CN112358116A - Efficient sludge backflow system and method for reinforcing magnetic coagulation separation process - Google Patents
Efficient sludge backflow system and method for reinforcing magnetic coagulation separation process Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 184
- 238000005345 coagulation Methods 0.000 title claims abstract description 109
- 230000015271 coagulation Effects 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000000926 separation method Methods 0.000 title claims abstract description 32
- 230000003014 reinforcing effect Effects 0.000 title description 2
- 238000006243 chemical reaction Methods 0.000 claims abstract description 72
- 238000004062 sedimentation Methods 0.000 claims abstract description 70
- 238000007885 magnetic separation Methods 0.000 claims abstract description 51
- 239000000701 coagulant Substances 0.000 claims abstract description 35
- 238000011084 recovery Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000010992 reflux Methods 0.000 claims abstract description 24
- 238000005728 strengthening Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000005189 flocculation Methods 0.000 claims abstract description 10
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 239000010865 sewage Substances 0.000 claims description 37
- 239000006247 magnetic powder Substances 0.000 claims description 24
- 229940037003 alum Drugs 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000001965 increasing effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 5
- 230000002776 aggregation Effects 0.000 abstract 1
- 238000004220 aggregation Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010977 unit operation Methods 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
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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
- C02F2001/007—Processes including a sedimentation step
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- Water Supply & Treatment (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a high-efficiency sludge backflow system and a method thereof for strengthening a magnetic coagulation separation process, wherein the backflow system consists of a magnetic coagulation reaction system, a rapid sedimentation tank, a magnetic separation system and a magnetic recovery system, the magnetic coagulation reaction system, the rapid sedimentation tank, the magnetic separation system and the magnetic recovery system are sequentially communicated, the high-efficiency sludge backflow method for strengthening the magnetic coagulation separation process enables part of settled sludge in the rapid sedimentation tank to flow back to the magnetic coagulation reaction system and all sludge in the magnetic separation system to flow back to the magnetic coagulation reaction system, the backflow sludge and flocculation liquid are further mixed and react, the backflow sludge can increase the concentration of particulate matters in water, the aggregation and sedimentation of the particles are facilitated, and the other part of sludge enters the magnetic recovery system. The invention has the advantages of easy sludge reflux control, stable work, high system impact load resistance, small dosage of medicament, high sludge load and durability, and improves the utilization rate of coagulant and coagulant aid by selecting sludge reflux modes according to working conditions.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a high-efficiency sludge backflow system and a high-efficiency sludge backflow method for strengthening a magnetic coagulation separation process.
Background
The sewage treatment is a process for purifying sewage to meet the requirement of discharging the sewage into a certain water body or reusing the sewage, coagulation refers to a process for gathering colloidal particles and tiny suspended matters in the water by a certain method (such as adding chemical agents), is a unit operation in the water and wastewater treatment process, the coagulation comprises two processes of coagulation and flocculation, agents with coagulation and flocculation functions are collectively called coagulant, the coagulation mainly refers to a process for destabilizing the colloid and generating tiny aggregates, the flocculation mainly refers to a process for coalescing the destabilized colloid or tiny suspended matters into large floccules, magnetic coagulation sedimentation is a commonly used coagulation method in the sewage treatment, iron, aluminum, polyacrylamide and the like are generally added in the process, in the existing sludge backflow method, when the quality of inlet water is unstable, and the operation working conditions of equipment have great difference, the sludge backflow amount cannot be flexibly controlled, the impact sludge load of equipment is overlarge, in addition, the utilization efficiency of a coagulant and a coagulant aid is lower in the sewage treatment process, so that the dosage of a medicament is large, the sludge utilization rate is low, the sludge load in a final system is reduced, the treatment efficiency of a coagulation separation system is reduced, the stable and efficient operation of the system is not facilitated, and aiming at the condition, the efficient sludge backflow system and the method for strengthening the magnetic coagulation separation process are provided.
Disclosure of Invention
The invention aims to provide a high-efficiency sludge backflow system and a method thereof for strengthening the magnetic coagulation separation process, which have the advantages of easy sludge backflow control, stable work, high shock load resistance of the system, small dosage of a medicament, high sludge load, durability and the like.
