CN108970239B

CN108970239B - Rainwater filtering and purifying device and filtering method

Info

Publication number: CN108970239B
Application number: CN201810946228.8A
Authority: CN
Inventors: 吕学斌; 韩怡雯; 叶磊
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2020-04-24
Anticipated expiration: 2038-08-20
Also published as: CN108970239A

Abstract

The invention relates to a rainwater filtration and purification device and a filtering method. The purification device is at least composed of a buoy coarse filter screen, a suspended partition wall, a sludge collection tank, a sludge collection net, a sludge discharge pipe and a fine iron wire filter screen; Set between the water inlet and the suspended partition. During precipitation, the rainwater enters the rainwater filtration and purification device through the water inlet pipe. When the water level rises, the buoys on both sides of the buoy coarse filter float to drive the entire buoy coarse filter to rotate from a vertical state to a horizontal state, and the inflowing water is filtered for the first time. ; The water after preliminary filtration passes through the fine wire filter set at the mouth of the drain pipe to obtain secondary filtration; when the precipitation process is completed, the water level in the device drops, the buoy coarse filter returns to a vertical state, and large particles and plastic floating objects are on it. With the remaining water flow into the collection device in the sludge collection tank, the remaining sewage in the entire device is discharged from the bottom sludge discharge pipe. The invention increases the filtration speed, improves the purification efficiency, is convenient to operate and reduces the cost.

Description

Rainwater filtering and purifying device and filtering method

Technical Field

The invention belongs to the technical field of rainwater utilization and water supply and drainage, and particularly relates to a rainwater filtering and purifying device and a filtering method.

Background

At present, China faces the problem of serious shortage of water resources, and the purification of sewage, particularly the secondary utilization of rainwater, is an important link for energy conservation and environmental protection. Every time precipitation occurs, the rainwater pipe network in the city has huge pressure, so that rainwater is timely drained, the water is preliminarily purified through a physical process in a drainage process to improve the water quality, and the urban rainfall flood management system mainly collecting and utilizing rainwater is continuously perfected. The rainwater is collected mainly from roof rainwater and road surface rainwater, but the water quality is poor. At the present stage, the rainwater collection and utilization facilities are provided with an initial rainwater discarding facility and a rainwater collection facility provided with a filtering system, the construction is complex, the investment cost is high, and the filtering process is easy to block and difficult to clean. Published patent CN204898776U,2015-12-23 a rainwater filtering and accumulating device mentions rainwater filtering, but has the following problems: 1. the filter sheet (14) structure is composed of two layers of iron wire nets and a layer of filter membrane, wherein the filter membrane has small pores and is easy to block, in order to ensure the filtering speed, the filter membrane needs to be pressurized on one side of the filter, and under the normal pressure state in the device, the filter membrane slows down the filtering speed, so that excessive water flow is easily accumulated in the device and cannot be normally discharged. 2. The sludge after precipitation is finished is directly discharged by the sludge discharge pipe (10), and the large and small particles are mixed, so that the pipe orifice is easily blocked, and the device cannot normally run. 3. The method for replacing the filter membrane in the filter plate of the device is that the filter plate is integrally taken to the well by manually descending to the underground, the filter membrane clamped in the middle of the wire netting is replaced, and the double-layer wire netting is cleaned, so that the operation difficulty is high and the operation is unsafe. The patent publication CN207016579U,2018-02-16 discloses a rainwater precipitation filtering device, which also has the problems that the filter membrane pores in the filter sheet (11) are small, and the sludge after precipitation is directly discharged from the sludge discharge pipe (6). Therefore, aiming at the problems, a rainwater filtering and purifying device needs to be designed, so that the water flow is ensured to be smooth, a sludge discharge pipe is not blocked in the discharge process of residual sludge and waste water, and safe and convenient devices such as a filter screen cleaning operation can be completed on an artificial well, which is a problem to be solved urgently at present.

Disclosure of Invention

In order to solve the problems in the prior art, the invention relates to a rainwater filtering and purifying device, which is used for collecting and filtering rainwater during rainfall, separately discharging sewage and sludge, ensuring smooth water flow, preventing a sludge discharge pipe from being blocked in the discharging process of residual sludge and wastewater, completing the operation of cleaning a filter screen on a manual well, facilitating the smoothness of urban pipe networks, preventing pipelines from being blocked easily and safely and conveniently.

