CN112174452A

CN112174452A - Hydraulic cyclone pretreatment type sand removing system for aeration grit chamber

Info

Publication number: CN112174452A
Application number: CN202011244843.8A
Authority: CN
Inventors: 许斌; 韩萍; 王翥田; 傅强; 许泽宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-01-05

Abstract

The invention provides a hydraulic cyclone pretreatment type aeration grit chamber desanding system, which belongs to the technical field of sewage treatment.

Description

Hydraulic cyclone pretreatment type sand removing system for aeration grit chamber

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a sand removing system of a hydrocyclone pretreatment type aeration grit chamber.

Background

At present, an aeration grit chamber desanding system applied in the industry is widely used for an aeration grit chamber of a sewage treatment plant, and relatively large substances such as sludge, sand and the like precipitated at the bottom of the grit chamber are sucked out of the chamber by a sand suction pump. The sand suction bridge reciprocates back and forth along the steel rail on the surface of the sand setting tank, a sand suction pump (submersible sewage pump) on the bridge sucks out sand-water mixture at the bottom of the tank and lifts the sand-water mixture to a certain height, the sand-water mixture enters a sand discharge water tank parallel to the sand setting tank and flows into a sand-water separator for sand-water separation, and meanwhile, a skimming plate on the bridge scrapes scum on the water surface into a slag tank at the tail end of the tank. The separation mode is simple, the separation efficiency is low, a part of organic matters are attached to the sand and run off, and the settleability of the sand-water separator and the performance of spiral sand output are influenced due to large water quantity and high flow speed.

Disclosure of Invention

The invention provides a hydraulic cyclone pretreatment type aeration grit chamber desanding system, wherein a hydraulic cyclone desander is additionally arranged on a sand suction bridge of an aeration grit chamber and is manufactured according to the screening principle when solid particles in fluid flow in the desander in a rotating manner, after water flow enters equipment from a water inlet of the desander in a tangential direction under certain pressure, strong rotating motion is generated, water with low density rises under the combined action of centrifugal force, centripetal force and fluid drag force due to different sand water densities, sand with high density is discharged from an underflow sewage outlet at the bottom of the equipment, grit with the size of more than or equal to 0.1mm can be pre-separated, sand water mixed liquid with high sand content is discharged from the underflow sewage outlet at the bottom of the equipment into a sand discharge water tank and then flows into a sand water separator for sedimentation and sand water separation, an inclined plate sedimentation device and a plane water distribution weir groove are additionally arranged in the sand water separator, the inclined plate sedimentation device prolongs the water flow path, the uniform distribution of the plane water distribution weir grooves reduces the water inflow speed, and the original water flow mode (from turbulent flow to turbulent flow and then to the water outlet) in the sedimentation water tank of the sand-water separator is changed into from turbulent flow, turbulent flow (action of the plane water distribution weir grooves) to laminar flow (action of the inclined plate sedimentation device) and then to the water outlet, so that gravel which is larger than or equal to 0.2mm can be smoothly separated from sewage, and the separation efficiency of the sand-water separator is effectively improved. And the mixed liquid containing the light fine sand flows back to the aeration grit chamber. The sand removing system comprises a sand suction bridge, a hydraulic cyclone sand remover, a sand suction pump water outlet pipe, a sand discharge water tank, a sand-water separator, a plane water distribution weir trough and an inclined plate sedimentation device, wherein the sand suction bridge is arranged on a guide rail at the top of a concrete pool wall of an aeration grit chamber; the hydraulic cyclone desander is arranged at the upper part of the sand suction bridge, the concentrated solution falls into a sand discharge water tank, and floating overflow sewage with lighter specific gravity is directly discharged into the aeration grit chamber through an overflow liquid pipe; the water outlet pipe of the sand suction pump is connected with the water inlet pipe of the hydraulic cyclone sand remover; the sand discharge water tank is arranged in parallel with the aeration grit chamber and receives the concentrated solution separated by the hydraulic cyclone sand remover; the sand-water separator water inlet pipe is connected with the sand discharge water tank.

