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Technique for harnessing water bloom and bed mud secondary pollution using lake sediment

A sediment and sediment technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of destroying water quality, sediment deposition, not solving or reducing the degree of eutrophication of water bodies, etc.

Inactive Publication Date: 2004-11-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these clay algae removal technologies have their drawbacks: the added clay increases the accumulation of sediment and sediment at the bottom of the water body, causing negative effects of sediment deposition; foreign clay may have an impact on aquatic organisms; algae that settle to the bottom of the water Death, decay and decomposition consume a lot of oxygen, resulting in an anaerobic environment at the bottom of the water and destroying water quality; and the above methods do not solve or reduce the eutrophication of the water body, and algal blooms often break out again after a week or a few weeks

Method used

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  • Technique for harnessing water bloom and bed mud secondary pollution using lake sediment
  • Technique for harnessing water bloom and bed mud secondary pollution using lake sediment
  • Technique for harnessing water bloom and bed mud secondary pollution using lake sediment

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1 Modification of bottom sludge 1

[0021] The chitosan used in this embodiment 1 is the industrial grade chitosan produced by Qingdao Haisheng Bioengineering Co., Ltd., calcium peroxide (CaO 2 ) is a chemically pure reagent produced by China Pharmaceutical (Group) Shanghai Chemical Reagent Company. Weigh 100 mg of chitosan, add 10 ml of 1% HCl solution, and after the chitosan is completely dissolved, add distilled water to dilute to 100 ml to obtain a 1 mg / ml chitosan solution. Take 10 ml of chitosan solution, add 90 mg of clay (that is, modifier: clay is 1:9), ultrasonically treat for 1 min and mix, and add calcium peroxide powder in an amount of 5 mg / L before use.

Embodiment 2

[0022] Example 2 Modification of bottom sludge 2

[0023] The chitosan used in this Example 2 was industrial grade chitosan produced by Qingdao Haisheng Bioengineering Co., Ltd. Weigh 100 mg of chitosan, add 10 ml of 1% HCl solution, and after the chitosan is completely dissolved, add distilled water to dilute to 100 ml to obtain a 1 mg / ml chitosan solution. Take 10ml of chitosan solution, add 90mg of clay (namely modifier:clay is 1:9), ultrasonically treat for 1min and mix well, add calcium percarbonate powder at 10mg / L before use.

Embodiment 3

[0024] Example 3 Modification of bottom sludge 3

[0025] The carboxymethyl chitosan used in this example 3 is produced by Qingdao Haisheng Biological Engineering Co., Ltd., the sodium percarbonate is produced by Zhejiang Jinke Chemical Co., Ltd., and the zeolite is produced by Shenyang Jingang Wollastonite Mining Co., Ltd. Natural zeolite, identified as clinoptilolite. Weigh 100 mg of carboxymethyl chitosan and add 100 ml of distilled water to obtain a 1 mg / ml solution of carboxymethyl chitosan. Take 10ml of carboxymethyl chitosan solution, add 90mg of clay (i.e. modifier: clay is 1:9), ultrasonically treat for 1min and mix well, add sodium percarbonate and zeolite in an amount of 10mg / L before use powder.

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Abstract

The present invention provides one comprehensive technology of utilizing eutrophic and algalbloom polluted precipitant in in-situ algae killing, ventilation and phosphate fixing. By means of the said technology, bed mud or bankside clay is used in treating algalbloom in low cost. The said technology can eliminate algae effectively, increase dissolved oxygen concentration in water, reduce H2S and NH3-N produced, improve water quality, speed the degradation of organic in water, increase calcium in water, make bottom matter loose and ventilating, minimize and fix water body, bed mud and deposited phosphor in algae cell for no further utilization by living things. The present invention may be used in comprehensive treatment of red tide in sea, water bloom in fresh water, etc.

Description

technical field [0001] The invention relates to a comprehensive technology for controlling eutrophication of water bodies and in-situ algae removal, oxygenation and phosphorus fixation of sediments of freshwater blooms. Specifically, it is to use locally available sediments or bank clays, etc., after dephosphorization, nitrogen removal and organic matter removal, and after modification with safe and effective sediment / clay modifiers, it is used for coagulation and sedimentation to remove water bodies. At the same time, it can improve the anaerobic environment of the bottom and mineralize the excess phosphorus in the bottom of the water, so as to achieve the purpose of comprehensive management of algal blooms. Background technique [0002] The eutrophication of natural seawater, lakes and rivers can lead to the outbreak of harmful algae (commonly known as red tides in seawater and blooms in freshwater), which has become a global environmental pollution problem. It not only s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
Inventor 潘纲邹华陈灏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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