The invention improves the internal structure of the device on the basis of the prior art, and saves the device form and the suspended partition wall in the device in the prior art; the existing one-time filtration in the device is improved into two-time filtration, large solid particles and small solid particles of the floating objects are separately filtered, and the floating filter has the advantages that the large particles and large-area floating objects are prevented from being attached to a filter screen in the filtering process, a pore channel is blocked, and the filtering speed is increased after the improvement; the fine iron wire filter screen is used for secondary filtration to replace the filter membrane in the filter disc of the prior patent, so that the purification effect is good; this device increases collection that can artifical carry in mud collecting vat and the collecting vat and draw the change and net, can be with most mud gathering in the net, collects the mode of taking out of net and iron wire filter screen and uses the long arm hook for the manual work on the well and carry the net edge, need not personnel and get the net in the pit down, does not block up the mud pipe, and the operation is safe convenient, and after the precipitation process was accomplished, surplus sewage and extremely fine granule were arranged the mud pipe by the bottom and are arranged.

The invention adopts the following technical scheme:

a rainwater filtering and purifying device at least comprises a buoy coarse filter screen, a suspended partition wall, a sludge collecting tank, a sludge collecting net, a sludge discharge pipe and a fine iron wire filter screen; the buoy coarse filter screen is arranged between the water inlet and the suspended partition wall.

The buoy coarse filter screen is composed of a single-layer wire mesh and two symmetrical buoys.

The sludge collecting tank is characterized in that a collecting net which is manually lifted is laid in the tank, the collecting net is made of wire netting with small holes, the attaching tank wall is laid, one surface which receives sludge inflow is free of net, and the other five surfaces are formed by wire netting with small holes and are rectangular collecting containers.

The mud is collected the net and is had horizontal distance with unsettled compartment, when lifting and drawing and putting back the mud on the well and collecting the net, all can not blockked by unsettled partition wall.

The iron wire filter screen is used for filtering water entering the water outlet pipe again, solid impurities flow into the bottom sludge collector along water flow after precipitation is finished, a long arm hook is used on the well during cleaning and hooks the fine iron wire filter screen to lift upwards, and after cleaning is finished, the fine iron wire screen is placed back into the corresponding clamping groove and the corresponding mounting seat in the same way; realizing movable cleaning and installation.

When the device is used for rainwater filtration and purification, rainwater enters the rainwater filtration and purification device through the water inlet pipe during rainfall, and the energy of the water flow is weakened and flows to the bottom of the device under the blocking effect of the suspended partition wall; when the water level rises, the buoys on the two sides of the buoy coarse filter screen float to drive the whole buoy coarse filter screen to rotate from a vertical state to a horizontal state, and inflow water is primarily filtered to remove large particles and plastic floaters; the water after primary filtration passes through a fine iron wire filter screen arranged at the mouth of the drain pipe to obtain secondary filtration, and after small particles are removed, the water is discharged through the drain pipe; when the precipitation process is completed, the water level in the device is reduced, the buoy coarse filter screen is recovered to be in a vertical state, large particles and plastic floaters on the buoy coarse filter screen flow into a collecting device in the sludge collecting tank along with residual water flow, small particles at the position of a water discharge pipe orifice flow into the collecting device in the sludge collecting tank along with the residual water flow, and residual sewage in the whole device is discharged from a bottom sludge discharge pipe.

Compared with the prior art, the rainwater filtering device has the advantages that rainwater is filtered for the second time in the device, large solid particles and small solid particles of floating objects are filtered separately, and compared with the existing primary filtering, the rainwater filtering device has the advantages that large particles and large floating objects are prevented from being attached to a filter screen in the filtering process, and pore channels are prevented. Therefore, the filtering speed is increased, and the purification efficiency is improved. And the solid waste is concentrated in the device, can be manually cleaned, is convenient to operate and reduces the cost.

Drawings

FIG. 1: the device is schematically shown in the figure, when the device is not in a precipitation process, the buoy filter screen 5 is in a vertical state;

FIG. 2: the device is shown in a schematic diagram, when the water falls, the buoy filter screen 5 is in a horizontal state;

wherein: 1. the sewage treatment system comprises a ground, a well cover 2, a water inlet pipe 3, a buoy 4, a buoy coarse filter screen 5, a suspended partition wall 6, a water inlet area 7, a sludge discharge pipe 8, a sludge collection tank 9, a mounting seat 10, a water discharge pipe 11, a clamping groove 12, a fine iron wire filter screen 13, a filtering and settling area 14, and a sludge collection screen 15

