CN113636699A - Technical method for efficient algae-laden water separation of eutrophic water body - Google Patents
Technical method for efficient algae-laden water separation of eutrophic water body Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000000926 separation method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 22
- 241000195493 Cryptophyta Species 0.000 claims abstract description 156
- 239000002002 slurry Substances 0.000 claims abstract description 90
- 230000003647 oxidation Effects 0.000 claims abstract description 34
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 34
- 238000004062 sedimentation Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 208000005156 Dehydration Diseases 0.000 claims abstract description 12
- 230000018044 dehydration Effects 0.000 claims abstract description 12
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 8
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- 238000006243 chemical reaction Methods 0.000 claims description 22
- 150000001768 cations Chemical class 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
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- 230000014759 maintenance of location Effects 0.000 claims description 5
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- 239000007787 solid Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 10
- 239000011574 phosphorus Substances 0.000 abstract description 10
- 238000000746 purification Methods 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
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- 159000000013 aluminium salts Chemical class 0.000 description 4
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 4
- 238000005188 flotation Methods 0.000 description 3
- 230000001699 photocatalysis Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 239000013049 sediment Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 108700012359 toxins Proteins 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
- C02F1/64—Heavy metal compounds of iron or manganese
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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Abstract
The invention discloses a technical method for efficient algae-laden water separation of eutrophic water, belonging to the technical field of sewage treatment. In the invention, polyaluminium salt is added in the algae-laden water separation and purification process to pretreat algae-laden water, and the amount of concentrated algae slurry is reduced to 3-5% of the original algae water amount; introducing the pretreated concentrated algae slurry into a two-stage cavitation pressure wall breaking device; carrying out advanced oxidation treatment on the algae slurry after wall breaking under the condition of pH value of 4.5-5.0, adjusting the pH value to be neutral, completing solid-liquid separation through an inclined plate sedimentation tank, directly discharging clear liquid at the upper part of the sedimentation tank into a raw water lake, and conveying the algae residue obtained at the bottom of the sedimentation tank to an algae residue tank for subsequent dehydration treatment. According to the invention, the land occupation area of treatment facilities is obviously reduced while high-efficiency algae-laden water separation is realized, the chemical oxygen demand of the final effluent is obviously reduced, the phosphorus content is low to an undetectable level, and the dehydration performance of algae residues is also obviously improved.
Description
Technical Field
The invention relates to a technical method for efficient algae-laden water separation of eutrophic water, belonging to the technical field of sewage treatment.
Background
Eutrophication of water bodies and cyanobacterial bloom caused by the eutrophication are important environmental problems faced by a plurality of lakes and reservoirs in China at present. The mass propagation of blue algae consumes a large amount of oxygen in the water body, thereby affecting the growth of other aerobic organisms, causing high turbidity of the water body and emitting unpleasant odor, further destroying the balance of an aquatic ecosystem, and finally affecting the life and social development of people. In order to relieve the adverse effect of the cyanobacterial bloom on the water environment, the water pollution treatment project pumps the eutrophic water body rich in algae to an algae-water separation station for special treatment, the eutrophic water body rich in algae comprises a physical filtration and concentration system, air pressure wall breaking, dosing flocculation and precipitation, air flotation and algae residue dehydration which are main process units, and supernatant of a physical filtration tank and water discharged from the air flotation tank return to a raw water lake for receiving. The technology has mature process, low control difficulty and moderate operation and treatment cost, thereby being popularized and applied in engineering practice.
