过氧化氢处理河流着生刚毛藻的效果研究

以深圳市某河流为研究对象,分析了投加H2O2对刚毛藻生物量的控制效果及其对水体p H、溶解氧、氨氮和总磷的影响。结果表明:H2O2≥1.25 mol/L时能有效抑制刚毛藻生长,使藻类光合活性在10 min内从5.8降低到0,叶绿素浓度在30 min内从5.8 mg/L降低至0.2 mg/L。现场试验投加H2O2处理河流水体中刚毛藻14 d内,藻类生物量、光合活性和叶绿素浓度降幅均高于90%。加药1 h后,河流p H值由原来的9.21~9.74迅速降低至8.23~8.80,14 d内保持在9以下。河流溶解氧、氨氮、总磷和H2O2残留浓度在除藻过程中存在变化,但是1 d后会迅速恢复至加药前水平。投加H2O2是一种有效、无污染的应急去除河流着生刚毛藻的方法。

Treatment of periphytic Cladophora oligoclona in river by hydrogen peroxide

This paper investigated the removal effects on the periphytic algae Cladophora oligoclona in a river, Shenzhen City, by adding hydrogen peroxide, and its influence on pH, dissolved oxygen, ammonia nitrogen and total phosphorus. The results exhibited that the growth of C. oligoclona was effectively inhibited by adding hydrogen peroxide of equal or more than 1.25 mol/L; The photosynthetic activity decreased from 5.8 to zero within 10 min with the decline of chlorophyll content from 5.8 mg/L to 0.2 mg/L within 30 min; In the field trial, the biomass concentration, photosynthetic activity, and chlorophyll content of C. oligoclona all decreased by more than 90% within 14 days after adding hydrogen peroxide. The pH value of river water decreased from 9.21-9.74 to 8.23-8.8 after 1 h by adding hydrogen peroxide, which kept below 9 within 14 days; Although dissolved oxygen, ammonium, total phosphorus, and residual hydrogen peroxide concentration experienced a fluctuation after adding hydrogen peroxide, they reverted to their original level in 1 d. Adding hydrogen peroxide is an effective and pollution-free method to inhibit the growth of C. oligoclona in river.