application WO 03091096, having a body equipped on the inlet side with a central cylindrical inlet chamber passing into a confusor and then into an expansion chamber of the flowing medium, which passes into a diffuser. The diffuser is equipped with a compensator attached to the body in the outlet part of the diffuser nozzle. The inner chamber of the compensator is shaped in such a way that it forms a diffuser gradually changing into an annular, forking chamber, then into an expansion chamber, which is located between the walls of the compensator and is connected to the stabilization chamber by means of channels placed in the compensator.

Also known from the Polish patent application No. 379966 is a plant for disintegrating activated sludge in bioreactors, which includes a bioreactor or an activated sludge collection tank, at least one pump, an activated sludge transmission line and at least one disintegration device in the form of a cavitation nozzle. The installation according to the above-mentioned solution enables the disintegration of the activated sludge in a closed system.

The aim of the invention was to develop such a structure of an activated sludge disintegration unit in a sewage treatment plant, which increases the efficiency of the treated sludge disintegration process, leading to an increase in the amount of gas obtained from it in fermentation chambers in a sewage treatment plant.

The essence of the solution according to the invention is that the assembly is formed by a cavitation nozzle, which at the outlet is connected to the cavitation member, constituting a stub pipe with the bottom wall, in the symmetry axis of which a mandrel is mounted, ending with a cavitation head of a conical shape, located at the exit of the cavitation nozzle, and in the side walls of the lower part of the stub pipe there are cavitation through holes, which from the outside of the pipe stub are surrounded by a cylindrical shield open on one side, axially connected to the cup-shaped stabilization chamber.

It is preferred that the cavitating member has a length of no more than seven times its internal diameter.

It is also advantageous if the sum of the areas of the cavitation holes is not less than the cross-sectional area of the stub pipe.

The construction of the solution according to the invention is low-cost and reliable. The team makes it possible to extend the time of impact of cavitation phenomena on the treated sludge, increase the number of their impact sites and extend the thermodynamic processes that affect the amount of biogas obtained in the fermentation chambers.

The subject of the invention is shown in the embodiment in the drawing, which shows the device for disintegration of activated sludge in a sewage treatment plant in longitudinal section.

PL 222 719 B1

The activated sludge disintegration unit in the sewage treatment plant has a cavitation nozzle 1 for pre-treatment of the sludge, which is connected from the diffuser chamber 2 side with the cavitating member 3 in the form of a stub 4 with the bottom wall 5. In the axis of the bottom wall 5 a mandrel 6 is mounted with conical cavitation head 7, and in the side walls of the lower part of the stub pipe there are cavitation through holes 8.

The applied conical cavitation head 7, located at the exit from the diffuser chamber 2 of the cavitation nozzle 1, and the cavitation holes 8 are intended to increase the disintegration efficiency of the treated activated sludge.

The exits of cavitation holes 8, from the outside of the stub pipe 4, are surrounded by a cylindrical casing 9 open on one side, serving to direct the treated sludge to the cup-shaped stabilization chamber 10, which is axially connected to it by a flange connection.

In order to increase the efficiency of the process and the durability of the working internal walls of the assembly, they were subjected to a diamond treatment process by plasma treatment.

Claims (3)

Patent claims A unit for disintegration of activated sludge in a sewage treatment plant, comprising a cavitation nozzle and a stabilization chamber, characterized by the fact that it is formed by a cavitation nozzle (1), which at the outlet is connected to the cavitation member (3), which is a stub pipe (4) with the bottom wall ( 5), in which the axis of symmetry is embedded in the pin (6) ended with a cavitation head (7) of a oblong shape, located at the exit of the cavitation nozzle (1), and in the side walls of the lower part of the stub (4) there are cavitation through holes (8) which from the outside of the stub pipe (4) is surrounded by a cylindrical cover (9) open on one side, axially connected to the cup-shaped stabilization chamber (10). 2. The assembly according to p. The method of claim 1, characterized in that the cavitating member (3) has a length not greater than seven times its internal diameter. 3. The assembly according to p. The method of claim 1 or 2, characterized in that the sum of the areas of the cavitation holes (8) is not less than the cross-sectional area of the stub (4).