CN113441378A - Powdery activated carbon pre-coating membrane device for ultrafiltration pretreatment, pretreatment device and method - Google Patents
Powdery activated carbon pre-coating membrane device for ultrafiltration pretreatment, pretreatment device and method Download PDFInfo
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- CN113441378A CN113441378A CN202110816009.XA CN202110816009A CN113441378A CN 113441378 A CN113441378 A CN 113441378A CN 202110816009 A CN202110816009 A CN 202110816009A CN 113441378 A CN113441378 A CN 113441378A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 238000000576 coating method Methods 0.000 title claims abstract description 68
- 239000011248 coating agent Substances 0.000 title claims abstract description 67
- 239000012528 membrane Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000000108 ultra-filtration Methods 0.000 title claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000004744 fabric Substances 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 238000009501 film coating Methods 0.000 claims abstract description 15
- 239000007888 film coating Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000008213 purified water Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 15
- 239000003344 environmental pollutant Substances 0.000 abstract description 9
- 231100000719 pollutant Toxicity 0.000 abstract description 9
- 230000004907 flux Effects 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000002203 pretreatment Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002189 fluorescence spectrum Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/16—Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Sorption (AREA)
Abstract
A pre-coating device, a pre-treatment device and an operation method for powdered activated carbon; the pre-coating device comprises a cylinder body and cloth bags, wherein two ends of the cylinder body are provided with seal heads, and the cloth bags are arranged in the cylinder body; the pretreatment device comprises a pre-coating film water inlet tank, a water pump and a powdered activated carbon pre-coating film device, wherein a stirring device is arranged in the pre-coating film water inlet tank, the upper part of the pre-coating film water inlet tank is provided with a feed pipe and a circulating return pipe, the circulating return pipe is connected with the powdered activated carbon pre-coating film device through a circulating valve, the bottom of the pre-coating film water inlet tank is connected with a liquid inlet of the powdered activated carbon pre-coating film device through the water pump and a conveying pipe, and a liquid outlet valve is arranged on an output pipe; the operation method comprises two parts of film coating and filtering, wherein the same pre-coated film inlet water tank is used for both film coating and filtering. The invention has flexible installation and simple operation, relieves the accumulation of pollutants on the UF membrane, strengthens the pollutant removal effect of UF, improves the UF operation flux and enhances the cleaning effect of UF.
Description
Technical Field
The invention relates to a powdery activated carbon pre-coating membrane device for ultrafiltration pretreatment and a pretreatment device, belonging to the technical field of town water pollution control and resource utilization.
Background
The urban domestic sewage is complex in component, contains organic pollutants mainly, is accompanied by a large amount of pathogenic microorganisms, and needs to be treated before resource utilization. When the Ultrafiltration (UF) technology is applied to treating tail water of urban sewage treatment plants, particles, colloidal particles or solute macromolecules in the tail water are deposited and adsorbed on the surface of an UF membrane and in membrane pores, so that the membrane pores are blocked, and the water yield is reduced. In addition, irregular particles in tail water continuously collide with the UF membrane, and if the collision is serious, the filaments of the UF membrane are damaged. Under the background, a UF pretreatment method is constructed, the removal of pollutants in tail water of a municipal sewage treatment plant is enhanced, and the important guarantee for maintaining the stable operation of an UF system is provided.
The powdered activated carbon pre-coated membrane (PACPM) is a porous base membrane, and PAC suspension is filtered to form a PAC filter cake layer with a certain thickness on the base membrane. The PACPM can remove small molecular organic matters in the tail water of urban sewage treatment plants through PAC adsorption, can retain particles with larger particle sizes, and relieve the enrichment of pollutants on UF membranes, but the problems of UF membrane damage, backwash difficulty increase and the like easily caused by PAC coating directly on the UF membranes.
Therefore, a PACPM device which is flexible in installation, simple in operation, and capable of enhancing pollutant removal and relieving pollutant accumulation on the UF membrane is urgently needed.
Description of terms:
CEB: chemical enhanced backwashing (chemical enhanced backwashing)
TMP: transmembrane pressure difference (transmembrane pressure)
TOC: total organic carbon (total organic carbon)
DOC: soluble organic carbon (dissolved organic carbon)
UF: ultrafiltration (ultrafiltration)
And SS: suspended matter (suspended solids)
SF: specific flux (specific flux)
EX: excitation wavelength (excitation wavelength)
EM: emission wavelength (emision wavelength)
PAC: powdered Activated Carbon (PAC)
PACPM: powdered activated carbon precoat-coated membrane (PACPM)
Disclosure of Invention
Aiming at the defects of the prior ultrafiltration technology, the invention provides a powdered activated carbon pre-coating membrane device for ultrafiltration pretreatment, which has the advantages of enhanced pollutant removal effect, high UF operation stable flux and good UF cleaning effect, and also provides an ultrafiltration pretreatment device using the device and an operation method of the pretreatment device.
