RU2108843C1 - Horizontal settler - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: this is intended for treating potable and industrial water by gravitational settling in settler. Horizontal settler has reservoir with inclined bottom having recess for sediment. Also provided are pipe unions for delivery of primary water and branching of purified water, system of draining and branching of sediment, air-distribution system, and sediment-collecting perforated system located on settler bottom after air-distribution system and connected with proportioning pump which delivers recirculated sediment for secondary utilization at coagulation of water. EFFECT: higher efficiency. 3 dwg

Description

 The invention relates to water supply and can be used for the preparation of drinking and industrial water by gravitational precipitation in water of pre-coagulated suspended substances of mineral and organic origin.

 A known method of purification of suspended solids of natural water by sedimentation in a horizontal sump with reuse of sediment [1].

 The closest in technical essence and the achieved result is the design of a horizontal sump with increased specific hydraulic load [2].

 Design drawback - no device is provided for taking part of the sediment for reuse in coagulation (sediment recirculation).

 The essence of the invention lies in the fact that a horizontal sump containing a tank with an inclined bottom, having a pit for sludge, nozzles for supplying source water and drainage of purified water, a drainage and drainage system for sludge, an air distribution system, is additionally equipped with a sediment-collecting perforated system located at the bottom behind the air distribution system and connected to a metering pump that feeds recycled sludge for reuse in the coagulation of water.

 Figure 1 shows the sump, front view; figure 2 is the same, a top view; figure 3 is a graphical dependence of the amount of precipitate.

 The horizontal sump contains a tank 1 with an inclined bottom 2, made with a pit 3 for collecting sediment. The pit 3 is equipped with a discharge pipe 4 sludge with a valve 5. A pipe 6 for supplying cleaned water is connected to a discharge pipe 4 sludge and is equipped with a valve 7. In the lower part of the tank 1 on the stands 8 in front of the pipe for water supply 6 there is an air distribution system 9 in the form of a comb of perforated pipes . The sump is equipped with a clarified water collection system. The design of the sump includes a device that allows you to take part of the sediment from its sedimentary zone for recycling. The device consists of a system of perforated pipes 11, assembled into a comb, on which control gates are installed 12. The comb at the end is assembled into a single pipe 13, which removes the sediment necessary for recirculation to a separate tank or to the suction pipe of the pump 14, with which the sediment is fed into head of structures. The clarified water is collected by a system of perforated pipes 15 and is supplied to the chamber 16.

 The sump works as follows. When the valve 5 is opened, from the pipe 6 of the source water supply through the pipe 4, the source water enters the tank 1 after mixing it with the introduced and recycled sludge. Then, the clarified water enters the air mixing zone located above the air distribution system 9. Having passed the flocculation zone, the treated water enters the precipitation zone, where the formed flakes fall to the bottom. The settled flakes at the bottom of the sump become a flocculent gel precipitate, which is collected by system 11 and fed to the head of the structures using a metering pump 14.

 It has been established from operating experience with a dispersed system for collecting clarified water that sediment is distributed fairly evenly over the area of the sump. From these conditions, we determine the amount of precipitated precipitate, then we determine the required collection area required for recycling, depending on the initial turbidity of clarified water (10 - 100 mg / l). The dependence is expressed graphically in figure 3. With a large range of the initial turbidity of the clarified water, the collection system may be longer; then, to collect the sediment for recycling, slide valves 12 are installed on the prefabricated perforated system 11 to control the amount of sediment to be taken. The distance between the perforated nozzles of the prefabricated system is determined by the angle of slip of the sediment to the holes and 0.8 - 1.2 m can be taken to clarify low-mud waters.

 The clarified water is collected by the perforated pipe collecting system 15 and enters the chamber 16.

 The use of sludge recycling makes it possible to reduce the reagent used by one third, improve the deposition process due to the presence of residual aluminum in the sludge, but also significantly reduce the amount of sludge discharged.

Claims (1)

 A horizontal sump containing a tank with an inclined bottom having a pit for sludge, nozzles for supplying raw water and drainage of purified water, a drainage and drainage system for sludge, an air distribution system, characterized in that the sump further comprises a sediment collection perforated system located at the bottom of the sump behind the air distribution system and connected to a metering pump supplying recirculated sludge for reuse in the coagulation of water.

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