Algae-laden water separation process for scale and engineered treatment of high concentration algae slurry

A technology of algal water separation and high concentration, which is applied in flotation water/sewage treatment, flocculation/sedimentation water/sewage treatment, dehydration/drying/thickened sludge treatment, etc. Without mechanized salvage of cyanobacteria, it is impossible to form large-scale, engineering, and solve problems such as salvaging cyanobacteria, so as to prevent and control eutrophication of water bodies, improve the quality of water body environment, and facilitate ecological restoration.

Inactive Publication Date: 2010-07-14
WUXI DELINHAI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanically salvaged cyanobacteria pulp generally has a solid content of 0.5-1.5%, and the appearance is thick and sticky liquid. It is difficult to achieve solid-liquid separation and dehydration and volume reduction by general filtration or flocculation separation, and the disposal efficiency is low.
At present, most of the mechanically salvaged blue-green algae are disposed of near the shore, which not only takes up a lot of land, but also pollutes the surrounding environment and groundwater of the stacking site after the blue-green algae dies and decays.
Existing devices and technologies for controlling cyanobacteria, such as the air floatation cyanobacteria treatment ship technology, can treat low-concentration cyanobacteria, and are only suitable for local waters where the degree of enrichment of cyanobacteria blooms is not high, and cannot form large-scale, engineering, treatment and salvage of cyanobacteria , can not meet the needs of dealing with a large number of mechanized salvage of blue-green algae

Method used

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  • Algae-laden water separation process for scale and engineered treatment of high concentration algae slurry
  • Algae-laden water separation process for scale and engineered treatment of high concentration algae slurry
  • Algae-laden water separation process for scale and engineered treatment of high concentration algae slurry

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Example 1, Wuxi Yangwan Algal Water Separation Station:

[0030] In May 2009, an algae water separation station was built in Yangwan near the shore of Shibawan cyanobacteria gathering waters in Wuxi City, Jiangsu Province. The algae-water separation station is designed to process cyanobacteria: 10,000 tons / day, (solid content of algal pulp is 0.5-1.5%), algae removal rate is over 95%; algae pulp pool 7m×8m×3.5m (effective volume 150m 3 ); air flotation pool 4.8m×24.8m×2.8m, 2 sets; pipe mixer DN125×1200mm, 2 sets; pressure dissolved air tank working pressure 2.8kgf / cm 2 ; The gas-solid ratio is 0.02, and the algae residue pool is 4m×6m×3.5m (effective volume 60m 3 ); Horizontal spiral decanter centrifuge, design flow rate 15m 3 / h, 2 sets; the processing effect is as follows:

[0031]Table 1: Pollutant removal effect table

[0032]

[0033] According to the analysis of the above influent and effluent water quality testing results, the actual cyanobacteria removal...

example 2

[0034] Example 2, Wuxi Lvjiang Estuary Algal Water Separation Station:

[0035] In May 2009, an algae-water separation station was built in Lujiangkou, near the shore of the Lujiangkou cyanobacteria gathering waters in Wuxi City, Jiangsu Province. The algae-water separation station is designed to process cyanobacteria: 10,000 tons / day, (solid content of algal pulp is 0.5-1.5%), algae removal rate is over 95%; algae pulp pool 7m×8m×3.5m (effective volume 150m 3 ); air flotation pool 4.8m×24.8m×2.8m; pipeline mixer DN125×1200mm; working pressure of pressure dissolved air tank 2.8kgf / cm 2 ; The gas-solid ratio is 0.015, and the algae residue pool is 4m×6m×3.5m (effective volume 60m 3 ); Horizontal spiral decanter centrifuge, design flow rate 15m 3 / h; the processing effect is as follows:

[0036] Table 2: Pollutant removal effect table

[0037]

example 3

[0038] Example 3, Wuxi Xin'an algal water separation station:

[0039] In May 2009, an algae-water separation station was built in Xin'an near the shore of the cyanobacteria-gathering waters of Xidong Water Plant, Wuxi City, Jiangsu Province. The algae water separation station is designed to process cyanobacteria: 5000 tons / day, (solid content of algae slurry is 0.5-1.5%), algae removal rate is over 95%; algae slurry pool 7m×8m×3.5m (effective volume 150m 3 ); air flotation pool 4.8m×24.8m×2.8m; pipeline mixer DN125×1200mm; working pressure of pressure dissolved air tank 2.8kgf / cm 2 ; The gas-solid ratio is 0.012, and the algae residue pool is 4m×6m×3.5m (effective volume 60m 3 ); Horizontal spiral decanter centrifuge, design flow rate 15m 3 / h; the processing effect is as follows:

[0040] Table 3: Pollutant removal effect table

[0041]

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PUM

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Abstract

The invention relates to an algae-laden water separation process for scale and engineered treatment of a high concentration algae slurry, which comprises the step (1) of algae-laden water separation process and the step (2) of dewatering process, wherein in the step (1) of algae-laden water separation process, the algae slurry requiring to be processed is pumped in an algae slurry pool and then is pumped into a pipeline coagulation device, then the coagulation reaction is carried out on the algae slurry and a coagulant, and the obtained product is input into a secondary air floatation separation pool to carry out the algae-laden water separation; and in the step (2) of dewatering process, algae scums generated in the step (1) is scraped by a slag scraper into a scum tank and then flows into an algae slag pool, the algae slags are pumped into a high-speed shearing device by the pipeline, and then the product enters a horizontal screw sedimentation centrifuge to carry out dewatering. The invention has the advantages that adoption of the algae-laden water separation process can establish an algae-laden water separation station, remove more than 95 percent of algae in the high concentration algae slurry, take out nitrogen and phosphorus in the water to achieve the aim of purifying the water, solve the embarrassing situation that the blue-green algae cannot be treated after being salved, and form the scale and engineering treatment of the salved blue-green algae; the effluent water is clean and clear; and the algae-laden water separation process can effectively prevent and treat the water eutrophication and is very beneficial for ecological restoration.

Description

technical field [0001] The invention relates to a large-scale and engineered algal water separation process for treating high-concentration algae slurry. Background technique [0002] Studies have shown that eutrophication of water bodies is an important sign of lake and reservoir pollution, and the production of cyanobacteria "water blooms" is an important sign of eutrophication of lakes and reservoirs. In my country, the degree of eutrophication of lakes and reservoirs is becoming more and more serious. "Water blooms" appear frequently, spread year by year, and last for a long time, seriously restricting the sustainable development of society and economy around the waters. [0003] Through years of experience in cyanobacteria control combined with theoretical research and analysis, it has been recognized that mechanical salvage is the only effective method of cyanobacteria control measures that does not have a major impact on lake ecology at this stage. In recent years, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/24C02F11/12
Inventor 胡明明孙阳石军孙小鹏
Owner WUXI DELINHAI ENVIRONMENTAL PROTECTION TECH CO LTD
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