CN107324465A - A kind of integrated Waste Water Treatment of magnetic-coagulation and method - Google Patents
A kind of integrated Waste Water Treatment of magnetic-coagulation and method Download PDFInfo
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- CN107324465A CN107324465A CN201710605516.2A CN201710605516A CN107324465A CN 107324465 A CN107324465 A CN 107324465A CN 201710605516 A CN201710605516 A CN 201710605516A CN 107324465 A CN107324465 A CN 107324465A
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- 238000005345 coagulation Methods 0.000 title claims abstract description 95
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title description 26
- 238000004062 sedimentation Methods 0.000 claims abstract description 126
- 230000005291 magnetic effect Effects 0.000 claims abstract description 98
- 239000000701 coagulant Substances 0.000 claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000002351 wastewater Substances 0.000 claims abstract description 59
- 239000003814 drug Substances 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 239000008213 purified water Substances 0.000 claims abstract description 9
- 239000006247 magnetic powder Substances 0.000 claims description 108
- 230000015271 coagulation Effects 0.000 claims description 92
- 239000010802 sludge Substances 0.000 claims description 81
- 238000011282 treatment Methods 0.000 claims description 22
- 239000006148 magnetic separator Substances 0.000 claims description 16
- 238000010008 shearing Methods 0.000 claims description 12
- 230000014759 maintenance of location Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 229940079593 drug Drugs 0.000 claims description 7
- 230000002572 peristaltic effect Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims 2
- 230000003311 flocculating effect Effects 0.000 claims 2
- 239000000126 substance Substances 0.000 abstract description 7
- 238000005189 flocculation Methods 0.000 abstract description 5
- 230000016615 flocculation Effects 0.000 abstract description 5
- 239000010865 sewage Substances 0.000 abstract description 4
- 239000000725 suspension Substances 0.000 abstract 2
- 239000002244 precipitate Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 20
- 238000005192 partition Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 12
- 229920002401 polyacrylamide Polymers 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- 230000009471 action Effects 0.000 description 6
- 239000008394 flocculating agent Substances 0.000 description 5
- 239000010801 sewage sludge Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011369 optimal treatment Methods 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003911 water pollution Methods 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
- C02F1/5281—Installations for water purification using chemical 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
- C02F1/48—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
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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)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of integrated Waste Water Treatment of magnetic-coagulation, including water inlet pipe, chemicals dosing plant, magnetic adding apparatus, reaction tank, sedimentation basin；Water inlet pipe, chemicals dosing plant and magnetic adding apparatus are connected with reaction tank respectively, and waste water, medicament, magnetic are added thereto；Reaction tank is arranged at the top in sedimentation basin, for carrying out magnetic-coagulation processing to waste water；Sedimentation basin, the waste water for receiving reaction tank output precipitates suspension floccule body therein and exports purified water, the suspension floccule body precipitated is discharged by sludge-discharge pipe road.Reaction tank is combined together by the present invention with sedimentation basin, waste water can not only quickly and stably be handled, and eliminate single coagulant, flocculation aid stirring pool, floor space significantly reduces, loss of the magnetic in different ponds is avoided, while also improving removal efficiency, corollary equipment and energy resource consumption is saved, reducing the cost of sewage disposal can be widely used among cell, solve cell problem of water consumption.
Description
Technical Field
The invention relates to a novel magnetic coagulation integrated wastewater treatment system and method, and belongs to the technical field of wastewater treatment.
Background
The urban water consumption is increased, the water pollution problem is increasingly aggravated, and the economic development is severely restricted. The development of the wastewater treatment process is enhanced, the polluted fresh water resource can be effectively utilized, and the environmental pressure and the economic pressure are relieved. The small-scale water supply quantity of the city changes frequently, the regulation volume of the clean water tank is large, and the condition that the quality of the outlet water is difficult to guarantee exists in the intermittent operation.
The magnetic coagulation sedimentation technology is that magnetic powder is synchronously added in a common coagulation sedimentation process to be combined with pollutants into a whole by flocculation so as to enhance the coagulation and flocculation effects and ensure that the generated floc has higher density and stronger performance, thereby achieving the purpose of high-speed sedimentation, and the magnetic powder can be recycled by a magnetic drum. The retention time of the whole magnetic coagulation process is very short, so that the probability of a reverse dissolution process of most pollutants including TP (total phosphorus) is very small, and in addition, magnetic powder and flocculating agent added in the system have good adsorption effects on bacteria, viruses, oil and various micro particles, so that the removal effect on the pollutants is better than that of the traditional coagulation process. In order to improve the treatment effect of coagulation after the coagulant and the flocculant are uniformly distributed in water, the coagulant and the flocculant are usually added into different tanks in the prior art, so that a common magnetic coagulation system is provided with an independent coagulant adding tank, a flocculant adding tank and a magnetic powder adding tank, but the magnetic coagulation treatment process is complicated, and the occupied area is still large.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a magnetic coagulation integrated wastewater treatment system and a method, the system combines a reaction tank and a sedimentation tank together, wherein the reaction tank is a place for magnetic coagulation reaction, the magnetic coagulation reaction is realized by adding magnetic powder in the conventional coagulation process, the magnetic powder is used for enhancing the interaction force and collision frequency among particles to accelerate the formation of flocs, the flocs with larger volume and higher density are formed, the sedimentation is accelerated, and the removal efficiency of pollutants is improved; the system can stably and quickly treat the wastewater, and has small floor area and short construction period.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetic coagulation integrated wastewater treatment system comprises a water inlet pipe, a dosing device, a magnetic powder adding device, a reaction tank and a sedimentation tank; wherein,
the water inlet pipe, the dosing device and the magnetic powder adding device are respectively communicated with the reaction tank and used for adding wastewater, a medicament and magnetic powder into the reaction tank;
the reaction tank is arranged at the upper part in the sedimentation tank and is used for receiving the wastewater, the medicament and the magnetic powder and carrying out magnetic coagulation treatment on the wastewater;
the sedimentation tank comprises a sedimentation tank body and a sludge hopper arranged at the lower part of the sedimentation tank body, wherein the sedimentation tank body is communicated with the reaction tank and is used for receiving the wastewater output by the reaction tank, settling suspended matters in the wastewater and outputting purified water; the sludge hopper is used for receiving and gathering suspended matters precipitated in the sedimentation tank body and discharging the suspended matters through a sludge discharge pipeline communicated with the sludge hopper.
