CN114180689A - Magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse - Google Patents
Magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse Download PDFInfo
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- 238000005345 coagulation Methods 0.000 title claims abstract description 70
- 230000015271 coagulation Effects 0.000 title claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000000926 separation method Methods 0.000 title claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 25
- 239000010802 sludge Substances 0.000 claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 239000000701 coagulant Substances 0.000 claims abstract description 35
- 238000011084 recovery Methods 0.000 claims abstract description 30
- 239000010865 sewage Substances 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000004062 sedimentation Methods 0.000 claims abstract description 15
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 238000001935 peptisation Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 64
- 239000002585 base Substances 0.000 claims description 9
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims 1
- 239000013589 supplement Substances 0.000 claims 1
- 238000005189 flocculation Methods 0.000 description 17
- 230000016615 flocculation Effects 0.000 description 16
- 239000000084 colloidal system Substances 0.000 description 6
- 239000003814 drug Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000007885 magnetic separation Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000002352 surface water Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000721671 Ludwigia Species 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 241000894007 species Species 0.000 description 2
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- 241000196324 Embryophyta Species 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004090 dissolution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
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- 239000010841 municipal wastewater Substances 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
本发明公开了一种原位磁种分离回用的磁混凝水处理方法，采用反应池进行以下步骤：向反应池中注入污水，投入磁种、混凝剂和助凝剂进行磁混凝处理；磁混凝处理结束后，开启泥斗底部的电磁铁，经静沉后排出处理后的污水，然后检测泥斗中污泥的浓度；若污泥浓度小于设定阈值，则重复前述步骤再次注入污水进行磁混凝处理，处理过程中不需投加磁种；若污泥浓度大于等于设定阈值，则通过调整pH值、解絮、磁泥分离和排泥进行原位磁种分离回收，然后再重复前述步骤再次注入污水进行磁混凝处理，处理过程中根据磁种回收时的损失量，同步补充磁种。本发明提供的原位磁种分离回用的磁混凝水处理方法，工艺流程短，污水处理效率高，设备简单，运行成本低。
The invention discloses a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse. A reaction pool is used to perform the following steps: inject sewage into the reaction pool, put in magnetic seeds, a coagulant and a coagulant aid for magnetic coagulation Treatment; after the magnetic coagulation treatment is completed, turn on the electromagnet at the bottom of the mud hopper, discharge the treated sewage after static sedimentation, and then detect the concentration of the sludge in the mud hopper; if the sludge concentration is less than the set threshold, repeat the above steps Inject the sewage again for magnetic coagulation treatment, without adding magnetic seeds during the treatment process; if the sludge concentration is greater than or equal to the set threshold, in-situ magnetic seed separation is performed by adjusting the pH value, deflocculation, magnetic mud separation and sludge discharge Recycle, and then repeat the above steps to inject sewage again for magnetic coagulation treatment. During the treatment process, the magnetic seeds are supplemented synchronously according to the loss of the magnetic seeds during recovery. The magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse provided by the invention has the advantages of short technological process, high sewage treatment efficiency, simple equipment and low operation cost.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a magnetic coagulation water treatment method for separating and recycling in-situ magnetic seeds.
Background
The magnetic coagulation process is a new technology which is highlighted by much attention in the field of water treatment at present. The magnetic separation technology is combined with the conventional flocculation technology, magnetic seeds are added in the flocculation process, the double actions of a coagulant and the magnetic seeds are utilized to enable insoluble colloid and suspended substances in water to form high-density magnetic flocs, and then the high-speed precipitation separation of the flocs is realized by utilizing the self gravity or an external magnetic field. In recent years, the magnetic coagulation process is more and more widely applied to water treatment scenes which need high load and quick emergency, such as black and odorous water treatment, sewage plant upgrading transformation, industrial wastewater treatment and the like.
