CN110950410A - Heavy medium coagulating sedimentation water treatment method - Google Patents
Heavy medium coagulating sedimentation water treatment method Download PDFInfo
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- CN110950410A CN110950410A CN201811129092.8A CN201811129092A CN110950410A CN 110950410 A CN110950410 A CN 110950410A CN 201811129092 A CN201811129092 A CN 201811129092A CN 110950410 A CN110950410 A CN 110950410A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000004062 sedimentation Methods 0.000 title claims abstract description 38
- 230000001112 coagulating effect Effects 0.000 title claims abstract description 26
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 94
- 238000003756 stirring Methods 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 54
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 47
- 239000002245 particle Substances 0.000 claims abstract description 37
- 239000000701 coagulant Substances 0.000 claims abstract description 25
- 239000002351 wastewater Substances 0.000 claims abstract description 23
- 239000008394 flocculating agent Substances 0.000 claims abstract description 16
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000010802 sludge Substances 0.000 claims abstract description 9
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 230000001376 precipitating effect Effects 0.000 claims abstract description 5
- 238000005345 coagulation Methods 0.000 claims description 10
- 230000015271 coagulation Effects 0.000 claims description 10
- 230000032683 aging Effects 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005189 flocculation Methods 0.000 abstract description 10
- 230000016615 flocculation Effects 0.000 abstract description 10
- 239000013589 supplement Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 6
- 239000006247 magnetic powder Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 3
- 230000003311 flocculating effect Effects 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention belongs to the technical field of water treatment, and provides a heavy medium coagulating sedimentation water treatment method which comprises the following steps: a) mixing the wastewater with a coagulant, and carrying out first stirring to obtain a first mixture; b) adding the dense medium particles into the first mixture, and carrying out second stirring to obtain a second mixture, wherein flocs taking the dense medium particles as cores are formed in the second mixture; c) adding a flocculating agent into the second mixture, and carrying out third stirring to further grow flocs to obtain a third mixture; d) curing the third mixture, and continuously increasing flocs; then, precipitating flocs by adopting an inclined tube precipitation method or an inclined plate precipitation method, collecting precipitates, centrifuging, and separating sludge and heavy medium particles; wherein the heavy medium particles are calcium carbonate; the energy density of the first stirring and the second stirring is greater than the energy density of the third stirring. The invention adopts calcium carbonate, can prevent the alkalinity of the wastewater to be treated from being too low, and integrates flocculation sedimentation and alkalinity supplement.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a heavy medium coagulating sedimentation water treatment method.
Background
The heavy medium coagulating sedimentation is a very fast coagulating sedimentation technology which is widely adopted in the domestic water treatment industry in recent years, after a coagulant is added, heavy medium particles (inert high-density microparticles) are added to serve as flocculating nuclei to increase the concentration of suspended matters in wastewater and accelerate the formation of flocs, and meanwhile, due to the ballast or weighting effect of the heavy medium particles, the sedimentation process is greatly accelerated to improve the effect of removing turbidity in water. At present, the heavy medium particles are divided into magnetic powder and non-magnetic powder, a magnetic coagulating sedimentation process for short for the magnetic powder is applied, and a micro-sand coagulating sedimentation process for the non-magnetic powder is applied. Compared with the traditional coagulating sedimentation process, the coagulating sedimentation process has the characteristics of high treatment speed, high efficiency, small occupied area, investment saving and the like.
Researches show that after a coagulant is added in the water treatment process, the alkalinity and the pH value of the wastewater to be treated are slightly reduced due to the hydrolysis of the cation of the coagulant. The pH value in the water treatment process is an important condition, and if the alkalinity of the wastewater to be treated is insufficient, the pH value can be greatly reduced, the coagulation condition is deteriorated, and the coagulation effect is influenced. Therefore, the pH value in the coagulation process is effectively and reasonably controlled, the coagulation effect can be improved, and the water quality is ensured. However, the current magnetic coagulation sedimentation process and the micro-sand coagulation sedimentation process cannot adjust the pH value of water.
In the existing water treatment process, the alkalinity of the wastewater to be treated is generally adjusted by adding caustic soda and lime after adding a coagulant. However, the alkalinity of the caustic soda and the lime is strong, so that the alkalinity of the wastewater to be treated is easily too high, the coagulation effect is also influenced by the too high alkalinity, the acid needs to be added in the later period to reduce the alkalinity, the operation is complicated, and the control is not easy; moreover, a corresponding adding system needs to be additionally arranged, and simultaneously, the caustic soda is expensive and the treatment cost is high.
Disclosure of Invention
The invention mainly aims to provide a heavy medium coagulating sedimentation water treatment method, and aims to solve the technical problems that the alkalinity of wastewater to be treated is not easy to control, the operation is complicated, the treatment cost is high and the like in the prior art.