As a preferred embodiment, the magnetic coagulation integrated wastewater treatment system further includes: a sludge pump; the sludge pump is arranged on the sludge discharge pipeline and is used for conveying sludge discharged from the sedimentation tank.
As a preferred embodiment, the magnetic coagulation integrated wastewater treatment system further includes: the high-speed shearing machine is connected with the sludge discharge pipeline and is used for crushing sludge discharged from the sedimentation tank; the magnetic separator is connected with the sludge discharge pipeline, is arranged behind the high-speed shearing machine and is used for separating and recovering magnetic powder from the crushed sludge; preferably, the magnetic separator is communicated with the reaction tank or the magnetic powder adding device, and the separated magnetic powder is conveyed to the reaction tank or the magnetic powder adding device.
In the above magnetic coagulation integrated wastewater treatment system, as a preferred embodiment, a stirring device is arranged in the reaction tank; the coagulant adding device comprises a coagulant adding device and a coagulant aid adding device, wherein the coagulant adding device comprises a coagulant dosing tank and a coagulant aid storage tank, the coagulant aid adding device comprises a coagulant aid dosing tank and a coagulant aid storage tank, and the coagulant adding device and the coagulant aid adding device are respectively connected with the reaction tank through pipelines; preferably, the dosing device is a double-layer rectangular box body, wherein the upper layer is a dosing box, a stirrer is arranged in the dosing box, the lower layer is a medicine storage box, and medicines in the medicine storage box are pumped into the reaction tank through a peristaltic pump.
As a preferred embodiment, the sedimentation tank is further provided with an overflow partition plate, the height of the upper edge of the overflow partition plate is the same as that of the upper edge of the sedimentation tank, the bottom of the overflow partition plate is provided with a support column, and preferably, the ratio of the height of the overflow partition plate to the height of the reaction tank is 1:1.5-1: 2; more preferably, the volume ratio of the reaction tank to the sedimentation tank is 1:4-1: 5; further preferably, the sedimentation tank is a vertical sedimentation tank or a slant plate sedimentation tank.
Above-mentioned magnetism thoughtlessly congeals integration effluent disposal system, as an preferred embodiment, the water inlet of inlet tube with the delivery port department of sedimentation tank is equipped with turbidity sensor, be equipped with automatically controlled flowmeter in the inlet tube.
A magnetic coagulation integrated wastewater treatment method is implemented by adopting the magnetic coagulation integrated wastewater treatment system, and the method comprises the following steps:
inputting wastewater into the reaction tank, and adding magnetic powder, a coagulant and a coagulant aid into the reaction tank to perform magnetic coagulation reaction;
and step two, conveying the wastewater treated in the step one to a sedimentation tank for sedimentation treatment to respectively obtain purified water and sludge.
As a preferred embodiment, the magnetic coagulation integrated wastewater treatment method further comprises a magnetic powder recovery treatment step after the second step: after the sludge is crushed, magnetic powder is separated by the magnetic separator and is put into the reaction tank again.
In the magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the step one, stirring is carried out during reaction, and the rotating speed is set to be 80-300 r/min; preferably, the stirring is carried out in two steps: firstly, setting the rotating speed to be 80-120r/min, and stirring for 3-5 min; then the rotating speed is set to be 280-300r/min, and the stirring time is 1-2 min.
In the above magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the step one, the particle size of the magnetic powder is 30 to 50 μm; the adding amount of the magnetic powder is 100-1250mg/L (such as 200mg/L, 350mg/L, 500mg/L, 700mg/L, 850mg/L, 1000mg/L, 1150mg/L and 1200 mg/L); preferably, the magnetic powder dosage is 500-750mg/L (such as 520mg/L, 550mg/L, 580mg/L, 620mg/L, 650mg/L, 680mg/L, 700mg/L, 720mg/L, 740 mg/L).
In a preferred embodiment of the above magnetic coagulation integrated wastewater treatment method, in the first step, the amount of the coagulant is 2 to 100mg/L (e.g., 5mg/L, 10mg/L, 20mg/L, 40mg/L, 60mg/L, 80mg/L, 90mg/L), preferably 20 to 100mg/L (e.g., 25mg/L, 40mg/L, 60mg/L, 80mg/L, 90mg/L, 95mg/L), and more preferably 40 to 60mg/L (e.g., 42mg/L, 45mg/L, 50mg/L, 55mg/L, 58 mg/L).