The purpose of the invention can be realized by the following technical scheme:
a high-efficiency sludge backflow system for strengthening a magnetic coagulation separation process comprises a magnetic coagulation reaction system, a quick sedimentation tank, a magnetic separation system and a magnetic recovery system which are sequentially communicated with one another;
the magnetic coagulation reaction system is divided into a fast reaction tank and a slow coagulation tank, and is connected with a dosing system;
the dosing system respectively adds coagulant and magnetic powder into the rapid reaction tank, and adds coagulant aid into the slow coagulation tank;
the rapid sedimentation tank is a pre-sedimentation reaction tank, alum floc generated after the reaction of a coagulant, a coagulant aid and return sludge is subjected to pre-sedimentation treatment in the tank, a sludge hopper is arranged at the bottom of the tank to store the sedimentation sludge, and the bottom of the rapid sedimentation tank is in an inverted trapezoid shape;
the working condition I is as follows: the high-efficiency sludge return system is characterized in that when the concentration of suspended matters in influent sewage of the magnetic coagulation reaction system is less than 100 mg/L: part of sludge in the quick sedimentation tank flows back to the magnetic coagulation reaction system, and all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, wherein the sludge reflux ratio is the ratio of the amount of the reflux sludge to the amount of the water inlet sludge, and is (5-10): 1, and the amount of the reflux sludge is the sum of the amount of the reflux sludge in the quick sedimentation tank and the amount of the reflux sludge in the magnetic separation system;
working conditions are as follows: when the concentration of the water inlet sewage suspended matters of the magnetic coagulation reaction system is 100-300 mg/L, all sludge in the rapid sedimentation tank is transmitted to the magnetic recovery system, all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, the sludge reflux ratio is the ratio of the reflux sludge amount of the magnetic separation system to the water inlet sludge amount, and is (1-5): 1, the amount of the return sludge is the amount of the return sludge of the magnetic separation system;
working conditions are as follows: when the concentration of the influent sewage suspended matters of the magnetic coagulation reaction system is more than 300mg/L, all sludge in the quick sedimentation tank is transmitted to the magnetic recovery system, and all sludge in the magnetic separation system enters the magnetic recovery system.
Preferably, the high-efficiency sludge backflow method for enhancing the magnetic coagulation separation process comprises the following steps:
the method comprises the following steps: the sewage enters a magnetic coagulation reaction system, coagulant and magnetic powder are added through a dosing system and then are rapidly stirred, and the powdery magnetic powder is combined with floc in the coagulation process to form high-density floc with the magnetic powder as a core;
step two: adding coagulant aid, stirring at a low speed, then allowing the sewage to enter a quick sedimentation tank for continuous coagulation sedimentation, and storing partial sedimentation sludge in a sludge hopper at the bottom of the tank;
step three: in the quick settling tank, flocculate enters a magnetic separation system along with effluent through a water outlet tank for solid-liquid separation, supernatant flows out through a water outlet, and all sludge separated by the magnetic separation system flows back to the magnetic coagulation reaction system;
step four: a part of sludge in the rapid sedimentation tank flows back to the magnetic coagulation reaction system, the returned sludge is further mixed and reacted with the flocculation liquid, and the sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, at the moment, colloidal flocs such as iron, aluminum and the like which do not completely participate in the reaction in the sludge can continuously participate in coagulation, so that the dosage of chemicals such as coagulant, flocculant and the like is reduced, the coagulation effect is improved, the concentration of particles in water can be increased by the returned sludge, and the particles can be conveniently aggregated and settled;
step five: and the other part of sludge in the quick settling tank enters a magnetic recovery system to realize the discharge of the residual sludge.
Furthermore, in the rapid sedimentation tank, one part of the sludge which is settled and intercepted to the bottom of the tank continuously flows back to the magnetic coagulation reaction system, and the other part directly enters the magnetic recovery system.
Furthermore, when the concentration of the suspended matters in the influent sewage of the magnetic coagulation reaction system is more than 300mg/L, the sludge backflow does not occur.
The invention has the beneficial effects that:
1. the high-efficiency sludge backflow method for strengthening the magnetic coagulation separation process has the advantages of simple structure of required equipment, easy control of sludge backflow, stable work, high impact-resistant sludge concentration load, small dosage of medicament, high sludge load, durability and the like;
2. the high-efficiency sludge reflux method for strengthening the magnetic coagulation separation process improves the utilization rate of a coagulant and a coagulant aid and increases the concentration of particles in a coagulation tank by selecting the sludge reflux mode according to different working conditions, thereby improving the utilization rate of sludge, realizing high-load operation of a magnetic separation system and ensuring that the effluent stably reaches the standard.