The existing magnetic coagulation process mainly comprises two parts of magnetic coagulation sedimentation and magnetic seed recovery. The main process of water purification in the magnetic coagulation sedimentation process generally adopts a continuous flow mode to operate, is basically consistent with the conventional coagulation sedimentation process, and comprises the steps of dosing mixing, multistage mechanical flocculation, sedimentation and the like, and is mainly characterized in that the dosing step is added with the addition of magnetic seeds (generally magnetite powder) and the optimal hydraulic stirring conditions in the mechanical flocculation step are different.
In order to reduce the cost of the medicament for process operation, magnetic coagulation sedimentation is carried out, and meanwhile, magnetic species in the sediment sludge floc generated by the magnetic coagulation sedimentation need to be recovered. The magnetic seed recovery process comprises the unit links of magnetic mud flocculation decomposition, magnetic seed separation recovery, magnetic seed recovery reflux flocculation tank addition and the like. The common magnetic sludge flocculation breaking link generally adopts a high-speed shearing machine to perform mechanical crushing and dispersion on magnetic sludge, the magnetic seed separation and recovery link generally adopts special magnetic separation devices such as a magnetic drum or a magnetic roller to adsorb magnetic seeds in the flocculated sludge, and the magnetic seed reflux link generally adopts a sludge pump and a conveying pipeline to reflux the magnetic seeds to the flocculation device. The magnetic coagulation and magnetic seed recovery method has the problems of long process flow, complex and various equipment, high operation energy consumption, poor practicability and the like, and influences the practical popularization and application of the process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a magnetic coagulation water treatment method for separating and recycling in-situ magnetic species, which has the advantages of short process flow, high sewage treatment efficiency, simple equipment and low operation cost.
The invention provides the following technical scheme:
a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse adopts a reaction tank for water treatment, wherein the reaction tank comprises a reaction cylinder and a mud bucket which are connected up and down, the bottom of the mud bucket is provided with an electromagnet, and the water treatment method comprises the following steps:
injecting sewage to be treated into the reaction tank, adjusting the pH value, and then sequentially adding magnetic seeds, a coagulant and a coagulant aid under the stirring condition for magnetic coagulation treatment;
after the magnetic coagulation treatment is finished, stopping stirring, starting an electromagnet at the bottom of the mud bucket, discharging the treated sewage after static sedimentation, and then detecting the concentration of the sludge in the mud bucket;
if the sludge concentration is less than the set threshold value, repeating the steps and injecting the sewage again for magnetic coagulation treatment, wherein the treatment process does not need to add magnetic seeds;
if the sludge concentration is more than or equal to the set threshold value, carrying out in-situ magnetic seed separation and recovery by adjusting the pH value, carrying out flocculation decomposition, carrying out magnetic sludge separation and sludge discharge, then repeating the steps, injecting sewage again for carrying out magnetic coagulation treatment, and synchronously supplementing magnetic seeds according to the loss amount during magnetic seed recovery in the treatment process.
Further, after the sewage to be treated is injected into the reaction tank, the stirring speed is set to be 300-500 r/min, the pH value of the sewage is monitored, the addition of an acid-base regulator is controlled, and the pH is adjusted to be 6.5-7.5.
Further, under the stirring condition of 300-500 r/min, adding the magnetic seeds and the aluminum coagulant into the reaction tank, and stirring for 0.5-1 min; adding a coagulant aid into the reaction tank under the stirring condition of 100-150 r/min, and stirring for 2-4 min; and finally, stirring for 5-10 min under the stirring condition of 50-80 r/min for magnetic coagulation treatment.
Further, the magnetic seeds are magnetite powder with the particle size of 300-800 meshes, and the magnetite powder is added or supplemented according to the concentration of 50-300 mg/L of a coagulation system.
Further, the coagulant is polyaluminium chloride and is added according to the concentration of a coagulation system of 30-150 mg/L.
Further, the coagulant aid is polyacrylamide and is added according to 0.1-1% of the addition amount of the coagulant.
Further, when the pH value is adjusted through magnetic seed separation and recovery, the stirring speed is 300-500 r/min, and the pH value of the sludge is adjusted to be 8.5-9.5 by monitoring the pH value of the sludge in the hopper and controlling the addition of alkali liquor.
