Effects of constructed wetlands on treating with nitrogen and phosphorus in wastewater from hoggery

Abstract

Abstract: Using plant species Vetiveria zizanioides (VCWS) and Cyperus alternifolius (CCWS) respectively,two constructed wetlands (CWS) with size of 1.0 m?0.5 m?0.8 m were established. The purifying function and its change pattern among different seasons,influent concentration and hydraulic retention time (HRT) of CWSon nitrogen and phosphorus in wastewater from a hoggery was studied throughout four seasons in the year. The results showed that the effects of HRTand wastewater concentration on the removal rate of NH₃-Nand S-PO₄^3- were obvious in both VCWSand CCWS. High removal rates of NH₃-Nand S-PO₄^3- were obtained in CCWSand VCWSin spring. Significant removal of TNin wastewater existed in CCWS and VCWS in autumn,while signi-ficant removal of TP in wastewater existed only in VCWS. The removal of TP or S-PO₄^3- against the HRT in CWS followed exponential function. The rates of Premoval in winter and summer changed with the influent concentrations. Under the same HRT,the change of S-PO₄^3- concentrations in outflow against the influent concentration followed a linear relationship.

CLC Number:

X703

LIAO Xindi, LUO Shiming . Effects of constructed wetlands on treating with nitrogen and phosphorus in wastewater from hoggery[J]. Chinese Journal of Applied Ecology, 2002, (6): 719-722.

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