CN102417252A - Adjustable mechanical flocculation reaction method for enhancing coagulation by using grids - Google Patents
Adjustable mechanical flocculation reaction method for enhancing coagulation by using grids Download PDFInfo
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- CN102417252A CN102417252A CN2011103163242A CN201110316324A CN102417252A CN 102417252 A CN102417252 A CN 102417252A CN 2011103163242 A CN2011103163242 A CN 2011103163242A CN 201110316324 A CN201110316324 A CN 201110316324A CN 102417252 A CN102417252 A CN 102417252A
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Abstract
The invention discloses an adjustable mechanical flocculation reaction method for enhancing coagulation by using grids, which relates to the field of water treatment and is used for solving the problem that energy cannot be uniformly distributed into water when stirring paddles are used for coagulating during the conventional water treatment. The method comprises the following steps of: I, arranging a grid in each region between a horizontal shaft and a vertical shaft on blades of a first-stage stirring paddle and a second-stage stirring paddle respectively, wherein the diameter of the mesh inscribed circle of each grid on the first-stage stirring paddle is 5-50 millimeters, the diameter of the mesh inscribed circle of each grid on the second-stage stirring paddle is 10-60 millimeters, and the diameter of the mesh inscribed circle of each grid on the second-stage stirring paddle is required to be 5-15 millimeters larger than that of the mesh inscribed circle of each grid on the first-stage stirring paddle; and II, setting the number of revolutions of the first-stage stirring paddle as 2-5 revolutions per minute, the number of revolutions of the second-stage stirring paddle as 1-3.5 revolutions per minute and the number of revolutions of the third-stage stirring paddle as 0.5-2.5 revolutions per minute. The method is applied to industries of water treatment, chemical industry and the like.
Description
Technical field
The present invention relates to a kind of water treatment field, be specifically related to a kind of mechanical agitation type flocculation reaction method.
Background technology
Coagulation is meant that water treatment field is in carrying out water treatment procedure; Pass through dosing coagulant; Hydrolysis produces the product compression electric double layer of high electric charge low polymerization degree; After in addition suitable mixing is stirred, make colloidal solid in the water overcome repulsive force and combine and form flocculation, be beneficial to further deposition, air supporting or filtration treatment.Existing flocculation apparatus mainly is divided into two big types: waterpower stirring-type and mechanical agitation type, and waterpower stirring-type flocculation apparatus can not be regulated operating parameter according to water quality and quantity, and adaptive faculty is poor; At present, flocculation apparatus the most commonly used is a mechanical agitation type, and this scheme can be regulated parameters such as rotating speed according to water quality and quantity; But the stirring rake (see figure 2) of mechanical agitation type can not be distributed in energy even in the water, and velocity slope is big near the stirring rake blade, easily the flco that forms is smashed; Owing to transverse axis on two blades and the deficiency of the zone-perturbation between the vertical axes, flco can not fully be grown up, and smashes the problem that can not fully grow up with flco for solving flco; What have installs and fixes the formula graticule mesh perpendicular to water (flow) direction in flocculation basin; But fixed graticule mesh can not be regulated with former regimen condition, and disturbance deficiency when the water yield is low, water temperature can not increase energy when low input promotes flco to generate; And remove and install complicacy, in practical application, be restricted; The water factory that also has comes the enhanced coagulation process through the means such as throwing amount, use coagulating agent and coagulant aids of regulating former water pH, increase coagulating agent; But increase the throwing amount of coagulating agent and regulate pH; Can increase the residual of sludge quantity and water treatment agent on the one hand, increase the running cost of water treatment on the other hand.
Summary of the invention
The objective of the invention is in order to solve the flucculation process that mechanical agitation type is adopted in existing water treatment; Utilize stirring rake to carry out coagulation; Owing between transverse axis on two blades and the vertical axes penetrating zone being arranged, this zone can not be distributed in energy even in the water, causes disturbance not enough; The problem that flco can not fully be grown up provides a kind of adjustable mechanical flocculation reaction method of utilizing the graticule mesh enhanced coagulation.