Further, the method for deflocculating comprises the following steps: stirring at a speed of 300-500 r/min for 5-10 min to dissolve insoluble aluminum salt colloid substances contained in the magnetic flocs and disintegrate the magnetic flocs to disperse the magnetic seeds and the sludge.
Further, the method for separating the magnetic mud comprises the following steps: and (3) starting an electromagnet at the bottom of the mud bucket, stirring for 1-2 min at the speed of 100-150 r/min, then stirring for 1-2 min at the speed of 50-80 r/min, then stopping stirring, and statically settling for 1-2 min to enable the magnetic seeds after flocculation removal to settle and be firmly adsorbed on the bottom surface of the mud bucket.
Further, install the mixer that is used for the stirring in the reaction tank, the reaction cylinder is connected with the medicament case that is used for storing magnetism kind, coagulant aid and acid-base adjusting agent, be equipped with the mud concentration apparatus that is arranged in monitoring pH value's pH meter and is arranged in detecting mud bucket mud concentration in the mud bucket, the mud bucket lower part is equipped with the mud pipe that is used for the row mud.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts the intermittent reactor to operate, and the magnetic coagulation stage has no inflow and outflow disturbance, stable flocculation effect, rapid floc sedimentation and good effluent quality; the magnetic seed separation and recovery process can be completed in situ in the same reaction tank without complex facilities and pipeline systems, the equipment is simple, the occupied area is small, the operation energy consumption is low, the magnetic seed recovery rate is high, and the medicament consumption is low;
(2) the method can be carried out by adopting a mode of multi-round magnetic coagulation treatment and one round of magnetic seed separation and recovery, and under the condition that the sludge concentration is less than a set threshold value, magnetic flocs formed after each round of magnetic coagulation treatment are directly and repeatedly used for the next round of magnetic coagulation treatment; on the first hand, the coagulation system can keep the floc content with higher concentration, a compact high-concentration sludge layer is formed in the flocculation and sedimentation processes, and colloid and suspended particles in water are captured by utilizing the contact flocculation effect of the high-concentration sludge layer, so that the treatment effect is improved; in the second aspect, the magnetic seeds in the magnetic flocs are directly utilized for lower-round magnetic coagulation, so that frequent addition of the magnetic seeds is not needed, and the process and facilities are simplified; in the third aspect, the recycling of the magnetic flocs can also fully utilize the flocculant which is not utilized in the coagulation of the upper wheel, so that the adding amount of the flocculant is saved; compared with the prior art, the invention simplifies the operation process and equipment, improves the sewage treatment efficiency, reduces the coagulant dosage and saves the operation cost;
(3) the method adopts the aluminum flocculant, and realizes the optimal coagulation effect and the in-situ magnetic seed separation and recovery through the accurate pH control in the magnetic coagulation and magnetic seed separation and recovery stages; during magnetic coagulation, an insoluble colloidal substance with high polymerization degree formed by aluminum salt under a neutral condition is used as a floc framework to form magnetic flocs together with magnetic seeds and impurities in water, and the aluminum salt magnetic flocs have the characteristics of high forming speed, large and compact flocs and good raw water quality adaptability; during magnetic seed recovery, the characteristic of alkaline dissolution of insoluble aluminum salt colloid is utilized, under the condition of alkalescence (pH is 8.5-9.5), the aluminum salt colloid framework in the magnetic floc is dissolved, and the disintegration of the magnetic floc is realized by combining the means of hydraulic stirring and shearing; then, in a magnetic separation mode of magnetic seeds and a mode of stirring, suspending, dispersing and discharging flocs are assisted, and finally, in-situ magnetic seed recovery and sludge discharge at a lower energy consumption level are achieved; compared with the prior art, the magnetic seed separation and recovery process does not need a special high-power high-speed shearing machine and a complex magnetic mud recovery and reflux system, greatly simplifies the process flow and reduces the operation energy consumption.
