RU235547U1 - WASTEWATER BIOLOGICAL TREATMENT UNIT - Google Patents

Abstract

The utility model relates to biological treatment units for domestic wastewater of cities, settlements and similar wastewater compositions, concerns variants of a second-stage biological treatment unit for wastewater. The unit includes a housing, in the central part of which there is an aeration zone with an inlet for compressed air and a submerged plate loading installed in blocks. On the outer side of the housing in the lower part there is a manhole, drains for emptying. The wastewater inlet is located in the lower part of the housing, and the outlet is in the upper part of the housing. The aeration zone is made in the form of a cylinder. Between the aeration zone and the outer wall of the housing there is a settling tank along the entire height of the tank for separating wastewater from a suspended layer of activated sludge. In the upper part of the settling tank there are thin-layer elements installed at an angle of 60° relative to the bottom of the housing. In the middle part of the settling tank relative to its width there are airlifts. In the upper part of the housing along the periphery above the thin-layer elements there are ring trays. In the lower part of the housing, aerators of the central and peripheral zones are installed. The outlet of the activated sludge is located in the upper part of the housing. Technical result: increasing the efficiency (quality) of wastewater treatment and the stability of the treatment process due to increasing the oxidizing capacity and uniform distribution of activated sludge in a suspended state throughout the entire volume of wastewater in the block. 4 fig.

Description

The utility model relates to units for biological treatment of domestic wastewater of cities, populated areas and wastewater similar to them in composition, and concerns variants of a unit for biological treatment of second-stage wastewater.

A biological wastewater treatment unit is known [Patent RU No. 2790712, IPC C02F 3/30, C02F 9/00, published. 28.02.2023], comprising a housing divided by partitions into several process zones, in which a denitrification zone, a deoxidation zone, an aeration zone, a secondary settling tank, a zone for collecting excess and circulating activated sludge are provided, while in the lower part of the partition separating the denitrification zone and the aeration zone, openings are made to ensure the flow of purified water from one zone to another, in the upper part of the partition separating the denitrification zone and the deoxidation zone, an opening with an insert directing the flow is made, a partition is installed in the center of the denitrification zone to create a circulating water flow, a pipeline for feeding wastewater is run into the denitrification zone, aerators are installed in the aeration zone, a pumping device for circulating activated sludge is installed in the zone for collecting excess and circulating activated sludge, axial pumps are installed in the denitrification zone, the deoxidation zone and in the secondary settling tank.

The disadvantage of this cleaning unit is that the equipment takes up a large area.

The objective is to create a compact purification unit by combining an aerobic zone, a thin-layer settling tank and filtration through a suspended layer of activated sludge in one container.

The technical result is an increase in the efficiency (quality) of wastewater treatment and the stability of the treatment process due to an increase in the oxidizing capacity and uniform distribution of activated sludge in a suspended state throughout the entire volume of wastewater in the block.

The technical result is achieved due to the fact that in the housing of the biological wastewater treatment unit in the central part there is an aeration zone made in the form of a cylinder with inlets for compressed air and wastewater. In the central part of the housing, a flooded plate loading is installed in blocks, which (blocks) are located one above the other. Between the aeration zone and the outer wall of the housing, a settling tank is located along the entire height of the tank for separating wastewater from a suspended layer of activated sludge. In the upper part of the settling tank, thin-layer elements are installed at an angle of 60° relative to the bottom of the housing. Thin-layer elements in the settling tank are installed at an angle of 60° for several reasons: increasing the surface area, creating turbulence, improving sedimentation, reducing hydraulic resistance, simplifying cleaning. An angle of 60° is optimal for achieving maximum operating efficiency and the technical result. In the middle part of the settling tank relative to its width there are airlifts, due to them there is recirculation of activated sludge into the aeration zone, providing destruction of organic pollutants and nitrification of ammonium nitrogen salts. In the upper part of the body along the periphery above the thin-layer elements there are ring trays, and in the lower part of the body there are aerators of the central and peripheral zones, providing oxidizing capacity and uniform distribution of activated sludge. On the outer side of the body in the lower part there is a manhole, drains for emptying, an outlet of activated sludge; the inlet of waste water is located in the lower part of the body, and the outlet in the upper part of the body.

Fig. 1 shows a sectional view of a wastewater biological treatment unit.

Fig. 2 shows a biological wastewater treatment unit - side view.

Fig. 3 shows the wastewater biological treatment unit in section C-C.

Fig. 4 shows the wastewater biological treatment unit in section B-B.

