CN109650697B - Pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria - Google Patents
Pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria Download PDFInfo
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Abstract
The invention belongs to the technical field of environmental engineering, relates to the technical field of water bloom blue algae treatment, and particularly relates to a pretreatment method for plate-frame filter pressing of water bloom blue algae, which comprises the following steps: step 1, diluting and stirring initial algae mud obtained after pre-dehydration of bloom-forming cyanobacteria to obtain algae-water mixed liquor with the water content of 95%; step 2, sequentially adding ferrous sulfate powder and hydrogen peroxide into the algae-laden water mixed solution, and fully stirring to obtain a mixed solution A; and 3, sequentially adding the polyaluminum ferric chloride medicament and the quick lime into the mixture A, and uniformly stirring to obtain the pre-conditioned water hualan algae solution. The invention solves the problem that the existing technology can not treat the water bloom blue algae mud with the water content of 85-90%, and the water bloom blue algae is pretreated by dilution and multiple reaction modes, thereby facilitating the subsequent plate-and-frame filter pressing and improving the filter pressing effect.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, relates to the technical field of water bloom blue algae treatment, and particularly relates to a pretreatment method for plate-frame filter pressing of water bloom blue algae.
Background
In recent years, many lake water bodies in China are in a eutrophication trend, and the Dian lake and the Taihu lake are the most typical. These lakes often have bloom-forming cyanobacteria outbreaks, which affects drinking water safety and ecological environment. At present, the treatment method for excessive bloom-forming cyanobacteria in water at home and abroad can be divided into a physical method, a chemical method, a biological method and the like. The physical method taking salvage as a main measure is one of the current domestic common means for controlling the bloom-forming cyanobacteria, and the algae-rich water which is salvaged or filtered is a liquid substance with the water content of 98-99 percent. During the outbreak period of the bloom-forming cyanobacteria, thousands of tons of the bloom-forming cyanobacteria are fished or filtered in the Taihu lake every day, although the bloom-forming cyanobacteria are fished or filtered, the further deterioration of the water quality of lake water is avoided, the water content of the lake water is high, the water content of the bloom-forming cyanobacteria is reduced from 99% to 85-90% through the chemical feeding and centrifugal dewatering machine after the bloom-forming cyanobacteria are primarily concentrated through the bloom-forming cyanobacteria separation station, the initial algae mud is formed, but the water content is still too high, although the filtration medium can be reduced to the water content below 60% at the minimum through the plate and frame filter press, most of the water of the initial algae mud is in cells, viscous polysaccharide organic matters are wrapped outside the cells, and the plate and frame filter press cannot.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a pretreatment method for plate-frame filter pressing of water bloom blue algae, which solves the problem that the prior art can not treat the water bloom blue algae mud with the water content of 85-90 percent, and the water bloom blue algae is pretreated in a dilution and multiple reaction mode, so that the subsequent plate-frame filter pressing is convenient, and the filter pressing effect can be improved.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria comprises the following steps:
step 1, diluting and stirring initial algae mud obtained after pre-dehydration of bloom-forming cyanobacteria to obtain algae-water mixed liquor with the water content of 95%;
step 2, sequentially adding ferrous sulfate powder and hydrogen peroxide into the algae-laden water mixed solution, and fully stirring to obtain a mixed solution A;
and 3, sequentially adding the polyaluminum ferric chloride medicament and the quick lime into the mixed solution A, and uniformly stirring to obtain the pre-conditioned water hualan algae solution.
The water content of the initial algae mud obtained by pre-dehydrating the bloom-forming cyanobacteria in the step 1 is 85-90%.
And (3) diluting the initial algae mud obtained after the pre-dehydration of the bloom-forming cyanobacteria in the step (1) to 95% algae-water mixed liquor by adding water.
The adding mass of the ferrous sulfate powder in the step 2 is 10-15% of the mass of the water-blooming cyanobacteria dry matter.
The addition amount of the hydrogen peroxide in the step 2 is 3-10% of the mass of the water-blooming cyanobacteria dry matter.
The stirring time for stirring uniformly in the step 2 is 0.5 h.
The adding amount of the polymeric aluminum ferric chloride medicament in the step 3 is 8-15% of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the quicklime in the step 3 is 3-10% of the mass of the water-blooming cyanobacteria dry matter.
And adding the polyaluminum ferric chloride medicament in the step 3, stirring for 0.5h, and adding quicklime.
Chain reaction between ferrous ions contained in the ferrous sulfate and hydrogen peroxide is catalyzed to generate hydroxyl free radicals, and organic matters in water can be oxidized in a non-selective manner. Because the viscous polysaccharide organic matters among the water-blooming cyanobacteria cells are wrapped with a large amount of water, the generation of hydroxyl free radicals can oxidize polysaccharide viscous substances among the cells in the water-blooming cyanobacteria mud, and the viscosity of the polysaccharide viscous substances is reduced, so that channels are opened in cell gaps to separate the water from the water-blooming cyanobacteria cells.
The hydroxyl radical has high electronegativity, can form strong addition reaction characteristic, has strong oxidizability and can react with polysaccharide viscous substances.
