CN218841883U

CN218841883U - Heavy metal filtering and precipitating device for fly ash washing liquid

Info

Publication number: CN218841883U
Application number: CN202223095829.3U
Authority: CN
Inventors: 项婉菊; 刘倩; 欧淑华; 钟宇驰
Original assignee: Hangzhou Huihong Environmental Protection Technology Co ltd
Current assignee: Hangzhou Huihong Environmental Protection Technology Co ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-04-11
Anticipated expiration: 2032-11-18

Abstract

The utility model relates to a flying ash treatment technical field especially relates to a flying ash washing liquid heavy metal filters sediment device, the device includes the precipitate portion, the first filter house that communicates with the precipitate portion and the second filter house that communicates first filter house and precipitate portion, the precipitate portion includes the casing and sets up the stirring scraper in the casing, the first filter house includes first filter shell and sets up a plurality of filter plates that cut off flying ash water in the first filter shell, the filtration pore of filter plate reduces along flying ash water outlet direction in proper order, the second filter house includes the second filter shell and sets up the nanofiltration membrane in the second filter shell; the first filtering part and the second filtering part filter clear liquid after the sedimentation of the fly ash washing liquid, so that heavy metals in the fly ash washing liquid are completely separated, and the heavy metal solidification efficiency is obviously improved; the stirring scraper in the settling part can accelerate the settling reaction and can also clean the sediment on the shell, so that the working efficiency is obviously improved; the device occupies a small area, has short working period and high working efficiency.

Description

Heavy metal filtering and precipitating device for fly ash washing liquid

Technical Field

The invention relates to the technical field of fly ash treatment, in particular to a fly ash washing liquid heavy metal filtering and precipitating device.

Background

The fly ash is a powder substance which is generated in the waste incineration process and has light volume and fine particle size, contains solid heavy metal substances such as Cd, cr, cu, ni, pb, zn and the like, and also contains organic carcinogen dioxin, and can affect the ecological environment and the human health if not treated. In the prior art, the fly ash treatment process adopts a mode of landfill after pretreatment of a curing agent, but the mode wastes land resources, and meanwhile, improper treatment can cause heavy metal substances to be dissolved out to harm the environment. In order to solve the above problems in the prior art, fly ash is treated by a fly ash washing and precipitating device and a high-temperature melting treatment mode, wherein the fly ash washing and precipitating device is used for precipitating and separating sludge in fly ash washing liquid, for example, publication No. CN212369634U, discloses a precipitating device for a fly ash washing liquid purifying system, and the device comprises: the device comprises a buffer water distribution area, a pulse water distribution pipe, an air inlet auxiliary pipe, a settling area, an inclined pipe filling area, a sludge discharge pipe and a clear liquid self-flow area, has stable performance and ideal effluent quality, can effectively solve the problem of sludge deposition and dispersion of washing liquid in the process of sedimentation and purification, and can reduce the problem of sludge deposition in a process pipeline.

And as disclosed in publication No. CN212491699U, a sedimentation purification device for treating sewage or wastewater and fly ash washing liquid comprises a water inlet area, a sedimentation area, a water outlet area and a sludge area, wherein water is fed in and out by adopting baffling, a turbulent flow distributor is used for water replenishing, the sedimentation area is arranged in sections, and the sludge area is arranged in sections, so that the water flow path and the retention time can be increased, the sludge can be more effectively sedimentated, different sludge discharge time intervals are set according to different sludge sedimentation rates and sedimentation amounts in each section, and the problems of local sedimentation, hardening and the like of the sludge can be effectively avoided.

The fly ash washing liquid precipitation treatment device in the prior art has the following problems: the sedimentation device among the prior art is mostly the sedimentation tank, and the area of this kind of device is great, and only adopts the mode of sediment to carry out solid-liquid separation to the mud in the fly ash washing liquid, needs carry out long-time the sediment of stewing in its use, and the blowdown is washed, and duty cycle is longer, and work efficiency is low.

