污水浓度对水培净化系统净化效果的影响

Influence of Wastewater Concentration on Nitrogen and Phosphorus Purifying Effect by Plant-Hydroponic Wastewater Purifying System

在植物水培污水净化系统中对污水浓度与氮磷净化效果间的关系进行研究,蕹菜作为水培植物材料,对设置5%、10%、20%不同浓度的化粪池出口污水,分别于第0、2、4、6、8、11 d测定TN、NH4+-N、过滤后总氮(fTN)、总磷(TP)、PO43-P、过滤后总磷(fTP)、CODCr、过滤后COD(fCODCr)。结果表明,TN、TP的去除率随污水浓度升高而升高,水培液中TN、TP浓度随污水浓度升高而降低。适当提高污水浓度有利于提高污水中TN、TP的去除效率。尽管蕹菜对污水中化学需氧量(COD)的去除没有影响,适当提高污水浓度也有利于提高COD去除率。污水浓度对铵态氮、磷酸根的去除影响不明显。

In the study on the relation of wastewater concentration and nitrogen and phosphorus purifying effects of plant-hydroponic wastewater system with Ipomoea aquatica as hydroponic plant, 3 concentrations （5 %, 10 %,20 % ） of cesspool wastewater were set up and the TN, NH4^＋ -N, fTN, 19043 p, fTP, CODCr and fCODCr were determined at 0, 2,4,6,8 and 11 day resp. The results showed that the removal rate of TN and TP increase with the increase of wastewater concentration. The concentration of TN and TP in hydroponic solution decreased with the increase of wastewater concentration. Increasing suitably the wastewater concentration could favor to improve TN and TP removal effects. Ipomoea aquatica had no effect on COD removal in water, but increasing suitably the wastewater concentration also favored to improve COD removal rate. The wastewater concentration hadn＇ t obvious effect on NH4^＋ -N and PO4^3-P removal.