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Method for processing arsenic-containing wastewater by pteris vittata artificial wet land

A technology of constructed wetland and constructed wetland system, which is applied in the field of using the hyperaccumulating plant centipede grass to design a constructed wetland system to treat arsenic-containing wastewater, can solve the problems of high cost and complicated operation.

Inactive Publication Date: 2008-09-03
NANCHANG UNIV
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Problems solved by technology

[0002] At present, several commonly used methods for treating arsenic-containing wastewater at home and abroad mainly include precipitation, flocculation, filtration, adsorption, oxidation, membrane separation, and biological methods. Although these methods have certain efficiency for treating large-flow, low-concentration arsenic-containing wastewater, they are costly and complicated to operate.

Method used

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Embodiment Construction

[0005] The subsurface wetland system is constructed by using the hyperaccumulative plant Centipede grass to treat arsenic-containing wastewater, and pebbles are used as the filler of the subsurface wetland system, and a certain thickness of soil is covered on the substrate to continuously extract arsenic in the water until the arsenic content in the water is reached. Meet the corresponding national environmental standards.

[0006] During the experiment, the centipede grass constructed wetland system was used to study the effect of As-containing wastewater treatment. Two kinds of substrates, ceramsite and cobblestone, were selected to develop a centipede grass-based constructed wetland system suitable for the treatment of As-containing wastewater. . The experimental results show that: when the concentration of arsenic in the influent is 0.25-1 mg / L, the removal rate of As in the solution by this system can reach 64.79%-80.32%. At the same time, the system for COD, NH 4 + -N...

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Abstract

The invention discloses a method for processing wastewater containing arsenic by using the ciliate desert grass artificial wetland. Super concentration plant ciliate desert grass which is planted in a drowned flow wetland system is utilized to process wastewater containing arsenic, cobblestones are used as the loading material of the drowned flow wetland system, soil with a certain thickness is covered on the groundmass of the drowned flow wetland system, and the arsenic in water body is continuously extracted till the content of arsenic in the water body reach the corresponding state environmental standard. With the advantages of high efficiency, low investment, low running, low maintenance technology, easy popularization and application, etc., the method has no secondary pollution, and meanwhile the ecologic system can not be damaged during recondition process, the method also can facilitate the soil or the water degradation and the falling of the productivity caused by the arsenic pollution of the soil and the water, and recover and improve the diversity of the soil or the water life-forms.

Description

Technical field [0001] The invention relates to a method for controlling arsenic pollution in water bodies, in particular to a method for designing an artificial wetland system to treat arsenic-containing wastewater by utilizing the super-enrichment plant centipede grass. Background technique [0002] At present, several commonly used methods for treating arsenic-containing wastewater at home and abroad mainly include precipitation, flocculation, filtration, adsorption, oxidation, membrane separation, and biological methods. Although these methods have certain efficiency for treating large-flow, low-concentration arsenic-containing wastewater, they are costly and complicated to operate. Contents of the invention [0003] In order to overcome the deficiencies of the currently commonly used methods for treating arsenic-containing wastewater, the present invention provides a method for treating arsenic-containing wastewater with a centipede grass artificial wetland, which has...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F3/32
CPCY02W10/10
Inventor 董瑞斌孙桂琴查红平
Owner NANCHANG UNIV
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