CN102139972A - Sewage treatment method and device - Google Patents

Sewage treatment method and device Download PDF

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Publication number
CN102139972A
CN102139972A CN 201110038588 CN201110038588A CN102139972A CN 102139972 A CN102139972 A CN 102139972A CN 201110038588 CN201110038588 CN 201110038588 CN 201110038588 A CN201110038588 A CN 201110038588A CN 102139972 A CN102139972 A CN 102139972A
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China
Prior art keywords
flocculation
water
tank
reaction tank
treatment method
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CN 201110038588
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Chinese (zh)
Inventor
张旭兵
罗海泉
高涛
郑斌
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BEIJING EN-E TECHNOLOGIES Co Ltd
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BEIJING EN-E TECHNOLOGIES Co Ltd
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Publication of CN102139972A publication Critical patent/CN102139972A/en
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  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention relates to a sewage treatment method and a device. The sewage treatment method comprises the steps: water to be treated is led to a coagulation reaction tank; a coagulant is added into the coagulation reaction tank and is led to be uniformly mixed with water to be treated so as to form a mixed water to be treated; the mixed water to be treated is led to a flocculation reaction tank; a flocculating agent is added to the flocculation reaction tank to be stirred for carrying out flocculation reaction so as to form a flocs liquid; the flocs liquid is led to a sedimentation basin for carrying out muddy water separation so as to separate flocs liquid into liquid supernatant and sludge; the separated liquid supernatant is led to a membrane device and led out after being intercepted; after the separated sludge is settled and concentrated, one part of sludge is discharged, one part of sludge flows to a flocs reaction tank in a backing way and reacts with flocs. The method adopts the coagulation reaction tank and flocculation reaction tank which are separated, organically combines precipitation process and membrane treatment process, and leads sewage treatment to have few one-time investment, is simple to operate and has low operating cost. The treated water can reach the water quality requirements of ultra-filtration water.