The prior utility model ZL201921051494.0 relates to a blue algae deep dehydration wastewater treatment system, algae water is separated by a regulating tank, a mixing tank, a coagulation tank and an inclined plate sedimentation tank, the effluent is treated by biochemical reaction units such as an up-flow anaerobic sludge tank, an anoxic tank, an aerobic tank and a membrane biological reaction tank, and the effluent is discharged back to the original lake water body; this patent aims at solving the COD clearance when algae water separation and hangs down, Ca gets rid of the degree of difficulty greatly, handles degree of depth not enough this type of problem, nevertheless goes out water COD concentration not very high after most algae water separation station sediment water separation, if adopt biochemical treatment system to go out water purification treatment again, and the carbon source will obviously be not enough to influence biochemical system's operation treatment effect. The prior patent ZL201010520895.3 discloses a system and a method for oxidizing blue algae by using a supercritical technology, and organic matters in a water body are thoroughly oxidized after the blue algae polluted water body is treated; the technology is difficult to treat lake blue-green algae polluted water bodies on a large scale due to the limitation of high-temperature and high-pressure operation conditions of the supercritical device, the operation cost is relatively high, and the operation control is relatively complex. The method also researches the adoption of hydrodynamic cavitation coupled micro-nano aeration to enhance photocatalysis and remove microalgae, and the treatment device comprises a ship body, and a hydrodynamic cavitation generating device, a micro-nano aeration device and a photocatalysis guide cylinder group which are arranged on the ship bodyTo form, by using TiO2The catalyst and ultraviolet illumination are used for carrying out catalytic oxidation on organic matters in the algae water after wall breaking; but is influenced by higher suspended matters, higher chromaticity and the like in the algae water, the photocatalytic conversion efficiency of organic matters in the algae water is obviously lower, and the phosphorus content in the algae water is not substantially reduced.
The novel technology for treating the blue algae polluted water body developed at present has new progress in the aspects of convenient and fast operation and control of treatment facilities and relatively thorough oxidation of organic matters in the water body, but compared with the conventional algae-water separation technology which mainly comprises physical filtration and concentration, air pressure wall breaking, medicine adding and flocculation and air floatation, the novel technology has no obvious advantages in the aspects of large treatment scale, operation cost and process regulation and control, thereby limiting the popularization and application of the novel technology in engineering practice. Certainly, the conventional algae-laden water separation process mainly adopts physical action modes such as physical filtration, flocculation precipitation and dissolved air floatation, so that organic matters, phosphorus and other components in the water body are difficult to effectively purify and treat, the water content of the algae residues after dehydration is as high as nearly 90%, and the difficulty of subsequent transportation and treatment is large. Therefore, the conventional algae-laden water separation process still has certain defects in the aspects of efficient separation and purification of algae-laden water, dehydration of algae residues and the like, and needs to be further improved and promoted.
Disclosure of Invention
The invention provides a technical method for separating eutrophic water from algae efficiently. Aiming at the characteristics that the eutrophic water body has relatively high content of organic matters and phosphorus, and blue algae contains colloid air bags, polyaluminium salts are firstly added in the algae-laden water separation and purification process to pretreat algae water, so that the amount of concentrated algae slurry is greatly reduced; two-stage cavitation pressure wall breaking equipment is introduced to carry out wall breaking treatment on the pretreated concentrated algae slurry, so that the effect of subsequent flocculation sedimentation is improved; and (3) treating the algae slurry after wall breaking by a Fenton oxidation or electro-Fenton oxidation mode, then adjusting the pH value to be neutral, and completing solid-liquid separation in an inclined plate sedimentation tank. After treatment, the content of organic matters and phosphorus in the supernatant of the sedimentation tank is obviously reduced compared with the content of the organic matters and the phosphorus in the conventional algae-laden water separation process, and the dehydration performance of the algae residues obtained at the bottom of the sedimentation tank is also effectively improved.
The implementation steps of the invention are as follows:
(1) pumping the eutrophic water body rich in algae into a pretreatment reaction tank by using a suction pump, concentrating the content of algae solids to 0.5-2%, returning the upper clear liquid into the original water lake, and reducing the amount of concentrated algae slurry to 3-5% of the original algae water amount;
(2) automatically flowing the concentrated algae slurry at the bottom of the pretreatment reaction tank to an algae slurry tank, and conveying the concentrated algae slurry to a two-stage cavitation pressure wall breaking device through a centrifugal pump;
(3) performing advanced oxidation treatment on the algae slurry subjected to wall breaking in the step (2), and controlling the pH of a reaction system to be 4.5-5.0;
(4) adjusting the pH value of the algae slurry subjected to oxidation treatment in the step (3) to be neutral, completing solid-liquid separation through an inclined plate sedimentation tank, directly discharging clear liquid at the upper part of the sedimentation tank into an original water lake, automatically flowing algae residues obtained at the bottom of the sedimentation tank into an algae residue tank, and then performing dehydration treatment.