3. The high-efficiency sludge backflow method for strengthening the magnetic coagulation separation process enables sludge in the rapid sedimentation tank to flow back to the coagulation reaction system according to a certain backflow ratio, improves the treatment effect of the coagulation reaction system, can improve the utilization efficiency of coagulants and flocculants enriched in the sludge through sludge backflow, reduces the dosage of medicaments, ensures that the backflow magnetic sludge is a stable floc taking magnetic powder as a coagulation core, and increases the capacity of adsorbing suspended matters on the surface, thereby further improving the treatment capacity of the system;
4. the high-efficiency sludge reflux method for strengthening the magnetic coagulation separation process directly enters the other part of sludge in the quick settling tank into the magnetic recovery system, thereby improving the hydraulic load of the magnetic separation system, and improving the treatment capacity of the magnetic separation system and the operation stability of equipment by increasing the discharge amount of the settled sludge in the quick settling tank when the concentration of the inlet suspended matters fluctuates greatly.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic flow diagram of a high-efficiency sludge recirculation method for enhancing a magnetic coagulation separation process according to the present invention;
FIG. 2 is a bar graph of data on Suspended Solids (SS) in wastewater treatment according to example 1 of the present invention;
FIG. 3 is a schematic flow chart of the efficient sludge recirculation method in example 2 of the present invention;
FIG. 4 is a histogram of data of Suspended Solids (SS) in wastewater treatment according to example 2 of the present invention;
FIG. 5 is a schematic flow chart of the water inflow situation of high-concentration suspended matters in the high-efficiency sludge reflux method for the enhanced magnetic coagulation separation process;
FIG. 6 is a histogram of TP concentration data in sewage treatment according to example 2 of the present invention;
FIG. 7 is a bar graph of data for the suspension (SS) of wastewater treatment according to example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A high-efficiency sludge reflux system for strengthening the magnetic coagulation separation process is disclosed, as shown in figure 1, a treatment device comprises a magnetic coagulation reaction system, a rapid sedimentation tank, a magnetic separation system and a magnetic recovery system which are sequentially communicated with each other, the magnetic coagulation reaction system comprises two boxes and is divided into a rapid reaction tank and a slow coagulation tank, the magnetic coagulation reaction system is connected with a dosing system which respectively adds coagulant and magnetic powder into the rapid reaction tank, coagulant aid is added into the slow coagulation tank, the rapid sedimentation tank is a pre-sedimentation reaction tank, alum floc generated after the reaction of the coagulant, the coagulant aid and the reflux sludge is pre-precipitated in the tank, a sludge hopper is arranged at the bottom of the tank to store the precipitated sludge, the bottom of the rapid sedimentation tank is in an inverted trapezoid shape, when the concentration of influent suspended solids sewage is less than 100mg/L, part of the sludge in the rapid sedimentation tank is refluxed to the magnetic coagulation reaction system, and all the sludge in the magnetic separation system is refluxed to the magnetic coagulation reaction system, the sludge reflux ratio is the ratio of the amount of the reflux sludge to the amount of the influent sludge, and is (5-10): 1, and the amount of the reflux sludge is the sum of the amount of the reflux sludge in the quick sedimentation tank and the amount of the reflux sludge in the magnetic separation system;
when the influent sewage suspended matter concentration is 100-300 mg/L, all sludge in the rapid sedimentation tank is transmitted to the magnetic recovery system, all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, the sludge reflux ratio is the ratio of the reflux sludge amount of the magnetic separation system to the influent sludge amount, and is (1-5): 1, the amount of the return sludge is the amount of the return sludge of the magnetic separation system;
when the concentration of the suspended matters in the influent sewage is more than 300mg/L, all the sludge in the quick sedimentation tank is transmitted to the magnetic recovery system, and all the sludge in the magnetic separation system enters the magnetic recovery system.