Disclosure of Invention

In order to overcome flying dust washing liquid among the prior art and deposit processing apparatus and have work efficiency low, long operating cycle, use the big problem of area, the application provides a flying dust washing liquid heavy metal filters sediment device, the device is by the precipitate portion, first filter house and second filter house constitute, wherein the filter plate through the different filtration pores of a plurality of first filter house carries out the stage filtration to flying dust water and gets rid of large granule material, the second filter house is through receiving the material separation of straining remaining tiny granule, stirring scraper in the precipitate portion is with flying dust aquatic heavy metal, organic matter etc. deposit, stirring can the accelerated reaction when flying dust water adds the medicine and deposits, the sediment of attaching to on the shells inner wall can be cleared up to the scraper blade, can clear up the precipitate portion in the medicine stirring process, the device takes up an area of for a short time, high work efficiency, can separate the heavy metal in the flying dust aquatic completely.

The specific technical scheme of the invention is as follows:

the utility model provides a flying dust washing liquid heavy metal filters sediment device, includes the second filter house of settling part, first filter house and intercommunication first filter house and settling part with the settling part intercommunication, the settling part includes the casing and sets up the stirring in the casing and scrapes the piece, first filter house includes first filtration shell and sets up a plurality of the filter plates that cut off and fly grey water in first filtration shell, the filtration pore of filter plate reduces along flying dust water play water direction in proper order, the second filter house includes that the second filters the shell and sets up the nanofiltration membrane in the second filtration shell.

The application provides a heavy metal filtering and precipitating device for fly ash washing liquid, which comprises a precipitation part, a first filtering part and a second filtering part, wherein the precipitation part comprises a shell and a stirring scraper, the shell is a reaction container for adding medicine into the fly ash washing liquid, the fly ash washing liquid is injected into the shell during operation, then the medicine is added to start reaction, the stirring scraper can play a role in stirring and accelerating the reaction so as to accelerate the precipitation reaction of the fly ash washing liquid, meanwhile, the stirring scraper can scrape out the precipitate attached to the inner wall of the shell during stirring, the precipitation part can be cleaned during reaction, and the working efficiency is obviously improved; the first filtering part is provided with a plurality of filter plates for intercepting the water washing liquid of the fly ash, the filter plates sequentially reduce the aperture of filter holes along the water outlet direction of the water washing liquid of the fly ash, when the filter plate works, after the precipitation and stratification of the precipitation part are finished, the upper layer of clear liquid is conveyed into the first filtering part, the filter plates in the first filtering part can separate large-particle solid matters in the liquid, the combination of the plurality of filter plates with different apertures can solve the problem that a single filter plate blocks the aperture when in use and has low filtering efficiency, the filtering efficiency is higher in the grading filtering process, and the single filter plate in the combined filter plate can be detached, maintained and replaced after being blocked without influencing the work of other filter plates, so that the continuity of the work of the device can be ensured; the second filtering part is internally provided with a nanofiltration membrane, the liquid filtered by the first filtering part is conveyed into the second filtering part in the using process, the nanofiltration membrane can carry out secondary filtration on the clear liquid filtered by the first filtering part, the heavy metal small particles in the clear liquid can be completely separated after filtration, the heavy metals in the fly ash water washing liquid can be separated, and the solidification efficiency of the heavy metals in the fly ash water washing liquid is improved; the clear liquid that the device separated can be used for carrying out the back flush to the device, has improved waste water reuse efficiency, and the device overall structure compares with the sedimentation tank structure that take up an area of for a short time, and work efficiency is high, and the practicality is stronger.

Preferably, the aperture of the filter plate is 5 to 20mm.

Preferably, the filter plate comprises a filter end and a fixed end which are detachably connected with the first filter shell, the fixed end is rectangular, and the fixed end is detachably connected with the first filter shell; the fixed end of the filter plate is detachably connected with the first filter shell, so that the filter plate is convenient to detach and mount.

Preferably, the stirring scraper comprises a motor, a rotating shaft arranged on the motor, a stirring paddle and a scraper blade, the stirring paddle and the scraper blade are arranged on the rotating shaft, the scraper blade rotates around the rotating shaft, and one end of the scraper blade, which is close to the shell of the settling part, is matched with the inner surface of the shell;

preferably, the paddle of the stirring paddle is in a screw thread shape.

Preferably, the first filter shell is provided with a first water inlet, a first water outlet, a buckle, a base detachably connected with the filter plate and a cover plate covering the filter plate, and the buckle is detachably connected with the cover plate; the base and the cover plate play a limiting role in the filter plate, the filter plate can be fixed, the buckle plays a limiting role in the cover plate, the cover plate limits the longitudinal movement of the filter plate, and the base limits the transverse movement of the filter plate.