Method of the present invention realizes through following steps: said method realizes based on mechanical flocculation tank; Said mechanical flocculation tank has three grades; Be respectively one-level flocculation tank, secondary flocculation tank and three grades of flocculation tanks; One-level flocculation tank, secondary flocculation tank and three grades of flocculation tanks are set gradually by flocculation basin feed-water end to flocculation basin water side; A stirring rake is arranged in every grade of flocculation basin, and corresponding stirring rake is respectively one-level stirring rake, secondary stirring rake and three grades of stirring rakes in one-level flocculation tank, secondary flocculation tank and the three grades of flocculation tanks; Step 1, one-level stirring rake and secondary stirring rake are laid graticule mesh: in the transverse axis on the blade of one-level stirring rake and secondary stirring rake and each zone between the vertical axes graticule mesh is set respectively; The transverse axis corresponding with it is connected with vertical axes around each graticule mesh; The mesh inscribed circle diameter of each graticule mesh on the one-level stirring rake is 5mm～50mm; The mesh inscribed circle diameter of each graticule mesh on the secondary stirring rake is 10mm～60mm, and the mesh inscribed circle diameter of each graticule mesh on the secondary stirring rake should be greater than the mesh inscribed circle diameter 5mm～15mm of each graticule mesh on the one-level stirring rake; Step 2, confirm the revolution of stirring rakes at different levels: the revolution of one-level stirring rake is 2 rev/mins～5 rev/mins, and the revolution of secondary stirring rake is 1 rev/min～3.5 rev/mins, and the revolution of three grades of stirring rakes is 0.5 rev/min～2.5 rev/mins.
The present invention compared with prior art has following beneficial effect: one, the present invention is through being provided with graticule mesh 2 on the one-level stirring rake of mechanical flocculation tank and secondary stirring rake, and graticule mesh 2 can be used as the coagulation core as solid-phase media in water, can destroy the colloid hydration shell simultaneously; Produce the micro-vortex that is beneficial to coagulation in a large number; And energy is distributed in the water more uniformly, therefore, disturbance is sufficient; Flco can fully be grown up, and is particularly suitable for the intensified process of low temperature and low turbidity water.Two, the mesh aperture of the graticule mesh 2 of the present invention on one-level stirring rake and secondary stirring rake increases progressively successively, can significantly improve coagulation effect, and the dosage of the coagulating agent of reduction by 15～20% has been practiced thrift cost of water treatment.Three, the present invention can significantly reduce dosage under the identical condition of effluent quality, and has investment advantage little, convenient for installation and maintenance.
Description of drawings
Fig. 1 is the structural representation that graticule mesh 2 back stirring rakes are set on one-level stirring rake or the secondary stirring rake, and Fig. 2 is the structural representation of the stirring rake of existing machinery stirring-type.
Embodiment
Embodiment one: combine Fig. 1 that this embodiment is described; This embodiment is realized through following steps: this embodiment is realized based on mechanical flocculation tank; The machinery flocculation tank has three grades; Be respectively one-level flocculation tank, secondary flocculation tank and three grades of flocculation tanks; One-level flocculation tank, secondary flocculation tank and three grades of flocculation tanks are set gradually by flocculation basin feed-water end to flocculation basin water side; And the water in one-level flocculation tank, secondary flocculation tank and the three grades of flocculation tanks have a stirring rake in every grade of flocculation basin, and corresponding stirring rake is respectively one-level stirring rake, secondary stirring rake and three grades of stirring rakes in one-level flocculation tank, secondary flocculation tank and the three grades of flocculation tanks; Step 1, one-level stirring rake and secondary stirring rake are laid graticule mesh 2: in the transverse axis 1-1 on the blade 1 of one-level stirring rake and secondary stirring rake and each zone between the vertical axes 1-2 graticule mesh 2 is set respectively; The transverse axis 1-1 corresponding with it is connected with vertical axes 1-2 binding, welding or connect elements around each graticule mesh 2; The mesh inscribed circle diameter of each graticule mesh 2 on the one-level stirring rake is 5mm～50mm; The mesh inscribed circle diameter of each graticule mesh 2 on the secondary stirring rake is 10mm～60mm; The mesh inscribed circle diameter of each graticule mesh 2 on the secondary stirring rake should be greater than the mesh inscribed circle diameter 5mm～15mm of each graticule mesh 2 on the one-level stirring rake; For newly-built mechanical flocculation basin; The mesh inscribed circle diameter of graticule mesh 2 can be chosen smaller value, for the transformation of existing machinery flocculation basin, the mesh inscribed circle diameter of graticule mesh 2 is corresponding choose bigger; Step 2, confirm the revolution of stirring rakes 1 at different levels: the revolution of one-level stirring rake is 2 rev/mins～5 rev/mins, and the revolution of secondary stirring rake is 1 rev/min～3.5 rev/mins, and the revolution of three grades of stirring rakes is 0.5 rev/min～2.5 rev/mins.The test result of the power measuring that can connect according to the stirring rake motor is regulated the rotating speed of stirring rake automatically, when the power meter reading is lower than set(ting)value, increases rotating speed of agitator; When the power meter reading is higher than set(ting)value, reduce rotating speed of agitator; Can regulate area and the width of mesh that increases graticule mesh on the stirring rake according to the variation of the water quality water temperature and the water yield, when water temperature was low, the power meter set(ting)value improved, and increase the graticule mesh area that increases on the stirring rake and adopt large mesh graticule mesh.