As an optimal implementation mode, in the first step, the adding mode of the medicament and the magnetic powder is as follows: firstly adding magnetic powder, then adding coagulant and finally adding flocculant.
In the above magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the step one, the hydraulic retention time of the reaction tank is 2-3 min.
In the above magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the second step, the hydraulic retention time of the sedimentation tank is 5-7 min.
The technical scheme provided by the invention has the beneficial effects that:
1) the invention combines the magnetic coagulation stirring tank (namely the reaction tank) and the sedimentation tank together, not only can rapidly and stably treat the wastewater, but also saves a single coagulant PAC and coagulant aid PAM stirring tank, greatly reduces the occupied area, avoids the loss of magnetic powder in different tanks, simultaneously improves the removal efficiency, saves the consumption of corollary equipment and energy sources, and reduces the cost of sewage treatment.
2) The magnetic coagulation integrated wastewater treatment system and method provided by the invention can be widely applied to various medium and small-scale water use conditions, and the effluent water quality is good, the cost is low, the occupied area is small, the energy consumption is low, the water treatment efficiency is high, and the system and method can be widely applied to communities to solve the problem of community water use.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic coagulation integrated wastewater treatment system in a preferred embodiment of the present invention;
wherein, the method comprises the following steps of 1-water inlet pipe, 2-coagulant adding device, 3-coagulant aid adding device, 4-reaction tank, 5-sedimentation tank, 6-sludge pump, 7-high speed shearing machine, 8-magnetic separator, 9-sludge treatment equipment and 10-water outlet; 11-an overflow baffle;
FIG. 2 is a graph showing the effect of magnetic coagulation in the case of different coagulant addition amounts in example 1 of the present invention;
FIG. 3 is a graph showing the effect of magnetic coagulation at different times of magnetic coagulation deposition in example 2 of the present invention;
FIG. 4 is a graph showing the effect of magnetic coagulation at different amounts of added magnetic powder in example 3 of the present invention;
FIG. 5 is a graph showing the effect of magnetic coagulation in different feeding modes in example 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those 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.
The invention relates to an integrated reaction tank in a magnetic coagulation integrated wastewater treatment system, which is characterized in that a reaction tank and a sedimentation tank are combined together to form a coagulation, flocculation and magnetic powder integrated reaction tank. Referring to fig. 1, a preferred embodiment of the magnetic coagulation integrated wastewater treatment system provided by the present invention comprises: a water inlet pipe 1, a reaction tank 4, a dosing device, a magnetic powder adding device and a sedimentation tank 5. The above components are explained one by one below.
The reaction tank 4 is a device for receiving wastewater, medicament and magnetic powder and performing magnetic coagulation treatment on the wastewater, namely, the wastewater enters the reaction tank 4 and then undergoes magnetic coagulation reaction to form magnetic flocs, and after the reaction is finished, the wastewater containing the magnetic flocs enters the sedimentation tank 5 for sedimentation. The reaction tank 4 comprises a hollow tank body with a closed bottom and an open upper end, and the tank body can be cylindrical, cubic or the like. The reaction tank 4 is arranged in the upper part of the sedimentation tank 5, and in a preferred embodiment of the invention, the reaction tank is supported in the upper part of the sedimentation tank 5 by means of a support column (not shown) arranged between the bottom of the reaction tank and the bottom of the sedimentation tank. The upper edge position of the reaction tank 4 is higher than the upper edge position of the sedimentation tank 5, and the height difference is that after the sewage treated in the reaction tank 4 enters the sedimentation tank 5, the water in the reaction tank 4 and the water in the sedimentation tank 5 are not mixed when the sedimentation tank 5 is full, so that the treatment effect is not influenced. The reaction tank 4 is respectively connected with a dosing device, a water inlet pipe 1 and a magnetic powder adding device (not shown in the figure), and is used for receiving the medicament conveyed by the dosing device, the wastewater conveyed by the water inlet pipe 1 and the magnetic powder conveyed by the magnetic powder adding device, and is a place for carrying out coagulation, flocculation and magnetic coagulation integrated treatment on the wastewater; specifically, one end of the water inlet pipe 1 extends into the reaction tank 4, and the other end of the water inlet pipe is connected with a wastewater supply device, so that wastewater is conveyed into the reaction tank 4 through the water inlet pipe 1, the chemical feeding device and the magnetic powder adding device can convey chemicals and magnetic powder into the reaction tank 4 through a pipeline extending into the reaction tank 4 from an upper opening of the reaction tank 4, or a water inlet, a chemical inlet and a magnetic powder inlet can be formed in the tank wall of the reaction tank 4, and the chemical feeding device and the magnetic powder adding device are connected with the inlets through pipelines, so that the chemicals and the magnetic powder are conveyed into the reaction tank 4; the water inlet pipe 1 conveys the wastewater into the reaction tank 4 through the water inlet. In a preferred embodiment of the present invention, a cover plate is disposed above the reaction tank and used for fixing a dosing device (specifically, a drug feeding tube) and a magnetic powder feeding device (specifically, a magnetic powder feeding tube), a water inlet tube 1, and other devices that may need to be fixed, such as a coagulation mixer extending into the reaction tank, wherein the dosing device and the magnetic powder feeding device both extend into the reaction tank 4 from an upper opening of the reaction tank 4 through pipelines; one end of the water inlet pipe 1 extends into the reaction tank 4 to convey the wastewater into the reaction tank 4. The wastewater in the reaction tank 4 enters a sedimentation tank 5 after reaction; specifically, the wastewater can enter the sedimentation tank 5 in an overflow mode, or the upper part of the tank wall of the reaction tank 4 is provided with a reaction tank water outlet through which the wastewater is discharged into the sedimentation tank 5. Preferably, the reaction tank 4 is further provided with a stirring device for stirring the wastewater in the reaction tank 4, promoting the magnetic coagulation reaction and accelerating the overflow of the magnetic polymer in the reaction tank, thereby increasing the reaction efficiency.