Drawings
FIG. 1 is a schematic view of the structure of a reaction cell in the present invention;
FIG. 2 is a process flow diagram of water treatment according to the present invention;
labeled as: 1. a water inlet pump; 2. a blender; 3. a kit; 301. a magnetic seed box; 302. a coagulant tank; 303. a coagulant aid tank; 304. an acid-base regulator box; 4. a low level sensor; 5. decanting device; 6. a water outlet electromagnetic valve; 7. a pH meter; 8. a sludge concentration measuring instrument; 9. an electromagnet; 10. a sludge discharge electromagnetic valve; 11. a water outlet hose of the decanter; 12. a decanter guide rail; 13. a high level sensor; 14. a reaction cylinder; 15. a mud bucket; 16. a water inlet pipe; 17. a water outlet pipe; 18. a sludge discharge pipe.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse, which adopts a reaction tank for water treatment, wherein a stirrer 2 for stirring is installed in the reaction tank; the reaction tank comprises a reaction cylinder 14 and a mud bucket 15 which are connected up and down, the reaction cylinder 14 is a cylindrical or prismatic cylinder body and is convenient for flocculation and sedimentation, and the mud bucket 15 is in a circular truncated cone shape or a prismatic truncated cone shape and is convenient for sludge collection and concentration. The reaction cylinder 14 is connected with a medicament box 3, and the medicament box 3 comprises a magnetic seed box 301, a coagulant box 302, a coagulant aid box 303 and an acid-base regulator box 304 which respectively contain magnetic seeds, a coagulant aid and an acid-base regulator. Be equipped with the mud concentration apparatus 8 that is arranged in monitoring pH value's pH meter 7 and is arranged in detecting mud concentration in the mud bucket 15, mud bucket 15 lower part is equipped with the mud pipe 18 that is used for the mud discharge, and mud bucket 15 bottom is equipped with electro-magnet 9, and electro-magnet 9 circular telegram has magnetism when opening, does not have magnetism when the outage is closed.
The upper part of the reaction tank is provided with a water inlet pipe 16, and the water inlet pipe 16 is connected with a water inlet pump 1; the lower part of the reaction tank is provided with a water outlet pipe 17, and the water outlet pipe 17 is connected with a water outlet electromagnetic valve 6; the sludge discharge pipe 18 is connected with a sludge discharge electromagnetic valve 10. The upper part and the lower part of the reaction tank are respectively provided with a high liquid level sensor 13 and a low liquid level sensor 4 which are respectively used for monitoring the highest water level and the lowest water level. A decanter guide rail 12 which is vertically arranged is arranged in the reaction tank, a decanter 5 which can move along the decanter guide rail 12 is arranged on the decanter guide rail 12, the decanter 5 is connected with a water outlet pipe 17 through a decanter water hose 11, and the decanter 5 can float on the water surface and move down along the decanter guide rail 12 along with the falling of the water surface.
The magnetic coagulation water treatment method for separating and recycling the in-situ magnetic seeds provided by the embodiment comprises the following steps:
1. magnetic coagulation treatment
(1.1) water inflow: and starting the water inlet pump 1, injecting the sewage to be treated into the reaction tank from the water inlet pipe 16, and when the water level in the tank is monitored by the high liquid level sensor 13 to reach the highest liquid level, triggering the water inlet pump 1 to be closed, and finishing water inlet.
(1.2) adjusting pH: starting the stirrer 2, rapidly stirring at a rotating speed of 300-500 r/min, monitoring the pH value of the sewage through a pH meter 7, controlling the chemical box 3 to add an acid-base regulator, and adjusting the pH value to be within a range of 6.5-7.5.