Description

Sewage water treatment method and equipment
Technical field
The invention belongs to technical field of sewage, specifically, relating to can be with sewage after treatment, and water outlet directly reaches the sewage water treatment method and the sewage disposal device of the water quality standard of reuse.
Background technology
In the advanced treatment process of water, reach water quality requirement preferably as need, generally adopt ultra-filtration membrane that water is handled.But ultra-filtration membrane has certain requirement to influent quality, when treating water contains suspended substance when higher, can only adopt the MBR ultra-filtration membrane to handle, because MBR ultra-filtration membrane flux is lower, therefore, the ultra-filtration membrane quantity that needs is more, and one-time investment is big.Adopt submerged ultrafiltration can adopt higher membrane flux, reduce the usage quantity of ultra-filtration membrane, reduce the investment of film, but submerged ultrafiltration requires to intake suspended substance can not be very high, therefore, must adopt pretreatment technology, at first reduce the suspended substance of water inlet, and then adopt the immersion ultrafiltration to handle, the operation of this kind technological process is complicated, floor space is big.In addition, in the treating processes of micro-polluted water, because the organic contamination substrate concentration that contains in the water is low, can't adopt biological treatment to remove, conventional processes can not reach the purpose of removing organic pollutant again.
At above-mentioned, the efficient materialization water treating pond of existing employing is handled sewage, as on August 8th, 2007 bulletin, notification number is the disclosed settling tank of Chinese utility model patent of " CN2931458Y ", it is made up of micro swirl mixing, flocculation reaction, mud concentrated the separation with tube settling, though it can be fit to handle municipal water supply, sewage, middle water depth processing reuse, but it can not satisfy and requires treating water to reach the water quality requirement of ultrafiltration water outlet in the advanced treatment process of sewage.
Summary of the invention
Technical problem to be solved by this invention is, handling treating processes at traditional wastewater needs segmentation to implement, perhaps need to adopt the shortcoming of MBR film, provide that one-time investment is little, operation is simple, working cost is low, treating water reaches the sewage water treatment method of the water quality requirement of ultrafiltration water outlet.
To achieve these goals, sewage water treatment method of the present invention comprises the steps:
S100: pending water is introduced a coagulation reaction tank, adds coagulating agent and make it with pending water mixes in coagulation reaction tank, to form the pending water of mixing;
S200: will mix pending water and introduce a flocculation tank, and in flocculation tank, add flocculation agent stirring carrying out flocculation reaction, to form flco liquid;
S300: flco liquid is introduced a settling tank, in settling tank, carry out mud-water separation so that flco liquid is separated into supernatant liquor and mud, the supernatant liquor of separating introduced draw after a film device is held back, the sludge settling of separating is concentrated a back part is discharged, a part is back to flocculation tank and participates in flocculation reaction.
Above-mentioned sewage water treatment method, wherein, the described residence time of pending water in described coagulation reaction tank is set to 120～180s.
Above-mentioned sewage water treatment method, wherein, the described residence time of pending water in described coagulation reaction tank is set to 140～160s.
Above-mentioned sewage water treatment method, wherein, described coagulating agent is liquid polymerization ferric sulfate or PAC, its dosage is 10～25mg/L.
Above-mentioned sewage water treatment method, wherein, described flocculation agent is PAM, its dosage is 0.5～1.0mg/L.
Above-mentioned sewage water treatment method, wherein, the residence time of the pending water of described mixing in described flocculation tank is set to 10～30min.
Above-mentioned sewage water treatment method, wherein, the residence time of the pending water of described mixing in described flocculation tank is set to 12～15min.
Above-mentioned sewage water treatment method wherein, describedly is back to sludge quantity that flocculation tank participates in flocculation reaction and is not less than 4% of the flooding velocity that mixes pending water.
Above-mentioned sewage water treatment method, wherein, the flow velocity when described supernatant liquor is introduced into described film device is 30～50m/h.
The present invention further provides the sewage disposal device of realizing aforesaid method, this sewage disposal device comprises
Coagulation reaction tank, it is provided with the coagulating agent throwing device, is provided with agitator in it;
Flocculation tank is provided with agitator in it, described agitator below is provided with the flocculation throwing device; And
Settling tank, described settling tank top is provided with the inclined tube tripping device, the bottom is provided with the mud enrichment region and mud scrapes collection device, described mud scrapes the collection device below and is provided with shore pipe and the mud return line that leads to outside the settling tank, described mud return line communicates with described flocculation tank, is provided with film device in described settling tank above described inclined tube tripping device.
Above-mentioned sewage disposal device wherein, also is provided with agitator in the described coagulation reaction tank.
Above-mentioned sewage disposal device wherein, is provided with into water current stabilization district before the described coagulation reaction tank, is provided with water outlet current stabilization district afterwards.
Above-mentioned sewage disposal device, wherein, described film device comprises film group frame and ultra-filtration membrane, described ultra-filtration membrane is installed on the described film group frame, and the membrane flux 〉=50L/m of described ultra-filtration membrane 2.h.
Beneficial functional of the present invention is, adopt split coagulation-flocculation reaction tank, and precipitation process and film treating processes organically combined, make that the sewage disposal one-time investment is little, operation is simple, working cost is low and treating water can reach the water quality requirement of ultrafiltration water outlet.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is a sewage water treatment method schema of the present invention;
Fig. 2 is a sewage disposal device structure iron of the present invention.
Wherein, Reference numeral
The 10-coagulation reaction tank
11-water inlet current stabilization district
12-coagulating tank main body
13-water outlet current stabilization district
The 14-agitator
15-coagulating agent throwing device
The 20-flocculation tank
21-flocculation water inlet current stabilization district
The 22-inlet channel
23-flocculation agent throwing device
The 24-agitator
25-flocculation reaction tank main body
The 26-zone of transition
The 30-settling tank
31-preliminary sedimentation district
32-inclined tube tripping device
The 33-film device
The 34-mud level meter
35-mud enrichment region
36-scrapes collection device
41,42-sludge circulation pump
43-mud discharging pump
The 44-shore pipe
The 45-mud return line
Embodiment
Below in conjunction with the drawings and specific embodiments technical solution of the present invention being described in detail, further understanding purpose of the present invention, scheme and effect, but is not the restriction as claims protection domain of the present invention.
Consult Fig. 1 sewage water treatment method schema of the present invention, as shown in the figure, sewage water treatment method of the present invention comprises the steps:
S100: pending water is introduced a coagulation reaction tank, adds coagulating agent and make it with pending water mixes in coagulation reaction tank, to form the pending water of mixing;
S200: will mix pending water and introduce a flocculation tank, and in flocculation tank, add flocculation agent stirring carrying out flocculation reaction, to form flco liquid;