The medicine adding device is a device for adding a medicine into the reaction tank 4. The dosing device comprises a coagulant adding device and a coagulant aid adding device, wherein the coagulant adding device 2 comprises a coagulant dosing tank and a coagulant storage tank, the coagulant adding device 3 comprises a coagulant dosing tank and a coagulant storage tank, and the coagulant adding device 2 and the coagulant adding device 3 are respectively connected with the reaction tank 4 through pipelines. Preferably, the dosing device is a double-layer box body, wherein the upper layer is a dosing box, a stirrer is preferably arranged in the dosing device, the lower layer is a medicine storage box in the place for dosing medicines, the dosed medicines in the dosing box enter the medicine storage box through a water faucet arranged between the dosing box and the medicine storage box, the medicines in the medicine storage box are pumped into the reaction tank 4 through a peristaltic pump, and the medicine concentration in the reaction tank is controlled by adjusting different flow rates. In the preferred embodiment of the invention, the coagulant adding device 2 is a double-layer rectangular box body, the upper layer is a coagulant dispensing box and is internally provided with a stirrer, the lower layer is a coagulant storage box which is connected with the reaction tank 4 through a pipeline, the prepared coagulant in the coagulant dispensing box enters the coagulant storage box through a water faucet arranged between the two, and the coagulant in the coagulant storage box is pumped into the reaction tank 4 by regulating different flow rates through a peristaltic pump; the coagulant aid adding device 3 is a double-layer rectangular box body, the upper layer is a coagulant aid dispensing box, a stirrer is arranged in the coagulant aid adding device, the lower layer is a coagulant aid storage box and is connected with the reaction tank 4 through a pipeline, the prepared coagulant aid in the coagulant aid dispensing box enters the coagulant aid storage box through a water tap, and the coagulant aid in the coagulant aid storage box is pumped into the reaction tank 4 by adjusting different flow rates through a peristaltic pump.
The sedimentation tank 5 is a device for removing suspended matters in the wastewater output from the reaction tank 4 by sedimentation and outputting purified water. The sedimentation tank 5 comprises a sedimentation tank body and a sludge hopper, the sedimentation tank body is a main place for sedimentation, the plane of the sedimentation tank body can be in any shape which is round, rectangular, square or other and is convenient to implement, the sludge hopper is arranged at the lower part of the sedimentation tank body and is communicated with a sewage sludge pipeline, and the sludge hopper is used for receiving and gathering sediments (namely, sediment formed after magnetic floc suspended matters are gathered is gathered in the sludge hopper, also called sludge) and discharging the sediments to the sedimentation tank 5 through the sewage sludge pipeline, and the sludge hopper can be in any shape which is conical, truncated conical or other shapes and can be realized. Specifically, in the process of falling after wastewater flows into the sedimentation tank body from the reaction tank 4, due to the action of gravity, magnetic floc suspended matters in the wastewater are gathered and finally precipitated, the wastewater enters a sludge hopper and is discharged through a sludge discharge pipeline, and the obtained purified water can flow out from the upper part of the sedimentation tank, for example, from a water outlet arranged at the upper part of the sedimentation tank body, or can flow out in an overflow mode from the upper edge of the sedimentation tank without a water outlet; in the preferred embodiment of the invention, the sedimentation tank 5 comprises a sedimentation tank body and a sludge hopper, the bottom of the sludge hopper is provided with an outlet which is connected with a sewage sludge pipeline, the reacted wastewater flows out of the reaction tank 4 and then enters the sedimentation tank body, suspended matters gathered together are precipitated under the action of gravity in the downward flowing process, and the suspended matters are gathered and precipitated to form sludge which enters the sludge hopper and is discharged through the sewage sludge pipeline; the purified wastewater is discharged from the sedimentation tank body in an overflowing manner. Preferably, an overflow baffle 11 is further arranged in the sedimentation tank 5, the overflow baffle 11 is arranged between the tank wall of the sedimentation tank 5 and the tank wall of the reaction tank 4, a gap is left between the bottom end of the overflow baffle 11 and the bottom end of the sedimentation tank, the height of the upper edge of the overflow baffle is slightly higher than or equal to the height of the upper edge of the sedimentation tank 5 (namely, the upper edge of the overflow baffle is the same as the horizontal plane of the upper edge of the sedimentation tank 5 or the horizontal plane of the upper edge of the overflow baffle is higher than the horizontal plane of the upper edge of the sedimentation tank 5), and a support column (not shown in the figure) is arranged between the bottom end of the overflow baffle and the bottom end of the sedimentation tank; the overflow partition plate is arranged, on one hand, the uniformity of water flow can be kept, on the other hand, after wastewater in the reaction tank 4 enters the sedimentation tank 5 for sedimentation, upper water overflows to one side far away from the reaction tank 4 through the upper edge of the partition plate, so that the phenomenon that the outlet water at the outer side (the side far away from the reaction tank) of the partition plate 11 is mixed with the inlet water from the reaction tank at the inner side (the side near to the reaction tank) of the partition plate 11 to influence the quality of outlet water is prevented, and the quality of the outlet water of the sedimentation tank 5 is further ensured due to the arrangement of the overflow; the ratio of the height of the overflow partition plate to the height of the sedimentation tank is preferably 1:1.5-1:2, the lower water flow can pass through the overflow partition plate conveniently, and the flow separation effect of the upper part is better. Preferably, the sedimentation tank 5 may be a vertical sedimentation tank or a slant plate type sedimentation tank.