The polyaluminum ferric chloride is a flocculating agent with good flocculation effect; after the viscous polysaccharide substances are oxidized, the cell gaps are opened, the blue algae cells are not condensed, the blue algae cells are in a dispersed state after a large amount of water is released, the polyaluminum ferric chloride can flocculate the dispersed water-blooming cyanobacteria cells again, and the flocculated water-blooming cyanobacteria cells do not wrap a large amount of water because the polysaccharide viscous substances outside the cells are oxidized.
After polyaluminium ferric chloride is flocculated, quicklime reacts in water to generate alkaline slaked lime, the alkaline slaked lime and the strong acid polyaluminium ferric chloride added previously are subjected to acid-base neutralization, the pH of the final algae slurry is neutral or weak acid, the subsequent treatment environment is not influenced, meanwhile, under the condition that the cyanobacteria cells are flocculated by the polyaluminium ferric chloride, precipitation crystallization of the mature lime is formed among the cyanobacteria cells, the flocculation state of the polyaluminium ferric chloride is strengthened, the cyanobacteria cells are not in a free state any longer in the final conditioning process, and water outlet channels are formed among the cyanobacteria cells, so that water can be continuously released from the cyanobacteria cells under the condition of external force extrusion; meanwhile, the quick lime and the water can form an exothermic reaction, so that the blue algae cells can be quickly cured, the elasticity of the cells is reduced, the water in the cells can be quickly released, the water locking capacity of the cells is reduced, and the later-stage external force extrusion is facilitated.
From the above description, it can be seen that the present invention has the following advantages:
1. the invention solves the problem that the existing technology can not treat the water bloom blue algae mud with the water content of 85-90%, and the water bloom blue algae is pretreated by dilution and multiple reaction modes, thereby facilitating the subsequent plate-and-frame filter pressing and improving the filter pressing effect.
2. The invention utilizes the ferrous sulfate and the hydrogen peroxide to form hydroxyl free radicals, not only has the oxidation capability, but also has the addition reaction characteristic, and effectively releases the water among the blue algae cells.
Detailed Description
The present invention is described in detail with reference to examples, but the present invention is not limited to the claims.
Example 1
A pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria comprises the following steps:
step 1, diluting and stirring initial algae mud obtained after pre-dehydration of bloom-forming cyanobacteria to obtain algae-water mixed liquor with the water content of 95%;
step 2, sequentially adding ferrous sulfate powder and hydrogen peroxide into the algae-laden water mixed solution, and fully stirring to obtain a mixed solution A;
and 3, sequentially adding the polyaluminum ferric chloride medicament and the quick lime into the mixed solution A, and uniformly stirring to obtain the pre-conditioned water hualan algae solution.
The water content of the initial algae mud obtained by pre-dehydrating the bloom-forming cyanobacteria in the step 1 is 85-90%.
And (3) diluting the initial algae mud obtained after the pre-dehydration of the bloom-forming cyanobacteria in the step (1) to 95% algae-water mixed liquor by adding water.
The adding mass of the ferrous sulfate powder in the step 2 is 10 percent of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the hydrogen peroxide in the step 2 is 3 percent of the mass of the water-blooming cyanobacteria dry matter.
The stirring time for stirring uniformly in the step 2 is 0.5 h.
The adding amount of the polymeric aluminum ferric chloride medicament in the step 3 is 8 percent of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the quicklime in the step 3 is 3 percent of the mass of the water-blooming cyanobacteria dry matter.
And adding the polyaluminum ferric chloride medicament in the step 3, stirring for 0.5h, and adding quicklime.
Example 2
A pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria comprises the following steps:
step 1, diluting and stirring initial algae mud obtained after pre-dehydration of bloom-forming cyanobacteria to obtain algae-water mixed liquor with the water content of 95%;
step 2, sequentially adding ferrous sulfate powder and hydrogen peroxide into the algae-laden water mixed solution, and fully stirring to obtain a mixed solution A;
and 3, sequentially adding the polyaluminum ferric chloride medicament and the quick lime into the mixed solution A, and uniformly stirring to obtain the pre-conditioned water hualan algae solution.
The water content of the initial algae mud obtained by pre-dehydrating the bloom-forming cyanobacteria in the step 1 is 85-90%.
And (3) diluting the initial algae mud obtained after the pre-dehydration of the bloom-forming cyanobacteria in the step (1) to 95% algae-water mixed liquor by adding water.
The adding mass of the ferrous sulfate powder in the step 2 is 15 percent of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the hydrogen peroxide in the step 2 is 10 percent of the mass of the water-blooming cyanobacteria dry matter.
The stirring time for stirring uniformly in the step 2 is 0.5 h.
The adding amount of the polymeric aluminum ferric chloride medicament in the step 3 is 15 percent of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the quicklime in the step 3 is 10 percent of the mass of the water-blooming cyanobacteria dry matter.
And adding the polyaluminum ferric chloride medicament in the step 3, stirring for 0.5h, and adding quicklime.