The wastewater biological treatment unit comprises a housing 1, in the central part of which an aeration zone 2 is located, made in the form of a cylinder. In the central part 2 (aeration zone), a flooded plate loading 5 is installed in blocks, which consists of sheets attached parallel to each other. The blocks of the plate loading 5 are installed one above the other along the entire height of the central part (aeration zone) 2. A settling tank 6 is located in the peripheral part of the housing 1. In the upper part of the settling tank 6, thin-layer elements (a block of lamellas) 7 are installed at an angle of 60° relative to the bottom 8 of the housing 1. In the middle part of the settling tank 6 relative to its width, airlifts 9 are located. In the upper part of the housing 1, in the peripheral zone 12, ring trays 10 are located above the thin-layer elements 7, and in the lower part of the housing 1, aerators 11 of the central 2 and peripheral 12 zones are installed. On the outer side of the housing 1 in the lower part there is a manhole 13, weirs 14 for emptying the central part 2 (aeration zone) and weirs 15 for emptying the housing, an inlet of waste water 4 into the central part (aeration zone) 2. The outlet 16 of the activated sludge is carried out in the upper part of the tank. The inlet 17 of the compressed air into the airlifts 9 is located at the top. In the upper part of the housing 1 there is an outlet 18 of the waste water from the annular trays 10, an inlet 3 of the compressed air into the aerator of the aeration zone 2, an inlet 19 of the compressed air into the aerator of the peripheral zone 12.

The submerged plate loading 5 is a block of sheets "POLIVOM", which are fastened together with polyethylene tubes. The porous-fibrous material (hereinafter "POLIVOM") is intended for use as a flat loading to intensify the operation of aeration tanks in order to increase the oxidation rate of contaminants and achieve the required quality of water purification.

Thin-layer elements (lamella block) 7 are made of rigid sheet materials (PVC profile).

Thin-layer element 7 is designed to intensify the process of sedimentation of suspended, colloidal substances and particles of activated sludge, as well as to increase the productivity and efficiency of settling tanks.

Let's look at an example of how the device works.

The inlet 4 of wastewater occurs from below into the central part 2 of the biological treatment unit, it passes through the plate loading 5, on the surface of which immobilized active biomass develops, providing, together with the circulating active sludge, the destruction of organic contaminants and nitrification of ammonium nitrogen salts of wastewater, due to which an increase in the efficiency (quality) of treatment is achieved. The active sludge leaves through the outlet 16 (the upper part of the tank) and is fed by airlifts 9 into the central part 2.

To oxidize organic contaminants and maintain the activated sludge in a suspended state, compressed air is constantly supplied to the central part (aeration zone) 2 of the biological treatment unit by air blowers through the compressed air inlet 3 into the aerators 11. Compressed air is supplied to the peripheral zone 12 of the biological treatment unit through the compressed air inlet 19 into the aerators 11 into the peripheral zone 12 in order to prevent the settling of suspended substances. As a result of saturation of the sludge mixture with dissolved oxygen in the central part (aeration zone) 2, effective mixing of the activated sludge is ensured, due to which an increase in the efficiency (quality) of the degree of purification is achieved.

In the peripheral zone 12, additional oxidation of organic components occurs and overflows through the top into the settling zone. Purified wastewater is separated from suspended biomass (activated sludge) in the settling zones of the block. Large flakes capture smaller particles and, under their own weight, slide down the inclined surface of the thin-layer element 7, due to which an increase in the efficiency (quality) of purification is achieved, down into the conical part of the settling tank 6. Airlifts 9 recirculate activated sludge into the central part (aeration zone) 2. Compressed air is constantly supplied to airlifts 9 by blowers through the compressed air inlet 17.

Simultaneously with the destruction of organic wastewater contaminants, the process of nitro-denitrification occurs during biological treatment: with the help of attached and suspended biomass, the nitrogen of ammonium salts is successively converted into oxidized forms - nitrites and nitrates and then restored to molecular nitrogen. Biologically treated water is collected in ring trays 10 and at the outlet 18 of wastewater is discharged to the next stage of treatment.

Repair work on the biological treatment unit is carried out through manhole 13. The biological treatment unit is emptied of wastewater and excess sludge through drain 14 for emptying the central part 2 and drain 15 for emptying the body, including during repair work and in emergency situations.

Claims (1)

A wastewater biological treatment unit comprising a housing in the central part of which an aeration zone with an inlet for compressed air is located and a submerged plate loading is installed in blocks, a manhole, drains for emptying are located on the outer side of the housing in the lower part, the wastewater inlet is located in the lower part of the housing, and the outlet is in the upper part of the housing, characterized in that the aeration zone is made in the form of a cylinder, a settling tank is located between the aeration zone and the outer wall of the housing along the entire height of the tank for separating wastewater from a suspended layer of activated sludge, and in the upper part of the settling tank thin-layer elements are installed at an angle of 60° relative to the bottom of the housing, airlifts are located in the middle part of the settling tank relative to its width, annular trays are located in the upper part of the housing along the periphery above the thin-layer elements, and aerators of the central and peripheral zones are installed in the lower part of the housing, the outlet of activated sludge is located in the upper part of the housing.