Preferably, polyaluminium salt is added in the step (1) to pretreat the algae water, the adding amount of the reagent is determined according to the concentration of the aluminium salt in a pretreatment reaction tank of 15-17 mg/L, and the retention time of the algae water in the reaction tank is 25 min.
Preferably, the pressure wall breaking of the algae slurry is realized by two-stage cavitation in the step (2). Sending the algae slurry into a wall breaking container through a Venturi tube, uniformly arranging 3 or 4 air inlet branch pipes around a throat pipe of the Venturi tube, introducing air with the pressure of 4-5 atm, and enabling the algae slurry to realize primary cavitation and breaking; the algae slurry flows into the wall breaking container through the gradually expanding pipe of the Venturi pipe, and is fully mixed with the air of 3-4 atm introduced from the top of the container again to realize secondary cavitation and crushing of the algae slurry.
Preferably, when the advanced oxidation treatment in the step (3) is realized by adding metal cations and hydrogen peroxide, the mass addition amount of the hydrogen peroxide is 0.5 percent of the algae pulp to be treated, and the molar ratio of the metal cations to the hydrogen peroxide is 1: 2.
preferably, the metal cation added by the advanced oxidation technology in the step (3) is Fe2+Or Fe2+With Mn2+Mixture of Fe2+ + H2O2→Fe3+ + OH-+ ·OH，Mn2++ H2O2→Mn3++ OH-OH. The generated hydroxyl free radicals oxidize organic components, phosphorus, a small amount of algae poison and the like in the water body, and the content of the hydroxyl free radicals is effectively reduced. The metal cation is Fe2+、Mn2+In the case of mixtures, the molar ratio of the two is 1: 0.1.
preferably, when the advanced oxidation treatment in step (3) is carried out by the electro-Fenton technique, the iron or iron-manganese electrode is an anode, the inert electrode is a cathode, and aeration is carried out at the cathode. Anode: fe-2 e-→Fe2+(ii) a Cathode: o is2+2H++2e-→H2O2(ii) a In the solution system: fe2+ + H2O2→Fe3+ + OH-+ ·OH。
Preferably, when the advanced oxidation treatment in step (3) is carried out by the electro-Fenton technique, the oxidation treatment tank is supplied with a constant current of 100 mA, and the aeration intensity at the cathode plate is 12-13L/m3·s。
Preferably, after the pH of the algae slurry is adjusted to be neutral in the step (4), Fe3++ 3OH- →Fe(OH)3And ↓, which stays in the inclined plate sedimentation tank for 25 min to complete solid-liquid separation.
The invention has the technical effects that:
1) in the algae-laden water separation process, a pretreatment unit for adding polyaluminium salt is arranged before the wall breaking of algae slurry, the amount of concentrated algae slurry is reduced to 3% -5% of the original algae water amount, and the treatment load of the polluted water body of the algae-laden water separation station is obviously improved.
2) The secondary cavitation pressure wall breaking equipment is adopted to carry out wall breaking treatment on the pretreated concentrated algae slurry, so that the precipitation effect of algae residues is improved, but algae cells are not excessively punctured, and the content of organic matters in water body clear liquid is not obviously increased.
3) Aiming at the defects of high content of organic matters and phosphorus in the effluent water of the conventional algae-laden water separation process, the invention introduces an advanced oxidation technology to properly treat the water body, has short action time, and effectively reduces the organic components in the water body and the pollution components such as phosphorus and even a small amount of released algae toxins. After the algae slurry is oxidized, the pH value is adjusted to be neutral, and the algae residue obtained by solid-liquid separation has good dehydration performance.
Detailed Description
The present invention is described in detail with reference to the following specific examples, which are carried out on the premise of the technical solution of the present invention, and the detailed implementation manner and the specific operation process are given, but the protection scope of the present invention is not limited to the contents.
Example 1
The specific operation is as follows:
(1) pumping the eutrophic water body rich in algae into a pretreatment reaction tank by using a suction pump, adding polyaluminium salt to ensure that the concentration of the aluminium salt in the reaction tank is 10 mg/L, discharging the supernatant to the original water body after 25 min, measuring the solid content of the lower algae slurry to be 0.65 percent, reducing the concentrated algae slurry to 4.5 percent of the original algae water amount, and filtering and concentrating by using the conventional algae water process to be 40 percent of the original water amount.
