SU691411A1 - Unit for waste water purification - Google Patents

Description

(54) DEVICE FOR CLEANING WASTE WATERS

When the area ratio is more than 0.5, there are increased water velocities in the section between the water distributor and the walls of the flotation cell, which can lead to the removal of a part of the water-air mixture into the settling chamber, and, consequently, to a deterioration of the cleaning effect.

2. The location of the water distributor at a depth of 0.75–0.8 in the height of the flotation cell allows the creation of a still zone below the water distributor and a steady flow of water when entering the settling chamber. A change in the depth of the water distributor leads to a decrease in the useful volume of the flotation cell or to a disruption in the stable operation of the settling chamber.

3. When air bubbles ascend, an inevitable collision occurs, they become larger, as a result of which the absolute surface of the gas and solid phases is reduced, the floating effect decreases. All the chambers with a constant living section in height, including cylindrical ones, have this disadvantage.

Making the chamber in the form of a truncated cone allows you to create an increased concentration of air bubbles in the upper zones and thus maintain the flotation capacity of the bubbles, despite their coarsening.

Making the chamber at an angle of less than 78 ° leads to an increase in air concentration, a significant enlargement of air bubbles and the removal of large amounts of water with foam (10%), which causes an increase in the volume of facilities for its subsequent processing.

The camera at an angle of large, 83 °, brings the shape of the camera to a cylindrical one.

In addition, when the camera is made in the form of a truncated water velocity in the lower zone of the settling chamber, it is slightly larger than in the upper one, which leads to the creation of a layer of suspended sediment, which helps to further filter contaminants through it. In this case, the settling chamber works on the principle of known illuminators with suspended sediment.

The drawing shows a device for wastewater treatment, vertical section.

The device comprises a cylindrical-conical body, the lower conical part of which is intended for collecting and subsequently removing sediment. In the upper cylindrical part of the body there is an annular settling chamber 1, a flotation chamber 2 arranged coaxially with it, made in the form of a truncated cone, forming which is inclined at an angle of 78–83 ° to the horizontal plane, and a disk water distributor 3 with a reflective shield 4 and direction partitions. The water distributor 3 is located in the flotation cell 2 at a depth of 0.75-0.8 of its height, and has an area of 0.4-0.5 of the area of the larger base of the chamber 2.

The device is equipped with a pipeline 5

for supplying the source liquid, a peripheral tray 6 with a pipe 7 for collecting and discharging clarified water, a scraper 8 and a tray 9 for collecting and discharging foam, as well as means for removing sediment from the conical sedimentary part of the body, in this case pipeline 10.

The device works as follows. Sewage water, pre-saturated with air, is fed through conduit 5 to the reflection board 4 and guides

water distribution walls 3, evenly distribute the mixture over the entire cross section of the flotation chamber 2, in which air is released in the form of tiny bubbles, flotation of fat particles and fine suspended weights of Vesan with the formation of foam at the surface of the chamber removed by the upper scraper, 8 into the foam discharging tray 9 . Larger non-floating particles fall through the bottom of the flotation cell 2 into the settling chamber 1.

and precipitate, which creeps along the bottom conical part to the center, followed by removal through pipe 10. In the lower zone of the settling chamber, at certain upward speeds, a layer of suspended sediment is formed, which promotes additional filtration of water. Purified water from the settling chamber through the catchment tray 6 is removed from the device by pipeline 7.

The proposed device removes 90-95% of suspended solids from wastewater.

and 95-98% fat.

Claims (2)

1. Wastewater treatment device containing a cylindrical-conical case with flotation and settling chambers located therein, units for supplying the source liquid and purified water, a water distributor installed in the flotation chamber, collection and removal units for foam and sediment, characterized in that, in order to increase the effectiveness of purifying wastewater, the chamber is made in the form of a truncated cone, forming which is tilted at an angle of 78-83 ° to the horizontal, the water distributor is located at a depth of 0.75-0.8 of the height of the flotation cell, and the ratio of the area of water distributor to the bottom of the flotation cell is equal to 0.4-0.5. 2. The device according to claim 1, characterized in that the water dispenser is made disk and is provided with a baffle plate and baffles. Sources of information taken into account in extterstyle I. Karavaev I.I., Reznik N.F. Experience in using floaters of the Central Research Institute type for wastewater treatment. M., “Transport, 1972, p. sixteen.