S300: flco liquid is introduced a settling tank, in settling tank, carry out mud-water separation so that flco liquid is separated into supernatant liquor and mud, the supernatant liquor of separating introduced draw after a film device is held back, the sludge settling of separating is concentrated a back part is discharged, a part is back to flocculation tank and participates in flocculation reaction.
In above-mentioned steps S100, the residence time of pending water in coagulation reaction tank is set to 120～180s, and the preferred residence time is set to 140～160s.Coagulating agent can be liquid polymerization ferric sulfate or PAC, its dosage is 10～25mg/L, further, coagulating agent can also adopt Powdered Activated Carbon, the lime medicament, powder sand, fine sand or biological treatment agent, coagulating agent is joined it in coagulation reaction tank by special throwing device, throwing device adopts the dry powder metering, modular arrangements, whole process automatization control and airtight operation, when adopting fine sand or biological treatment agent, fine sand or biological treatment agent particle diameter are 80～100um, and the dosage of fine sand is no more than 3mg/L, the preferential 2mg/L that selects, the dosage of biological treatment agent is no more than 50mg/l, and concrete dosage can be determined according to the requirement of water outlet COD.
Flocculation reaction described in the step S200, be to circulate and quicken flocculation and multistage flocculation reaction to mixing pending water, to reduce the best flocculation reaction time, to mix the residence time of pending water in flocculation tank to be set to 10～30min, the preferred residence time is 12～15min.Flocculation agent is PAM, and its dosage is 0.5～1.0mg/L.In this step, to utilize agitator will mix pending water and promote circulation, lifting capacity is not less than 1/10th of flooding quantity, to realize the further closely knit increase of flocculation reaction thing, improves the settling velocity of flocculation reaction product.
In above-mentioned steps S300, the sludge quantity that is back to flocculation tank is not less than 4% of the flooding velocity that mixes pending water.And, the membrane flux 〉=50L/m of film device 2.h, the flow velocity when supernatant liquor is introduced into described film device is 30～50m/h, and preferable flow rate is 40m/h.
Consult Fig. 2 sewage disposal device structure iron of the present invention, as shown in the figure, sewage disposal device of the present invention comprises coagulation reaction tank 10, flocculation tank 20 and the settling tank 30 that is provided with in turn along water (flow) direction.
Coagulation reaction tank 10 comprises into water current stabilization district 11,13 3 zones of coagulating tank main body 12 and water outlet current stabilization district, coagulation reaction tank 10 is provided with coagulating agent throwing device 15, this coagulating agent throwing device 15 is used for dosing coagulant in water inlet current stabilization district 11 and coagulating tank main body 12, be provided with agitator 14 in the coagulating tank main body 12, this agitator 14 is used to quicken mixing of coagulating agent and pending water, mixes pending water to form.Agitator 14 can adopt axial flow type stirrer, grid agitator or board-like agitator herein, and when adopting axial flow type stirrer, the velocity gradient g value should be 200～240S -When adopting grid agitator or board-like agitator, the velocity gradient g value should be 500～1000S -
Flocculation tank 20 comprises into water current stabilization district 21, inlet channel 22, flocculation reaction tank main body 25 and 26 4 zones of zone of transition, be provided with agitator 24 in the flocculation reaction tank main body 25, agitator 24 belows are provided with flocculant concentration device 23, and the diapire of flocculation reaction tank main body 25 is provided with the return line with exterior.Flocculant concentration device 23 is used for adding flocculation agent in flocculation reaction tank main body 25, the returned sluge that agitator 24 is used for the thorough mixing flocculation agent, mixes pending water and come from mud return line.In order to reach well-mixed purpose, require the stirring velocity of agitator 24 to be no more than under the situation of 25rpm (rotations per minute), the circulation multiple is not less than 10 times of feed liquor amount, like this, mix the fully contact in flocculation reaction tank main body 25 of pending water, flocculation agent, returned sluge, form high-density, large volume flco (also being flco liquid) through the pending water of mixing after the flocculation reaction, then, the flco liquid of generation is introduced settling tank 30 through zone of transition 26 backs.
Settling tank 30 comprises preliminary sedimentation district 31 and mud enrichment region 35.Settling tank 30 tops are provided with preliminary sedimentation district 31 and inclined tube tripping device 32, and mud enrichment region 35 is set in the bottom and mud scrapes collection device 36.Be provided with the shore pipe and the mud return line that lead to outside the settling tank below mud scrapes collection device 36, mud return line communicates with flocculation tank 20.Mud enrichment region 35 tops also are provided with mud level meter 34, and this mud level meter 34 is used for surveying sludge interface.Specifically, be provided with film device 33 in settling tank 30 above inclined tube tripping device 32, this film device comprises film group frame and ultra-filtration membrane, and ultra-filtration membrane is installed on the film group frame, and the membrane flux 〉=50L/m of ultra-filtration membrane 2H.
The diapire of settling tank 30 is positioned at mud and scrapes collection device 36 lower positions and be provided with shore pipe 44 and mud return line 45, part mud is discharged from shore pipe 44 by the effect of mud discharging pump 43, part mud is back to flocculation tank participation flocculation reaction by the effect of sludge circulation pump 41 from mud return line 45, in the mud return flow path, further delivering medicament is to quicken flocculation.In order to ensure the mud circulation, mud return line 45 also is connected with another sludge circulation pump 42, and this sludge circulation pump 42 is used as stand-by pump.
As preferred embodiment of the present invention, it is 50mm that above-mentioned inclined tube tripping device 32 adopts the aperture, highly is the netted tripping device of 1000mm, and the smooth surface of device.The material of ultra-filtration membrane is PVDF, is installed on the film group frame, and film group frame can take out and carry out matting, and film group frame adopts the 316L material, and the height of film group frame is no more than 1000mm.And preliminary sedimentation district 31 is 1: 3～1: 2 with the subregion ratio of netted disengaging zone (netted disengaging zone herein refers to the zone at inclined tube tripping device 32 places).
Sewage disposal device working process of the present invention is:
Pending water enters coagulation reaction tank 10, and dosing coagulant in the coagulation reaction tank 10 forms and mixes pending water; Mix pending water and enter flocculation tank 20, mix with returned sluge, add flocculation agent, form big wadding flower and form flco liquid under the effect of agitator, gravity flow enters settling tank 30 then; In settling tank 30, carry out mud-water separation fast on the one hand, supernatant liquor is that 30-40m/h separates by the inclined tube tripping device by upflow velocity, discharge behind the pre-on the other hand crown_interception of supernatant liquor by ultra-filtration membrane, the mud of separating is discharged by scraping collection device 36 after mud enrichment region 35 concentrates.
Through the water after the sewage disposal device processing of the present invention, its effluent quality SS is less than 1mg/L, and COD is less than 30mg/L.
The present invention has following advantage:
(1) add coagulating agent at coagulation basin, can make pending water and coagulating agent thorough mixing, in and the flco electricity examine, help the generation of flocculence thing;
(2) adopt precipitating sludge outer circulation particle to quicken flocculation, pending liquid is flocculated better, with speed and the degree of accelerating to purify;
(3) adopt the inclined tube tripping device to combine, improved membrane flux greatly, reduced the film investment with the film reaction device;
(4) adopt multistage split coagulation, flocculation tank, it is big that the precipitating sludge wadding is spent, and bottom sludge concentration height has reduced sludge quantity.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (13)