The technical scheme of the ultrafiltration pretreatment powder activated carbon pre-coating membrane device is as follows:
the device comprises a barrel and a cloth bag, wherein a liquid inlet is formed in the lower end of the barrel, a liquid outlet is formed in the upper end of the barrel, the cloth bag is arranged in the barrel, the upper end of the cloth bag is open and is connected with the inner wall of the barrel, and the lower end of the cloth bag is closed.
The cloth bag is sleeved on the supporting net cylinder, and the upper end of the supporting net cylinder is opened and is sealed with the inner wall of the cylinder body. The inner diameter of the supporting net cylinder is 0.14-0.16 m.
The cloth bag is a polytetrafluoroethylene filter bag with a filter area of 0.5m2Flow rate of 0-40m3·m-2The filtration precision is 25 μm.
Adopt above-mentioned ultrafiltration preprocessing device (PACPM preprocessing device) of membrane device of precoating, except that the membrane device is precoated to powdered activated carbon, still including the membrane intake water tank of precoating, set up agitating unit in the membrane intake water tank of precoating, the upper portion of membrane intake water tank of precoating is provided with inlet pipe and circulation back flow, be provided with the feed valve on the inlet pipe, the liquid outlet of membrane device is precoated to the powdered activated carbon through the circulating valve connection to the circulation back flow, the membrane device inlet is precoated to the bottom of membrane intake water tank of precoating through water pump and duct junction powdered activated carbon, the membrane device liquid outlet of precoating of powdered activated carbon passes through output tube connection ultrafiltration water purification tank, be provided with out the liquid valve on the output tube.
The operation method of the pretreatment device comprises two parts of coating and filtering, wherein the same pre-coated water inlet tank is used for both coating and filtering, and the method comprises the following specific steps:
(1) coating PACPM:
opening a circulating valve, closing a liquid outlet valve, and performing a film coating process; adding powdered activated carbon into a pre-coating film water inlet tank, mixing the powdered activated carbon and Ultrafiltration (UF) effluent in a pretreatment water inlet tank to prepare an activated carbon suspension, uniformly stirring and mixing, and continuously circulating between a powdered activated carbon pre-coating film device and the pre-coating film water inlet tank through a water pump until the film coating is finished.
The powdered activated carbon is coal powdered activated carbon with the average particle size ranging from 30.07 mu m to 33.42 mu m.
The powder activated carbon pre-coating film device adopts a bottom water inlet mode.
The concentration of the activated carbon suspension is 1 g.L-1。
The finishing of the coating refers to that the suspended particles SS of effluent after the coating circulation are 5 mg.L-1The following.
(2) And (3) filtering PACPM:
and after the film coating is finished, closing the circulating valve, opening the feed valve and the liquid outlet valve, pumping the outlet water subjected to the three-stage treatment in the sewage treatment plant into a pre-coating film inlet water tank, and opening the water pump to filter the outlet water by using a powder activated carbon pre-coating film device.
The inlet water flow rate of the PACPM filter is 2-3m3·h-1The pressure is below 0.08 MPa.
The invention has flexible installation and simple operation, relieves the accumulation of pollutants on the UF membrane, strengthens the pollutant removal effect of UF, improves the UF operation flux, strengthens the cleaning effect of UF, and provides technical support for the construction of a stable and efficient double-membrane system for advanced treatment of town sewage and the optimization regulation and control of the system. Has the following characteristics:
1. the powdered activated carbon is used as a coating material, so that the raw material source is wide, the secondary pollution is avoided, the steps are simple, and the operation is easy.
2. The ultrafiltration pretreatment is realized by coating the powdered activated carbon on the base membrane, so that the ultrafiltration inflow water quality can be directly improved, macromolecule organic matters and micromolecule organic matters are respectively intercepted and adsorbed to be removed, and the stable operation of an ultrafiltration system can be effectively guaranteed.
3. Compared with the traditional activated carbon pool, the device has the advantages of small occupied area, low one-time investment cost, realization of modularization of the treatment device and convenience for industrial popularization and application.