A high-efficiency sludge backflow method for strengthening a magnetic coagulation separation process is shown in figures 1, 3 and 6, and comprises the following steps:
the method comprises the following steps: the sewage enters a magnetic coagulation reaction system, coagulant and magnetic powder are added through a dosing system and then are rapidly stirred, and the powdery magnetic powder is combined with floc in the coagulation process to form high-density floc with the magnetic powder as a core;
step two: after the coagulant aid is added, stirring at a low speed, so that fine and loose flocs become thick and compact, the sedimentation of the flocs is accelerated, then the sewage enters a quick sedimentation tank for continuous coagulation sedimentation, the specific gravity of the flocs combined with the magnetic powder is rapidly increased due to the large specific gravity of the magnetic powder, the flocs automatically flow into the quick sedimentation tank and can be rapidly sedimentated, then free sedimentation, flocculation sedimentation and crowded sedimentation are realized in the tank, and partial sedimentated sludge is stored in a sludge hopper at the bottom of the tank;
step three: in the quick settling tank, flocculate enters a magnetic separation system along with effluent through a water outlet tank for solid-liquid separation, supernatant flows out through a water outlet, and all sludge separated by the magnetic separation system flows back to the magnetic coagulation reaction system;
step four: a part of sludge in the quick settling tank flows back to the magnetic coagulation reaction system, the returned sludge is further mixed and reacted with the flocculation liquid, and all the sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, at the moment, colloidal flocs such as iron, aluminum and the like which do not completely participate in the reaction in the sludge can continuously participate in the coagulation action, the dosage of chemicals such as a coagulant, a flocculant and the like is reduced, the coagulation effect is improved, the concentration of particles in water can be increased by the returned sludge, the particles are convenient to aggregate and settle, so that larger and more compact alum flocs are formed in the flocculation process, and after the system operates for a period of time, when the amount of settled sludge in the quick settling tank is increased, the sludge in the quick settling tank is transmitted to the magnetic;
step five: all sludge in the rapid sedimentation tank enters a magnetic recovery system, all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, and the sludge in the rapid sedimentation tank directly enters the magnetic recovery system, so that the hydraulic load of the magnetic separation system can be effectively improved;
step six: all sludge in the quick settling tank enters the magnetic recovery system, magnetic powder recovery is carried out together with all sludge entering the magnetic recovery system through the magnetic separation system, and discharge of residual sludge is realized.
Example 1
The throughput of the present example is 2000m3And d, purifying the river water body with low suspended matter concentration at a certain position, wherein the SS (suspended solid) of the inlet water is designed to be less than or equal to 100mg/L, and the SS standard of the outlet water is designed to be less than or equal to 10 mg/L. After sewage enters a magnetic coagulation reaction system, firstly, the sewage is rapidly stirred to be rapidly combined with a coagulant (PAC) and magnetic powder, then alum floc is formed under the action of a coagulant aid (PAM) in a slow stirring process, the sewage after uniform mixing enters a rapid sedimentation tank to be rapidly precipitated, a part of the alum floc is sedimentated in the rapid sedimentation tank, the alum floc which is not sedimentated automatically flows to a magnetic separation system along with the sewage to be subjected to solid-liquid separation, a part of sludge which is sedimentated and intercepted to the bottom of the tank is continuously refluxed to the coagulation system, and after the magnetic separation system finishes the solid-liquid separation process, the sludge is refluxed to the magnetic coagulation reaction system, so that the content of particles in the coagulation reaction process is maintained, and the coagulation reaction is promoted to be carried out;
the high-efficiency sludge backflow system and the method thereof adopt the reinforced magnetic coagulation separation process, data of one month of the operation period of the system is intercepted and shown in figure 2, during the operation period, the concentration of influent suspended matters is 55-108 mg/L, the sludge backflow amount in the quick settling tank is adjusted while the sludge backflow of the magnetic separation system is ensured according to the change of influent water quality, the sludge backflow ratio is controlled to be 8:1, the sludge backflow concentration is 400-800 mg/L, as shown in figure 2, the effluent SS can be stabilized below 10mg/L, and the removal rate can reach more than 90%. After the magnetic coagulation reaction system continuously reacts for a period of time, the deposited sludge in the quick sedimentation tank becomes more, the sludge deposited in the quick sedimentation tank is discharged into the magnetic recovery system, the sludge backflow of the quick sedimentation tank is continuously carried out at the moment, the sludge backflow amount and the sludge discharge amount are flexibly controlled, the impact load resistance of the magnetic separation system is improved, the system treatment effect is prevented from being influenced by the fluctuation of the water quality of inlet water and the excessive sludge deposited in the quick sedimentation tank, the system stability is improved, the circulating work is carried out, the backflow sludge is fully utilized, the agent adding amount is reduced while the sludge load and the hydraulic load on the surface of the quick sedimentation tank are improved, the magnetic powder is prevented from being repeatedly added, and the high-efficiency removal of solid suspended matters.