The invention provides a heavy medium coagulating sedimentation water treatment method, which comprises the following steps:
a) mixing the wastewater with a coagulant, and carrying out first stirring to obtain a first mixture;
b) adding heavy medium particles into the first mixture, and carrying out second stirring to obtain a second mixture, wherein flocs taking the heavy medium particles as cores are formed in the second mixture;
c) adding the flocculating agent into the second mixture, and carrying out third stirring to further grow the flocs to obtain a third mixture;
d) aging the third mixture, wherein the flocs continue to grow; then, precipitating the flocs by adopting an inclined tube precipitation method or an inclined plate precipitation method, collecting precipitates, centrifuging, and separating sludge and the heavy medium particles;
wherein the heavy medium particles are calcium carbonate;
the energy density of the first stirring and the second stirring is greater than the energy density of the third stirring.
Compared with the prior art, the invention adopts calcium carbonate as dense medium particles to replace the traditional magnetic powder and micro-sand in the coagulation sedimentation water treatment process. Calcium carbonate is insoluble in aqueous solution, only a small amount of carbonate ions can be ionized, and carbonate is weak acid ions, and the hydrolysis degree of the carbonate ions in the aqueous solution is very small, so that after the calcium carbonate is put into the aqueous solution, the calcium carbonate can play a role in supplementing alkalinity and can prevent the alkalinity of wastewater to be treated from being too high. Therefore, the invention adopts calcium carbonate as heavy medium particles, so that the calcium carbonate can supplement alkalinity while serving as a flocculation core, and the invention integrates flocculation sedimentation and alkalinity supplement, has simpler and more convenient operation and reduces the treatment cost. Meanwhile, the process is optimized, so that the operation is simpler and more convenient, and the water treatment effect of the process is optimal under the comprehensive action of the coagulant, the calcium carbonate and the flocculant and in combination with the setting of the energy density of stirring.
Detailed Description
Aiming at solving the technical problems that the prior art is not easy to control the alkalinity of the wastewater to be treated, the operation is complicated, the treatment cost is high and the like. The embodiment of the invention provides a heavy medium coagulating sedimentation water treatment method, which integrates flocculating sedimentation and alkalinity supplement, is simple and optimized to operate and has lower treatment cost.
The invention relates to a heavy medium coagulating sedimentation water treatment method, which comprises the following steps:
a) mixing the wastewater with a coagulant, and carrying out first stirring to obtain a first mixture;
b) adding the dense medium particles into the first mixture, and carrying out second stirring to obtain a second mixture, wherein flocs taking the dense medium particles as cores are formed in the second mixture;
c) adding a flocculating agent into the second mixture, and carrying out third stirring to further grow flocs to obtain a third mixture;
d) curing the third mixture, and continuously increasing flocs; then, precipitating flocs by adopting an inclined tube precipitation method or an inclined plate precipitation method, collecting precipitates, centrifuging, and separating sludge and heavy medium particles;
wherein the heavy medium particles are calcium carbonate;
the energy density of the first stirring and the second stirring is greater than the energy density of the third stirring.
In the technical scheme, calcium carbonate is used as dense medium particles to replace traditional magnetic powder and micro-sand. Calcium carbonate is insoluble in aqueous solution, only a small amount of carbonate ions can be ionized, and carbonate is weak acid ions, and the hydrolysis degree of the carbonate ions in the aqueous solution is very small, so that after the calcium carbonate is put into the aqueous solution, the calcium carbonate can play a role in supplementing alkalinity and can prevent the alkalinity of wastewater to be treated from being too high. Therefore, the invention adopts calcium carbonate as heavy medium particles, so that the calcium carbonate can supplement alkalinity while being used as a flocculation core, and the invention integrates flocculation sedimentation and alkalinity supplement into a whole, thereby having simpler and more convenient operation.
The calcium carbonate has wide source, economic price, lower sludge amount, simplified later-stage recovery and treatment process and water treatment cost saving.
In the embodiment of the invention, the working concentration of the calcium carbonate is preferably 1000-5000 mg/L, and more preferably 3000-5000 mg/L. When the concentration is lower than 1000mg/L, the flocculation sedimentation speed is slow, and the alkalinity supplementing effect is poor; when the concentration is higher than 5000mg/L, heavy medium particle deposition is easy to occur, the requirement on stirring equipment is higher, and the alkalinity of the wastewater to be treated is slightly higher, so that the water treatment effect is influenced. Experimental results show that when the working concentration of calcium carbonate is 1000-5000 mg/L, the pH value is stabilized between 6-9, and the water purification treatment effect is optimal.
