RU197400U9 - BIOLOGICAL WASTE WATER TREATMENT UNIT - Google Patents

Abstract

The biological wastewater treatment unit contains a tank with sewage supply pipes for treatment and purified water discharge, consisting of a series-connected mixer-mixer and an aeration tank with extended aeration, equipped with a polymer loading, as well as interconnected denitrification and nitrification zones, characterized in that includes a polymer loading regeneration system located in the nitrification zone, equipped with membrane tubular pneumatic aerators with a fine-bubble aeration system with the possibility of uniform oxygen saturation of the sludge mixture.

Description

The utility model relates to the field of public utilities and is used for biological treatment of wastewater with activated sludge in the contact mode of urban and similar industrial wastewater of small and medium volumes with a high irregularity of pollution input.

Known technical solution (RF Patent 1834858, IPC C02F 3/02, publ. 15.08.1993.) - a device for cleaning waste fluid, containing a primary sump, an aeration tank, a secondary sump with thin-layer modules and return sludge airlifts, distribution and collection trays and air supply pipes, as well as a primary sump, which is equipped with vertical partitions dividing it into three chambers, which do not reach the bottom, while a distribution tray and thin-layer modules are installed in the central chamber, the outer chambers are equipped with blocks with loading, under which there are air supply pipes, drainage the trays are connected on one side with an aeration tank, and on the other side with airlifts, which are connected to the distribution tray of the central chamber.

The disadvantage of this technical solution is the need to use additional volumes for the organization of wastewater homogenization, the impossibility of carrying out biochemical oxidation processes.

Known device for biological wastewater treatment (AS 1798325, IPC C02F 3/00, publ. 28.02.93.), Containing a tank divided into corridors, aerators, pipelines for supplying wastewater, air, activated sludge, sludge drainage pipelines mixtures and weirs, it is also equipped with a biosorption chamber installed along the longitudinal axis of the tank with an aerator longitudinally located in its lower part with devices for supplying excess sludge and removing the sludge mixture, non-woven partitions rigidly and cantilevered attached to the side walls of the chamber at an angle of 20-70 ° and staggered, as well as with additional nonwoven partitions rigidly and cantileverly attached to the main partitions, while partitions are installed at a distance from each other and with their free end do not reach adjacent partitions and side walls of the chamber.

The disadvantages of this device are the complexity of the design and the insufficient quality of wastewater treatment.

Numerous compact biological wastewater treatment plants are known, containing a housing with sewage supply pipes for treatment and purified water discharge, divided by partitions into technological containers with airlifts, aerators (RF Patent 2201405, IPC C02F 3/02, 2003, RF patent 2220112 , IPC C02F 3/02, 2003)

There is also known an installation for biological wastewater treatment, containing a housing with sewage supply pipes for treatment and purified water discharge, divided by partitions into a receiving chamber with an aerator and two level sensors, equipped with a perforated partition to form a pre-aeration chamber with an aerator installed in it, an aeration tank with an aerator installed in it, a sludge pond and a secondary sump, combined in one chamber and separated from one another by an inclined partition that does not reach the bottom, to form a secondary sump chamber equipped with a storage tank for purified water and a pump for pumping purified water, the outlet of which is connected to a branch pipe removal of purified water (RF patent for utility model 70244, IPC C02F 3/00, publ. 2008)

The disadvantages of the known installation are the insufficient degree of wastewater treatment, as well as the structural complexity of the installation.

The closest is the block of biological wastewater treatment under the RF patent for PM No. 92657, IPC C02F 3/02, publ. 03/23/2010, which consists of a tank with a flow-through type aeration tank, divided by vertical partitions into sections, equipped with a continuous pneumatic aeration system, as well as interconnected denitrification and nitrification zones, and a large-bubble aeration system is installed in the denitrification zone, and in the nitrification zone - a fine-bubble aeration system.

The disadvantage of this technical solution is the low degree of dispersion of the air flow for its uniform distribution over the volume of the container and mixing of effluents.

The technical result consists in increasing the regulation of the degree of wastewater treatment by dispersing the air flow for uniform distribution and mixing of wastewater and saturation of the sludge mixture with air oxygen to oxidize organic pollutants.

The specified technical result is achieved by the fact that the biological wastewater treatment unit contains a tank with sewage supply pipes for treatment and purified water discharge, which consists of a series-connected mixer-aeration tank and an aeration tank with extended aeration, equipped with a polymer loading, as well as interconnected zones denitrification and nitrification, while it includes a polymer loading regeneration system located in the nitrification zone, equipped with membrane tubular pneumatic aerators with a fine bubble aeration system with the possibility of uniform oxygen saturation of the sludge mixture.

The block is also distinguished by the fact that in the denitrification zone membrane tubular pneumatic aerators with a coarse-bubble aeration system are installed.

The system of regeneration of the polymer load in the nitrification zone with membrane tubular pneumatic aerators makes it possible to more thinly and evenly saturate the sludge mixture with oxygen.

The placement of membrane tubular pneumatic aerators with a coarse-bubble aeration system in the denitrification zone allows maintaining the sludge mixture in suspension.