The invention has the following beneficial technical effects:

the invention provides a hydraulic cyclone desanding pretreatment type aeration grit chamber desanding system which has the advantages that mixed liquid is pre-separated under the combined action of a hydraulic cyclone desander by means of the power of a sand pump, the mixed liquid of sand water with a large specific gravity of more than or equal to 0.1mm and the mixed liquid of sewage and organic matters with a light specific gravity are pre-separated, one part of sewage containing micro-fine sand directly returns to the aeration grit chamber through an overflow liquid pipe of the hydraulic cyclone desander, the other part of concentrated mixed liquid containing large particles enters a sand discharge water tank through an underflow sewage outlet at the bottom of the hydraulic cyclone desander and then flows into a water inlet of the sand separator, and the impact of the flow and the flow speed of the mixed liquid in a water flowing tank on sand water separation is reduced. Because the inclined plate sedimentation device and the plane water distribution weir groove are arranged in the subsequent sand-water separator, the separation efficiency of the sand-water separator is further improved, and the sand content of sewage at the discharge outlet of the sand-water separator is greatly reduced, so that the amount of organic suspended matters separated along with inorganic sand and stone is reduced, and the adverse effects of equipment abrasion, pipeline blockage, pool capacity reduction and the like are reduced; the loss of organic carbon sources in a pretreatment unit is reduced, the proportion of organic suspended matters flowing back to a biochemical system is increased, carbon sources are supplemented, the biochemical treatment process is optimized, the proportion of inorganic matters in sewage is reduced, the proportion of effective biomass in activated sludge is increased, and the water quality safety of effluent of a sewage plant is guaranteed.

Description of the drawings:

the invention will be further described in detail and fully with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a hydraulic cyclone pretreatment type aeration grit chamber desanding system

FIG. 2 is a cross-sectional view of FIG. 1

FIG. 3 is a schematic diagram of a hydrocyclone;

the mark in the attached drawing is 1. a travelling crane sand suction bridge; 2. a hydrocyclone separator; 3. an overflow port; 4. a underflow port; 5. a water outlet pipe of the sand suction pump; 6. a sand discharge water tank; 7. a sand-water separator; 8. an inclined plate sedimentation device area; 9. a plane water distribution weir trough; 10. an aeration grit chamber; 11. a traveling crane traveling device; 12. a steel rail; 13. a water inlet of the hydraulic cyclone desander; 14. a sand suction pump; 15. a sand suction pipe; 16. an aeration pipe; 17. driving a driving speed reducer; 18 concentrating the sand-containing mixed solution; 19. spiraling; 20, discharging a water weir crest; 21. a water outlet; 22. a sand outlet; 23. and (4) an overflow pipe.

The specific implementation mode is as follows:

this patent proposes a water conservancy whirl degritting preliminary treatment formula aeration grit chamber degritting system, in order to make the purpose, technical scheme and the effect of this patent clearer, clear and definite, combines specific embodiment to do further clear, complete explanation to this patent below.

The invention discloses a novel aeration grit chamber desanding system which is characterized in that a hydraulic cyclone desander is used for pumping sand-water mixed liquid to a sand suction pump for concentration pretreatment before the hydraulic cyclone desander participates in the discharge of a sand suction pump of an aeration grit chamber, and then the sand-water mixed liquid is further precipitated, separated from sand and discharged through a modified sand-water separator.