Preferably, the second filter shell is provided with a second water outlet, a concentrated solution water outlet, a backwashing water inlet, a backwashing water outlet and a second water inlet.

Preferably, the shell is provided with a shell liquid inlet, a medicine adding port, a sediment outlet and a shell liquid outlet.

Preferably, a lift pump is communicated between the first water outlet and the second water inlet.

Preferably, a lift pump is communicated between the shell liquid outlet and the first water inlet.

Compared with the prior art, the method has the following technical effects:

(1) The first filtering part and the second filtering part filter clear liquid obtained after the sedimentation of the fly ash washing liquid, so that heavy metals in the fly ash washing liquid are completely separated, and the heavy metal solidification efficiency of the fly ash washing liquid is obviously improved;

(2) According to the device, the stirring scraper in the settling part can accelerate the reaction of the fly ash washing liquid, and the sediment on the settling part is cleaned while stirring, so that the working efficiency is high;

(3) The device occupies a small area compared with sedimentation tanks, and has short working period and high working efficiency.

Drawings

Fig. 1 is a schematic structural diagram of the present application.

FIG. 2 is a schematic view of a first filter portion of the present application

FIG. 3 is a schematic view of a second filter portion of the present application

Fig. 4 is a schematic structural view of the filter plate of the present application.

In the figure, the precipitation part 1, the casing 101, the casing liquid inlet 111, the chemical feeding port 112, the precipitation outlet 113, the casing liquid outlet 114, the stirring scraper 102, the motor 121, the rotating shaft 122, the stirring paddle 123, the scraper 124, the first filtering part 2, the first filtering shell 201, the first water inlet 211, the first water outlet 212, the buckle 213, the base 214, the cover plate 215, the filtering plate 202, the filtering end 221, the fixed end 222, the second filtering part 3, the second filtering shell 301, the nanofiltration membrane 302, the second water outlet 311, the concentrate water outlet 312, the backwash water inlet 313, the backwash water outlet 314, the second water inlet 315, the nanofiltration membrane 302, the second lift pump 4, and the first lift pump 5.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1:

as shown in fig. 1, a heavy metal filtering and precipitating device for fly ash washing liquid comprises a precipitating part 1, a first filtering part 2 communicated with the precipitating part, and a second filtering part 3 communicated with the first filtering part and the precipitating part, wherein the precipitating part comprises a shell 101 and a stirring scraper 102 arranged in the shell, the stirring scraper comprises a motor 121, a rotating shaft 122 arranged on the motor, and a stirring paddle 123 and a scraper 124 arranged on the rotating shaft, the scrapers rotate around the rotating shaft, are long strips made of metal and are respectively arranged on two sides of the rotating shaft, and are provided with a plurality of 5mm round holes; the shell is provided with a shell liquid inlet 111, a medicine adding port 112, a precipitation outlet 113 and a shell liquid outlet 114; the paddle of the stirring paddle is in a thread shape, and the stirring paddle is spirally arranged around the rotating shaft as the center.

As shown in fig. 2, the first filtering portion includes a

first filter casing

201 and 5 filter plates 202 disposed in the first filter casing for intercepting fly ash water, the filter holes of the filter plates decrease in sequence along the direction of the outlet of the fly ash water, and the aperture of each filter plate is 5mm,10mm,13mm,16mm and 20mm; the first filter shell is provided with a first water inlet 211, a first water outlet 212, a buckle 213, a base 214 detachably connected with the filter plate and a cover plate 215 covered on the filter plate, the filter plate comprises a filter end 221 and a fixed end 222 detachably connected with the first filter shell, the fixed end is rectangular, the filter end is circular, the fixed end is detachably connected with the cover plate, and the buckle is detachably connected with the cover plate.

As shown in fig. 3, the second filtering portion includes a second filtering shell 301 and a nanofiltration membrane 302 disposed in the second filtering shell, the second filtering shell is provided with a second water outlet 311, a concentrate water outlet 312, a backwash water inlet 313, a backwash water outlet 314, and a second water inlet 315, and the shell is provided with a shell liquid inlet 111, a dosing port 112, a precipitation outlet 113, and a shell liquid outlet 114; a second lifting pump 4 is communicated between the shell liquid outlet and the first water inlet, and a first lifting pump 5 is communicated between the first water outlet and the second water inlet.