1. a sewage water treatment method is characterized in that, comprises the steps:
S100: pending water is introduced a coagulation reaction tank, adds coagulating agent and make it with pending water mixes in coagulation reaction tank, to form the pending water of mixing;
S200: will mix pending water and introduce a flocculation tank, and in flocculation tank, add flocculation agent stirring carrying out flocculation reaction, to form flco liquid;
S300: flco liquid is introduced a settling tank, in settling tank, carry out mud-water separation so that flco liquid is separated into supernatant liquor and mud, the supernatant liquor of separating introduced draw after a film device is held back, the sludge settling of separating is concentrated a back part is discharged, a part is back to flocculation tank and participates in flocculation reaction.
2. sewage water treatment method according to claim 1 is characterized in that, the described residence time of pending water in described coagulation reaction tank is set to 120～180s.
3. sewage water treatment method according to claim 2 is characterized in that, the described residence time of pending water in described coagulation reaction tank is set to 140～160s.
4. sewage water treatment method according to claim 1 is characterized in that, described coagulating agent is liquid polymerization ferric sulfate or PAC, and its dosage is 10～25mg/L.
5. sewage water treatment method according to claim 1 is characterized in that, described flocculation agent is PAM, and its dosage is 0.5～1.0mg/L.
6. sewage water treatment method according to claim 1 is characterized in that, the residence time of the pending water of described mixing in described flocculation tank is set to 10～30min.
7. sewage water treatment method according to claim 6 is characterized in that, the residence time of the pending water of described mixing in described flocculation tank is set to 12～15min.
8. sewage water treatment method according to claim 1 is characterized in that, describedly is back to sludge quantity that flocculation tank participates in flocculation reaction and is not less than 4% of the flooding velocity that mixes pending water.
9. sewage water treatment method according to claim 1 is characterized in that, the flow velocity when described supernatant liquor is introduced into described film device is 30～50m/h.
10. a sewage disposal device is characterized in that, comprises
Coagulation reaction tank, it is provided with the coagulating agent throwing device, is provided with agitator in it;
Flocculation tank is provided with agitator in it, described agitator below is provided with the flocculation throwing device; And
Settling tank, described settling tank top is provided with the inclined tube tripping device, the bottom is provided with the mud enrichment region and mud scrapes collection device, described mud scrapes the collection device below and is provided with shore pipe and the mud return line that leads to outside the settling tank, described mud return line communicates with described flocculation tank, is provided with film device in described settling tank above described inclined tube tripping device.
11. sewage disposal device according to claim 10 is characterized in that, also is provided with agitator in the described coagulation reaction tank.
12. sewage disposal device according to claim 10 is characterized in that, is provided with into water current stabilization district before the described coagulation reaction tank, is provided with water outlet current stabilization district afterwards.
13. sewage disposal device according to claim 10 is characterized in that, described film device comprises film group frame and ultra-filtration membrane, and described ultra-filtration membrane is installed on the described film group frame, and the membrane flux 〉=50L/m of described ultra-filtration membrane 2.h.
CN 201110038588 2011-02-15 2011-02-15 Sewage treatment method and device Pending CN102139972A (en)