As shown in fig. 1, 2 and 3, the sand discharge water tank 6 of the system is arranged in parallel with a steel rail 12 at the top of the aeration grit chamber 10, the travelling crane sand suction bridge 1 is erected on the steel rail 12 at the top of the wall of the aeration grit chamber 10, and the travelling crane walking device 11 drives the travelling crane sand suction bridge 1 to reciprocate at the top of the aeration grit chamber 10 under the driving of the driving speed reducer 17; the sand suction pump 14 is fixed below the travelling crane sand suction bridge 1 by a hanger and a sand suction pump water outlet pipe 5, a sand suction pipe 15 is installed at a water inlet below the sand suction pump 14, two sand suction pump water outlet pipes 5 are connected in parallel and then connected to a water inlet 13 of the hydraulic cyclone sand remover 2, the hydraulic cyclone sand remover 2 is fixed below a bridge frame of the travelling crane sand suction bridge 1 by a channel steel bracket, so that a bottom flow port 4 is aligned with the central line of a sand discharge water tank 6 of the aeration grit chamber 10, the travelling crane sand suction bridge 1 is always in the central position of the sand discharge water tank 6 when reciprocating on a steel rail 12 at the top of a pool wall, an overflow port 3 of the hydraulic cyclone sand remover 2 is positioned above the bridge floor of the travelling crane sand suction bridge 1, and an overflow liquid is discharged back to the grit chamber 10 by being connected with an overflow pipe 23 and connected and fixed with the bridge frame of the; the bottom flow port 4 at the bottom of the hydrocyclone 2 discharges the pretreated concentrated sand-containing mixed liquor 18 into a sand discharge water tank 6, the sand discharge water tank 6 and the sand separator 7 flow into a water inlet of the sand separator 7 through a connecting pipeline, the concentrated sand-containing mixed liquor 18 uniformly flows into an inclined plate sedimentation device region 8 through a plane water distribution weir notch 9 in a dispersing way, the gravel equal to or more than 0.2mm passes through an inclined plate advection sedimentation region and uniformly sediments at a position of a shaftless spiral 19 at the bottom of a sedimentation water tank of the sand separator 7, the spiral 19 separates gravel from water during rotation and discharges the gravel to a sand outlet 22 to a sand collecting hopper for external transportation, and the sewage after sedimentation and sand removal overflows through a water outlet 20 of the sand separator 7 and then flows back to the aeration grit chamber 10 through a pump by a water outlet 21 of the sand separator 7. The hydraulic cyclone pretreatment type aeration grit chamber desanding system circularly operates according to the process.

The sand removing system of the hydraulic cyclone sand removing pretreatment type aeration grit chamber works, and the effluent of the sand suction pump enters a hydraulic cyclone sand remover. The hydraulic cyclone desander is used for screening gravel when solid particles in fluid flow in the desander in a rotating mode, strong rotating motion is generated after the solid particles enter equipment from a water inlet of the desander in a tangential mode, water with low density rises under the combined action of centrifugal force, centripetal force and fluid drag force due to different sand water densities, and small particulate matters are discharged from an overflow water outlet along with secondary upward whirling flow after rotating to a certain degree and return to an aeration grit chamber; the sand with high density is discharged from a bottom flow port at the bottom of the equipment and flows into a sand discharge water tank; and then enters the sand-water separator for secondary separation, the plane water distribution weir groove and the inclined plate precipitation device are additionally arranged in the sand-water separator, the plane water distribution weir groove is uniformly distributed to reduce the inflow speed, the inclined plate precipitation device prolongs the water flow path, the separation efficiency of the sand-water separator is further improved, and the sand content of the sewage at the discharge port of the sand-water separator is greatly reduced.

The hydraulic cyclone desanding pretreatment type aeration grit chamber desanding system realizes the pre-separation of sand water by means of the power of the sand suction pump, not only fully utilizes energy, but also reduces the water inflow and the flow velocity of the sand water separator, further improves the separation effect of the sand water separator, greatly reduces the sand content of sewage, and lays a solid foundation for the next step of optimizing biochemical treatment process, reducing equipment and pipeline blockage, occupying the tank volume, improving the proportion of activated sludge, ensuring the quality of effluent water and the like.