As a preferred embodiment, the magnetic coagulation integrated wastewater treatment system further includes: a sludge pump 6; the sludge pump 6 is arranged on the sludge discharge pipeline and is used for conveying the sludge discharged from the sedimentation tank 5.
As a preferred embodiment, the magnetic coagulation integrated wastewater treatment system further includes: and the magnetic separator 8 is connected with the sludge discharge pipeline and is used for receiving the sludge discharged from the sedimentation tank 5 and separating and recovering magnetic powder from the sludge. In the preferred embodiment of the invention, the magnetic separator 8 is at least provided with a sludge inlet, a magnetic powder outlet and a sludge outlet, wherein the sludge inlet is connected with a sludge discharge pipeline, the magnetic powder outlet is communicated with the reaction tank 4, and the sludge outlet is communicated with the sludge treatment equipment 9; and the sludge discharged from the sedimentation tank 5 enters a magnetic separator 8, the sludge is discharged to sludge treatment equipment 9 after magnetic powder is separated, and the magnetic powder obtained by separation is conveyed to the reaction tank 4 to be recycled.
As a preferred embodiment, the magnetic coagulation integrated wastewater treatment system further includes: the high-speed shearing machine 7 is arranged on the sludge discharge pipeline and between the sludge pump 6 and the magnetic separator 8, and is used for crushing the sludge discharged from the sedimentation tank 5, namely dispersing magnetic flocs in the crushed sludge, so that magnetic powder can be recovered conveniently. The magnetic flocs are subjected to comprehensive actions of hydraulic shearing, centrifugal extrusion, impact, grinding and the like in a high shearing machine, so that the effect of dispersing and crushing is achieved. The high-speed shearing machine is used for breaking magnetic flocs and separating magnetic powder from the flocs, and is an essential device for recovering the magnetic powder.
Preferably, the volume ratio of the reaction tank 4 to the sedimentation tank 5 is 1:4-1: 5. Exceeding this ratio will result in a hydraulic retention time that is too long, and will not significantly improve the sewage treatment effect, but will increase the floor area.
Preferably, the water inlet of inlet tube 1 and the delivery port department of sedimentation tank 5 are equipped with turbidity sensor for monitor business turn over water quality of water, the problem that the early warning probably appears simultaneously, through comparing business turn over water turbidity promptly, in case go out too high to stop the operation of water turbidity and inspect the reason.
Preferably, an electrically controlled flowmeter is arranged in the water inlet pipe 1 for monitoring the flow of inlet water and adjusting in real time to achieve the optimal treatment effect.
A magnetic coagulation integrated wastewater treatment method is implemented by adopting the magnetic coagulation integrated wastewater treatment system, and comprises the following steps:
the method comprises the following steps: inputting the wastewater into a reaction tank 4, and adding magnetic powder, a coagulant and a coagulant aid into the reaction tank 4 to perform magnetic coagulation reaction;
and step two, conveying the wastewater treated in the step one to a sedimentation tank 5 for sedimentation treatment to respectively obtain purified water and sludge (including magnetic flocs).
As a preferred embodiment, the step two further comprises a magnetic powder recovery treatment step, wherein after the sludge is crushed, magnetic powder is separated by a magnetic separator 8 and is put into the reaction tank 4 again.
In the above magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the first step, the magnetic coagulation reaction is performed under stirring at a rotation speed of 80-300r/min (e.g., 82r/min, 85r/min, 90r/min, 100r/min, 120r/min, 150r/min, 200r/min, 220r/min, 250r/min, 280r/min, 295 r/min); more preferably, the stirring is carried out in two steps: firstly, setting the rotating speed to be 80-120r/min (such as 82r/min, 85r/min, 90r/min, 95r/min, 100r/min, 105r/min, 110r/min, 115r/min and 118r/min), stirring for 2-3min (such as 2.2min, 2.5min and 2.8min), and fully mixing and reacting the medicament and the wastewater; then the rotating speed is set to be 280-300r/min (such as 282r/min, 285r/min, 290r/min, 295r/min and 298r/min), the stirring time is 1-2min (such as 1.2min, 1.5min and 1.8min), and the purpose is to accelerate the overflow of the magnetic polymer in the reaction tank and increase the reaction efficiency.
In the above-mentioned magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the step one, the magnetic powder added into the reaction tank 4 has a particle size of 30-50 μm (for example, 32 μm, 35 μm, 40 μm, 45 μm, 48 μm). In the magnetic coagulation treatment process, after magnetic powder is added, numerous tiny vortexes can be formed behind the movement path of the magnetic powder, and the size of the vortexes is in direct proportion to the particle size of the magnetic powder and in inverse proportion to the generated vortex centrifugal inertia force. In the coagulation process, the solid particles in water continuously change directions under the action of centrifugal inertia force generated by turbulent vortex, so that the probability of mutual collision is increased, the growth of flocs is not facilitated due to too small inertia force, and the structure of the flocs is damaged due to too large inertia force. The particle size of the magnetic powder is limited to 30-50 mu m, so that magnetic flocs are more easily formed with the flocs, and the formation of the magnetic flocs can be influenced by the too large or too small particle size of the magnetic powder.
