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| Purification performance of combined constructed wetlands on livestock wastewater with low concentration of pollutants |
| Received:January 20, 2017 |
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| KeyWord:combined constructed wetland;livestock wastewater;removal rate;removal efficiency |
| Author Name | Affiliation | E-mail | | LIU Chang-e | Shanghai Academy of Agricultural Sciences, Shanghai 201403, China | | | ZHOU Sheng | Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-carbon Agriculture(SERCLA, Shanghai 201415, China | zhous@263.net | | SUN HUI-feng | Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-carbon Agriculture(SERCLA, Shanghai 201415, China | | | ZHANG Ji-ning | Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-carbon Agriculture(SERCLA, Shanghai 201415, China | | | CHEN Gui-fa | Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Centre of Low-carbon Agriculture(SERCLA, Shanghai 201415, China | |
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| Abstract: |
| In order to evaluate the removal rate and efficiency of livestock wastewater with low concentration of pollutants in constructed wetlands,four-stage combined constructed wetlands were used to purify piggery wastewater with low concentration of pollutants under intermittent influent.The variations of TN,TP,NH4+-N,and CODCr in different stages of the wetlands were monitored during spring,summer,autumn,and winter.The annual average concentrations of TN,TP,NH4+-N,and CODCr in the influent were 41.6,8.4,21.4,and 253.9 mg·L-1,respectively,and the removal efficiencies of these pollutants were 94.66%,79.36%,91.04%,and 32.32%,respectively.In addition,the first stage of the wetlands (reed-gravel vertical seepage flow) had higher rates for removing TN,TP,and CODCr,which were 2.9,0.6,and 7.5 g·m-2·d-1,respectively.The second stage of the wetlands (reed-zeolite vertical seepage flow) showed a high removal rate for NH4+-N,which was 1.8 g·m-2·d-1.However,the removal rates of pollutants in the third stage (reed-gravel horizontal undercurrent) and the fourth stage (rice-soil surface flow) of the wetlands were lower.The removal rates of TN,TP,and NH4+-N were all less than 0.4g·m-2·d-1,whereas that of CODCr was less than 2.3 g·m-2·d-1.Season and temperature had little influence on the removal rates of most of the studied pollutants. |
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