Claims

1. A hydraulic cyclone pretreatment type aeration grit chamber desanding system is characterized in that a hydraulic cyclone desander is additionally arranged on a sand suction bridge of an aeration grit chamber, mixed liquid is pre-separated under the combined action of the hydraulic cyclone desander by the aid of power of a sand pump, sand-water mixed liquid with a large specific gravity of more than or equal to 0.1mm and sewage and organic matter mixed liquid with a light specific gravity are pre-separated, one part of sewage containing micro-fine sand directly returns to the aeration grit chamber through an overflow liquid pipe of the hydraulic cyclone desander, the other part of concentrated mixed liquid containing large particles enters a sand discharge water tank through a bottom flow drain outlet at the bottom of the hydraulic cyclone desander and then flows into a water inlet of a sand-water separator, and impact of flow and flow velocity of mixed liquid in a water flowing tank on sand-water separation is reduced; the system comprises a sand suction bridge, a hydraulic cyclone desander, a sand suction pump water outlet pipe, a sand discharge trough, a sand water separator, a plane water distribution weir trough and the inclined plate sedimentation device, wherein the sand suction bridge is arranged on a guide rail at the top of the concrete pool wall of the aeration grit chamber, the hydraulic cyclone desander is arranged at the upper part of the sand suction bridge, concentrated solution falls into the sand discharge trough, and floating overflow sewage with lighter specific gravity is directly discharged into the aeration grit chamber through an overflow liquid pipe; the sand suction pump water outlet pipe is connected with the water inlet pipe of the hydraulic cyclone sand remover, the sand discharge water tank is arranged in parallel with the aeration grit chamber and receives the concentrated solution separated by the hydraulic cyclone sand remover, and the water inlet pipe of the sand-water separator is connected with the sand discharge water tank.

2. The system of claim 1, wherein the two sand suction pump outlets are connected in parallel and then connected to the water inlet of the hydrocyclone, the hydrocyclone is fixed below the bridge of the travelling crane sand suction bridge by a channel steel bracket, so that the underflow port is aligned with the central line of the sand discharge channel of the aerated grit chamber, and the travelling crane sand suction bridge is always located at the central position of the sand discharge channel when reciprocating back and forth on the steel rail at the top of the wall of the tank.

3. The hydrocyclone pretreatment type aeration grit chamber desanding system of claim 1,

the overflow port of the hydraulic cyclone desander is positioned above the bridge floor of the travelling crane sand suction bridge, and the overflow liquid is connected with the bridge frame of the travelling crane sand suction bridge through the connection overflow pipe and is fixedly discharged back to the aeration grit chamber.

4. The hydrocyclone pretreatment type aeration grit chamber desanding system of claim 1,

and the pretreated concentrated sand-containing mixed liquid is discharged from a underflow port at the bottom of the hydrocyclone separator, enters a sand discharge water tank, and flows into a water inlet of the sand-water separator through a connecting pipeline between the sand discharge water tank and the sand-water separator.

5. The hydrocyclone pretreatment type aeration grit chamber desanding system of claim 1,

the concentrated sand-containing mixed liquid uniformly disperses in the plane water distribution weir trough and flows into the inclined plate sedimentation device area, the gravel equal-sedimentation sand-water separator with the thickness of more than or equal to 0.2mm flows through the inclined plate advection sedimentation area and settles at the position of the shaftless spiral at the bottom of the sedimentation water tank, and the spiral separates gravel from water and discharges the gravel to a sand outlet to a sand collection hopper when rotating and waits for outward transportation.

6. The hydrocyclone pretreatment type aeration grit chamber desanding system of claim 1, wherein the hydrocyclone pretreatment type aeration grit chamber desanding system works, and effluent water of a sand suction pump enters a hydrocyclone desander; the hydraulic cyclone desander is used for screening gravel when solid particles in fluid flow in the desander in a rotating mode, strong rotating motion is generated after the solid particles enter equipment from a water inlet of the desander in a tangential mode, water with low density rises under the combined action of centrifugal force, centripetal force and fluid drag force due to different sand water densities, and small particulate matters are discharged from an overflow water outlet along with secondary upward whirling flow after rotating to a certain degree and return to an aeration grit chamber; the sand with high density is discharged from a bottom flow port at the bottom of the equipment and flows into a sand discharge water tank; and then enters the sand-water separator for secondary separation, the plane water distribution weir groove and the inclined plate precipitation device are additionally arranged in the sand-water separator, the plane water distribution weir groove is uniformly distributed to reduce the inflow speed, the inclined plate precipitation device prolongs the water flow path, the separation efficiency of the sand-water separator is further improved, and the sand content of the sewage at the discharge port of the sand-water separator is greatly reduced.