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Cited By (10)

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CN104803462A (en) * 2015-04-14 2015-07-29 南通华新环保设备工程有限公司 Technological method for advanced sewage treatment
CN105000714A (en) * 2015-07-22 2015-10-28 浙江省环境工程有限公司 Coagulation treatment and membrane separation combined waste water treatment system and application thereof
CN106517591A (en) * 2016-12-15 2017-03-22 青岛锦龙弘业环保有限公司 Reverse osmosis concentration treatment system and method
CN107777805A (en) * 2016-08-30 2018-03-09 宜兴市锦桢铸造材料有限公司 Cutting fluid waste water process retracting device
CN109205749A (en) * 2018-11-12 2019-01-15 南京大学 A kind of coagulation-sedimentation equipment and method based on the reflux of sludge concentration tank supernatant
CN110078262A (en) * 2019-05-20 2019-08-02 南京师范大学 A kind of integrated reactor and its minimizing technology removing traces of antibiotic in combined pollution surface water
CN111320295A (en) * 2019-12-23 2020-06-23 山西国控环球工程有限公司 Pretreatment equipment and method for advanced treatment and recycling of industrial wastewater
CN112358017A (en) * 2020-10-27 2021-02-12 北京翰祺环境技术有限公司 System and method for treating sewage by utilizing induced crystallization
CN112830596A (en) * 2019-11-25 2021-05-25 福建杰达环保科技有限公司 Device and method for removing iron and manganese in water body by membrane combined process
CN114249453A (en) * 2021-11-29 2022-03-29 中冶赛迪工程技术股份有限公司 Coagulation-sedimentation-ultrafiltration integrated device

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CN104803462A (en) * 2015-04-14 2015-07-29 南通华新环保设备工程有限公司 Technological method for advanced sewage treatment
CN105000714A (en) * 2015-07-22 2015-10-28 浙江省环境工程有限公司 Coagulation treatment and membrane separation combined waste water treatment system and application thereof
CN107777805A (en) * 2016-08-30 2018-03-09 宜兴市锦桢铸造材料有限公司 Cutting fluid waste water process retracting device
CN106517591A (en) * 2016-12-15 2017-03-22 青岛锦龙弘业环保有限公司 Reverse osmosis concentration treatment system and method
CN109205749A (en) * 2018-11-12 2019-01-15 南京大学 A kind of coagulation-sedimentation equipment and method based on the reflux of sludge concentration tank supernatant
CN110078262A (en) * 2019-05-20 2019-08-02 南京师范大学 A kind of integrated reactor and its minimizing technology removing traces of antibiotic in combined pollution surface water
CN110078262B (en) * 2019-05-20 2022-07-12 南京师范大学 Integrated reactor for removing trace antibiotics in composite polluted surface water and removing method thereof
CN112830596A (en) * 2019-11-25 2021-05-25 福建杰达环保科技有限公司 Device and method for removing iron and manganese in water body by membrane combined process
CN111320295A (en) * 2019-12-23 2020-06-23 山西国控环球工程有限公司 Pretreatment equipment and method for advanced treatment and recycling of industrial wastewater
CN112358017A (en) * 2020-10-27 2021-02-12 北京翰祺环境技术有限公司 System and method for treating sewage by utilizing induced crystallization
CN112358017B (en) * 2020-10-27 2023-12-19 北京翰祺环境技术有限公司 System and method for treating sewage by utilizing induced crystallization
CN114249453A (en) * 2021-11-29 2022-03-29 中冶赛迪工程技术股份有限公司 Coagulation-sedimentation-ultrafiltration integrated device

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Application publication date: 20110803