FIG. 1 shows a cleaning unit, longitudinal section;

FIG. 2 - cleaning unit, top view;

FIG. 3 is a section along a-a in Fig. 1;

FIG. 4 is a section along B-B in Fig. 2.

The biological wastewater treatment unit is a reservoir consisting of sequential connected technological zones 1, 2 with polymer loading, which are equipped with a constant pneumatic aeration system, as well as interconnected zones of denitrification C and nitrification D.

The biological wastewater treatment unit contains an inlet pipe 3, a distribution tray 4 with a U-shaped section, a bracket 5 for fastening a distribution tray 4.

In the nitrification zone D, membrane tubular pneumatic aerators 6 with a fine-bubble aeration system are installed. In the denitrification zone C, membrane tubular pneumatic aerators 7 with a large-bubble aeration system are installed.

In the nitrification zone D there is a secondary clarifier 8 and a sludge settler 9 with a storage chamber 10, combined in one chamber and separated from one another by an inclined partition 11, as well as cassettes with a polymer load 12.

In addition, the unit contains jet shields 13, 14, 15, 16, 17, 18, 19, located in the zones of denitrification C and nitrification D, silt separator 20, sediment collection airlifts 21, 22, 23, 24, 25, airlift for collecting floating substances 26, collecting chute 27 with a double-sided toothed weir, installed in the block by means of a bracket 28 for fastening a collecting chute 27, there is a collecting chamber 29 in the chute, a bracket 30 for attaching an air duct 31 and an activated sludge pipeline 32, an outlet pipe 33 (Fig. 3, 4 ).

The unit includes a polymer loading regeneration system located in the nitrification zone, equipped with membrane tubular pneumatic aerators 6, 34 with a fine bubble aeration system.

The regeneration system is made with membrane tubular pneumatic aerators 6 along the entire length of the nitrification zone D with polymer loading.

The biological wastewater treatment unit operates as follows. Through the supply pipe through the inlet pipe 3, waste water is fed through the distribution chute 4 to the denitrification zone C. From the secondary clarifier 8, recirculated activated sludge is fed to the denitrification zone C, and nitrifying sludge from the nitrification zone D. In this case, the biological process of denitrification of nitrites and nitrates in the activated sludge occurs, which are reduced to gaseous nitrogen. The denitrification process is provided by membrane tubular pneumatic aerators 7 of constant action with a coarse-bubble aeration system, which maintain the sludge mixture in suspension.

Diaphragm tubular pneumatic aerators 6, 7 are connected to a system of air ducts through which air is supplied. Membrane tubular pneumatic aerators 6, 7 are made with the ability to disperse the air flow for uniform distribution and mixing of effluents throughout the volume of these technological zones 1, 2.

Further, the effluents enter the nitrification zone D, where membrane tubular pneumatic aerators 6 with a fine bubble aeration system are installed, through which the sludge mixture is saturated with air oxygen. Air oxygen is required for the oxidation of organic pollutants and the reduction of ammonium nitrogen to nitrites and nitrates. The sludge mixture from the denitrification zone C passes through the sludge separator 20, where it is partially clarified, and enters the next purification stage into the nitrification zone D.

The jet shields 15, 18, 19 then direct the liquid to be purified through removable cassettes 12 with polymer loading, which are designed to build up biomass and filter the treated wastewater. The polymer load is made in the form of a fibrous-porous non-woven material made of synthetic fibers, interconnected by cohesive spikes at the points of contact. In the nitrification zone D there is a system for the regeneration of the polymer load of removable cassettes 12.

Further, the effluent passes through the jet shields 16, 17, 11 and enters the secondary clarifier 8 and the sludge settler 9, in which activated sludge is separated from biologically treated waters. The sludge mixture settles in the accumulation chamber 10 of the sludge settler 9, from where it is taken by airlifts 24, 25 and fed again to the denitrification zone C, and the excess sludge is removed through the outlet pipe to the sludge platforms.

The collection of treated effluents is carried out by a collecting chute 27 with a double-sided toothed weir, in which a collecting chamber 29 is provided for collecting treated wastewater.

All membrane tubular aerators of the unit operate continuously. Thus, the proposed installation uses the so-called extended aeration method, which also makes it possible to increase the degree of wastewater treatment. In addition, the elimination of pauses in aeration, i.e. periodic switching of aerators from working to non-working mode and vice versa, allows to increase the reliability and durability of the unit. The combination of the sludge separator and the secondary clarifier in one chamber greatly simplifies the design and operation of the installation, since the unloading of the formed excess activated sludge must be performed less frequently and only from one chamber.

Claims (2)

1. A biological wastewater treatment unit, containing a tank with sewage supply pipes for treatment and purified water discharge, consisting of a series-connected aeration tank-mixer and an aeration tank with extended aeration, equipped with a polymer load, as well as interconnected denitrification and nitrification zones, which differ in that it includes a system for the regeneration of the polymer load, located in the nitrification zone, equipped with membrane tubular pneumatic aerators with a fine bubble aeration system with the possibility of uniform oxygen saturation of the sludge mixture. 2. The unit according to claim 1, characterized in that in the denitrification zone there are membrane tubular pneumatic aerators with a coarse-bubble aeration system to maintain the sludge mixture in suspension.

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