In the embodiment of the invention, the particle size of the calcium carbonate is 50-200 meshes. When the particle size of the calcium carbonate is smaller than 50 meshes and is too small, the calcium carbonate cannot exert the function of the flocculation core and is taken away by water flow, and the water treatment effect is poor; when the particle size of calcium carbonate is larger than 200 meshes, the sedimentation velocity of calcium carbonate in water is too high, the flocculation effect is poor, and the particle size of the calcium carbonate is possibly larger than the pipe diameter of a pump, so that the calcium carbonate is not beneficial to conveying.
In an embodiment of the present invention, the mixing includes: the waste water is mixed with coagulant, and when coagulant is added into the waste water, colloid in the waste water is destabilized and aggregated. The working concentration of the coagulant is preferably 30-100 mg/L, the working concentration of the coagulant is lower than 30mg/L, and the coagulation effect is poor; the working concentration of the coagulant is higher than 100mg/L, which causes coagulant waste and influences the alkalinity of water quality.
Further, the coagulant of the embodiment of the present invention is preferably an aluminum salt or an iron salt, and more preferably iron trichloride or PAC (polyaluminium chloride), iron sulfate, aluminum sulfate, polyferric sulfate, or alum.
In an embodiment of the invention, flocculation comprises: and adding a flocculating agent, wherein the working concentration of the flocculating agent is 0.3-1.5 mg/L. When the working concentration of the flocculating agent is lower than 0.3mg/L, the flocculating effect is poor; when the working concentration of the flocculant is higher than 1.5mg/L, the flocculant is wasted.
Further, the flocculant is an anionic high molecular flocculant, preferably Polyacrylamide (PAM).
Furthermore, when the molecular weight of the flocculating agent is more than 1000 million daltons, the adsorption and bridging capacity of the flocculating agent is stronger, and a better flocculation effect can be obtained.
In the embodiment of the present invention, the energy density of the first stirring and the second stirring is preferably 100 to 300W/m3. When the wastewater is mixed with coagulant and calcium carbonate, the energy density of stirring is lower than 100W/m3The stirring speed is too low, which is not beneficial to the uniform mixing of the wastewater, the coagulant and the calcium carbonate; when the energy density of stirring is more than 300W/m3Too high stirring speed is not favorable for the formation of flocs.
In the embodiment of the invention, the energy density of the third stirring is 30-80W/m3. After adding the flocculating agent, the flocs further grow, and when the energy density of stirring is lower than 30W/m3The stirring speed is too low, so that the flocculating agent is not favorably and uniformly distributed in the whole system; when the energy density of stirring is more than 80W/m3The stirring speed is too high, the formed floc structure is unstable, and the continuous growth of the floc is not facilitated.
In the embodiment of the present invention, the heavy medium coagulating sedimentation water treatment method specifically comprises:
a) mixing the waste water with a coagulant at an energy density of 100-150W/m3Carrying out first stirring, and hydraulically staying for 1-5 min to obtain a first mixture; the working concentration of the coagulant is 50-90 mg/L;
b) adding calcium carbonate into the first mixture to obtain a mixture with an energy density of 100-150W/m3Performing second stirring, and performing hydraulic retention for 1-5 min to obtain a second mixture, wherein the second mixture isForming floc with calcium carbonate as core; the working concentration of the calcium carbonate is 3000-5000 mg/L;
c) adding a flocculating agent into the second mixture, wherein the energy density is 30-100W/m3Carrying out third stirring, and staying for 8-15 min by waterpower to further grow flocs to obtain a third mixture; the working concentration of the flocculating agent is 0.3-1.5 mg/L;
d) curing the third mixture, and continuously increasing flocs; then, the floc is precipitated by adopting an inclined tube precipitation method or an inclined plate precipitation method, and the precipitate is collected and centrifuged to separate the sludge and the calcium carbonate.
By further optimizing and processing the condition parameters of the heavy medium coagulating sedimentation water treatment method provided by the embodiment of the invention, the water quality after processing is better.
Further, the separation in the step d) adopts a hydrocyclone. The hydrocyclone is a classification device for accelerating the sedimentation of ore particles by utilizing centrifugal force, and has the advantages of small floor area, low price, large treatment capacity and the like. The embodiment of the invention separates the sludge and the calcium carbonate particles through the hydrocyclone, is convenient for recycling the calcium carbonate particles and further saves the water treatment cost.
Through field pilot test, the embodiment of the invention adopts calcium carbonate as heavy medium particles, and the precipitation speed and the recovery rate of the heavy medium particles are close to those of the existing magnetic and sand coagulating sedimentation process; moreover, the alkalinity can be supplemented by 30-300 mg/L; meanwhile, the floc with calcium carbonate as the core can adsorb and remove humus in water to a certain extent.