Description of the drawings:
FIG. 1 is a schematic view showing the construction of a PACPM device according to the present invention.
FIG. 2 is a schematic view showing the construction of a PACPM pretreatment apparatus according to the present invention.
FIG. 3 is a process flow diagram of a PACPM pretreatment apparatus according to the present invention.
FIG. 4 is a graph showing the change in water SS concentration during the pretreatment coating process of PACPM according to the present invention.
FIG. 5 is a graph showing the effect of organic treatment in the example of the present invention.
FIG. 6 is a graph showing the effect of organic molecular weight treatment in the example of the present invention.
FIG. 7 is a graph showing the effect of treating hydrophilic and hydrophobic organic substances in the example of the present invention.
FIG. 8 is a three-dimensional fluorescence spectrum analysis diagram in an example of the present invention.
FIG. 9 is a graph showing the effect of the fluorescence intensity processing on each region of organic substances in the example of the present invention.
FIG. 10 is a graph showing the effect of organic treatment with diatomaceous earth in comparative examples of the present invention.
In the figure: 1. the device comprises an upper end sealing head, 2. a cloth bag, 3. a barrel, 4. a supporting net barrel, 5. a lower end sealing head, 6. a liquid outlet, 7. a liquid inlet and 8. a blocking cover;
9. the system comprises a seal head, 10 parts of a blowdown valve, 11 parts of a circulating valve, 12 parts of a liquid outlet valve, 13 parts of a feed pipe, 14 parts of a delivery pipe, 15 parts of an output pipe, 16 parts of a circulating return pipe, 17 parts of a blowdown pipe and 18 parts of an ultra-filtration purified water tank. 19. Precoating membrane water inlet tank, 20. high pressure water pump, 21.PACPM device, 22. feed valve.
Detailed Description
The powdery activated carbon pre-coating membrane device for ultrafiltration pretreatment comprises an end enclosure 1, a cylinder 3 and a cloth bag 2, wherein the end enclosures are arranged at two ends of the cylinder 3, a liquid inlet 7 is arranged on a lower end enclosure 5, a liquid outlet 6 is arranged on an upper end enclosure 1, a supporting net cylinder 4 is arranged in the cylinder 3 and is fixedly connected to the inner wall of the cylinder 3 through a blocking cover 8, and the cloth bag 2 is arranged on the supporting net cylinder 4, as shown in figure 1. The supporting net cylinder 4 is processed into a cylinder by using a stainless steel net, the inner diameter is 0.14-0.16m, and the upper end is open. The upper end of the cloth bag 2 is open, the lower end is sealed, the cloth bag is sleeved on the supporting net barrel 4, and a gap with a certain width is formed between the cloth bag 2 and the inner wall of the barrel body 3. Liquid enters from the liquid inlet 7, enters the cloth bag 2 from a gap between the cloth bag 2 and the cylinder body 3, and is discharged from an opening at the upper end of the supporting net cylinder 4. The function of the blocking cover 8 is to prevent the liquid from being directly discharged from the gap between the cloth bag 2 and the cylinder 3, which causes short flow.
Each part is made of transparent organic glass, and the coating effect and the filtering state of PAC on the cloth bag 2 can be clearly observed. The cylinder 3 is connected with the upper end seal head 1 and the lower end seal head 5 through flanges, and the joints are rubber seal rings to prevent the device from leaking water. The cylinder 3 is arranged perpendicular to the ground, and in order to ensure that PAC forms a compact pre-coating film on the cloth bag 2, the inner diameter of the cloth bag 2 is designed to be 0.22m, the height is 1.04m, and the filtering area is designed to be 0.5m2. The cloth bag 2 is a PTFE filter bag with a length of 810mm, a diameter of 180mm and a filter area of 0.5m2Flow rate range of 0-40m3·m-2The filtration precision is 25 μm. The outer side of the cloth bag 2 is filtered, the liquid is fed into the lower end of the cloth bag, and the liquid is discharged from the upper part of the cloth bag.
