铁改性竹屑生物炭的添加对苦草(Vallisneria spiralis)水质净化及其生理特性的影响

Effect of adding iron-modified bamboo biochar on water purification and physiological characteristics of Vallisneria spiralis

利用苦草水质净化模拟系统,通过循环批次实验考查在系统基质中添加3%的不同浓度FeCl_(3)改性竹屑生物炭对系统水质净化效果和苦草生理生化特性的影响。结果表明,栽种苦草提高了系统净化NH_(4)^(+)-N、TN、TP、COD的效率。随着FeCl_(3)浓度的升高,系统净化NH_(4)^(+)-N的效果增强,TN的效果影响不大,而COD、TP的效果降低。添加3%的0.10 mol·L^(-1)和0.20 mol·L^(-1)FeCl_(3)改性竹屑生物炭抑制苦草生长及其光合作用,导致苦草体内过氧化物酶(POD)活性增强及丙二醛(MDA)含量升高,诱导了细胞脂质过氧化;添加3%的0.05 mol·L^(-1)FeCl_(3)改性竹屑生物炭,促进苦草根系生长,提升苦草根系活力。低浓度(0.05 mol·L^(-1))FeCl_(3)改性竹屑生物炭在强化水质净化,促进苦草生长恢复具有一定的应用潜力。

In this study,a simulation system of water purification planted with Vallisneria spiralis was used to investigate the effect of adding 3%ration of bamboo biochar modified with different concentrations FeCl_(3)to the system as substrate on the water purification efficiency,physiological and biochemical characteristics of Vallisneria spiralis.The results showed that planting Vallisneria spiralis improved the purification effect of NH_(4)^(+)-N,TN,TP and COD in the system.With the increase of FeCl_(3)concentration,NH_(4)^(+)-N removal effect by the system increased,slight TN removal effect occurred,while the removal effects of COD and TP decreased.The addition of 3%ratio of bamboo biochar modified with 0.10 mol·L^(−1),0.20 mol·L^(−1)FeCl_(3)could inhibit the growth and photosynthesis of Vallisneria spiralis,resulting in the increase of peroxidase(POD)activity and malondialdehyde(MDA)content in Vallisneria spiralis,and inducing cell lipid peroxidation.The addition of 3%biochar modified with 0.05 mol·L^(−1)FeCl_(3)could promote the roots growth of Vallisneria spiralis and enhance the root activity of Vallisneria spiralis.The addition of biochar modified with low concentration(0.05 mol·L^(−1))FeCl_(3)has a certain application potential in strengthening water purification and promoting the growth and recovery of Vallisneria spiralis.