Preparation method of ecological security flocculating agent for effectively removing phosphorus and algae in eutrophic water body

An ecological safety and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., to achieve the effects of lattice structure optimization, complexation ability improvement, and surface structure optimization

Active Publication Date: 2015-07-15
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: aiming at the problems existing in the prior art, a method for preparing an ecologically safe flocculant for in-situ efficient phosphorus and algae removal in eutrophic water bodies is proposed, and the flocculant prepared by the method It eliminates the potential ecological safety hazards of the flocculant used in the chemical coagulation sedimentation method and the problem that it is not suitable for direct application of phosphorus removal in eutrophic water bodies such as lakes, rivers, ponds, etc., and can avoid the use of polyacrylamide additives, taking into account the flocculant The ecological safety and high efficiency of the use, and maintain the high efficiency of flocculation phosphorus removal, reducing the cost of phosphorus removal

Method used

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  • Preparation method of ecological security flocculating agent for effectively removing phosphorus and algae in eutrophic water body
  • Preparation method of ecological security flocculating agent for effectively removing phosphorus and algae in eutrophic water body
  • Preparation method of ecological security flocculating agent for effectively removing phosphorus and algae in eutrophic water body

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Effect test

Embodiment 1

[0030] The flocculant preparation method of the present embodiment comprises the following steps:

[0031] The first step, material preparation: Weigh 30 g of commercially available polyaluminum chloride powder and 60 g of yellow clay.

[0032] The second step, clay pretreatment: after the yellow clay is pulverized and sieved (60 mesh), the particle size is less than 0.425mm. After mixing 60g of yellow clay with 180ml of water, add a concentration of 50mM diluted 182ml of hydrochloric acid was used to adjust the basicity to 70% to obtain a ready-to-use clay suspension.

[0033] The third step, preparation of polyaluminum chloride solution: after mixing 30g of polyaluminum chloride powder with 100ml of water evenly, add a dilute sodium hydroxide solution with a concentration of 50mM to the mixture while stirring to adjust the basicity to 70% , to obtain polyaluminum chloride solution.

[0034] The fourth step, composite reaction: slowly pour the polyaluminum chloride solution...

Embodiment 2

[0042] The flocculant preparation method of the present embodiment comprises the following steps:

[0043] The first step, material preparation: Weigh 60 g of commercially available polyaluminum chloride powder and 30 g of yellow clay.

[0044] The second step, clay pretreatment: after the yellow clay is pulverized and sieved (40 mesh), the particle size is less than 0.425mm. After mixing 30g of yellow clay with 90ml of water evenly, add a concentration of 30mM diluted Adjust the basicity to 70% with hydrochloric acid to obtain the ready-to-use clay suspension.

[0045] The 3rd step, preparation polyaluminum chloride solution: after 60g polyaluminum chloride powder is mixed with 200ml water evenly, to its mixed solution dropwise while stirring, concentration is 740.6ml dilute hydrochloric acid of 750mM to adjust the base degree to 70%, A polyaluminum chloride solution is obtained.

[0046] The fourth step, composite reaction: slowly pour the polyaluminum chloride solution ad...

Embodiment 3

[0053] The flocculant preparation method of the present embodiment comprises the following steps:

[0054] The first step, material preparation: Weigh 45g of commercially available polyaluminum chloride powder and 45g of yellow clay.

[0055] The second step, clay pretreatment: after the yellow clay is pulverized and sieved (80 mesh), the particle size is less than 0.425mm. After mixing 45g of yellow clay with 130ml of water, add a concentration of 50mM diluted Adjust its basicity to 70% with 136.5 ml of hydrochloric acid to obtain the clay suspension for use.

[0056] The 3rd step, preparation polyaluminium chloride solution: after 45g polyaluminum chloride powder is mixed with 150ml water evenly, to its mixed solution dripping concentration is 834ml of dilute hydrochloric acid of 500mM while stirring to adjust its basicity to 70%, A polyaluminum chloride solution is obtained.

[0057] The fourth step, composite reaction: slowly pour the polyaluminum chloride solution adjus...

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Abstract

The invention relates to a preparation method of an ecological security flocculating agent for effectively removing phosphorus and algae in a eutrophic water body. The preparation method comprises the following steps of preparing materials, uniformly mixing original clay with water to obtain clay suspension, adjusting the basicity to 50-90% by dropping dilute acid into the clay suspension, uniformly mixing aluminium polychlorid powder with water to prepare aluminium polychlorid solution, adjusting the basicity to 50-90% by dropping dilute acid or dilute alkali into the aluminium polychlorid solution, pouring the aluminium polychlorid solution into the clay suspension, standing and curing at 50-80 DEG C to obtain curing solution, drying the curing solution at 50-80 DEG C, and crushing and sieving to obtain the flocculating agent. According to the invention, the removal rate of total phosphorus is 93% or more; the removal rate of CODCr is 53% or more; the removal rate of total nitrogen is also above 3%; the removal rate of water-blooming cyanobacteria is 96% or more; the removal rate of algal toxin MC-LR is 7% or more; and the risk in rapidly releasing algal toxin is not caused.

Description

technical field [0001] The invention relates to a preparation method of an ecologically safe flocculant applied to eutrophic water bodies for in-situ efficient phosphorus and algae removal, and belongs to the technical field of water treatment. Background technique [0002] As far as the applicant knows, since the 1980s in my country, due to the rapid economic development and the relative lag in environmental protection, many lakes and rivers have entered a state of eutrophication, even severe eutrophication, which is inferior to the "Environmental Quality Standards for Surface Water" "(GB3838-2002) Class V. Along with the eutrophication of water bodies, frequent outbreaks of cyanobacteria blooms cause a large number of fish and other aquatic organisms to die, and a large amount of algae toxins are released, resulting in damage to water body functions. In recent years, the restoration of eutrophic water bodies has become a challenging environmental problem all over the world...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/58
CPCC02F1/5236C02F1/58
Inventor 周庆韩士群邱敬云张燕
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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