A pretreatment device (PACPM pretreatment device) of a powder activated carbon pre-coating film adopts the powder activated carbon pre-coating film device (PACPM device 7), as shown in figure 2, and further comprises a pre-coating film water inlet tank 19 and a high-pressure water pump 20. The precoating film inlet water tank 19 is internally provided with a stirring device. The upper part of the precoating film water inlet tank 19 is provided with a feed pipe 13 and a circulating return pipe 16, the feed pipe 13 is provided with a feed valve 22, and the circulating return pipe 16 is connected with a liquid outlet 6 of a PACPM device 21 through a circulating valve 11. The bottom of the pre-coated film water inlet tank 19 is connected with a liquid inlet 7 of a PACPM device 21 through a high-pressure water pump 20 and a conveying pipe 14. The liquid outlet 6 of the PACPM device 21 is connected with an ultrafiltration purified water tank 18 through an output pipe 15, and a liquid outlet valve 12 is arranged on the output pipe 15. The bottom of the PACPM device 7 is provided with a blow-off pipe 17, and the blow-off pipe 17 is provided with a blow-off valve 10.
The operation of the pretreatment device is divided into a film coating process and a filtering process, wherein the same pre-coating film inlet water tank 5 is used for both film coating and filtering, and the specific steps are as follows, referring to fig. 2 and 3.
(1) Coating PACPM:
the circulating valve 11 (film coating valve) is opened, the liquid outlet valve 12 (filter valve) is closed, and the film coating process is carried out. Selecting coal Powdered Activated Carbon (PAC) with average particle size of 30.07-33.42 μm, adding into pre-coated inlet water tank 1, mixing 150g PAC and 150L Ultrafiltration (UF) effluent in pretreatment inlet water tank 19 to obtain PAC suspension, and mixing uniformly with stirring device to obtain 1 g.L-1. The dosage of the unit filtration area is 300 g.m-2The filtration area of the base membrane (PAC filter cake layer on the cloth bag 2) is 0.5m2PAC was added at 150 g. Continuously circulates between the PACPM device 21 and the precoating film inlet water tank 19 by the high-pressure water pump 20 until the coating is finished, and at the moment, the upper outlet water of the PACPM device 21 flows back to the precoating film inlet water tank 19 through the circulating return pipe 16. Continuously filtering PAC turbid liquid through the cloth bag 2 to form a PAC filter cake layer with a certain thickness on the cloth bag 2.
The PACPM device 21 adopts a bottom water inlet mode, can avoid the deposition of a coating medium at the bottom, has small difference between the PAC density and the water phase, and has similar specific gravity of the PAC density and the water phase. PAC suspension continuously flows in a circulation manner in the pretreatment equipment, PAC is retained on the cloth bag to accumulate into a compact filtering membrane, and suspended particles SS of effluent are 5 mg.L after the coating circulation for 30min-1Hereinafter, the PAC precoat film is formed.
As shown in FIG. 4, the SS decreased after 30 minutes of circulating the coating filmAs low as 5 mg.L-1The water appeared clear in the following, indicating that the coating film was complete.
(2) PACPM filtration
The tail water of the urban sewage treatment plant is used as the water to be treated, the water to be treated is used as the inlet water of the PACPM device for treatment, and the designed inlet water flow is 2-3m3·h-1。
After the film coating is finished, the circulating valve 11 is closed, the feeding valve 22 and the liquid outlet valve 12 are opened, the effluent water of the tertiary treatment of the pollution treatment plant is pumped into the pre-coating film water inlet water tank 19, the high-pressure water pump 20 is opened, the effluent water is filtered by the PACPM device 21, and the filtered effluent water directly enters the ultrafiltration water purification water tank 18. The water inlet flow is 2-3m3·h-1The pressure is below 0.08 MPa.
Examples
The effluent of the three-stage treatment of a certain urban sewage treatment plant in Qingdao city is used as water to be treated, the biochemical process of the treatment plant is an AAO + MBBR mixed sludge membrane process, and the three-stage advanced treatment process is coagulation, precipitation, filtration and ultraviolet disinfection. The quality of the inlet water is shown in table 1:
TABLE 1 basic Water quality
The treatment effect of the treatment of the tertiary treatment effluent of the sewage treatment plant is shown in fig. 5, 6, 7, 8 and 9. As can be seen from FIG. 5, DOC was from 9.55 mg.L at the start of filtration (0-1h)-1Reduced to 6.91 mg.L-1Removal rate 27.64%, UV254From 0.121cm-1Down to 0.077cm-1The removal rate is 36.36%;
as can be seen from FIG. 6, the UV of organic substances having molecular weights of 1kDa or less and 100kDa or more254Respectively from 0.038cm-1And 0.041cm-1Down to 0.008cm-1And 0.022cm-1The removal rates are 78.95% and 46.34% respectively;
as can be seen from fig. 7, the removal rate of the hydrophilic organic substance was 26.34%, and the removal rates of the hydrophobic organic substance and the transitional hydrophobic organic substance were 33.59% and 33.66%, respectively;
as is clear from FIGS. 8 and 9, the fluorescence intensity of the microbial metabolite region was 4.92X 107nm2Reduced to 3.39 × 107nm2The fluorescence intensity of humic substances of humic acids is from 6.14X 107nm2Reduced to 4.09X 107nm2The two regions were reduced by 31.10% and 33.39%, respectively.