Embodiment two: combine Fig. 1 that this embodiment is described, each graticule mesh 2 is made up of stainless steel housing 2-1 and Stainless Steel Cloth 2-2 in the step 1 of this embodiment, welds with stainless steel housing 2-1 around the Stainless Steel Cloth 2-2.Other step is identical with embodiment one.
Embodiment three: combine Fig. 1 that this embodiment is described, the mesh of the Stainless Steel Cloth 2-2 of this embodiment is rectangle, trilateral or Polygons.Other step is identical with embodiment one.
Embodiment four: combine Fig. 1 that this embodiment is described, the diameter of the Stainless Steel Wire on the Stainless Steel Cloth of this embodiment (2-2) is 0.8mm～5mm.For newly-built mechanical flocculation basin, the diameter of Stainless Steel Wire is slightly thick, and for the transformation of existing machinery flocculation basin, the rust gauge of wire can carefully to reduce resistance and weight, be avoided original system is caused excessive change.Other step is identical with embodiment one.
Embodiment five: combine Fig. 1 that this embodiment is described; In transverse axis 1-1 in the step 1 of this embodiment on the blade 1 of three grades of stirring rakes and each zone between the vertical axes 1-2 graticule mesh 2 is set; The transverse axis 1-1 corresponding with it is connected with vertical axes 1-2 binding, welding or connect elements around this graticule mesh 2; The mesh inscribed circle diameter of each graticule mesh 2 on three grades of stirring rakes is 20mm～70mm, and the mesh inscribed circle diameter of each graticule mesh 2 on three grades of stirring rakes should be greater than the mesh inscribed circle diameter 10mm of each graticule mesh 2 on the secondary stirring rake.Other step is identical with embodiment one.
Application example of the present invention:
This instance is certain newly-built water factory, and flocculation basin is of a size of: length * wide * height=6.3m * 4.3m * 4.6m, horizontal shaft type stirring rake.One-level stirring rake and secondary stirring rake are transformed; In transverse axis 1-1 on the blade 1 of one-level stirring rake and secondary stirring rake and each zone between the vertical axes 1-2 graticule mesh 2 is set respectively; Adopting the diameter of Stainless Steel Wire is 1.5mm; The mesh aperture of each graticule mesh 2 is counted 25mm with the mesh inscribed circle diameter, and stainless steel housing 2-1 is of a size of: length * wide=4mm * 3mm; Electric machine frequency is 18HZ, and the motor lines electric current is 3.5A, and motor speed is 2.4 rev/mins.Result through above-mentioned simulated experiment is: after increasing graticule mesh 2, when dosage was 60mg/L, the coagulation effect in the flocculation basin is the effect when not adding the graticule mesh dosage and be 80mg/L just; After increasing graticule mesh 2, when dosage was 70mg/L, the coagulation effect in the flocculation basin just surpassed the effect when not adding the graticule mesh dosage and being 80mg/L.Experiment showed, that under the identical situation of water quality, the inventive method can be saved 15%～20% coagulating agent input amount, increase after the graticule mesh under the approaching condition of energy consumption the energy consumption increase seldom.
