SU1535850A1 - Apparatus for aerating waste water - Google Patents

Abstract

The invention is intended for use in aeration facilities at biochemical wastewater treatment plants and can be used in various industries. The purpose of the invention is to increase the efficiency of using the device by ensuring the forced recycling of activated sludge, controlling its consumption and mixing with the sludge mixture. The application of the proposed device design allows continuous forced recirculation of activated sludge from secondary settling tanks due to moving return sludge lines 5 and the agitators 7 installed in them, as well as mixing return sludge with the aerotank sludge mixture due to nozzles 4 attached at an angle to the guide tube 1. 1 Il.

Description

The invention relates to devices for the aeration of wastewater during their biochemical treatment in aeration facilities and can be applied to domestic and industrial wastewater treatment plants.

The aim of the invention is to increase the efficiency of use of the device by ensuring stable recycling of the activated sludge, controlling its consumption and mixing with the sludge mixture.

The drawing shows a device for aeration of wastewater, a longitudinal section.

The wastewater aeration device contains a guide tube 1, inside of which a supercavity propeller 2 is installed in the upper part, a reflective cone 3 installed under the guide tube 1. The nozzles 4 are attached to the tube 1 at an angle along the flow of the fluid below the screw 2. Requirements 5 return sludge is installed with the possibility of longitudinal movement inside the nozzle 4 and form annular gap 6 between them. Paddle mixers 7, whose axis 8 is horizontal, are fixed inside the pipelines 5, with agitator blades that act in part by piping edge. Air ducts 9 are installed above the screw 2 in the upper part of the pipe 1.

The device works as follows.

When the propeller 2 is rotated, the fluid is injected down the guide tube 1 to the bottom of the structure. At the same time due to the resulting rarefaction

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hell screw 2 air from the atmosphere through air ducts 9 is sucked into intu 2, dispersed by it, mixed with liquid and injected down the tube 1. The flow of the air / water mixture moving down along the pipe 1 will lead to rotation of the blade agitators 7 (see drawing). In return sludge pipelines 5, the opposite ends JQ of which are located in the secondary sedimentation tank of the silt (not shown). Due to the rotation of the agitators 7, under the action of the fluid flow moving through the pipe 1 in the pipelines 5 (directly behind the paddle mixers) a reduced pressure area is created, as a result of which the circulating activated sludge is sucked through the pipelines 5 to the stirrers 7 and delivers with them to the guide pipe 1, where is intensively mixed with the main stream of air-water mixture moving from screw 2 to cone 3. Reflecting from cone 3, water-air mixture 25 rises, supplying the entire volume of the aeration zone with air oxygen. When fluid flows through pipe 1, the sludge mixture is ejected from the aeration zone through the annular gap 6 into pipe 1, so that activated sludge coming from secondary settling tanks through pipelines 5 is mixed with the sludge mixture directly at the entrance to the guide pipe 1, while contact they are provided in an enriched oxygen-supplied water stream moving from screw 2. If it is necessary to reduce the consumption of circulating activated sludge, pipelines 5 push along pipe A from the guide the tubes, while the blades of the agitators 7 partially come out of the fluid flow moving through the tube 1 (in the near-stenotic zone the velocity of the fluid is lower than at a distance of 1/2 the length of the propeller blade from its center), their rotation speed decreases, The vacuum in the pipelines 5 decreases and, as a result, the consumption of activated sludge drawn from the secondary settling tanks decreases. If necessary, terminate circ30

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The active pipelines from the secondary settlers piping 5 extend to the extent that the blades of the agitators 7 come out of the fluid flow moving along the pipe 1, while their rotation stops and} as a result, the circulation of the activated sludge from the secondary settlers stops. When this occurs, only the ejection through the gap 6 of the sludge mixture and mixing of the sludge mixture of the aeration zone with air and wastewater entering the aeration zone. The increase in the flow rate of the circulating activated sludge is carried out in reverse order.

The application of the proposed device design allows for the stable recirculation of aKiHBuoro sludge from secondary settling tanks, controlling its consumption and mixing with the sludge mixture in the oxygen-enriched LOW-AIR flow moving through pipe 1, while changing the flow rate of the active silt being pumped from the secondary settling tanks has effected devices from work, which generally improves the efficiency of its use.

Claims (1)

Invention Formula A wastewater aeration device containing a supercavitational propeller mounted on a vertical shaft inside the guide tube in its upper part, which is air-tight, dy, that, in order to increase the efficiency of use of the device by ensuring steady recycling of the affective sludge, controlling its consumption and mixing with the sludge mixture, it is equipped with paddle agitators, return sludge pipelines and nozzles attached at an angle to the guide pipe below the screw along the two-way fluid, while the return sludge piping is installed with the possibility of longitudinal movement inside the nozzles, and the axes of the paddle agitators are arranged horizontally and secured inside the in in place of attaching them to the pipe. Sotdyx U circulating sludge In about id uh /// ////// SS / // //  // h ////; ; 777 //////. // ss