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a heavy medium coagulating sedimentation water treatment method, which comprises the following steps:
1) mixing the wastewater with a coagulant, and carrying out first stirring for 3min to obtain a first mixture;
2) adding calcium carbonate into the first mixture, and carrying out second stirring for 3min to obtain a second mixture, wherein flocs taking the dense medium particles as cores are formed in the second mixture;
3) adding a flocculating agent into the second mixture, and carrying out third stirring for 8-10 min to further grow flocs to obtain a third mixture;
4) curing the third mixture, and continuously increasing flocs; then, precipitating flocs by adopting an inclined tube precipitation method or an inclined plate precipitation method, collecting precipitates, centrifuging, and separating sludge and heavy medium particles;
wherein the energy density of the first stirring and the second stirring is greater than the energy density of the third stirring.
In this example, the particle size of calcium carbonate is 120 mesh; in the second mixture, the concentration of calcium carbonate was 3000 mg/L.
The coagulant was selected to be PAC, the concentration of PAC in the first mixture being 70 mg/L.
The flocculant is selected to be PAM, and the concentration of the flocculant in the third mixture is 0.5 mg/L.
In the step 1), the energy density of the first stirring is 100-150W/m3。
In the step 2), the energy density of the second stirring is 100-150W/m3。
In the step 3), the energy density of the third stirring is 30-60W/m3。
In step 4), the centrifugation is carried out in a hydrocyclone.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A heavy medium coagulating sedimentation water treatment method is characterized by comprising the following steps:
a) mixing the wastewater with a coagulant, and carrying out first stirring to obtain a first mixture;
b) adding heavy medium particles into the first mixture, and carrying out second stirring to obtain a second mixture, wherein flocs taking the heavy medium particles as cores are formed in the second mixture;
c) adding the flocculating agent into the second mixture, and carrying out third stirring to further grow the flocs to obtain a third mixture;
d) aging the third mixture, wherein the flocs continue to grow; then, precipitating the flocs by adopting an inclined tube precipitation method or an inclined plate precipitation method, collecting precipitates, centrifuging, and separating sludge and the heavy medium particles;
wherein the heavy medium particles are calcium carbonate;
the energy density of the first stirring and the second stirring is greater than the energy density of the third stirring.
2. The heavy medium coagulating sedimentation water treatment method according to claim 1, wherein the working concentration of the calcium carbonate is 1000 to 5000 mg/L.
3. The heavy-medium coagulating sedimentation water treatment method according to claim 1, wherein the particle size of the calcium carbonate is 50 to 200 meshes.
4. The heavy medium coagulation sedimentation water treatment method according to claim 1, wherein the working concentration of the coagulant is 30 to 100 mg/L.
5. The heavy medium coagulating sedimentation water treatment method according to claim 1, wherein the working concentration of the flocculating agent is 0.3-1.5 mg/L;
the flocculant is an anionic high-molecular flocculant.
6. The heavy medium coagulating sedimentation water treatment method according to claim 1, wherein the energy density of the first stirring and the second stirring is 100 to 300W/m3。
7. According toThe heavy medium coagulating sedimentation water treatment method as claimed in claim 1, wherein the energy density of the third stirring is 30 to 80W/m3。
8. The heavy medium coagulating sedimentation water treatment method according to any one of claims 1 to 7, characterized by comprising:
a) mixing the wastewater with the coagulant at an energy density of 100-150W/m3Carrying out first stirring, and hydraulically staying for 1-5 min to obtain a first mixture; the working concentration of the coagulant is 50-90 mg/L;
b) adding the calcium carbonate into the first mixture to obtain a mixture with an energy density of 100-150W/m3Performing second stirring, and performing hydraulic retention for 1-5 min to obtain a second mixture, wherein flocs taking calcium carbonate as a core are formed in the second mixture; the working concentration of the calcium carbonate is 3000-5000 mg/L;
c) adding the flocculating agent into the second mixture, wherein the energy density is 30-100W/m3Carrying out third stirring, and hydraulically staying for 8-15 min to further grow the flocs to obtain a third mixture; the working concentration of the flocculant is 0.3-1.5 mg/L;
d) aging the third mixture, wherein the flocs continue to grow; then, the floc is precipitated by adopting an inclined tube precipitation method or an inclined plate precipitation method, and the precipitate is collected and centrifuged to separate the sludge and the calcium carbonate.
9. The heavy medium coagulating sedimentation water treatment method according to claim 8, wherein the separation of step d) employs a hydrocyclone.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113104943A (en) * | 2021-04-15 | 2021-07-13 | 张婉琴 | Emergency treatment method for sudden coal water slurry pollution accident of riverway |
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| CN1526662A (en) * | 2003-03-04 | 2004-09-08 | 上海焦化有限公司 | Softening and coagulating treatment process of gas scrubbing water |
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Application publication date: 20200403 |