八种湿地植物对净化生活污水的影响

Effects of Eight Wetland Plants on Purification of Domestic Sewage

试验探究了荷花、燕子花、西伯利亚鸢尾花、再力花、水菖蒲、黄菖蒲、菰和梭鱼草8种湿地植物在秋季对生活污水中TN、NH_(3)-N、NO_(3)-N、BOD_(5)、COD_(Cr)和TP的去除效果,并采用模糊数学中隶属函数法对水质净化效果进行综合评估。结果表明:秋季气温低,植物吸收作用、细菌硝化及反硝化作用弱,湿地植物对NH_(3)-N、NO_(3)-N和TN的去除效果均不理想;湿地植物对COD_(Cr)的去除效果较好但差异不明显,均达到70%以上,其中再力花、水菖蒲和黄菖蒲去除效果最好,三者对COD_(Cr)的去除率均为79.3%;湿地植物对BOD_(5)的去除效果较好且大致相同,均在70%左右,其中西伯利亚鸢尾花去除效果最好,对BOD_(5)的去除率达74.1%;湿地植物对TP的去除效果最好,均达80%以上,其中西伯利亚鸢尾花对TP的去除率高达92.4%。8种湿地植物对生活污水综合净化能力为荷花>菰>水菖蒲>梭鱼草>再力花>燕子花>西伯利亚鸢尾花>黄菖蒲。

the experiment explore the removal effects on TN,NH_(3)-N,NO_(3)-N,BOD_(5),COD_(Cr) and TP in the domestic sewage in the autumn by eight wetland plants of Nelumbo nucifera,Iris laevigata,Iris sibirica,Thalia dealbata,Rhizoma calamus,Iris pseudacorus,Zizania aquatica and Pontederia cordata.The method of membership function in fuzzy mathematics was used to evaluate the effects of water purification comprehensively.The results showed that due to the low temperature in the autumn,plant absorption,bacterial nitrification and denitrification were weak,and the removal effect of wetland plants on NH_(3)-N,NO_(3)-N and TN were not ideal.The removal effect on COD_(Cr) by wetland plants was good and the difference was not obvious,and all of them reached more than 70%.Thalia dealbata,Rhizoma calamus and Iris pseudacorus showed the best removal effects.The removal rates of COD_(Cr) by the three were all 79.3%.The removal effects on BOD_(5)by wetland plants were good and about the same,all around 70%,among which Iris sibirica showed the best removal effect,and the removal rate of BOD,was 74.1%.Wetland plants had the best removal effects on TP,all of which were above 80%.The removal rate of TP by Iris sibirica was as high as 92.4%.The comprehensive purification capacity of 8 wetland plants for domestic sewage was Nelumbo nucifera>Zizania aquatic>Rhizoma calamus>Pontederia cordata>Thalia dealbata>Iris laevigata>lris sibirica>Iris pseudacorus.