SU1171436A1 - Device for purifying waste water - Google Patents

Abstract

A device for cleaning waste water, containing a rectangular tank, divided by longitudinal partitions into communicating corridors, aeration system and a sludge stream recirculation unit, made of hollow columns installed along the longitudinal axis of the corridor with mechanical aerators placed in their upper part and parts by pipes attached tangentially and communicating them with adjacent corridors, characterized in that. that, in order to increase utilization efficiency and operational reliability by improving the mixing and preventing the penetration of unoxidized contaminants, the columns are provided with ring shields with horizontal shelves embedded in their upper part on the outside, the upper edges of the shields are located below the upper edges of the columns, and the horizontal shelves are at a distance from the outer surface of the columns with the formation of an annular gap, mechanical aerators are made in the form of discs with radially located on the periphery S blades down between the bows (L tami and columns, and equipped with propellers mounted axially inside the columns below the level of the tangential pipes and attached to the discs.

Description

11 The invention relates to the treatment of industrial and domestic wastewater, intended for the biochemical treatment of predominantly highly concentrated wastewater, and can be used for the treatment of wastewater from livestock farms and farms. The purpose of the invention is to increase the efficiency of use and operational reliability by improving the mixing and preventing the leakage of unoxidized contaminants. FIG. 1 The proposed device is shown in plan view; in fig. 2, section A-A in FIG. one, . The device contains a rectangular tank 1, divided by longitudinal partitions 2 into three parallel corridors 3. The corridors are equipped with pneumatic system I aeration 4. Along the axis of the central corridor are installed vertically hollow columns 5 with disc aerators 6 placed in their upper part and ring shields 7 equipped with horizontal shelves 8, and in the lower part - pipes 9 attached to the columns 5 tangentially and piercing partitions 2. Disk aerators 6 comprise an actuator 10 and a propeller 11 mounted axially inside the columns below the level of the tangential tubes 9. The screw 11 is attached to the aerator 6 by the axis 12. There are annular slots between the shields 7 and the columns 5 1 1 in which the aerator blades 13 are lowered 6. Between the horizontal flanges 8, the side napravlennmi 5 columns and pillars there are annular gaps In a possible embodiment, the axle 12 may be screw fastened. The tank 1 is provided with windows 14 and 15 for the inlet of sewage and circulating sludge, respectively. The side corridors 3 are equipped with drains 16 and pipelines 17 for draining the sludge mixture. When the device is operating, the mixture flows from the middle corridor to the side (in Fig. 1 it is shown by arrows). Therefore, level 18 of fluid in the central corridor transforms levels 19 of fluid into lateral. The upper edges of the columns 5 are located above level 18, and the upper edges of the shields 7 are below. The device works as follows. 6 Highly concentrated wastewater through the window 14 enters the central corridor 3, where it is mixed with circulating active sludge fed through the window 15. The silt mixture, moving along corridors 3, is saturated with oxygen using pneumatic aeration system 4, which ensures that the silt flakes are suspended. condition and flow of aerobic processes of biochemical oxidation of contamination. In parallel with the pneumatic aeration system, mechanical aerators 6 operate in the central corridor. In this case, the actuator 10 rotates the disk with blades 13 and the propeller 11, which creates in the columns 5 a vertical fluid flow entering the columns through pipelines 9. Next, the flow through the upper edges of the columns 5 (Fig. 2) enters the zone of action of the blades 13, is picked up by them and is thrown off the column 5. Simultaneously, through the annular gaps between the shelves 8 and the columns 5, the sludge mixture enters the zone of action of the blades 13 from the central corridor. This provides more efficient mixing of liquids. Thus, when cleaning highly concentrated effluent in the device, there are two circulation circuits of the sludge mixture: the central corridor — two side Corridors of pipe 9 — columns 5 — the central corridor. This ensures dilution of the effluents and their additional intensive aeration. Further, the silt mixture is poured through weirs 16 and is fed to the clarification via conduit 17. Upon admission to the treatment of low-concentrated drain aerators 6 can be turned off. Since the upper edges of the columns 5 are located above level 18, the reverse movement of the sludge mixture does not occur. Since in the proposed device the mixing of the flows occurs directly in the zone of action of the mechanical aerator (in the known device outside the aerator), its efficiency is higher: the part of the volume of the aeration zone that is used in the known device for mixing the flows is used for biochemical oxidation contamination. The arrangement of the upper edges of the columns above

3117

The level of the mixture in the corridor completely prevents the passage of unoxidized soils. At the same time, the propeller crushes the sludge flakes even before they enter the aerator's zone of action, which improves the biosorption process and also intensifies cleaning. With

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increasing the volume of the aeration zone by 1.0% without increasing the total volume of the device due to the intensification of mixing the construction cost

J of each unit will be reduced by 0.41, 3 thousand rubles. depending on the performance and duration of aeration.

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Claims (1)

DEVICE FOR WASTE WATER TREATMENT, containing a rectangular container in plan, divided by longitudinal partitions into communicating corridors, an aeration system and a sludge recirculation unit made of hollow columns installed along the longitudinal axis of the corridor with mechanical aerators located in their upper part and in the lower part parts with pipes attached tangentially and communicating with neighboring corridors, characterized in that. that, in order to increase the efficiency of use and operational reliability by improving mixing and preventing leakage of non-oxidized contaminants, the columns are equipped with annular shields with horizontal shelves, installed on their upper part from the outside, the upper edges of the shields are located below the upper edges of the columns, and the horizontal shelves are on distance from the outer · surface of the columns with the formation of an annular gap, mechanical aerators are made in the form of disks with radial blades located on the periphery E, lowered down between the shields and columns, and are provided with propellers, mounted axially inside the columns below the level of the tangential pipe and attached to the disks. ΟεΗΖΙΙ ns 1 1171436