炉渣等4种基质对富营养化水体中NP的降解研究

采用塑料箱为容器对炉渣、碎石、碎砖头和碎陶片等4种基质分别在2、4、6 d换水周期下,对富营养化水体中N、P的去除效果进行了研究。结果表明:炉渣对TN具有一定的去除效果,其次为碎石,碎砖头和碎陶片则没有表现出去除效果,在水力停留时间(Hydrau lic Residence Tim e,HRT)为6 d时,4种基质对TN的平均去除率为:炉渣(24.7%)>碎石(14.0%)>碎砖头(-0.7%)>碎陶片(-13.6%),空白为6.4%;4种基质对NH4 -N都具有较好的去除效果,对NO3--N均无去除效果;碎石和炉渣对TP具有一定的去除效果(HRT为6 d时,碎石多次平均去除率为38.8%;炉渣为25.8%),碎砖头和碎陶片则在本试验中也没有对TP表现出去除效果;PO43--P情况与TP类似;较长换水周期时基质的去除效果要好于较短换水周期时的去除效果,为了保证基质对水体具有净化作用,4 d或更长的换水周期是比较可取的。

Nitrogen and Phosphorus Removal Performance from Eutrophic Water Body by Four Substrates

The removal performance of slag,gravels,broken bricks and broken potteries on nitrogen(N) and phosphorus(P) of natural eutrophic water body were investigated with PVC receptacles under 2,4 and 6 days of hydraulic residence time(HRT) respectively.The results showed that the slag had the good removal effect on N in the water,and the gravels were next.The broken bricks and broken potteries have little effect.When HRT was 6 days,the average removing ratio of four substrates were as following: slag(24.7%)>gravels(14.0%)>broken bricks(-0.7%)>broken potteries(-13.6%),with the control being 6.4%.All substrates had good removal effects on NH~ _4-N in the water,but little effects on NO~-_3-N.The slag and gravels had good removal effects on TP in the water,the average removing ratio being 38.8% and 25.8% respectively when HRT was 6 days,but the broken bricks and potteries had little effect on the removal of TP and PO~(3-)_4-P.Totally,The removal effects of slag and gravels on eutrophic water body were better than those of broken bricks and potteries.The better removal effects would be achieved under longer HRT in the experiment,and it was necessary for HRT with 4 days or more to achieve better removal effect of the substrate.