SU1558877A1 - Airtank-settler - Google Patents

Abstract

The invention relates to the biochemical treatment of wastewater and is intended for the separation of settling and aeration zones in aeration tanks with a pneumatic aeration system. The dividing partition in the aero-sump allows to increase the reliability and efficiency of recirculation of the sludge mixture from the sedimentation zone to the aeration zone due to its flotation compaction in tanks 4 and forced transportation through the discharge pipelines 6 to the aeration zone. At the same time, the ends 8 of the discharge pipelines can be placed directly under the windows of the wastewater discharge into the aeration zone, which makes it possible to increase the efficiency of the facility. 2 Il.

Description

The invention relates to the biochemical treatment of wastewater, in particular, to aeration facilities combined with secondary settling tanks, and can be used in aeration tanks with a pneumatic aeration system for domestic and industrial wastewater treatment.

The purpose of the invention is to increase the reliability and efficiency of recycling the sludge mixture from the settling zone to the aeration zone.

FIG. Figure 1 shows a separator separator mounted in the aero-settling tank, longitudinal section; in fig. 2 - the same general view.

The aero-settling tank contains a dividing partition in the form of parallel-installed partition walls 1 that do not reach the bottom, separating chambers 2 and 3 for settling and aeration. Vertical, not reaching to the bottom of the tank 4 are installed at the partition and on their side surface, from the side of the aeration chamber there are made throughput slots 5. The discharge pipes 6 are concentrically mounted inside the containers 4. The upper ends of the pipes 6 are made in the form of a funnel 7, and the lower ends 8 are installed vertically, with the open end up above the aerators 9. Inside the tanks 4, air distributors 10 are installed located below the level of the liquid under the throughput gap 5.

Aero-settling works as follows.

When aerating the sludge mixture in the aeration chamber 3 through the aerators 9, the fluid flow acquires a rotational motion (Fig. 1). The silt mix between partitions 1 enters the settling chamber 2, where it is separated into clarified water and activated sludge, which is returned to the aeration chamber through the bottom slit, and the clarified water is collected by the collecting tray in the upper part of the settling zone and is discharged from the structure. The main flow of the mixture through the throughflow slots 5 enters the inside of the vertical tanks 4, where the activated sludge is subjected to flotation by bubbles of air supplied through the small-porous air distributors 10. Floated

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activated sludge through the funnels 7 enters the discharge pipelines 6 and then through the open lower ends 8 into the aeration chamber 3 due to the ejecting effect of the flow of aerated liquid moving upwards (Fig. 1) above the aerators 9. Thus, the bulk of activated sludge Forcibly transported from the partition wall directly to the aeration zone. If necessary, the lower ends 8 of the discharge pipes 6 can be installed under the distribution windows of the original wastewater, which provides an increased concentration of activated sludge at the places of intake of wastewater.

The proposed aeration tank makes it possible to increase the reliability and efficiency of recirculation of the sludge mixture from the settling zone to the aeration zone.

Claims (1)

Invention Formula An aero-sedimentation tank containing defrosting and aeration chambers with pneumatic aerators, a dividing partition separating the sedimentation and aeration chambers, in the form of two parallel-installed vertical partitions not reaching the bottom, one of which is located below the liquid level in the aeration chamber, characterized by that, in order to increase the reliability and efficiency of the recirculation of the sludge mixture from the settling zone to the aeration zone, it is equipped with fine porous air distributors and vertical containers not reaching the bottom and “evenly spaced between the partitions along their entire length, the tanks are equipped with discharge pipes concentrically installed inside them, the upper ends of which are made in the form of a funnel and arranged at the liquid level, while the other ends are located, vertically open end up in the aeration chamber Aerators, On the lateral surface of the tanks, turned to the aeration chamber, there are made throughput slots located below the level of the liquid above the air distributors, while the latter are fixed inside the vertical storage tanks at half their height. Editor N. Yatsola Compiled by V. Dzubo Tehred A. Kravchuk Order 815 Circulation 787 The State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR was entered in 113035, Moscow, Zh-35, 4/5 Raushsk nab. Phie.1 Proofreader T. Malets, Subscription