In the above-mentioned magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the first step, the coagulant is added in an amount of 2 to 100mg/L (e.g., 5mg/L, 10mg/L, 15mg/L, 20mg/L, 25mg/L, 40mg/L, 60mg/L, 80mg/L, 90mg/L, 95mg/L), more preferably 20 to 100mg/L, still more preferably 40 to 60mg/L (e.g., 42mg/L, 45mg/L, 50mg/L, 55mg/L, 58 mg/L).
As a preferred embodiment, in the step one, the adding amount of magnetic powder is 1250mg/L (such as 110mg/L, 150mg/L, 230mg/L, 280mg/L, 350mg/L, 400mg/L, 450mg/L, 500mg/L, 520mg/L, 550mg/L, 580mg/L, 620mg/L, 650mg/L, 680mg/L, 700mg/L, 720mg/L, 740mg/L, 800mg/L, 850mg/L, 900mg/L, 1000mg/L, 1100mg/L, 1200mg/L), and more preferably, the adding amount of magnetic powder is 500-750mg/L (such as 520mg/L, 550mg/L, 580 mg/L), 620mg/L, 650mg/L, 680mg/L, 700mg/L, 720mg/L, 740 mg/L).
As an optimal implementation mode, in the first step, the adding mode of the medicament and the magnetic powder is as follows: firstly adding magnetic powder, then adding coagulant and finally adding flocculant.
As a preferred embodiment, in the step one, the hydraulic retention time of the reaction tank 4 is 2-3min (e.g., 2.2min, 2.5min, 2.8min), which can be adjusted according to actual conditions.
In the above magnetic coagulation integrated wastewater treatment method, as a preferred embodiment, in the step two, the hydraulic retention time in the sedimentation tank 5 is 5-7min (e.g., 5.2min, 5.5min, 6min, 6.5min, 6.8min), which can be adjusted according to actual conditions.
Examples
The structure of the magnetic coagulation integrated wastewater treatment system provided by the preferred embodiment is shown in fig. 1, and the system comprises a water inlet pipe 1, a reaction tank 4, a dosing device, a magnetic powder adding device and a sedimentation tank 5; wherein,
the water inlet pipe, the dosing device and the magnetic powder adding device are respectively communicated with the reaction tank and used for adding wastewater, medicament and magnetic powder into the reaction tank;
the reaction tank 4 is used for carrying out magnetic coagulation treatment on the wastewater, and comprises a hollow cylindrical tank body with a closed bottom and an open upper end, is arranged at the upper part in the sedimentation tank 5, and is supported by a support column arranged between the bottom of the reaction tank and the bottom of the sedimentation tank; a cover plate is arranged above the reaction tank and used for fixing the dosing device, the magnetic powder adding device, the water inlet pipe 1 and the coagulation stirrer extending into the reaction tank;
the sedimentation tank 5 is used for settling and removing suspended matters in the wastewater output by the reaction tank 4 and outputting purified water, and comprises a circular plane sedimentation tank body and a truncated cone-shaped sludge bucket arranged below the circular plane sedimentation tank body, wherein an outlet is arranged at the bottom of the sludge bucket and is connected with a sewage sludge pipeline. An overflow partition plate is also arranged in the sedimentation tank 5, the height of the upper edge of the overflow partition plate is the same as that of the upper edge of the sedimentation tank 5, and a support column (not shown in the figure) is arranged in the middle of the bottom of the overflow partition plate; the ratio of the height of the overflow partition plate to the height of the sedimentation tank is 1: 1.5; the volume ratio of the reaction tank to the sedimentation tank is 1: 4.
The dosing device comprises a coagulant adding device 2 and a coagulant aid adding device 3, and is a double-layer rectangular box body, wherein the upper layer is a dosing box, a stirrer is arranged in the dosing box, the lower layer is a medicine storage box, and medicines in the medicine storage box are pumped into the reaction tank through a peristaltic pump.
The system further comprises: the sludge pump 6, the high-speed shearing machine 7 and the magnetic separator 8 are sequentially arranged on the sludge discharge pipeline, the sludge pump 6 is used for conveying sludge discharged from the sedimentation tank 5, the high-speed shearing machine 7 is used for crushing the sludge, and the magnetic separator 8 is used for separating and recovering magnetic powder from the crushed sludge; the magnetic separator 8 is communicated with the reaction tank 4, and magnetic powder obtained by separation can be recycled.
In addition, turbidity sensors are arranged at the water inlet of the water inlet pipe 1 and the water outlet 10 of the sedimentation tank 5, and an electric control flowmeter is arranged in the water inlet pipe 1.
When the system is used for treating wastewater, wastewater is added into the reaction tank 4 through the water inlet pipe 1, a coagulant and a flocculant are added through the dosing device, magnetic powder is added through the magnetic powder adding device, and magnetic coagulation reaction is carried out in the reaction tank under the stirring of the coagulation stirrer; the reacted wastewater flows out of the reaction tank 4 and then enters the sedimentation tank body, the aggregated suspended matters are precipitated under the action of gravity in the downward flowing process, the suspended matters are aggregated and precipitated to form sludge, the sludge enters a sludge hopper and is discharged through a sludge discharge pipeline under the action of a sludge pump, and the purified wastewater is discharged through the overflow of a water outlet 10 of the sedimentation tank 5; after the sludge is broken and dispersed by a high-speed shearing machine 7, magnetic powder and sludge are separated by a magnetic separator 8, the magnetic powder is thrown into a reaction tank for recycling, and the sludge is conveyed to sludge treatment equipment for treatment. Examples of the above system for treating wastewater are as follows.