Detailed Description

The invention is further illustrated by the following figures and examples:

the rainwater filtering and purifying device shown in the figures 1 and 2 comprises a ground (1), a well cover (2), a water inlet pipe (3), a buoy (4), a buoy coarse filtering net (5), a suspended partition wall (6), a water inlet area (7), a sludge discharge pipe (8), a sludge collecting tank (9), a mounting seat (10), a water discharge pipe (11), a clamping groove (12), a fine iron wire filtering net (13), a filtering and settling area (14) and a sludge collecting net (15); the buoy coarse filter screen (5) is arranged between the water inlet pipe (3) and the suspended partition wall (6). The buoy coarse filter screen consists of a single-layer wire netting and two symmetrical buoys (4); the device is connected below a well cover (2) on the ground (1), during precipitation, rainwater enters the rainwater filtering and purifying device through the water inlet pipe (3), and under the blocking effect of the suspended partition wall (6), the water flow energy is weakened and flows to the bottom of the device. When the water level rises, the buoys (4) on the two sides of the buoy coarse filter screen (5) float to drive the whole buoy coarse filter screen to rotate from a vertical state to a horizontal state, the inflowing water is primarily filtered, and large particles, plastic floaters and the like are removed. The water flow after primary filtration passes through a water inlet area (7) and a filtration and precipitation area (14) and passes through a fine iron wire filter screen (13) arranged at the pipe orifice of a drain pipe to obtain secondary filtration, and after small particles are removed, the water flow is discharged by the drain pipe (11), wherein the fine iron wire filter screen is fixed by a mounting seat (10) and a clamping groove (12); when the precipitation process is finished, the water level in the device is reduced, the buoy coarse filter screen is recovered to be in a vertical state, large particles and plastic floaters on the buoy coarse filter screen flow into the sludge collection net (15) in the sludge collection tank (9) under the back flushing action along with the residual water flow, small particles at the pipe orifice of the water discharge pipe flow into the sludge collection net in the sludge collection tank under the back flushing action along with the residual water flow, and residual sewage in the whole device is discharged from the bottom sludge discharge pipe (8). And (5) finishing the dewatering process, and cleaning a sludge collection net: mud and solid waste collect in the net, and the collection net edge is hooked to the available two long arm hooks of aboveground, and to the lifting, will collect the whole clearance of taking out of net, the clearance finishes, with the same mode, will collect the net and put back in the mud collecting vat. The sludge collecting net is horizontally separated from the suspended partition, and the sludge collecting net cannot be blocked by the suspended partition when being lifted and put back on the well; cleaning a fine iron wire net (13) in front of a water outlet pipe: and a long arm hook is used on the well to hook the thin iron wire filter screen to lift upwards, and after the cleaning is finished, the thin iron wire filter screen is placed back into the corresponding clamping groove and the corresponding mounting seat in the same way. Therefore, the sludge collecting net and the filter screen at the front part of the water outlet pipe can be manually lifted, pulled, disassembled and cleaned on the well.

Compared with the prior art, the invention has the advantages that the rainwater is subjected to secondary filtration in the device, large solid particles and small solid particles of floating objects are separately filtered, no filter membrane is used, pressurization is not needed, the smoothness of the water flow of an underground pipe network can be ensured on the premise of effective filtration, the filtration speed is increased, and the purification efficiency is improved. After precipitation is completed, under the back-flushing action of residual rainwater in the device, the filter screen is cleaned, solid waste is concentrated in the device, and the filter screen and the collecting screen can be lifted and cleaned up in a well manually, so that the operation is convenient and safe, and the cost is reduced.

Claims

1. A method for filtering and purifying rainwater is characterized in that during rainfall, rainwater enters a rainwater filtering and purifying device through a water inlet pipe, and under the blocking action of a suspended partition wall, the energy of the rainwater is weakened and flows to the bottom of the device; when the water level rises, the buoys on the two sides of the buoy coarse filter screen float to drive the whole buoy coarse filter screen to rotate from a vertical state to a horizontal state, and inflow water is primarily filtered to remove large particles and plastic floaters; the water after primary filtration passes through a fine iron wire filter screen arranged at the mouth of the drain pipe to obtain secondary filtration, and after small particles are removed, the water is discharged through the drain pipe; when the precipitation process is completed, the water level in the device is lowered, the buoy coarse filter screen is restored to a vertical state, large particles and plastic floaters on the buoy coarse filter screen flow into a sludge collecting tank positioned at the bottom of the device along with the residual water flow through the sludge collecting net in the tank, solid wastes at the position of a water discharge pipe opening also flow into the sludge collecting tank along with the residual water flow, and residual sewage in the whole device is discharged from a bottom sludge discharge pipe.