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Water bloom blue algae dewatering method

A technology of blooming cyanobacteria and cyanobacteria, which is applied in the direction of centrifugal separation water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of difficult disposal, inconvenient transportation, and large amount of input, so as to improve the dehydration effect and dehydration High efficiency and fast dehydration effect

Inactive Publication Date: 2008-03-12
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is: the water content of salvaged cyanobacteria is very high, the transportation is inconvenient, the final disposal is extremely difficult, and the water content of the existing cyanobacteria dehydration method is still high after dehydration without flocculant, or Putting the flocculant directly on the water surface is a large amount and difficult to control, or the dehydration effect of the floating method is poor, and the water mainly depends on the subsequent drying treatment, which is costly and is not suitable for large-scale treatment after the outbreak of blue-green algae. Provide A new dehydration method for blooming cyanobacteria

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Subsequent dehydration method for bloom cyanobacteria used in fertilizer processing

[0021] Fish out about 10 tons of blooming cyanobacteria with a water content of 95% (the dry matter of the cyanobacteria is about 0.5 tons), and sieve through a 10-mesh vibrating sieve to remove impurities such as aquatic plants and plastics, and transfer the filtered algae liquid to a mixer while stirring Evenly spray the concentrated solution of ferric chloride, potassium permanganate and cetyltrimethylammonium bromide, the total consumption of ferric chloride, potassium permanganate and cetyltrimethylammonium bromide is respectively 5kg, 50g and 50g. After mixing, transfer to a disc centrifuge with a pump for centrifugation at a speed of 7000 rpm. The algae mud is discharged every 10 minutes to obtain a dehydrated algae mud with a water content of about 87%.

[0022] The algae mud obtained by centrifugation is transferred to a belt filter press, and the pressure of 1.0 MPa is used...

Embodiment 2

[0024] Subsequent dehydration method of bloom cyanobacteria for processing feed additives or extracting functional substances such as carotene, phycocyanin, etc.

[0025] Fish out about 10 tons of blooming cyanobacteria with a water content of 97% (the dry matter of the cyanobacteria is about 0.3 tons), sieve through a 20-mesh rotary sieve to remove impurities such as aquatic plants and plastics, and transfer the filtered algae liquid to a mixer while stirring Evenly spray the concentrated solution of cationic polyacrylamide, potassium permanganate and cetyltrimethylammonium bromide, the total amount of ferric chloride, potassium permanganate and cetyltrimethylammonium bromide respectively Available in 800g, 60g and 60g. After mixing, transfer to a disc centrifuge with a pump for centrifugation at a speed of 10,000 rpm. The algae mud is discharged every 6 minutes to obtain a dehydrated algae mud with a water content of about 86%.

[0026] The algae mud obtained by centrifuga...

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Abstract

The present invention relates to a method for dehydrating the bloom-forming cyanobacteria. In the method, the bloom-forming cyanobacteria is sifted out and after the large-particle impurities are eliminated, the flocculating agents and the accessory ingredients of the flocculating agents are added in the filtrate and the flocculating agents and the accessory ingredients of the flocculating agents are stirred to be uniform, and the centrifugal dehydration is put into practice so as to obtain the cyanobacteria mud, the liquid water content of which ranges from 86% to 890%. The cyanobacteria muds after being treated is further dehydrated by utilizing a filter press to implement the filter pressing so as to obtain the cyanobacteria cakes, the liquid water content of which ranges from 75% to 80%. Comparing the technical general performance index of the present invention with that of the technology of the same kind, the dehydration treatment can be applied to the cyanophytes salved in mass in the present invention; the algicides are selected as the dehydration synergism promoter in the present invention, thus being beneficial to the release of the intracellular water and greatly enhancing the dehydrating effect; aiming at different uses of cyanobacterias, the flocculating agents are reasonably selected and the two-step approach is adopted to carry out the dehydration in the present invention, thus assuring the quality of the subsequent products while lowering the treatment cost.

Description

Technical field: [0001] The invention relates to a method for dehydrating cyanobacteria in bloom, which is a preliminary pretreatment technology for resource utilization of cyanobacteria in bloom, and belongs to the field of agricultural environmental protection. technical background: [0002] Algae blooms in nutrient-rich water bodies are a global problem. In my country, due to the rapid economic development and population surge, a large number of production and living pollutants have entered the water body, inland rivers, lakes and offshore waters have been seriously polluted, and cyanobacteria blooms, green algae blooms and red algae blooms have occurred frequently. Toxic substances, odorous substances and organic substances released by a large number of dead algae have seriously deteriorated local water and air quality, and endangered fishery and drinking water safety. [0003] According to many years of research, the water blooms in lakes such as Dianchi Lake, Taihu Lak...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/38
Inventor 黄红英常志州叶小梅吴君伟
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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