In the following examples, the basic parameters of the waste water treated are shown in Table 1:
TABLE 1 parameters of wastewater to be treated
| COD mg/L | Ammonia nitrogen mg/L | TP mg/L | turbidity/NTU |
| 40.5 | 7.7 | 4.3 | 7.5 |
The coagulant used in the test was industrial grade polyaluminium chloride, the flocculant (i.e., coagulant aid) was industrial grade polyacrylamide, and the magnetic powder was Fe3O4。
Example 1
The magnetic coagulation method of the embodiment treats the wastewater, six groups of tests are designed, the magnetic coagulation sedimentation time is 6min, the coagulant adding amount is different, and the flocculating agent and the magnetic powder adding amount are fixed, which are respectively as follows: the adding amount of the flocculating agent is 0.3mg/L, the adding amount of the magnetic powder is 500mg/L, and the stirring system of the reaction tank is as follows: firstly stirring for 2min at the rotating speed of 80r/min, and then stirring for 1min at the rotating speed of 300 r/min; the test results are shown in table 2 and fig. 2.
TABLE 2 magnetic coagulation effect at different coagulant dosing amounts
Example 2
The magnetic coagulation method of the embodiment treats the wastewater, six groups of tests are designed, the magnetic coagulation sedimentation time is different, and the adding amount of the medicament and the adding amount of the magnetic powder are fixed: the coagulant adding amount is 50mg/L, the flocculating agent adding amount is 0.3mg/L, the magnetic powder adding amount is 500mg/L, and the stirring system of the reaction tank is as follows: firstly stirring for 2min at the rotating speed of 80r/min, and then stirring for 1min at the rotating speed of 300 r/min; the test results are shown in table 3 and fig. 3.
TABLE 3 magnetic coagulation Effect at different magnetic coagulation sedimentation times
Example 3
The magnetic coagulation method of the embodiment treats the wastewater, six groups of tests are designed, the adding amount of the magnetic powder is different, and the adding amount of the medicament and the adding amount of the magnetic powder are fixed: the coagulant adding amount is 50mg/L, the flocculating agent adding amount is 0.3mg/L, the magnetic coagulation sedimentation time is 6min, and the reaction tank stirring system is as follows: firstly stirring for 2min at the rotating speed of 80r/min, and then stirring for 1min at the rotating speed of 300 r/min; the test results are shown in table 4 and fig. 4.
TABLE 4 magnetic coagulation effect at different magnetic powder addition
Example 4
The magnetic coagulation method of this embodiment treats the above-mentioned waste water, and three sets of experiments are designed altogether, and the magnetic coagulation sedimentation time is 6min, and the medicament dosage and the magnetic powder dosage are fixed: the adding amount of a coagulant (PAC) is 50mg/L, the adding amount of a flocculant (PAM) is 0.3mg/L, and the adding amount of magnetic powder is 500mg/L, but the adding modes of a medicament and the magnetic powder are different, namely the adding sequence is different, wherein the adding of the PAC, the magnetic powder and the PAM indicates that the coagulant is added firstly, then the magnetic powder is added, and finally the PAM is added; the expression of magnetic powder + PAC + PAM means that magnetic powder is added firstly, then coagulant is added, and finally flocculant is added; "(magnetic powder PAC) + PAM" means that firstly, the magnetic powder and PAC are added simultaneously, and then PAM is added; the stirring system of the reaction tank is as follows: firstly stirring for 2min at the rotating speed of 80r/min, and then stirring for 1min at the rotating speed of 300 r/min; the test results are shown in table 5 and fig. 5. As can be seen from FIG. 5, the removal rates of COD, ammonia nitrogen, turbidity and total phosphorus are higher in the three adding modes. However, the different adding sequence of the PAC, the magnetic powder and the PAM has different removing effects by comparing the values of the COD, the ammonia nitrogen, the turbidity and the total phosphorus removing rate, wherein the adding mode 2 is that the magnetic powder is added firstly, then the coagulant PAC is added, and finally the adding sequence of the coagulant aid PAM has better comprehensive effect.
TABLE 5 magnetic coagulation effect under different feeding modes
Example 5
The magnetic coagulation method of the embodiment treats the wastewater, two sets of tests are designed, the stirring conditions are different, and other conditions are the same: the magnetic coagulation sedimentation time is 6min, the adding amount of the medicament and the adding amount of the magnetic powder are fixed: the adding amount of a coagulant (PAC) is 50mg/L, the adding amount of a flocculant (PAM) is 0.3mg/L, and the adding amount of magnetic powder is 500mg/L, wherein the adding sequence comprises adding magnetic powder, adding the coagulant and adding the flocculant at last. The test results are shown in Table 6.
