Treatment effect of constructed wetlands on organic matter in wastewater from pig farm

Abstract

Abstract: Using plant species Vetiveria zizanioides and Cyperus alternifolius respectively,two constructed wetlands (CWS) with size of 1.0m×0.5m×0.8m were established.The purifying function and its change pattern with season,influent concentration and hydraulic retention time (HRT) of the constructed wetlands on the organic matters in wastewater from a pig farm were studied throughout four seasons in the year.The results showed that the two CWShad very stable effects on the removal of CODand BOD,while the organic matters in wastewater changed.The removal rate of CODand BODwas 70% and 80% respectively by HRT 1～2 d in spring.The removal rate of CODreached 90% with the influent of COD 1000～1400mg·L^-1 in summer.The removal rate of CODand BODwas 50～60% and 50% respectively by HRT 1～2 d in autumn.The removal rate of CODreached 70% with the influent of COD 1003mg·L^-1 in winter.There was no significant difference between two CWSin the removal of COD,BODand SS.The rule of contaminants decreased with the HRTin CWSfollowed exponential function:Y_t=Y₀exp(-kt).The relation between the concentration of contaminants in influent (x) and outflow (y) at the same HRTfollowed linear relation:y=a+bx.

CLC Number:

X703

LIAO Xindi, LUO Shiming . Treatment effect of constructed wetlands on organic matter in wastewater from pig farm[J]. Chinese Journal of Applied Ecology, 2002, (1): 113-117.

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