The implementation steps of the device are as follows:

closing the partition switch, allowing the fly ash washing liquid to enter the shell through the water inlet of the shell, injecting a metal chelating agent into the fly ash washing liquid through the medicine adding port, starting the stirring scraper, driving the stirring paddle and the metal scraper to rotate by the motor, fully and uniformly mixing, reacting for 30min, and standing for 20min after stirring; treat the deposit room reaction after complete, open the cut-off switch, through first elevator pump, carry the supernatant in the casing to first filter house, filter plate in the first filter house is with the large granule heavy metal precipitation in the supernatant to get off, the supernatant after the filtration enters into the second filter house through the second elevator pump, the filter membrane in the second filter house separates the tiny particle heavy metal granule in with the supernatant, the liquid that does not contain heavy metal enters into the flying dust washing liquid import of casing through the second delivery port and is used for washing shells inner wall, the precipitation that first filter house and second filter house held off and heavy metal ion and the interior precipitation of casing mix the back entering subsequent processing. And after the filtration is finished, opening the buckle, moving out the cover plate, moving out the metal filter plate, washing the first filter part by using the filtered clear water without heavy metal, flushing the second filter part at constant pressure by introducing the clear water from the back-flushing water inlet, and enabling the back-flushing liquid after flushing to flow out from the back-flushing water outlet.

Claims

1. The utility model provides a flying dust washing liquid heavy metal filters sediment device, characterized by, including precipitation portion (1), first filter house (2) and second filter house (3) of intercommunication first filter house and precipitation portion with the precipitation portion intercommunication, the precipitation portion includes casing (101) and sets up stirring scraper (102) in the casing, first filter house includes first filter shell (201) and sets up a plurality of filter plates (202) that fly grey water that dams in first filter shell, the filtration pore of filter plate reduces along flying dust water play water direction in proper order, the second filter house includes that the second filters shell (301) and sets up nanofiltration membrane (302) in the second filter shell.

2. The heavy metal filtering and precipitating device for the fly ash washing liquid as claimed in claim 1, wherein the aperture of the filter plate is 5 to 20mm.

3. The heavy metal filtering and precipitating device for the fly ash washing liquid as claimed in claim 1 or 2, wherein the filter plate comprises a filter end (221) and a fixed end (222), the filter end and the fixed end are detachably connected with the first filter shell, the fixed end is rectangular, and the fixed end and the first filter shell are detachably connected.

4. The heavy metal filtering and precipitating device for the fly ash washing liquid as claimed in claim 1, wherein the stirring scraper comprises a motor (121), a rotating shaft (122) arranged on the motor, and a stirring paddle (123) and a scraper (124) arranged on the rotating shaft, the scraper rotates around the rotating shaft, and one end of the scraper close to the shell of the precipitation part is matched with the inner surface of the shell.

5. The heavy metal filtering and precipitating device for the fly ash washing liquid as claimed in claim 4, wherein the blades of the stirring paddle are threaded.

6. The heavy metal filtering and precipitating device for the fly ash washing liquid according to claim 1, wherein the first filter shell is provided with a first water inlet (211), a first water outlet (212), a buckle (213), a base (214) detachably connected with the filter plate, and a cover plate (215) covering the filter plate, and the buckle is detachably connected with the cover plate; and a second water outlet (311), a concentrated solution water outlet (312), a backwashing water inlet (313), a backwashing water outlet (314) and a second water inlet (315) are formed in the second filter shell.

7. The heavy metal filtering and precipitating device for the fly ash washing liquid as claimed in claim 1, wherein the housing is provided with a housing liquid inlet (111), a dosing port (112), a precipitation outlet (113) and a housing liquid outlet (114).

8. The fly ash washing liquid heavy metal filtering and precipitating device of claim 6, wherein a lift pump is communicated between the first water outlet and the second water inlet.

9. The heavy metal filtering and precipitating device for the fly ash washing liquid as claimed in claim 6, wherein a lift pump is communicated between the liquid outlet of the housing and the first water inlet.