TABLE 6 magnetic coagulation effect under different stirring modes
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A magnetic coagulation integrated wastewater treatment system is characterized by comprising a water inlet pipe, a dosing device, a magnetic powder adding device, a reaction tank and a sedimentation tank; wherein,
the water inlet pipe, the dosing device and the magnetic powder adding device are respectively communicated with the reaction tank and used for adding wastewater, a medicament and magnetic powder into the reaction tank;
the reaction tank is arranged at the upper part in the sedimentation tank and is used for receiving the wastewater, the medicament and the magnetic powder and carrying out magnetic coagulation treatment on the wastewater;
the sedimentation tank comprises a sedimentation tank body and a sludge hopper arranged at the lower part of the sedimentation tank body, wherein the sedimentation tank body is communicated with the reaction tank and is used for receiving the wastewater output by the reaction tank, settling suspended matter floccules in the wastewater and outputting purified water; the sludge bucket is used for receiving and gathering suspended matter flocculating constituents precipitated in the sedimentation tank body, and the precipitated suspended matter flocculating constituents are discharged through a sludge discharge pipeline communicated with the sludge bucket.
2. The integrated magnetic coagulation wastewater treatment system as set forth in claim 1, further comprising: and the sludge pump is arranged on the sludge discharge pipeline and is used for conveying the sludge discharged from the sedimentation tank.
3. The integrated magnetic coagulation wastewater treatment system as set forth in claim 2, further comprising:
the high-speed shearing machine is arranged on the sludge discharge pipeline, is positioned behind the sludge pump and is used for crushing sludge discharged from the sedimentation tank;
the magnetic separator is connected with the sludge discharge pipeline, is arranged behind the high-speed shearing machine and is used for separating and recovering magnetic powder from the crushed sludge;
preferably, an outlet of the magnetic separator is communicated with the reaction tank or the magnetic powder adding device, so that the separated magnetic powder is conveyed to the reaction tank or the magnetic powder adding device.
4. A magnetic coagulation integrated wastewater treatment system according to any one of claims 1 to 3,
a stirring device is arranged in the reaction tank;
the coagulant adding device comprises a coagulant adding device and a coagulant aid adding device, wherein the coagulant adding device comprises a coagulant dosing tank and a coagulant aid storage tank, the coagulant aid adding device comprises a coagulant aid dosing tank and a coagulant aid storage tank, and the coagulant adding device and the coagulant aid adding device are respectively connected with the reaction tank through pipelines;
preferably, the dosing device is a double-layer rectangular box body, wherein the upper layer is a dosing box, a stirrer is arranged in the dosing box, the lower layer is a medicine storage box, and medicines in the medicine storage box are pumped into the reaction tank through a peristaltic pump.
5. A magnetic coagulation integrated wastewater treatment system according to any one of claims 1 to 3, wherein an overflow baffle is further arranged in the sedimentation tank, the overflow baffle is arranged between the tank wall of the sedimentation tank and the tank wall of the reaction tank, a gap is left between the bottom end of the overflow baffle and the bottom end of the sedimentation tank, the height of the upper edge of the overflow baffle is slightly higher than or equal to the height of the upper edge of the sedimentation tank, a support column is arranged at the bottom of the overflow baffle, and preferably, the ratio of the height of the overflow baffle to the height of the sedimentation tank is 1:1.5-1: 2; more preferably, the volume ratio of the reaction tank to the sedimentation tank is 1:4-1: 5; further preferably, the sedimentation tank is a vertical sedimentation tank or a slant plate sedimentation tank.
6. The magnetic coagulation integrated wastewater treatment system as claimed in any one of claims 1 to 3, wherein turbidity sensors are provided at the water inlet of the water inlet pipe and the water outlet of the sedimentation tank, and an electrically controlled flow meter is provided on the water inlet pipe.
7. A magnetic coagulation integrated wastewater treatment method, which is implemented by using the magnetic coagulation integrated wastewater treatment system according to any one of claims 1 to 6, and comprises the following steps:
inputting wastewater into the reaction tank, and adding magnetic powder, a coagulant and a coagulant aid into the reaction tank to perform magnetic coagulation reaction;
and step two, conveying the wastewater treated in the step one to a sedimentation tank for sedimentation treatment to respectively obtain purified water and sludge.
Preferably, the second step is followed by a magnetic powder recovery processing step: and after the sludge is crushed, separating magnetic powder by the magnetic separator, and putting the magnetic powder into the reaction tank again.
8. The magnetic coagulation integrated wastewater treatment method according to claim 7, wherein in the first step, stirring is performed during reaction, and the rotating speed is set to 80-300 r/min; preferably, the stirring is carried out in two steps: firstly, setting the rotating speed to be 80-120r/min, and stirring for 2-3 min; then the rotating speed is set to be 280-300r/min, and the stirring time is 1-2 min.
9. The magnetic coagulation integrated wastewater treatment method as claimed in claim 7 or 8, wherein in the first step, the particle size of the magnetic powder is 30-50 μm, and the adding amount of the magnetic powder is 100-1250 mg/L; preferably, the adding amount of the magnetic powder is 500-750 mg/L; the adding amount of the coagulant is 2-100mg/L, preferably 20-100mg/L, more preferably 40-60 mg/L;
further preferably, the adding mode of the medicament and the magnetic powder is as follows: firstly adding magnetic powder, then adding coagulant and finally adding flocculant.
10. The magnetic coagulation integrated wastewater treatment method according to claim 7 or 8, wherein in the first step, the hydraulic retention time of the reaction tank is 2-3 min; in the second step, the hydraulic retention time of the sedimentation tank is 5-7 min.
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| CN112591952A (en) * | 2020-11-06 | 2021-04-02 | 中能化江苏地质矿产设计研究院有限公司 | System for coal fired power plant desulfurization waste water is handled to magnetism coagulation |
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