Example 3
A pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria comprises the following steps:
step 1, diluting and stirring initial algae mud obtained after pre-dehydration of bloom-forming cyanobacteria to obtain algae-water mixed liquor with the water content of 95%;
step 2, sequentially adding ferrous sulfate powder and hydrogen peroxide into the algae-laden water mixed solution, and fully stirring to obtain a mixed solution A;
and 3, sequentially adding the polyaluminum ferric chloride medicament and the quick lime into the mixed solution A, and uniformly stirring to obtain the pre-conditioned water hualan algae solution.
The water content of the initial algae mud obtained by pre-dehydrating the bloom-forming cyanobacteria in the step 1 is 85-90%.
And (3) diluting the initial algae mud obtained after the pre-dehydration of the bloom-forming cyanobacteria in the step (1) to 95% algae-water mixed liquor by adding water.
The adding mass of the ferrous sulfate powder in the step 2 is 13 percent of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the hydrogen peroxide in the step 2 is 6 percent of the mass of the water-blooming cyanobacteria dry matter.
The stirring time for stirring uniformly in the step 2 is 0.5 h.
The adding amount of the polymeric aluminum ferric chloride medicament in the step 3 is 11 percent of the mass of the water-blooming cyanobacteria dry matter.
The adding amount of the quicklime in the step 3 is 7 percent of the mass of the water-blooming cyanobacteria dry matter.
And adding the polyaluminum ferric chloride medicament in the step 3, stirring for 0.5h, and adding quicklime.
Performance detection
Pumping the conditioned water-blooming cyanobacteria liquid into a plate-and-frame filter press through a feeding screw pump, and automatically controlling through the plate-and-frame filter press. The final mud-discharging effect is as follows:
the initial algae mud pre-dehydrated by the water bloom blue algae is directly pumped into a plate-and-frame filter press through a feeding screw pump without conditioning, and is automatically controlled through the plate-and-frame filter press.
In summary, the invention has the following advantages:
1. the invention solves the problem that the existing technology can not treat the water bloom blue algae mud with the water content of 85-90%, and the water bloom blue algae is pretreated by dilution and multiple reaction modes, thereby facilitating the subsequent plate-and-frame filter pressing and improving the filter pressing effect.
2. The invention utilizes the ferrous sulfate and the hydrogen peroxide to form hydroxyl free radicals, not only has the oxidation capability, but also has the addition reaction characteristic, and effectively releases the water among the blue algae cells.
It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (1)
1. A pretreatment method for plate-frame filter pressing of bloom-forming cyanobacteria is characterized by comprising the following steps:
step 1, diluting and stirring initial algae mud obtained after pre-dehydration of bloom-forming cyanobacteria to obtain algae-water mixed liquor with the water content of 95%;
step 2, sequentially adding ferrous sulfate powder and hydrogen peroxide into the algae-laden water mixed solution, and fully stirring to obtain a mixed solution A;
step 3, sequentially adding a polyaluminum ferric chloride medicament and quick lime into the mixed solution A, and uniformly stirring to obtain a pre-conditioned water hualan algae solution;
the water content of the initial algae mud obtained by pre-dehydrating the bloom-forming cyanobacteria in the step 1 is 85-90%; diluting the initial algae mud obtained by pre-dehydrating the bloom-forming cyanobacteria in the step 1 to 95% algae-water mixed solution in a water adding manner;
the adding mass of the ferrous sulfate powder in the step 2 is 10-15% of the mass of the water-blooming cyanobacteria dry matter; the addition amount of the hydrogen peroxide is 3-10% of the mass of the water-blooming cyanobacteria dry matter; stirring for 0.5 h;
the adding amount of the polymeric aluminum ferric chloride medicament in the step 3 is 8-15% of the mass of the water-blooming cyanobacteria dry matter; the addition amount of the quicklime is 3-10% of the mass of the water-blooming cyanobacteria dry matter; adding polyaluminum ferric chloride agent, stirring for 0.5h, and adding quicklime.
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Address after: 214000 Qinyuan Xincun 15-9, Wuxi City, Jiangsu Province Applicant after: Wuxi Water Group Co., Ltd. Address before: 214000 Qinyuan Xincun 15-9, Wuxi City, Jiangsu Province Applicant before: Wuxi Taihu Water Co., Ltd. |
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Inventor after: Shi Yu Inventor after: Zhu Yuyu Inventor after: Tao Ning Inventor after: Qian Chengbin Inventor after: Sun Wei Inventor after: Jiu Yi Inventor after: Zhou Juanjuan Inventor after: Zhang Wenjun Inventor before: Shi Yu Inventor before: Zhu Yuyu Inventor before: Tao Ning Inventor before: Qian Chengbin Inventor before: Sun Wei |
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Inventor after: Shi Yu Inventor after: Sun Wei Inventor after: Zhu Yuyu Inventor after: Tao Ning Inventor after: Qian Chengbin Inventor after: Miao Yi Inventor after: Zhou Juanjuan Inventor after: Zhang Wenjun Inventor before: Shi Yu Inventor before: Zhu Yuyu Inventor before: Tao Ning Inventor before: Qian Chengbin Inventor before: Sun Wei Inventor before: Miao Yi Inventor before: Zhou Juanjuan Inventor before: Zhang Wenjun |
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