(2) In this embodiment, the concentrated algae slurry at the bottom of the pretreatment reaction tank in step (1) automatically flows to an algae slurry tank, and is delivered to a two-stage cavitation pressure wall breaking device by a centrifugal pump. Sending the algae slurry into a wall breaking container through a Venturi tube, uniformly arranging 3 air inlet branch pipes around a throat pipe of the Venturi tube, and introducing air with the pressure of 4 atm to ensure that the algae slurry is subjected to primary cavitation and crushing; the algae slurry flows into the wall breaking container through the gradually expanding pipe of the Venturi pipe, and is fully mixed with the air of 3 atm introduced from the top of the container again to realize secondary cavitation and crushing of the algae slurry.
(3) Sending the crushed algae slurry to an oxidation treatment tank, adjusting the pH value of the algae slurry to 4.8, and sequentially adding metal cation Fe2+Hydrogen peroxide and the adding amount of the hydrogen peroxide is 0.1 percent of the algae slurry to be treated, and Fe2+And H2O2The molar ratio is 1: 1.
(4) adjusting the pH value of the algae slurry after the oxidation treatment to be neutral, setting the retention time of algae water in an inclined plate sedimentation tank to be 30 min, and taking the lower algae residue to measure the CST.
The conventional algae-laden water separation process comprises the following steps: physical filtration and concentration, air pressure wall breaking, dosing and flocculation, air flotation, the phosphorus content of the treated effluent is 0.4-0.5 mg/L, and the CST of the algae residue before dehydration is generally 51-54 s.
In the embodiment 1, the content of orthophosphate in the effluent is low to an undetectable level, the content of the algae residue CST is reduced to 25 s, and the dehydration performance index is obviously improved.
Example 2
(1) Pumping the eutrophic water body rich in algae into a pretreatment reaction tank by using a suction pump, adding polyaluminium salt to ensure that the concentration of the aluminium salt in the reaction tank is 16 mg/L, discharging the supernatant to the original water body after 25 min, taking the lower algae slurry to measure that the solid content is 1.6 percent, and reducing the amount of the concentrated algae slurry to 3.6 percent of the original algae water amount.
(2) In this embodiment, the concentrated algae slurry at the bottom of the pretreatment reaction tank in step (1) automatically flows to an algae slurry tank, and is delivered to a two-stage cavitation pressure wall breaking device by a centrifugal pump. Sending the algae slurry into a wall breaking container through a Venturi tube, uniformly arranging 4 air inlet branch pipes around a throat pipe of the Venturi tube, and introducing air with the pressure of 5 atm to ensure that the algae slurry is subjected to primary cavitation and crushing; the algae slurry flows into the wall breaking container through the gradually expanding pipe of the Venturi pipe, and is fully mixed with the air of 3 atm introduced from the top of the container again to realize secondary cavitation and crushing of the algae slurry.
(3) Sending the crushed algae slurry to an oxidation treatment tank, adjusting the pH value of the algae slurry to 5.0, and sequentially adding metal cation Fe2+Hydrogen peroxide, the adding amount of the hydrogen peroxide is 1 percent of the algae slurry to be treated, and Fe2+And H2O2The molar ratio is 1: 2.
(4) adjusting the pH value of the algae slurry after the oxidation treatment to be neutral, setting the retention time of algae water in an inclined plate sedimentation tank to be 25 min, and taking the lower algae residue to measure the CST.
In this example, the content of orthophosphate in the effluent was as low as undetectable level, and the algal residue CST was reduced to 17 s, with a reduction rate of 68%.
Example 3
(1) Step (1) in this example is identical to step (1) in example 2.
(2) In this embodiment, the concentrated algae slurry at the bottom of the pretreatment reaction tank in step (1) automatically flows to an algae slurry tank, and is delivered to a two-stage cavitation pressure wall breaking device by a centrifugal pump. Sending the algae slurry into a wall breaking container through a Venturi tube, uniformly arranging 4 air inlet branch pipes around a throat pipe of the Venturi tube, and introducing air with the pressure of 4 atm to ensure that the algae slurry is subjected to primary cavitation and crushing; the algae slurry flows into the wall breaking container through the gradually expanding pipe of the Venturi pipe, and is fully mixed with the air of 3 atm introduced from the top of the container again to realize secondary cavitation and crushing of the algae slurry.
