RU1770289C - Aeration tank - Google Patents

Description

Phage 1

The invention relates to the biological treatment of wastewater and may find application in the chemical, petrochemical, microbiological and other industries

Aeration tank is known, consisting of a body, a bottom, pipelines for supplying air. Fittings for supplying and discharging water, sludge and air are installed on the apparatus body, and partitions are placed inside the apparatus, dividing the aeration tank into sections 1.

However, the aforementioned aeration tank has low productivity, due to the low rate of saturation of the wastewater with oxygen from the air, and has high energy costs due to the bubbling of air under high pressure through a layer of wastewater in the azroten housing. which is performed at a great height.

The aim of the invention is to increase productivity and reduce energy consumption.

To achieve this goal, an aeration tank comprising a housing with a bottom, divided by partitions into sections, fittings for input and output of waste water and sludge, contact devices from cylindrical pipes, gutters and plates, an air supply manifold; cylindrical pipes are equipped with plugs and fittings attached to their lower ends, connected to the air supply manifold, and also sealed chambers installed on their lateral surface for introducing liquid with water inlets, the lower ends of which are lowered to the bottom.

The presence of plugs with fittings connected to the manifold for air supply, the installation on the lateral surface of cylindrical pipes of hermetic chambers for fluid inlet, to which water inlets are connected, the upper end of which is in communication with the fluid inlet chamber, and the lower end is lowered to the bottom to increase productivity and reduce the power consumption of the device.

The increase in productivity is due to the fact that in the device proposed by the authors, oxygen saturation of the liquid is carried out by contact of atmospheric air with a liquid film of wastewater transporting on the surface of the contact device plates. Therefore, more oxygen per unit time is supplied to the device proposed by the authors, and therefore, an increase in active concentration sludge, which entails an increase in wastewater treatment productivity.

The reduction in energy costs is due to the fact that low-pressure fans are used to supply air to the contact devices due to the small resistance (less than 150 mm Hg) of the contact devices, whereas in an aeration tank, the liquid column exceeds 150 mm for the prototype, therefore high-pressure compressors having

high power, which causes high energy consumption.

The presence of plugs and fittings in the lower end of the cylindrical tubes of contact devices connected to the collector for

air supply allows you to not lower the contact device to the bottom of the apparatus, but to hold them in the upper part of the housing of the aeration tank and, thus, allows you to provide the necessary fluid flow in

inside the contact devices (prevents them from drowning) and a small hydraulic resistance, In the case of installing contact devices in the bottom of the aeration tank, due to the large column of liquid in the housing,

the length of the cylindrical tubes of the contact device increases dramatically, which leads to an unjustified increase in the length of the contact devices and a large resistance. Then, as is known, in the case

the absorption of oxygen by water during the film upward movement, saturation occurs when the length of the contact device is 100-200 mm, therefore, it is impractical to make contact devices with a height of more than 200 mm, due to the increase in hydraulic resistance and, consequently, energy consumption.

The presence on the lateral surface of cylindrical pipes of sealed chambers for

liquid inlets, to which water inlets are connected, the upper end of which is in communication with the liquid inlet chamber, and the lower end is lowered to the bottom that only oxygen-depleted wastewater is supplied to the contact device, which enters the contact device through the lower ends of the water inlets, lowered to the bottom of the aeration tank, which naturally allows

mix the liquid in the aeration tank and provide it with oxygen, and this increases productivity.

In the absence of pressurized chambers and water inlets, only oxygenated liquid would pass through the contact devices, and the lower layers of the aeration tank liquid would not be saturated.

Execution of water inlets

different lengths provides more uniform mixing of the liquid in the housing of the aeration tank and contributes to a better supply of oxygen to wastewater, which increases productivity.

Figure 1 shows a longitudinal sectional aeration tank; figure 2 presents a top view of the aeration tank; Fig. 3 shows a contact device; figure 4 is a section aa in fig.Z.

The aeration tank consists of a bottom 1, a housing 2, which is divided by partitions 3 into sections 4. The housing 2 has nozzles 5 and 6 for introducing and discharging waste water, as well as a nozzle 7 for introducing activated sludge. In the upper part of the housing 2, contact devices 8 are installed, made of cylindrical pipes 9, grooves 10 and plates 11. The lower end of the cylindrical pipe 9 is equipped with a plug 12 in which a fitting 13 is inserted, connected to the collector 14 for supplying air. On the lateral surface of the cylindrical pipe 9, a sealed chamber 15 for introducing liquid is mounted, to which water inlets 16 of various lengths are fixed.

Aerotank works as follows.

Waste water enters through the nozzle 5 into the housing 2 and, moving in sections 4, is in contact with activated sludge entering the aeration tank through the nozzle 7. In this case, the wastewater through the inlet pipes 16 enters the sealed chamber 15 of the contact devices 8, and then into the chutes 10. After that, the waste water is picked up by the air flowing through the collector 14 to the nozzle 13, distributed on the surface of the plates 11 in the form of a thin liquid film, is transported upward, while being intensively saturated with oxygen from the air. Saturated wastewater from the contact devices is then returned to the aerotank fluid volume and air is vented to the atmosphere. After the end of the treatment, the treated wastewater is discharged from the aeration tank through the nozzle 6.

Claims (1)

Thus, the proposed aeration tank allows increasing productivity and reducing energy costs caused by air compression, which naturally reduces the cost of wastewater treatment. SUMMARY OF THE INVENTION Aeration tank comprising a housing with a bottom, divided by partitions into sections, fittings for input and output of sewage sludge and sludge, contact devices from cylindrical pipes, gutters and plates, an air supply manifold, characterized in that, in order to increase productivity and reduce energy consumption , cylindrical pipes are equipped with plugs and fittings attached to their lower ends, connected to the air supply manifold, as well as sealed chambers for introducing liquid tee with water inlets, the lower ends of which are lowered to the bottom. Zoetzkh Air Air Amiachna Water Air # Purified 8 ode FIG. 2 ABOUT //