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2012•Unpublished venueRequires access

Effect of Substrates in Constructed Wetland on the Purification of Nitrogen and Phosphorus

HU Meng-jiao

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Abstract

Soil,gravel and slag were selected as wetland substrates in the horizontal subsurface flow constructed wetland,and purified simulated wastewater containing ammonia nitrogen(NH+4-N),nitrate nitrogen(NO-3-N) and phosphate phosphorus(PO-4-P) as the main component of nitrogen with different retention time.And the effect of substrates in constructed wetland on the variety of pH,the removal efficiency of NO-3-N and NH+4-N were investigated.Results demonstrated that the removal efficiencies of nitrogen and phosphorus in soil-slag constructed wetland were best than these of other constructed wetlands when the hydraulic retention time was 10 days.The removal rates of NH+4-N in each constructed wetland was higher than that of NO-3-N.The purification efficiency of nitrogen in top layer was higher than bottom layer.The break-point of pH curve indicated the termination of NH+4-N oxidation reaction in constructed wetland.

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Soil,gravel and slag were selected as wetland substrates in the horizontal subsurface flow constructed wetland,and purified simulated wastewater containing ammonia nitrogen(NH+4-N),nitrate nitrogen(NO-3-N) and phosphate phosphorus(PO-4-P) as the main component of nitrogen with different retention time.And the effect of substrates in constructed wetland on the variety of pH,the removal efficiency of NO-3-N and NH+4-N were investigated.Results demonstrated that the removal efficiencies of nitrogen and phosphorus in soil-slag constructed wetland were best than these of other constructed wetlands when the hydraulic retention time was 10 days.The removal rates of NH+4-N in each constructed wetland was higher than that of NO-3-N.The purification efficiency of nitrogen in top layer was higher than bottom layer.The break-point of pH curve indicated the termination of NH+4-N oxidation reaction in constructed wetland.

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Available abstract

Soil,gravel and slag were selected as wetland substrates in the horizontal subsurface flow constructed wetland,and purified simulated wastewater containing ammonia nitrogen(NH+4-N),nitrate nitrogen(NO-3-N) and phosphate phosphorus(PO-4-P) as the main component of nitrogen with different retention time.And the effect of substrates in constructed wetland on the variety of pH,the removal efficiency of NO-3-N and NH+4-N were investigated.Results demonstrated that the removal efficiencies of nitrogen and phosphorus in soil-slag constructed wetland were best than these of other constructed wetlands when the hydraulic retention time was 10 days.The removal rates of NH+4-N in each constructed wetland was higher than that of NO-3-N.The purification efficiency of nitrogen in top layer was higher than bottom layer.The break-point of pH curve indicated the termination of NH+4-N oxidation reaction in constructed wetland.

Key concepts: Phosphorus, Nitrogen, Wetland, Constructed wetland, Phosphate, Wastewater, Environmental chemistry, Hydraulic retention time

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Effect of Substrates in Constructed Wetland on the Purification of Nitrogen and Phosphorus — Research Paper | ScholarLens