Example 2
The processing amount of the present example was 10000m3And d, the method is used for treating the initial rainwater stored in the regulation and storage tank in a certain place and reducing pollution factors of suspended matters and total phosphorus in the initial rainwater. The water quality of inlet water is designed to be SS less than or equal to 200mg/L and total phosphorus less than or equal to 2 mg/L. The water quality standard of the effluent is designed to be SS less than or equal to 20mg/L or the removal rate is greater than or equal to 90 percent and the total phosphorus is less than or equal to 0.5 mg/L.
After sewage enters a magnetic coagulation reaction system, firstly, the sewage is rapidly stirred to be rapidly combined with a coagulant (PAC) and magnetic powder, then alum floc is formed under the action of a coagulant aid (PAM) in a slow stirring process, the sewage after uniform mixing enters a rapid sedimentation tank to be rapidly precipitated, a part of the alum floc is sedimentated in the rapid sedimentation tank, the alum floc which is not sedimentated automatically flows to a magnetic separation system along with the sewage to be subjected to solid-liquid separation, sludge sedimentated and intercepted to the bottom of the tank continuously enters a magnetic recovery system, and the sludge subjected to solid-liquid separation in the magnetic separation system flows back to the magnetic coagulation reaction system, so that the content of particles in the coagulation reaction process is maintained, and the coagulation reaction is promoted to be carried out;
the efficient sludge backflow system and the method thereof adopt the reinforced magnetic coagulation separation process, data of one month of operation period of the system are intercepted and shown in figures 4 and 5, during the operation period, the concentration of inflow suspended matters fluctuates up and down within the range of 100-216 mg/L, the sludge backflow amount of the magnetic separation system is adjusted along with the change of the concentration of the inflow suspended matters, the backflow ratio is controlled to be 3:1, and the sludge backflow concentration is controlled to be 300-600 mg/L. As shown in FIG. 4, the SS content in the effluent can be stabilized below 20mg/L, and the average removal rate can reach more than 92%. In addition, the high-efficiency removal of total phosphorus can be realized, and the effluent total phosphorus is lower than 0.5mg/L and is better than the effluent index as shown in figure 5.
Example 3
The processing amount of the present example was 5000m3And d, purifying the river water body with low suspended matter concentration at a certain position, wherein the SS (suspended solid) of the inlet water is designed to be less than or equal to 500mg/L, and the SS standard of the outlet water is designed to be less than or equal to 20 mg/L. When the sewage with suspended matter concentration higher than 300mg/L enters a magnetic coagulation reaction system, the sewage is rapidly mixed with a coagulant (PAC) and magnetic powder and then is slowly mixed in a coagulant aid (PA)M) to form alum flocs, mixing uniformly, entering a quick sedimentation tank along with sewage to perform coagulating sedimentation, settling a part of alum flocs in the quick sedimentation tank, and automatically flowing the alum flocs which are not settled into a magnetic separation system along with the sewage to perform solid-liquid separation.
Because of the high-efficiency sedimentation function of the quick sedimentation tank, a large amount of settled sludge can be stored in a sludge hopper at the bottom of the quick sedimentation tank, the sludge is conveyed to a magnetic recovery system through sludge discharge, all the sludge separated in the magnetic separation system also enters the magnetic recovery system, the sludge entering the magnetic recovery system is separated to recover magnetic powder, the magnetic powder is thrown into the front end of the coagulation box body again to continue to participate in reaction, and the sludge in the magnetic recovery system is finally discharged in the form of residual sludge, thereby avoiding repeatedly adding magnetic powder, improving the utilization rate of the magnetic powder, transmitting the sludge to a magnetic recovery system through the sludge discharge process, the hydraulic load of a magnetic separation system can be improved, the running stability of equipment is improved, the concentration of inflow suspended matters is 280-530 mg/L during operation as shown in figure 7, the SS of outflow water is stabilized below 20mg/L, the removal rate is more than 97%, and the high-efficiency removal of Suspended Solids (SS) in high-concentration sewage is realized.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (4)
1. A high-efficiency sludge backflow system for strengthening a magnetic coagulation separation process is characterized by comprising a magnetic coagulation reaction system, a quick sedimentation tank, a magnetic separation system and a magnetic recovery system which are communicated with one another in sequence;
the magnetic coagulation reaction system is divided into a fast reaction tank and a slow coagulation tank, and is connected with a dosing system;
the dosing system respectively adds coagulant and magnetic powder into the rapid reaction tank, and adds coagulant aid into the slow coagulation tank;
