SU1000416A1 - Aeration and clarification tank - Google Patents

Description

The invention relates to devices for the biochemical treatment of wastewater and is intended for use (Vania at sewage treatment plants of cities and industrial enterprises.

A device is known that contains iKopnyc rectangular or circular shapes in the plan, supply lines and OTBQ / a wastewater, aerators, air zones (circuits, degassing and clarification, communicating through openings and recirculation). Trapezoidal-shaped trunks of the sections that are expanding are often facing downwards, and the top {are connected to pipes of circular or rectangular cross-section. Each section of the recirculation channels has a connection to the air supply line: aeration.

This design is recycled. channels allows to increase the size of the channel sections to dimensions that preclude the possibility of filling them with coarse suspensions that can be removed from the pre-cleaning facilities and, in the case of the operation of biological treatment facilities, without first upholding

; are present in the wastewater, Pbstu fueled in aeration facilities.

However, due to the fact that with such a constructive solution of the bottom recirculation unit, there is a bed and transport capacity of the recirculation flow sufficient for sucking sludge into the recirculation channels at the bottom of the wasp zone;

10 is not enough to increase the coarse impurities, then in the region of the bottom of the zone; their clarification gradually accumulates, resulting in local blockages of the bottom

15 recirculation channels, violating the uniformity of sludge return to the aeration and efficiency of work. facilities, resulting in impaired cleaning quality. The formation of procurement of rock sludge occurs after forced or emergency cessation of the air supply to aeration, when the sludge under the action of its own weight condenses on the bed of the bottom of the illumination zone. .

The purpose of the invention is to improve the reliability and efficiency of the device by stabilizing the mode

Claims (1)

30 "ozvrata, silt. This goal is achieved by the fact that in the aero-tank clarifier containing a tank, divided into zones of aeration, clarification and degassing, feed liquid supply units, air and removal of the purified liquid, removal of excess sludge, as well as the bottom recirculation unit trapezoid-shaped canals connected by pipes, the trapezoid-shaped channels with their tapering part facing downwards and at the end of the constriction with the upper plane are connected to the pipes, while the longitudinal axes of the channels and pipes intersect and the pipes are connected to The air supply line, the proposed design solution for the bottom recirculation unit, allows easy control of the sludge return mode from the clarification zone to the aeration zone, ensures its uniformity, eliminates the need for bedding on the bottom of the clarification zone, and any possibility of clogging the recirculation unit of the device. Figure 1 shows the aeration tank clarifier, the cross in figure 2 - section aa in figure 1. The device comprises a tank 1, divided by partitions 2 with openings 3, aeration chamber 4, 5 degassing and 6 clarification. Inside, the clarification chamber 6 is equipped with catchment trays 7, airlifts 8 and excess sludge removal line 9, and at the bottom it is equipped with bottom recirculation units in the form of trapezoidal channels 10 connected to pipes 11. The pipes 11 have connections to the air supply line through nozzles 12 and a perforated air duct 13. In the aeration chambers, aerators 14 and perforated ducts 15 for supplying waste water are located. The aero-clarifier works as follows. Through pipelines 15, a preliminarily clarified waste liquid is supplied to the aeration chambers 4, where it is displaced with the sludge mixture and aerated with air through the aerators 14. The aerated mixture through the holes 3 is directed to the degassing chamber 5. Here, the air bubbles are separated from the incoming mixture, after which the suspension is fed into the chamber of the illumination and moves in a compactly directed flow along the re-circulation 2 to the bottom recirculation unit, and through the system of channels 10 and pipes 11 again returns to camera 4 aeration. The inflow of sludge from the b camera brightening into the aeration chamber 4 occurs due to the difference in the density of their environments, providing a drop in hydrostatic pressure, and air supply to the pipes 11 through perforated pipelines 13 with nozzles 12. Under conditions of recirculation between the b cameras I and 4, aeration in the chamber of light, laziness results in a closed vortex of liquid circulation, which ensures the liquefaction of active sludge flakes and the formation of suspended (fluidized) sludge. The cleaned, waste liquid is filtered through the thickness of the suspended layer, collected by trays 7 and discharged out of the building. The excess sludge by airlifts 8, located at a distance from one another, is fed to the trunk 9 of excess sludge and sent for further processing. The invention makes it possible to simplify the operation of the device, to increase its efficiency and reliability, as a result of which the quality of cleaning is improved, which in turn contributes to the prevention of contamination of surface sources with SEWAGE. In addition, the capital cost of the bottom recycling unit is reduced by 60%. Aerotank clarifier comprising a reservoir divided by partitions into aeration, clarification and degassing chambers, source fluid supply units, removal of purified liquid and excess sludge removal, air ducts, aerators and a bottom recirculation unit in the form of trapezoidal channels with discharge nozzles communicated with air ducts, so that, in order to improve reliability and efficiency by stabilizing the sludge return mode, the trapezoid-shaped canals are located with their narrowing Tew down i.na their upper plane perpendicularly mounted outlet pipes .. Information sources, the received note in the examination № 1. British Patent 1,397,118, kl..S 02 C 1/06, 1974.