(1.3) adding medicine for flocculation: the stirrer 2 is used for quickly stirring at the rotating speed of 300-500 r/min, the chemical box 3 is controlled to add magnetic seeds and an aluminum coagulant into the reaction tank, the magnetic seeds are magnetite powder with the particle size of 300-800 meshes, the magnetite powder is added or supplemented according to the concentration of a coagulation system of 50-300 mg/L, the aluminum coagulant is polyaluminium chloride, the polyaluminium chloride is added according to the concentration of the coagulation system of 30-150 mg/L, and the stirring time is 0.5-1 min; stirring at a medium speed of 100-150 r/min by a stirrer 2, controlling a chemical tank 3 to add a coagulant aid into the reaction tank, wherein the coagulant aid is polyacrylamide, and adding the polyacrylamide according to 0.1-1% of the addition of the coagulant, and stirring for 2-4 min; the stirrer 2 is slowly stirred at a rotating speed of 50-80 r/min, and magnetic coagulation treatment is carried out for 5-10 min.
(1.4) precipitation: after the magnetic coagulation is finished, the stirrer 2 is closed, the electromagnet 9 at the bottom of the mud bucket 15 is started, so that the magnetic flocs formed in the magnetic coagulation are rapidly settled, and the static settling time is 3-5 min;
(1.5) water outlet: after the static sedimentation is finished, the water outlet electromagnetic valve 6 is opened, and water in the reaction tank is discharged from top to bottom through the float type decanter 5, the decanter water outlet hose 11 and the water outlet pipe 17; in the process of water level descending, the decanter 5 moves along the decanter guide rail 12, when the water level is reduced to the lowest liquid level, the low liquid level sensor 4 triggers the water outlet electromagnetic valve 6 to close, water outlet is finished, and the electromagnet 9 at the bottom of the reaction tank is synchronously closed.
(1.6) sludge concentration detection: starting the stirrer 2, rapidly stirring at a rotating speed of 300-500 r/min, and detecting the sludge concentration in the reaction tank mud bucket 15 by using a sludge concentration tester 8; if the sludge concentration is less than the set threshold value, repeating the step 1 to carry out magnetic coagulation treatment, and (1.3) adding no magnetic seeds; if the sludge concentration is more than or equal to the set threshold value, the device enters a working stage of magnetic seed separation and recovery (step 2). The sludge concentration threshold in this step is set to 4000-8000 mg/L.
2. Magnetic seed separation and recovery
(2.1) adjusting the pH value: starting the stirrer 2, rapidly stirring at a rotating speed of 300-500 r/min, monitoring the pH value of sludge in the hopper through a pH meter 7, controlling the agent box 3 to add an acid-base regulator, and regulating the pH value of the sludge to 8.5-9.5.
(2.2) deflocculating: the stirrer 2 rapidly stirs for 5-10 min at a rotation speed of 300-500 r/min to dissolve the insoluble aluminum salt colloid substance contained in the magnetic flocs and disintegrate the magnetic flocs to disperse the magnetic seeds and the sludge.
(2.3) magnetic mud separation: and (3) starting an electromagnet at the bottom of the mud bucket 15, stirring at a rotating speed of 100-150 r/min for 1-2 min, then stirring at a rotating speed of 50-80 r/min for 1-2 min at a low speed, then closing the stirrer 2, and statically settling for 1-2 min to enable the magnetic seeds after deflocculation to settle and be firmly adsorbed on the bottom surface of the mud bucket 15.
(2.4) sludge discharge: the stirrer 2 is used for stirring at a low speed of 50-80 r/min, the sludge discharge electromagnetic valve 10 is synchronously opened, sludge in the sludge hopper 15 is discharged from the sludge discharge pipe 18, after the sludge discharge is finished, the sludge discharge electromagnetic valve 10 is closed, and the electromagnet 9 at the bottom of the reaction tank is closed.
In this case, the process may be resumed in step 1 to perform magnetic coagulation treatment, and in step (1.3), the magnetic seeds may be replenished in synchronization with the loss during magnetic seed recovery.
