SU983076A1 - Waste water cleaning apparatus - Google Patents

Description

(54) DEVICE FOR CLEANING WASTE WATER The invention relates to sewage, namely to facilities for the treatment of wastewater from undissolved suspended solids (pollution) mainly organic. A device for the treatment of wastewater from suspended matter is known, which represents a cylindrical (radial) sedimentation tank with a sludge collector and an integrated Mt cylindrical screen guide. set in such a way that, in order to increase the productivity and the effect of wastewater purification from suspended substances, the distance of the lower edge of the generator of this screen from the bottom of the settling tank is 1 / 10-1 / 30 of the working depth of the latter C. However, the design of this device is practically inefficient and does not allow to achieve an increase in productivity in wastewater treatment containing finely dispersed and colloidal suspended solids of mainly organic origin, which do not precipitate even under the influence of the built-in cylindrical guide screen. This device is relatively effective only in the case of wastewater treatment from coarse sedimentation of organic and mineral pollution, which proves that it is difficult to use them under production conditions. It is also known a device for the purification of wastewater from suspended substances, which is an oadialyosh septic tank; in the center of which the cover is coaxially installed and. annular tubular perforated aerator (air distributor) of the driaerator. The sump is equipped with supply and discharge pipelines, respectively contaminated and treated wastewater, a peripheral (circular) tray for collecting the latter, scrapers for raking sediment to the central sludge deposit, a sludge pipeline and a device for removing wastewater {2. The installation of a pre-trapping unit in the center of the settling tank and theft of a temporary (for 10–20 min) 398 aeration plant leads to an agglomerate .note coarsening due to sticking from individual finely dispersed suspended particles of contaminants of mainly organic origin -. The coarse particles are then better deposited on the bottom of the sedimentation tank, as a result, the waste water is more fully clarified - it is purified from suspended organic and colloidal mineral matter. However, the effectiveness of wastewater treatment in these devices is also insufficient, as a result of which the pH is not widely used in modern sewage treatment plants. The aim of the invention is to increase the efficiency of wastewater treatment from finely dispersed and colloidal suspended substances, mainly of organic origin, and to increase the productivity of the cleaning device or structure. This goal is achieved by the fact that a device containing a cylindrical body, divided by a cylindrical partition into pre-aeration chambers with a tubular perforated aerator, supporting and discharging pipelines, scraper mersanism for collecting and removing sludge a spillway located coaxially in the settling chamber of cylinders | x) with a conical partition with an angle of inclination of its conical part to the vertical of 7080 ° forirovannymi aerators mounted between the baffles, and a conical reflective shield placed under aerators FIG. 1 schematically shows a device, a longitudinal section; in fig. 2 - there is a plan view. The wastewater treatment unit consists of a radial settling tank with a vertical wall 1, a peripheral circular collecting tray 2 of clarified waste water, a sloping bottom 3 and silt powder 4. The settling tank also has a supply pipeline 5 of contaminated waste water , a central vertical shaft 7 with scrapers 8, a reflective reflective shield 9 and an electric actuator 10. In the central part of the settling basin, coaxially installed: an annular distribution device 11 with a gear weir 12 and a pre-air cylindrical mold with wall 13, the lower part of which is refracted by an angle of 70-80 relative to vertical

axis towards the center of the bilge.

The pre-aerator in the center has a cylindrical partition 14. This partition divides the pro into

clarification or purification of waste liquid, where intensive fallout of flakes (at the bottom of the 3 sedimentation tanks) of active flakes occurs to two zones - the mixing zone of contaminated waste water and activated sludge in the center and the flocculation zone between partitions. An annular tubular perforated azrator 15 and at least two coaxially arranged annular tubular perforated aerators 16 are installed in the lower part of the pre-aerator zone. All aerators are connected to the main inlet air duct 17. A small distance from the wall 13 of the pre-aerator and the circumferential circular collecting tray 2 is in a small distance from the pre-aerator and the peripheral circular collecting duct 2 in a small distance from the peripheral circular duct 13 and the peripheral circular collecting duct 2 in the drainage compartment and a peripheral circular air duct 17. semi-submerged partitions 18 and 19 are installed in the device area, which, like all other equipment, are rigidly fixed to the farm 20 mounted on the walls of the settler 1. The device works as follows. Suspended water contaminated with suspended solids along with a certain amount of excess activated sludge from the aeration tank through pipeline 5. is fed into the ring distributor 11 and through the toothed overflow 12 evenly flows into the re-pereaerator zone. Here, under the action of upward flows of small (up to 5 mm in diameter) air bubbles, injected by a blower machine (compressor) through the air duct 17 into the annular tubular perforated azrator 15, thorough mixing of the sewage water with active sludge and some of the mixture with oxygen is carried out. The duration of mixing of water and sludge - staying in the mixing zone - should be 2-3 minutes. Hence, the circumference of this pre-aerator zone is easily determined by the product. mixing time per known wastewater and shea consumption. From the zone of mixing the silt mixture above the reflective shield 9 and under the partition 14 passes into flocculation, where with the help of annular tubular perforated aerators 16 this mixture is additionally saturated with air oxygen and simultaneous meephlo of sludge with active sludge is agglomerated in it. The residence time of the sludge mixture in this zone is 10 minutes. from which, as well as from the known consumption of a mixture of waste water with activated sludge, the volume of the flocculation zone is determined. In the future, the sludge mixture through the upper edge of the wall 13 of the pre-aerator and under the semi-submerged partition 17 evenly posnagj - device settling zone -

, 5.983Р76

silt with suspended matter stuck to them. Here, the waste water is effectively clarified, and then under the bottom partition 19 enters the peripheral circular collecting tray 2, from where pipeline 6 is diverted for further processing (for example, to complete biochemical treatment in aeration tanks).

The sediment from the bottom 3 is scraped by scrapers in the sludge bed 4 and is gradually removed from the settling tank. The scrapers 8 are rigidly fixed to the vertical shaft 7 and rotated by means of the electric drive 10.

The pre-expander of the proposed design, located in the device’s center, has an annular water dispersion and waste water zone and active sludge divider with a toothed spillway, raspolozdoyu flakes forming, having coaxially annularly in the settling chamber, njt-shaped, perforated with the aerator, and the part of the aerator, which is annularly coaxial in the settling chamber; It allows 15-on-conic part of it to the vertical 70-80 °,

20%, as compared with the known devices, which are additional perforated tubular1) "improve the efficiency of wastewater treatment from suspended pollutants, mainly of organic origin, due to their agglomeration with sludge sludge and short-term (within 10-13 min) aeration with small bubbles of air. At the same time, the productivity of the entire device increases from 20 to 25%; the duration of treatment (stay) of wastewater in it is reduced to 70 minutes instead of 90 minutes from known ones.

Claims (2)

1. Author's certificate of the USSR N 585126, cl. C 02 F 3/12, 1976. 2. Yakovlev S. V. and others. Kanali qi. M., stroiizdat, 1972, p. 13. / // / / J f7 fff // Phage. 1920