RU64617U1 - DEVICE FOR DEEP BIOLOGICAL WASTE TREATMENT - Google Patents

Abstract

The utility model relates to the field of biological wastewater treatment and can be used for deep treatment of urban wastewater, including both domestic and industrial wastewater. The objective of the device is to increase the efficiency of wastewater treatment with the removal of ammonia nitrogen. The device includes an aeration chamber with pneumatic aerators and an aeration column, denitrification chambers, and sedimentation tanks in the form of gutters with a longitudinal bypass gap. The improvement consists in the fact that an aeration column is allocated in the aeration chamber, and the airlifts are removed from the conical part of the chamber. To remove excess activated sludge from the system, an airlift is provided in each sump with the collection of settled sludge from the sludge collector. The use of the device provides a deep biological treatment of wastewater from organic substances and stable removal of ammonium nitrogen, as well as a decrease in the percentage of moisture of excess activated sludge.

Description

The utility model relates to the field of biological wastewater treatment and can be used to treat urban wastewater, including both domestic and industrial wastewater.

The known device in the form of a cylindrical body with a conical bottom, including an aeration chamber with pneumatic aerators, an airlift for circulating activated sludge, located along the device axis, gutters in the form of gutters with a lower longitudinal slot and prefabricated trays (see copyright certificate for the invention No. 1541193 of 22.02 .88 g).

A disadvantage of the known device is that it oxidizes organic substances in full biological treatment to BOD purified water 15-20 mg / l with partial removal of nutrients, which does not meet current standards for the disposal of treated wastewater in water.

Closest to the considered one is a device for deep biological wastewater treatment, in the form of a cylindrical body with a conical bottom, including an aeration chamber with pneumatic aerators, an airlift to remove excess activated sludge from the conical part and settling tanks in the form of gutters with a lower longitudinal bypass slot and collecting trays, with highlighted vertical partitions of segmented denitrification cameras equipped

flat loading modules and sludge collectors above the overflow slit in sumps equipped with airlifts directed to denitrification chambers (see patent No. 52846 for a utility model).

The disadvantage of this device is that in the sludge zone of the aeration chamber, stagnant zones with rotting sludge are formed, as a result of which periodic clumping of sludge with an increase in the concentration of ammonium nitrogen and phosphates in purified water is observed.

The objective of the proposed utility model is the elimination of stagnant zones in the aeration chamber, and the stabilization of wastewater treatment by biogenic elements, as well as reducing the load on silt sites by water.

The problem is solved by the fact that an aeration column is equipped in the center of the aeration chamber, and the airlift of the removal of excess activated sludge is transferred from the conical part of the casing to the sumps of the settling tanks.

The device is illustrated by drawings, where in: figure 1 shows a section along the axis; figure 2 is a plan.

The device, in the form of a cylindrical body with a conical bottom 1, includes: aeration chamber 2 with pneumatic aerators 3 and aeration column 4; denitrification chambers 5 with flat loading 6, separated by vertical partitions 7, inlet pipe 8, distribution trays 9; settling tanks 10 in the form of gutters with a longitudinal slit 11 and collecting trays 12; discharge pipe 13.

In the sumps 10 above the slit 11, sludge collectors 14 are installed, which are a pipe plugged at the ends, having openings in the upper part along the entire length and airlifts 15 from the bottom of the pipe directed to the distribution tray 9, as well as airlifts 16 of excess activated sludge.

To the airlifts connected pipes 17 for supplying air.

The device operates as follows.

Initial wastewater enters the distribution trays 9 through the inlet pipe 8, circulating activated sludge from the sludge collectors 14 with airlifts 15 is sent here. From the trays, the sludge mixture flows into the denitrification chambers 5 with a flat charge 6. In the denitrification chambers, nitrogen compounds (nitrates) are split. ) with the release of gaseous nitrogen and oxygen, due to which some of the organic contaminants in the wastewater are oxidized. Flat loading ensures process stability due to attached anaerobic biocenosis.

From the denitrification chambers, the sludge mixture is displaced under the partitions 7 into the aeration chamber 2, equipped with pneumatic aerators 3 with an aeration column 4, creating a powerful sludge mixture flow, preventing the formation of anaerobic zones and ensuring complete mixing of wastewater with activated sludge throughout the volume of the aeration chamber. Biological treatment of the remaining organic pollutants by aerobic microorganisms in the presence of air is carried out here.

Through the longitudinal slots 11, the sludge mixture is transferred to the settling tanks 10, where after passing through a suspended layer of activated sludge, the clarified purified water is collected in trays 12 and discharged from the device.

In sedimentation tanks 10, the settled sludge enters the sludge collectors 14, from where part of the sludge by airlifts 15 is pumped into the denitrification chambers 5, and excess sludge by airlifts 16 is discharged for further processing.

The use of the device provides deep biological wastewater treatment from organic substances, stable removal of ammonia nitrogen.

In addition, the removal of excess sludge directly from the sludge collectors reduces the load on the sludge sites, since activated sludge has a lower percentage of moisture than in the aeration chamber.

An example of using a utility model.

The proposed device is implemented in one of the urban-type settlements of the Moscow region.

In accordance with the drawings (figure 1 and figure 2) was converted 4 of 10 devices equipped with a prototype (see above). The throughput of each device was 800 m ³ / day. The table provides comparative sanitary-chemical analyzes of the operation of devices for 2005-2006.

Indicators Incoming wastewater Purified on a prototype device Purified on the proposed device one 2 3 four BOD ₅ mg / l 180 5-10 5-10 Suspended Substances, mg / L 190 5-12 4-8 Ammonium nitrogen, mg / l thirty 0.5-1.5 NGO 0.6 Nitrite, mg / L - 0.25-0.3 0.12-0.25 Nitrates, mg / L - 8-12.5 6th Humidity of excess activated sludge,% - 99.9 99,4

Claims (2)

1. A device for deep biological wastewater treatment in the form of a cylindrical body with a conical bottom, including an aeration chamber with pneumatic aerators, segment denitrifying chambers equipped with flat loading modules, gutters in the form of gutters with a lower longitudinal bypass slot and silt collectors, airlift circulating and excess activated sludge, characterized in that an aeration column is equipped in the center of the aeration chamber. 2. The device according to claim 1, characterized in that the airlift output of excess activated sludge is transferred from the conical part of the body to the sludge collector.