双氧水协同凤眼莲去除富营养化水体中高浓度蓝藻的效果

Effect of hydrogen peroxide combined with Eichhornia crassipes on removal of high concentration cyanobacteria in eutrophic water

为了实现蓝藻治理与富营养化水体氮、磷等污染物高效削减的双重目标,以暴发蓝藻的城市富营养化河道水体为分析对象,通过模拟试验,研究H_(2)O_(2)与凤眼莲协同去除水体中高质量浓度蓝藻的效果。H_(2)O_(2)除藻质量浓度阈值探索试验结果显示,15 mg/L H_(2)O_(2)处理4 h后,蓝藻的光合活性下降了75%,24 h内其活性无明显恢复。H_(2)O_(2)与凤眼莲协同试验结果表明,在处理后的前72 h,单一H_(2)O_(2)处理的除藻效果最好,在处理后72 h至处理后96 h,H_(2)O_(2)+凤眼莲处理的除藻效果最好,单一凤眼莲处理在试验后96 h内无明显除藻效果。研究还发现,单一H_(2)O_(2)处理的水体NO_(2)^(-)-N、NH_(4)^(+)-N、PO_(4)^(3-)-P质量浓度较对照组显著升高,可能存在藻华再次暴发的风险。试验后96 h,H_(2)O_(2)+凤眼莲处理对藻生物量的去除率为74.58%,对总氮(TN)、总磷(TP)的去除率分别为54%、36%。此外,微生物群落分析结果表明,H_(2)O_(2)+凤眼莲处理对水体中蓝藻的去除效果较显著,微生物群落多样性较对照显著提高,由此可见,H_(2)O_(2)协同凤眼莲处理可有效控制蓝藻水华并改善水质。

To achieve the dual objectives of cyanobacteria treatment and efficient reduction of pollutants such as nitrogen and phosphorus in eutrophic water,the urban eutrophic river water with cyanobacteria outbreak was taken as the object,and the synergistic removal effect of H_(2)O_(2)and Eichhornia crassipes on high concentration cyanobacteria in water was studied through simulation experiment.The experimental results showed that the photosynthetic activity of cyanobacteria decreased by 75%after treatment with 15 mg/L H_(2)O_(2)for four hours,and there was no obvious recovery of its activity within 24 hours.The synergistic experiment of H_(2)O_(2)and E.crassipes showed that the algae removal effect of single H_(2)O_(2)treatment was the best in the first 72 hours,from 72 hours to 96 hours,the algae removal effect of H_(2)O_(2)+E.crassipes treatment was the best,and the single E.crassipes treatment had no obvious algae removal effect in 96 hours.It was found that the concentrations of NO_(2)^(-)-N,NH_(4)^(+)-N,PO_(4)^(3-)P in the water treated with single H_(2)O_(2)were significantly higher than those in the control group,and there may be a risk of algal blooms again.At 96 h after the experiment,the removal rate of algae biomass by H_(2)O_(2)+E.crassipes treatment was 74.58%,and the removal rates of total nitrogen(TN)and total phosphorus(TP)were 54%and 36%,respectively.In addition,the results of microbial community analysis showed that H_(2)O_(2)+E.crassipes had a significant removal effect on cyanobacteria in water,and the diversity of microbial community was significantly improved.Therefore,H_(2)O_(2)combined with E.crassipes can effectively control cyanobacteria bloom and improve water quality.