(3) Sending the crushed algae slurry to an oxidation treatment tank, adjusting the pH value of the algae slurry to 4.5, and sequentially adding metal cations (Fe)2+With Mn2+Mixture) and hydrogen peroxide, Fe2+With Mn2+The molar ratio is 1: 0.1, the adding amount of hydrogen peroxide is 0.5 percent of the algae slurry to be treated, and the metal cations and H2O2The molar ratio is 1: 1.
(4) adjusting the pH value of the algae slurry after the oxidation treatment to be neutral, keeping the algae slurry in an inclined plate sedimentation tank for 20 min to complete solid-liquid separation, and taking the lower algae residue to measure the CST.
In this example, the orthophosphate content in the effluent was as low as undetectable, and the algal residue CST was reduced to 18 seconds.
Example 4
(1) Pumping the eutrophic water body rich in algae into a pretreatment reaction tank by using a suction pump, adding polyaluminium salt to ensure that the concentration of the aluminium salt in the reaction tank is 20 mg/L, discharging the supernatant to the original water body after 20 min, taking the lower algae slurry to measure that the content of solid matters is 1.8 percent, and reducing the amount of the concentrated algae slurry to 3.5 percent of the amount of the original algae water.
(2) In this embodiment, the concentrated algae slurry at the bottom of the pretreatment reaction tank in step (1) automatically flows to an algae slurry tank, and is delivered to a two-stage cavitation pressure wall breaking device by a centrifugal pump. Sending the algae slurry into a wall breaking container through a Venturi tube, uniformly arranging 3 air inlet branch pipes around a throat pipe of the Venturi tube, and introducing air with the pressure of 5 atm to ensure that the algae slurry is subjected to primary cavitation and crushing; the algae slurry flows into the wall breaking container through the gradually expanding pipe of the Venturi pipe, and is fully mixed with air of 4 atm introduced from the top of the container again to realize secondary cavitation and crushing of the algae slurry.
(3) Sending the crushed algae slurry to an oxidation treatment tank, adjusting the pH value of the algae slurry to 4.5, and sequentially adding metal cations (Fe)2+With Mn2+Mixture) and hydrogen peroxide, Fe2+With Mn2+The molar ratio is 1: 0.1, dioxygenThe water adding amount is 1 percent of the algae slurry to be treated, and the metal cations and H2O2The molar ratio is 1: 3.
(4) adjusting the pH value of the algae slurry after the oxidation treatment to be neutral, staying in an inclined plate sedimentation tank for 25 min to complete solid-liquid separation, and taking the lower algae residue to measure the CST.
In this example, the orthophosphate content in the effluent was as low as undetectable, and the algal residue CST was reduced to 18 seconds.
Example 5
(1) Step (1) in this example is the same as step (1) in example 1.
(2) Step (2) in this example is the same as step (2) in example 3.
(3) Sending the crushed algae slurry to an oxidation treatment tank, adjusting the pH value of the algae slurry to 4.7, carrying out oxidation treatment on algae water by adopting an electro-Fenton technology, wherein an iron electrode is an anode, an inert electrode is a cathode, and the oxidation treatment tank is electrified to apply a constant current of 90 mA; at the same time, the cathode is aerated, and the aeration intensity at the cathode plate is 10L/m3·s。
(4) Adjusting the pH value of the algae slurry after the oxidation treatment to be neutral, staying in an inclined plate sedimentation tank for 30 min to complete solid-liquid separation, and taking the lower algae residue to determine the CST.
In this example, the orthophosphate content in the effluent was as low as undetectable, and the algal residue CST was reduced to 19 s.
Example 6
Sending the algae slurry subjected to secondary cavitation pressure wall breaking to an oxidation treatment tank, adjusting the pH value to 5.0, carrying out oxidation treatment on algae water by adopting an electro-Fenton technology, wherein an iron-manganese electrode is used as an anode, an inert electrode is used as a cathode, and a constant current of 120 mA is applied to the oxidation treatment tank; at the same time, the cathode is aerated, and the aeration intensity at the cathode plate is 12L/m3S. The rest of the operation was the same as in example 5.