the rapid sedimentation tank is a pre-sedimentation reaction tank, alum floc generated after the reaction of a coagulant, a coagulant aid and return sludge is subjected to pre-sedimentation treatment in the tank, a sludge hopper is arranged at the bottom of the tank to store the sedimentation sludge, and the bottom of the rapid sedimentation tank is in an inverted trapezoid shape;
the high-efficiency sludge return system is characterized in that when the concentration of suspended matters in influent sewage of the magnetic coagulation reaction system is less than 100 mg/L: returning part of sludge in the quick sedimentation tank to the magnetic coagulation reaction system, and returning all sludge in the magnetic separation system to the magnetic coagulation reaction system, wherein the sludge return ratio is the ratio of the amount of returned sludge to the amount of water-feeding sludge, and is (5-10): 1, and the amount of returned sludge is the sum of the amount of returned sludge in the quick sedimentation tank and the amount of returned sludge in the magnetic separation system;
when the concentration of the water inlet sewage suspended matters of the magnetic coagulation reaction system is 100-300 mg/L, all sludge in the rapid sedimentation tank is transmitted to the magnetic recovery system, all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, the sludge reflux ratio is the ratio of the reflux sludge amount of the magnetic separation system to the water inlet sludge amount, and is (1-5): 1, the amount of the return sludge is the amount of the return sludge of the magnetic separation system;
when the concentration of the influent sewage suspended matters of the magnetic coagulation reaction system is more than 300mg/L, all sludge in the quick sedimentation tank is transmitted to the magnetic recovery system, and all sludge in the magnetic separation system enters the magnetic recovery system.
2. A high-efficiency sludge backflow method for strengthening a magnetic coagulation separation process is characterized by comprising the following steps:
the method comprises the following steps: the sewage enters a magnetic coagulation reaction system, coagulant and magnetic powder are added through a dosing system and then are rapidly stirred, and the powdery magnetic powder is combined with floc in the coagulation process to form high-density floc with the magnetic powder as a core;
step two: adding coagulant aid, stirring at a low speed, then allowing the sewage to enter a quick sedimentation tank for continuous coagulation sedimentation, and storing partial sedimentation sludge in a sludge hopper at the bottom of the tank;
step three: in the quick settling tank, flocculate enters a magnetic separation system along with effluent through a water outlet tank for solid-liquid separation, supernatant flows out through a water outlet, and all sludge separated by the magnetic separation system flows back to the magnetic coagulation reaction system;
step four: a part of sludge in the rapid sedimentation tank flows back to the magnetic coagulation reaction system, the returned sludge is further mixed and reacted with the flocculation liquid, and all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, at the moment, colloidal flocs such as iron, aluminum and the like which do not completely participate in the reaction in the sludge can continuously participate in the coagulation action, the dosage of chemicals such as a coagulant, a flocculating agent and the like is reduced, the coagulation effect is improved, the concentration of particles in water can be increased by the returned sludge, and the particles are convenient to aggregate and settle so that larger and more compact alum flocs are formed in the flocculation process;
step five: the other part of sludge in the quick sedimentation tank enters a magnetic recovery system, all sludge in the magnetic separation system flows back to the magnetic coagulation reaction system, and the sludge in the quick sedimentation tank directly enters the magnetic recovery system, so that the hydraulic load of the magnetic separation system can be effectively improved.
3. The method for high-efficiency sludge backflow for strengthening the magnetic coagulation separation process according to claim 2, wherein in the rapid sedimentation tank, one part of the sludge which is settled and trapped at the bottom of the tank continuously flows back to the magnetic coagulation reaction system, and the other part of the sludge directly enters the magnetic recovery system.
4. The method for enhancing the efficiency of sludge recirculation in the magnetic coagulation separation process according to claim 2, wherein when the concentration of the suspended matters in the influent sewage of the magnetic coagulation reaction system is more than 300mg/L, no sludge recirculation occurs.
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| CN202011045113.5A CN112358116A (en) | 2020-09-28 | 2020-09-28 | Efficient sludge backflow system and method for reinforcing magnetic coagulation separation process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113023847A (en) * | 2021-03-11 | 2021-06-25 | 中节能兆盛环保有限公司 | Novel magnetic material recycling and lifting method and device for magnetic coagulation sedimentation |
| CN115974271A (en) * | 2023-02-07 | 2023-04-18 | 北京沃尔德斯水务科技有限公司 | Magnetic biological reaction system and water treatment process |
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