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Preparation method for composite flocculant and method of curing alga bloom

A production process and flocculant technology, which is applied in the field of composite flocculant production process and algal bloom control, can solve problems such as unresolved algal bloom outbreaks, hard-to-emergency algal bloom control, and inconspicuous phosphorus removal effects, and achieve Eliminate secondary pollution, reduce COD, and reduce total nitrogen

Inactive Publication Date: 2007-10-17
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, biological methods, especially ecological restoration methods, are important methods for the prevention and control of algal blooms in small-scale and fixed areas. However, such methods often require huge artificial engineering in advance to create and control the aquatic plants required to inhibit algal blooms ( For example, it is difficult for submerged plants to survive in the water bottom with low transparency or lack of suitable sediment) or the living conditions of animals, so the effect is slow and the cost is high, so it is difficult to be generally applicable to the treatment of large-scale and sudden algal blooms
[0006] Although the above methods can relieve algae blooms to a certain extent, they have a common shortcoming - the effect of phosphorus removal is not obvious, and cannot solve the key problem of algal bloom outbreaks.

Method used

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Embodiment Construction

[0024] The production process method of composite flocculant comprises the following steps:

[0025] 1. Stir and mix the fly ash: ultrapure magnetite powder: concentrated hydrochloric acid in the ratio of 2g: 1g: 1ml for 5 minutes. Concentrated hydrochloric acid is 15-30% concentrated hydrochloric acid.

[0026] 2. Dry the reacted substance in 1 at 60°C-120°C and crush it into 50-200 mesh powder.

[0027] 3. Mix the powder obtained in 2 with polyaluminum ferric chloride (100 mesh) at a mass ratio of 1:1 to obtain the composite magnetic flocculant of the present invention.

[0028] The method for using the flocculant to control algal blooms comprises the following steps:

[0029] (1) Mix the flocculant with water at a ratio of 1g: 1-4mL to form a suspension.

[0030] (2), add the suspension prepared in (1) to the algae water according to the dosage ratio of 50-150mg / L (dry weight of flocculant / volume of algae water), stir at normal speed for 20 seconds and then let it stand ...

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Abstract

The invention provides a rapid and cheap method for producing compound magnetic flocculating agent and a method for fathering alga. The compound magnetic flocculating agent is composed of the reaction products of fly ash, hyperpure magnetite powder and concentrated hydrochloric acid and polymer chloridized aluminum and iron, which is capable of effectively absorb flocculating alga. The produced flocculating body is big and compact and precipitates rapidly. The alga flocculating body can be removed out of the water quickly via the foreign field, which can also apparently remove N and P from the water and solves the hazards from alga completely. The invention has extension and application foreground in the field of sea red current and lake eutrophication etc.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a production process method of a composite flocculant and a method for controlling algal blooms. Background technique [0002] In recent years, the occurrence and development of seawater blooms in my country's rivers and lakes has attracted widespread attention from all walks of life. The large-scale outbreak of water blooms has seriously damaged the balance and stability of aquatic ecosystems, not only affecting the water body landscape, but also affecting the aquaculture industry. development, and algae toxicity has constituted a threat to the human living environment. Only the economic losses caused by red tides to the coast amount to billions of yuan every year, so the outbreak of algae has become a disaster. The main nutrient elements that cause algal bloom outbreaks are nitrogen and phosphorus in water, especially phosphorus plays a key role. Currently more popular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/48
Inventor 蔡冬清丁克俭柳丹季程晨王相勤余增亮吴跃进
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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