Abstract:The process of biogeochemical cycle change of Fe-S-P in overlying water, sediment pore water was studied in a laboratory using a static simulating device which simulated the algae- caused black-spots. Drastic biogeochemical changes of Fe-S-P happened in an anaerobic and reducing sediment environment after algae cells were added. Concentration of Fe2+, SO42- and S2- in interface of sediment-water was 4.993, 242.0, 387.57mg/L, respectively at 1st day after algae cells added, and it was the 1.8, 2.2and 18.8times higher than the contrast experiments in the same period; and the concentration of Fe2+, SO42- and S2- was 8.5mg/L, 40.0mg/L and 65.3mg/L, respectively in 4cm deep sediments. Then, Fe2+ and S2- concentration in overlying water showed a rapid increase and followed a falling trend, and its concentration reached maximum at the 2nd and 3rd day, value of 11.1mg/L and 634.6mg/L. Concentration of PO43--P in sediment increased slowly due to Fe-P desorption, and its content increased continuously from the 2nd day until the end of experiment. After adding algae cells, the concentration reached 39.450mg/L which was 242times higher than the control experiment; and also up to 10.74mg/L in 4cm deep sediment. The rapid changes of Fe-S-P indicated biogeochemical reaction in an anaerobic and reducing sediment environment after algae cells were added, and caused the Fe2+, S2- and PO43--P to diffuse into the overlying water. The algae-caused black-spot posed huge difficulties to the restoration of water ecosystems.
刘国锋, 范成新, 张雷, 申秋实, 王兆德, 韩士群. 藻源性黑水团环境效应Ⅲ:对水-沉积物界面处Fe-S-P循环的影响[J]. 中国环境科学, 2014, 34(12): 3199-3206.
LIU Guo-Feng, FAN Cheng-Xin, ZHANG Lei, SHEN Qiu-Shi, WANG Zhao-De, HAN Shi-Qun. Environment effects of algae-caused black spots Ⅲ: Impacts on Fe- S- P cycle in water-sediment interface. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(12): 3199-3206.