SU1629256A1 - Aeration tank - Google Patents

Abstract

The invention relates to the biological treatment of wastewater and is intended for use in the design of sewage treatment plants for domestic wastewater and organic-containing effluent, as well as on active aeration tanks. The purpose of the invention is to reduce energy consumption, reduce operating costs and reduce the cost of wastewater treatment due to the intensification of aeration processes and mixing of the treated liquid. The aero tank includes a pipeline 2 supplying the initial wastewater after primary settling, and a housing 1 in the form of an open rectangular container. Flattened sockets 3 are placed on the supply pipe 1 in a horizontal position, which ensures the distribution of incoming waste along the length of the corridor

Description

The invention relates to biological wastewater treatment and is intended for use in the design of wastewater treatment plants and organic waste streams, such as pulp and paper, hydrolysis, food and other industries, as well as for use on existing aerotanks.

The purpose of the invention is to reduce electricity consumption, reduce operating costs and reduce the cost of wastewater treatment due to the intensification of aeration processes and mixing of the treated liquid.

FIG. 1 shows an aero tank, a top view of FIG. 2 shows a section A-A in FIG.

The aero tank consists of a housing 1 in the form of a rectangular open tank, divided into corridors and equipped with an input wastewater input device and two air supply systems for aerating the mixing liquid with active sludge.

Aerotank includes pipeline 2, portions of initial wastewater after primary settling, and

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housing 1 in the form of an open rectangular container. Flattened sockets 3 are placed on the supply pipeline in a horizontal position, which ensures the distribution of the incoming effluent along the corridor length, preventing the deposition of active or at the bottom of the body and contributing to an increase in the rate of ascending and descending fluid flows. Hole 4 is formed by the bottom of the aerotank and the lower end of the longitudinal vertical partition 5, designed to bypass the treated liquid from the left side of the body to the right. The upper end of the septum is flooded below the level of the liquid to streamline the direction of the downward and upward flows of fluid. Overflow threshold 6 stabilizes the fluid level in the aeration corridors. Tray 7 collects clarified water for transporting it to the adjacent aeration tank corridor if it is necessary to continue cleaning. Pipe 8 is designed to supply air from low-pressure fans to

fluid aeration system, tubular aerators 9 of which are placed with holes downward at a depth of 20-25 cm from the liquid level, which allows the use of low-pressure vents

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ry for air supply. The pipe 10 is designed to supply air from high-pressure fans to the active mixing system or with the liquid to be processed and contains valves 11 installed in the mixing system and providing periodic formation of large air bubbles (the size of a football ball), which, when destroyed, form extensive vortices.

Aerotenk works as follows.

The initial wastewater after primary settling through the pipeline 2 enters the first air corridor 1 of the aerotank. With the help of flattened sockets 3 located in the horizontal plane, the wastewater is distributed along the entire length of the corridor. The outlet openings of the sockets, directed toward the opening 4, formed by the bottom of the aeration corridor corridor and the partition wall 5, help to remove active sludge from the floor surface of the corridor, as well as to increase the speed of the downward and upward flows of fluid. During the purification process, wastewater moves along the aeration tank corridor at a given technological speed towards overflow threshold 6, which ensures stabilization of the elevation position of the effluent in the corridor, and far through the transverse tray 7 is directed to the adjacent aeration tank corridor for appropriate after-treatment. For aeration of wastewater, air is supplied through pipe 8 by means of low-pressure fans. Tubular aerators 9, taking into account the fact that the oxygen of the air is dissolved in water in the first fractions of a second, are placed at a depth of 20-25 cm from the level of the liquid processed in the achrotank.

In order to mix the activated sludge with the treated liquid by creating upward and downward flows of liquid, as well as to swirl the latter, air is supplied through pipe 10 by means of high-pressure fans. At a depth in the range of 75-80 cm from the level of the treated liquid, valves 11 are installed, providing for the formation of large air bubbles (the size of a football ball), which, when destroyed, form extensive turbulence. Continuous

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The generation of air bubbles from tubular aerators and valves in the right corridor of the aerotank body causes a decrease in the total fluid weight in this part, thereby increasing the speed of the upward and downward fluid flows and the efficiency of mixing the activated sludge with the treated fluid.

In determining the required specific air flow rate per 1 m of wastewater, the amount of air supplied simultaneously from both systems is taken into account.

The proposed aeration tank reduces electricity consumption by simplifying blower equipment, increases oxidative power due to the possibility of intensifying mixing of the treated liquid with activated sludge, increasing productivity and degree of purification while increasing the concentration of dissolved organics due to the possibility of installing additional aerators during the aeration tank, reducing the cost of cleaning water by eliminating complex equipment and reducing operational costs, and also gives the possibility of reconstruction of existing aerotanks without shutting them down from work.

Claims (3)

1. An aero tank, a rectangular case, a supply pipe, a vertical longitudinal partition, a corridor dividing body, a tray for collecting and removing clarified water, an aeration system and mixing the treated liquid with activated sludge, characterized in that energy consumption, reducing operating costs and reducing the cost of wastewater treatment due to the intensification of aeration processes and mixing of the treated liquid, the aeration system is made of in the upper portion of the housing tubular aerator with holes directed downwards and connected to a low pressure aerator fans and the system placed under stirring provided with tubular valve aerators 1629256 for the periodical formation of large air bubbles and high-pressure fans connected to them and 2. Aerotene pop.1, characterized in that the lower end of the vertical longitudinal partition is located at a distance from the bottom of the body, and the lower end is below the liquid level, eight 3. Aerotank according to claims 1 and 2, which is based on the fact that the supply pipeline is equipped with distribution sockets, flattened horizontally, horizontally below the bottom end of the partition, and their outlet openings are directed in the direction of movement of the treated liquid. LL m #  / 5V W