Comparative example:
the powdery active carbon coating material is replaced by diatomite.
Diatomite is used as a pre-coating film coating material, and the film coating step and the filtering step are not changed. When the device runs for 1 hour, the pressure can be observed to rise, a yellow mud cake layer is attached to the diatomite precoating film, and the effluent flow rate is rapidly reduced. For DOC and UV254The removal effect is poor, and the treatment effect is shown in fig. 10.
Claims (10)
1. The utility model provides a membrane device is precoated to powdered activated carbon, characterized by, includes barrel and sack, and the lower extreme of barrel sets up the inlet, and the upper end sets up the liquid outlet, is provided with the sack in the barrel, and sack upper end opening just is connected with the barrel inner wall, and the sack lower extreme is sealed.
2. The powdered activated carbon pre-coating device as claimed in claim 1, wherein the cloth bag is sleeved on a support net cylinder, the upper end of the support net cylinder is open and is sealed with the inner wall of the cylinder body.
3. The powdered activated carbon pre-coating device according to claim 2, wherein the support screen cylinder has an inner diameter of 0.14-0.16 m.
4. The powdered activated carbon pre-coating device according to claim 1, wherein the cloth bag is a PTFE filter bag with a filter area of 0.5m2Flow rate of 0-40m3·m-2The filtration precision is 25 μm.
5. An ultrafiltration pretreatment device, which is characterized by comprising the powdered activated carbon pre-coating film device as claimed in any one of claims 1 to 4, and further comprising a pre-coating film water inlet tank, wherein a stirring device is arranged in the pre-coating film water inlet tank, the upper part of the pre-coating film water inlet tank is provided with a feed pipe and a circulation return pipe, the feed pipe is provided with a feed valve, the circulation return pipe is connected with a liquid outlet of the powdered activated carbon pre-coating film device through a circulating valve, the bottom of the pre-coating film water inlet tank is connected with a powder activated carbon pre-coating film device liquid inlet through a water pump and a conveying pipe, the liquid outlet of the powdered activated carbon pre-coating film device is connected with an ultrafiltration purified water tank through an output pipe, and a liquid outlet valve is arranged on the output pipe.
6. A method for operating the ultrafiltration pretreatment device according to claim 5, characterized in that the device is divided into a coating tank and a filtering tank, and the same precoating inlet water tank is used for both coating and filtering:
(1) coating PACPM:
opening a circulating valve, closing a liquid outlet valve, and performing a film coating process; the method comprises the steps of putting powdered activated carbon into a pre-coating film water inlet tank, mixing the powdered activated carbon and ultrafiltration effluent in a pretreatment water inlet tank to prepare activated carbon turbid liquid, stirring and mixing uniformly, and continuously circulating between a powdered activated carbon pre-coating film device and the pre-coating film water inlet tank through a water pump until film coating is completed.
(2) And (3) filtering PACPM:
and after the film coating is finished, closing the circulating valve, opening the feed valve and the liquid outlet valve, pumping the outlet water subjected to the three-stage treatment in the sewage treatment plant into a pre-coating film inlet water tank, and opening the water pump to filter the outlet water by using a powder activated carbon pre-coating film device.
7. The method of operating the pretreatment device according to claim 6, wherein the powdered activated carbon in the (1) PACPM coating film is a coal-based powdered activated carbon having an average particle diameter in the range of 30.07 to 33.42 μm.
8. Method for operating a pretreatment device according to claim 6Characterized in that the concentration of the active carbon suspension in the PACPM coating film (1) is 1 g.L-1。
9. The method according to claim 6, wherein said step (1) of coating the PACPM film with the suspended particles SS in the effluent after the coating cycle is 5 mg-L-1The following.
10. The method as set forth in claim 6, wherein the feed water flow rate in the (2) PACPM filtration is 2 to 3m3·h-1The pressure is below 0.08 MPa.
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