摘要
为探究水生植物腐解对人工湿地持续净化效率的影响,通过56 d烧杯试验,考察了水西湿地浮叶植物(睡莲)、挺水植物(芦苇、梭鱼草)和沉水植物(狐尾藻)残体对湿地净化微污染水西河的影响。结果表明:空白对照组水质变化较小,试验组4种水生植物的快速腐解发生在3 d左右,9 d后缓慢趋于平稳;56 d pH由(7.86±0.01)降至(7.00±0.05),溶解氧(DO)降幅为(1.41±0.75) mg/L,且降幅次序为浮叶植物>挺水植物>沉水植物。当腐解时间为3 d时,水体高锰酸盐指数(CODMn)、总氮(TN)和总磷(TP)浓度分别增加了(8.31±2.87)、(2.12±1.41)和(0.67±0.24) mg/L,且睡莲>芦苇、梭鱼草>狐尾藻;同时,pH和DO分别下降了(0.88±0.23)和(3.84±1.85) mg/L;高生物量密度植物的腐解易加剧水质恶化(p<0.05),且恢复水质所需时间较长。相比第56 d收割,第3 d收割可使得水体CODMn、TN和TP消减量最高分别提升(4.93±0.63)、(1.53±1.49)和(0.69±0.04) mg/L。
In order to explore the effect of the aquatic plant decomposition on the continuous purification efficiency of the constructed wetland, the effects of floating leaf plants(water lily), emergent plants(reed, barracuda grass) and submerged plants(foxtail algae) on the purification of the micro polluted Shuixi River in Shuixi wetland were investigated through 56 day Jar tests.The results showed that the water quality of the blank control group changed little, and the rapid decomposition of four aquatic plants in the test group occurred in ~3 days and gradually stabilized after 9 days. During 56 days, the pH value decreased from(7.86±0.01)to(7.00 ± 0.05), and the decline of DO was(1.41 ± 0.75) mg/L, and the order of decline was floating leaf plants > emergent plants >submerged plants. When the decomposition time was 3 days, the concentrations of TN, TP and CODMn increased by(2.12 ± 1.41)mg/L,(0.67 ± 0.24) mg/L and(8.31 ± 2.87) mg/L respectively, and water lily > reed, barracuda > foxtail algae. In addition, pH and DO decreased by(0.88 ± 0.23) and(3.84 ± 1.85) mg/L respectively. The decomposition of plants with a high biomass density was easy to aggravate the deterioration of water quality(p < 0.05) with a long time to restore the water quality. Compared with harvest on the 56th day, the maximum reduction of CODMn, TN and TP could increase by(4.93 ± 0.63) mg/L,(1.53 ± 1.49) mg/L and(0.69 ±0.04) mg/L respectively with the condition of harvest on the 3rd day.
作者
马明海
罗毅
陈然
陶春军
徐圣友
钱丽萍
MA Minghai;LUO Yi;CHEN Ran;TAO Chunjun;XU Shengyou;QIAN Liping(School of Life and Environmental Science,Huangshan University,Huangshan 245041,China;College of Environment,Hohai University,Nanjing 210024,China;Geological Survey of Anhui Province,Hefei 230001,China)
出处
《环境保护科学》
CAS
2022年第6期116-120,共5页
Environmental Protection Science
基金
安徽省自然科学研究重点项目(KJ2020A0690,KJ2019ZD42)
黄山学院人才启动项目(2019xkjq007,2020xkjq010)。
关键词
湿地植物
腐解
微污染水西河
新安江
刈割
wetland plants
decomposition
micro polluted Shuixi River
Xinan River
cutting
