Ferrous sulfide microparticle reinforced subsurface flow constructed wetland and application thereof

By introducing ferrous sulfide microparticles into a subsurface flow constructed wetland and employing a reverse circulation injection method, the problems of weak heavy metal adsorption capacity and poor nitrate nitrogen removal effect are solved, achieving simultaneous enhanced removal of heavy metals and nitrate nitrogen, which is suitable for treating industrial and mining wastewater.

CN117228847BActive Publication Date: 2025-12-12SHANDONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202311300180.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-09
Publication Date
2025-12-12
Estimated Expiration
2043-10-09

AI Technical Summary

Technical Problem

Existing subsurface flow constructed wetlands have weak adsorption capacity for heavy metals, low microbial activity, and poor nitrate nitrogen removal effect, making it difficult to meet wastewater treatment needs.

Method used

Ferrous sulfide microparticles are introduced into the subsurface flow constructed wetland using a reverse circulation injection method. By matching the particle size of the packing material with that of the ferrous sulfide microparticles, the microbial sulfur autotrophic denitrification capacity is enhanced, achieving simultaneous removal of heavy metals and nitrate nitrogen.

Benefits of technology

It effectively enhances the removal capacity of subsurface flow constructed wetlands for heavy metals and nitrate nitrogen, and is suitable for treating industrial wastewater, mining wastewater and sewage treatment plant effluent, and controlling ecological and environmental pollution.

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Abstract

The application belongs to the field of ecological water treatment, and relates to a ferrous sulfide particle reinforced subsurface flow constructed wetland and application thereof. A ferrous sulfide particle suspension is added to the subsurface flow constructed wetland by using a reverse circulation injection method; the reverse circulation injection method comprises the following steps: a. injection from the water outlet of the subsurface flow constructed wetland; b. collection and discharge of the effluent from the water inlet of the subsurface flow constructed wetland, and re-injection of the effluent into the water outlet of the subsurface flow constructed wetland; wherein the b process is at least circulated once; the ratio of the particle size of the filler in the subsurface flow constructed wetland to the particle size of the ferrous sulfide particles is 1-10:1-100, cm:nm. The application can effectively introduce the ferrous sulfide particles into the subsurface flow constructed wetland, thereby effectively reinforcing the simultaneous reduction of heavy metals and nitrate nitrogen in the subsurface flow constructed wetland, so that the application can be used for treating industrial wastewater, mining wastewater, tail water of a sewage treatment plant and the like, and controlling the ecological environment health hazards caused by combined wastewater pollution of heavy metals and nitrate nitrogen.
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