SU1041520A1 - Multiple-deck shelf clarification apparatus with suspended precipitation bed - Google Patents

Abstract

Shelving stacked clarifiers CO VZVESHENNI LAYER OSADKAi comprising a housing and a conical intermediate, bottoms, voeduIhootdelitel, the dispenser located between the intermediate and perforated bottoms sealed, annular collection trough, shlamootvod conductive pipe and shlamoupltnitelnuyu chamber, characterized in that ,, with the purpose of improving the clarifier's performance and clarification efficiency, the clarifier is equipped with precipitating shelf elements, located in the sludge compacting chamber, and distributed Telem slurry established in the top conical part and is made in the form of superposed rings of S umenshayuschimis top-down internal diameters and radial guides arranged .mezhdu rings.

Description

SI

ISD

The invention relates to devices for the mechanical treatment of wastewater containing suspended solids by cleaning them in a suspended layer of sediment, followed by raking and removing it, and can be used, for example, in the pulp and paper industry to clarify fiber-containing wastewater. A clarifier is known, intended to clarify water by releasing it in a suspended sediment layer from the main mass of flocculated suspension formed during coagulation of the water being cleaned, which includes a housing, a hermetic and perforated bottom, a distributor in the form of perforated pipes. suspended sediment layer, annular collection chute of clarified water and slurry compacting fl.

A disadvantage of the known clarifier is the decrease in performance when brightening poured waters with a suspension content of more than 400 mg / l, since the distribution device consisting of a system of radially arranged perforated pipes with openings directed downwards or at a certain angle to the vertical, while passing The wastewater is gradually clogged with sediment, and the clarifier is stopped for cleaning.

The sludge trap is located at the bottom of the clarifier housing and has a flat bottom. Removal of sediment from such a bottom, especially with a large diameter of the clarifier, is associated with great difficulties, since the angle of repose of the sediment reaches 50-80 °. It is necessary to apply a complex pipe system to remove sediment, sometimes supplemented with nozzles for scouring deposits between pipes.

. To remove these deposits, the clarifier must be emptied, which also reduces its performance.

Closest to the proposed technical essence and the achieved result is a clarifier with suspended sediment layer, comprising a housing with conical and intermediate bottoms, an air separator, a distributing device located between the intermediate perforated and hermetic bottoms, an annular collecting chute / sludge discharge pipe and a sludge compaction chamber 2.

However, this clarifier provides a clear clarifying effect (5-20 mg / l of residual suspension) at a rate of gudyu water of not more than 1.3 mm / s. With increasing speed, the vertical direction of flow

water entering the clarifier disrupts the dynamic stability of the suspended layer and its removal is possible, resulting in a deterioration in the quality of treated water. In order to retain small particles that can be torn off from the suspended sediment layer, a protective zone (1.8-2.0 m) is provided in the clarifier above the upper boundary of the sludge discharge pipe, which increases the height and intensity of the clarifier. To create a suspended layer that provides good quality clarified water, it takes considerable time (3-6 hours from the start of the clarifier); A large volume of sludge compacting chamber is required for natural sedimentation of the sludge, which increases the height and metal content of the clarifier. The low concentration of the sludge returned to the process leads to an increase in the volume of water being treated.

The purpose of the invention is to improve the clarifier performance and clarification efficiency, as well as to reduce the metal structure.

The goal is achieved by the fact that a multi-rack shelf brightener with a suspended sediment layer, comprising a housing with conical and intermediate bottoms, an air separator, a distribution device located between the intermediate perforated and hermetic bottoms, an annular collecting chute, sludge disposal pipe, and a sludge packing chamber elements placed in the apex of the conical part and made in the form of rings mounted one above the other with decreasing from top to bottom internal diameters and radial guides placed between the rings

FIG. 1 shows a clarifier,. incision; in fig. 2 shows section A-A in FIG. 1 (the location of the shelf elements in the sludge compacting chamber); in fig. 3 - slurry distributor, section; in fig. 4 shows a section BB in FIG. 3

. A multi-shelf shelf brightener with a suspended sediment layer comprises a body 1, made in the form of a cone, at the apex of which a distributor of sludge 2 is located and the apex of the body is installed in a control chamber 3.

The sludge dispenser consists of a set of radially separated rings 4 with decreasing diameters of coaxial inlet openings from top to bottom, solid X5 and radial baffles b. The sedimentary shelf elements 7 are installed in the zone of clarification above the sludge disposal pipe, and in the sludge compacting chamber 3 the precipitation shelf elements 7 of the river radially are located at the level of the upper boundary of the stratified flow. The clarifier contains an air separator 8V, an annular collection tank of Forehead 9, a distribution device 10 located between the intermediate hole 11 and hermetic 12 bottoms, sludge pipes 13, an annular pipe 14 for collecting clarified water, and a port 15 for collecting clarified water. In slurry chamber 3; Under the precipitation elements 7, a raking device 16 with a drive 17 is installed. To remove the sludge, the clarifier contains a pipe 18. The defrosting device 10 consists of an air separator 8 with a vertical pipe 19. connected to radially located pipes 20 of different lengths with open end ends. The clarified water is discharged through a nozzle, 21. The device works as follows. Fiber-containing waste water is fed into the air separator 8 through a vertical pipe 19 and then through; switchgear 10 and; perforated bottom 11 water enters the upper zone of clarification. Fibrous slurry found in wastewater creates. ,; a layer of suspended sediment, the surplus of which is taken through the top of the sludge discharge pipe 13 and is evenly distributed using a horizontal sludge distributor 2 for better sedimentation of the suspension on the precipitation shelf elements 7. The suspended particles are deposited on the shelves of the precipitating elements and then; they are brought to the bottom of the sludge collector chamber 3, from where the formed sludge is removed by the raking device 16 and through the pipe 18 is continuously taken for production needs. The clarified water is collected in the annular tube 14 and discharged through the nozzle 15. Sewage water supplied through the distributor 10 passes through the sediment layer, is clarified, and the smallest fiber particles carried away by the fluid flow are deposited on the precipitation shelf elements 7 and as a result sliding them down agglomerate and return to the filter bed of suspended sediment. The clarified water is collected in the annular collection chute 9 and discharged through the pipe 21. The presence of precipitating shelf elements stabilizes the suspended sediment layer and increases the speed of the upward fluid flow in the proposed clarifier compared to the prototype from 1.1 to 1.6 mm / s which increases productivity by 75%. In addition, the installation of precipitation shelf elements makes it possible to reduce the height of the protective zone from 2 m for the prototype to 1.2 m in the proposed clarifier, which reduces its intensity. The installation of the horizontal flow rammer and the precipitation shelf elements in the sludge packing chamber reduces the time of sludge sedimentation, which allows reducing the volume and metal consumption of the sludge packer. Thus, the metal content of the whole clarifier is reduced by 4.5 tons compared with the prototype. Selection ocSemflBHHQu / M / ffmfofi, g ffffm te OmSop lu / ra / a / fofffff / a C / nffWOl / offOt /

Claims (1)

MULTI-TIRE SHELF LIGHT WITH A WEIGHTED SEDIMENT LAYER; comprising a housing with conical and intermediate bottoms, a water separator, a distribution device located between the intermediate hole and sealed bottoms, an annular collecting chute, sludge pipes and a sludge sealing chamber, characterized in that, in order to increase the performance of the clarifier and the efficiency of clarification, the clarifier is provided sedimentary shelf elements located in the slurry-packing chamber and a slurry distributor installed at the top of the conical part and made as above each dru- _about by God rings with decreasing top down $ internal diameters and radial *-trivial guides placed between the rings. GM1520