电化学氧化技术对藻源性湖泛的降解效果

为探索电化学氧化技术降解藻源性湖泛的可行性和实施效果,选取太湖藻华发生水域的浓缩藻类在室内稀释后,于高温黑暗条件下腐烂形成湖泛水样. 用钛基阴阳极板于24 V额定电压、100 W额定功率的变压器下在室内进行降解,并分别设置3个试验组和1个对照组. 结果表明:反应51 h后ρ(Chla)从初始的2 909.87 μg/L降至72.02 μg/L,降解率达97.6%；悬浮物〔OSM(有机悬浮物)、ISM(无机悬浮物)、TSM(总悬浮物)〕、含氮污染物〔TN、TDN(溶解性总氮)〕、COD_Mn、DOC(溶解性有机碳)的降解率分别为40.8~94.7%、37.4~58.9%、78.8%、40.1%；电化学氧化法对水体有机物的降解效果好,而短期内水体藻类污染物的自降解能力较为微弱. 电化学氧化法能有效去除湖泊水体中的藻类污染物,并且极板功率较小、反应时间短. 

Degradation of Black Water Caused by Phytoplankton Using Electrochemical Oxidation Technique

The electrochemical oxidation technique is widely used in the treatment of sewage and wastewater but rarely applied in natural waters. Black water, which frequently results from the accumulation of algal blooms and massive dead algae, has heavily polluted the water quality of natural lakes. In order to explore the degradative effects of the electrochemical oxidation technique on black water, an experiment was conducted to test the feasibility and implementation effect. A large amount of algae-laden water was collected from algae bloom zones of Lake Taihu, and black water was obtained from concentrated algae-laden water under the conditions of high temperature and darkness. Titanium matrix composites were used as the positive and negative electrodes to deal with the black water. Three repetitive treatments and control were designed, and the transformer voltage was set as 24 V with an output power of 100 W. The results showed that the chlorophyll a concentration decreased from 2909.87 μg/L to 72.02 μg/L after 51 hours, and the degradation efficiency reached 97.6%. Meanwhile, the degradation efficiency of suspended matters (total suspended matter, organic suspended matter and inorganic suspended matter), nitrogen pollutants (total nitrogen and total dissolved nitrogen), chemical oxygen demand and dissolved organic carbon were 40.8%-94.7%, 37.4%-58.9%, 78.8% and 40.1%, respectively. However, the control group showed a weak natural degradation efficiency of black water pollutants, compared with the treatments over a short time (hourly scale). The electrochemical oxidation technique showed strong degradation efficiency. This study suggests that electrochemical processing could effectively remove algae biomass and derived pollutants. This method may provide a technical support for the field treatment of black lake water due to the mini-wattage, short response time.