And (3) after the algae slurry after the oxidation treatment is subjected to solid-liquid separation in an inclined plate sedimentation tank, wherein the CST of the lower algae residue is 19 s, and the content of orthophosphate in the upper clear water is low to a level which cannot be detected.
Claims (8)
1. A technical method for separating eutrophic water from algae efficiently is characterized by comprising the following steps:
(1) pumping the eutrophic water body rich in algae into a pretreatment reaction tank by using a suction pump, and obtaining upper clear liquid and bottom concentrated algae slurry through pretreatment, wherein the content of solids in the concentrated algae slurry is 0.5-2%, the upper clear liquid returns to the original water lake, and the amount of the concentrated algae slurry is reduced to 3-5% of the amount of the original algae;
(2) automatically flowing the concentrated algae slurry at the bottom of the pretreatment reaction tank to an algae slurry storage tank, and conveying the concentrated algae slurry to a two-stage cavitation pressure wall breaking device through a centrifugal pump;
(3) performing advanced oxidation treatment on the algae slurry subjected to wall breaking in the step (2), and controlling the pH of a reaction system to be 4.5-5.0;
(4) adjusting the pH value of the algae slurry subjected to oxidation treatment in the step (3) to be neutral, realizing solid-liquid separation through an inclined plate sedimentation tank, directly discharging clear liquid at the upper part of the sedimentation tank into an original water lake, conveying the algae residues obtained at the bottom of the sedimentation tank to an algae residue tank, and then performing dehydration treatment.
2. The technical method for the efficient algae-laden water separation of the eutrophic water body according to claim 1, wherein polyaluminum salts are added in the step (1) to pretreat the algae-laden water, the adding amount of the reagent is determined according to the concentration of the aluminum salts in the reaction tank being 6-20 mg/L, and the retention time of the algae-laden water in the reaction tank is 20-30 min.
3. The technical method for the efficient algae-laden water separation of the eutrophic water body according to claim 1, wherein the pressure wall breaking of the algae slurry is realized by two-stage cavitation in the step (2); sending the algae slurry into a wall breaking container through a Venturi tube, uniformly arranging 3 or 4 air inlet branch pipes around a throat pipe of the Venturi tube, introducing air with the pressure of 4-5 atm, and enabling the algae slurry to realize primary cavitation and breaking; the algae slurry flows into the wall breaking container through the gradually expanding pipe of the Venturi pipe, and is fully mixed with the air of 3-4 atm introduced from the top of the container again to realize secondary cavitation and crushing of the algae slurry.
4. The technical method for separating the eutrophic water body from the algae water with high efficiency according to claim 1, wherein the advanced oxidation treatment in the step (3) is realized by adding metal cations and hydrogen peroxide, the mass addition amount of the hydrogen peroxide is 0.1-1% of the algae slurry to be treated, and the molar ratio of the metal cations to the hydrogen peroxide is 1: (1-3).
5. The technical method for the efficient algae-laden water separation of the eutrophic water body according to claim 4, wherein the metal cations are Fe2+Or Fe2+With Mn2+Mixture of metal cations of Fe2+、Mn2+In the case of mixtures, the molar ratio of the two is 1: (0.05-0.2).
6. The technical method for separating the eutrophic water body from the algae water with high efficiency according to claim 1, wherein the advanced oxidation treatment in the step (3) can also be realized by adopting electro-Fenton technology, an iron or iron-manganese electrode is used as an anode, an inert electrode is used as a cathode, and aeration is carried out on the cathode.
7. The technical method for the efficient algae-laden water separation of the eutrophic water body as set forth in claim 6, wherein the constant current of 80-120 mA is applied to the oxidation treatment tank, and the aeration intensity at the cathode plate is 10-15L/m3·s。
8. The technical method for separating the eutrophic water body from the algae water with high efficiency according to the claim 1, wherein the retention time of the algae slurry in the inclined plate sedimentation tank is 20-35 min after the pH value of the algae slurry in the step (4) is adjusted to be neutral so as to realize solid-liquid separation.
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