Example 2
The method in example 1 is adopted to treat the surface water of a mild black and odorous river, and the main operating parameters and processes are as follows:
magnetic coagulation treatment stage: adjusting the pH value to 7.0; the magnetic seed, coagulant and coagulant aid are 500-mesh ferroferric oxide magnetic powder, polyaluminium chloride and polyacrylamide respectively; the concentrations of the three components in a magnetic coagulation reaction system are respectively 150mg/L, 50mg/L and 0.1 mg/L; the fast, medium and slow stirring speeds are respectively 500r/min, 150r/min and 80 r/min; the fast stirring time, the medium stirring time, the slow stirring time and the static settling time are respectively 0.5min, 2min, 5min and 3 min; setting the volume of discharged water after static sedimentation to be 80% of the volume of the reaction tank, setting the sludge concentration threshold value in the mud bucket to be 6000mg/L, and entering a magnetic separation and recovery stage after 10 continuous running of the magnetic coagulation treatment step.
And (3) magnetic seed separation and recovery stage: adjusting the pH value to 9.0; when the flocculation is released, the rapid stirring speed is respectively 500r/min, and the rapid stirring time is 5 min; when magnetic mud is separated, the medium-speed stirring speed and the slow-speed stirring speed are respectively 150r/min and 80r/min, and the medium-speed stirring time, the slow-speed stirring time and the static settling time are respectively 1min, 1min and 1 min; when sludge is discharged, the volume of the discharged sludge is 15 percent of the volume of the reaction tank (namely 75 percent of the volume of the sludge in the sludge bucket), and the recovery rate of the magnetic seeds is 99.1 percent.
Before and after treatment, indexes such as turbidity, COD, ammonia nitrogen, total phosphorus and the like and removal rate are shown in Table 1. It can be seen that the effluent quality can reach better after the treatment by the technology, COD and total phosphorus can reach the III-class water standard in the quality standard of surface water environment (GB 3838-.
TABLE 1 surface Water treatment Effect of a slightly black and odorous river
Example 3
The method in the embodiment 1 is adopted to treat the biochemical secondary effluent of a certain urban sewage treatment plant, and the main operation parameters and the process are as follows:
magnetic coagulation treatment stage: adjusting the pH value to 7.2; the magnetic seed, coagulant and coagulant aid are 500-mesh ferroferric oxide magnetic powder, polyaluminium chloride and polyacrylamide respectively; the concentrations of the three components in a magnetic coagulation reaction system are respectively 200mg/L, 80mg/L and 0.2 mg/L; the fast, medium and slow stirring speeds are respectively 500r/min, 150r/min and 80 r/min; the fast stirring time, the medium stirring time, the slow stirring time and the static settling time are respectively 1min, 3min, 8min and 5 min; setting the volume of discharged water after static sedimentation to be 80% of the volume of the reaction tank, setting the sludge concentration threshold value in the mud bucket to be 4500mg/L, and entering a magnetic separation and recovery stage after 6 rounds of continuous operation of the magnetic coagulation treatment step.
And (3) magnetic seed separation and recovery stage: adjusting the pH value to 9.0; when the flocculation is released, the rapid stirring speed is 300r/min and the rapid stirring time is 8 min; when magnetic mud is separated, the medium-speed stirring speed and the slow-speed stirring speed are respectively 120r/min and 60r/min, and the medium-speed stirring time, the slow-speed stirring time and the static settling time are respectively 1min, 1min and 1 min; when sludge is discharged, the volume of the discharged sludge is 15 percent of the volume of the reaction tank (namely 75 percent of the volume of the sludge in the sludge bucket), and the recovery rate of the magnetic seeds is 98.7 percent.
Before and after treatment, the indexes of suspended solid concentration SS, COD, total nitrogen, total phosphorus and the like and the removal rate are shown in Table 2. It can be seen that the water treated by the technology can reach better effluent quality. According to the discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-.
TABLE 2 Secondary Biochemical effluent treatment effect of certain urban sewage treatment plant
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115231762A (en) * | 2022-07-15 | 2022-10-25 | 中建环能科技股份有限公司 | Control method based on magnetic coagulation water treatment system |
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