Claims (5)
1. adjustable mechanical flocculation reaction method of utilizing the graticule mesh enhanced coagulation; Said method realizes through following steps: said method realizes based on mechanical flocculation tank; Said mechanical flocculation tank has three grades; Be respectively one-level flocculation tank, secondary flocculation tank and three grades of flocculation tanks; One-level flocculation tank, secondary flocculation tank and three grades of flocculation tanks are set gradually by flocculation basin feed-water end to flocculation basin water side; A stirring rake is arranged in every grade of flocculation basin, and corresponding stirring rake is respectively one-level stirring rake, secondary stirring rake and three grades of stirring rakes in one-level flocculation tank, secondary flocculation tank and the three grades of flocculation tanks; It is characterized in that: step 1, one-level stirring rake and secondary stirring rake are laid graticule mesh (2): in the transverse axis (1-1) on the blade (1) of one-level stirring rake and secondary stirring rake and each zone between the vertical axes (1-2) graticule mesh (2) is set respectively; The transverse axis (1-1) corresponding with it is connected with vertical axes (1-2) around each graticule mesh (2); The mesh inscribed circle diameter of each graticule mesh (2) on the one-level stirring rake is 5mm～50mm; The mesh inscribed circle diameter of each graticule mesh (2) on the secondary stirring rake is 10mm～60mm, and the mesh inscribed circle diameter of each graticule mesh (2) on the secondary stirring rake should be greater than the mesh inscribed circle diameter 5mm～15mm of each graticule mesh (2) on the one-level stirring rake; Step 2, confirm the revolution of stirring rakes at different levels (1): the revolution of one-level stirring rake is 2 rev/mins～5 rev/mins, and the revolution of secondary stirring rake is 1 rev/min～3.5 rev/mins, and the revolution of three grades of stirring rakes is 0.5 rev/min～2.5 rev/mins.
2. according to the said a kind of adjustable mechanical flocculation reaction method of utilizing the graticule mesh enhanced coagulation of claim 1; It is characterized in that: each graticule mesh (2) is made up of stainless steel housing (2-1) and Stainless Steel Cloth (2-2) in the said step 1, and Stainless Steel Cloth (2-2) welds with stainless steel housing (2-1) all around.
3. according to the said a kind of adjustable mechanical flocculation reaction method of utilizing the graticule mesh enhanced coagulation of claim 2, it is characterized in that: the mesh of said Stainless Steel Cloth (2-2) is rectangle, trilateral or Polygons.
4. according to claim 2 or 3 said a kind of adjustable mechanical flocculation reaction methods of utilizing the graticule mesh enhanced coagulation, it is characterized in that: the diameter of the Stainless Steel Wire on the said Stainless Steel Cloth (2-2) is 0.8mm～5mm.
5. according to the said a kind of adjustable mechanical flocculation reaction method of utilizing the graticule mesh enhanced coagulation of claim 1; It is characterized in that: in the transverse axis (1-1) in the said step 1 on the blade (1) of three grades of stirring rakes and each zone between the vertical axes (1-2) graticule mesh (2) is set; The transverse axis (1-1) corresponding with it is connected with vertical axes (1-2) binding, welding or connect elements around this graticule mesh (2); The mesh inscribed circle diameter of each graticule mesh (2) on three grades of stirring rakes is 20mm～70mm, and the mesh inscribed circle diameter of each graticule mesh (2) on three grades of stirring rakes should be greater than the mesh inscribed circle diameter 10mm of each graticule mesh (2) on the secondary stirring rake.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110316324 CN102417252B (en) | 2011-10-18 | 2011-10-18 | Adjustable mechanical flocculation reaction method for enhancing coagulation by using grids |
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| CN 201110316324 CN102417252B (en) | 2011-10-18 | 2011-10-18 | Adjustable mechanical flocculation reaction method for enhancing coagulation by using grids |
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| CN102417252A true CN102417252A (en) | 2012-04-18 |
| CN102417252B CN102417252B (en) | 2013-08-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2569901Y (en) * | 2002-09-18 | 2003-09-03 | 孙喆 | Lattice pulpboard type mechanical mixing reactor |
| CN201008763Y (en) * | 2007-03-16 | 2008-01-23 | 江苏金山环保工程有限公司 | Bucket grid flocculation device |
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2011
- 2011-10-18 CN CN 201110316324 patent/CN102417252B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2569901Y (en) * | 2002-09-18 | 2003-09-03 | 孙喆 | Lattice pulpboard type mechanical mixing reactor |
| CN201008763Y (en) * | 2007-03-16 | 2008-01-23 | 江苏金山环保工程有限公司 | Bucket grid flocculation device |
Non-Patent Citations (1)
| Title |
|---|
| 上海市政工程设计研究院: "《给水排水设计手册-第9册-专用机械》", 30 June 2000, 中国建筑工业出版社 * |
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