摘要
监测了静态、恒温及遮光条件下不同藻密度藻水中典型致臭物二甲基三硫醚(DMTS)的质量浓度及其他常规水质指标的变化特性.在表观现象观察及嗅味物质分析的基础上,以1.0×106cells.L-1藻密度藻水作为对照,着重分析了2个特征藻密度藻水中水质变化与水体发臭、发黑的响应关系.结果表明:蓝藻在死亡分解过程中产生的DMTS质量浓度最大值与初始藻密度表现出明显相关性,拟合模型符合线性模型与二次模型.当藻密度达到1.0×107cells.L-1时,DMTS质量浓度最大值达到891.8 ng.L-1,约为嗅阈值的90倍,水体散发明显臭味;当藻密度达到1.0×108cells.L-1时,有机物浓度逐渐升高,溶解氧降为0,氧化还原电位降至-300～-400 mV,呈现极强的还原性,可导致FeS等黑色物质生成,使水体呈现微黑色.
Under the conditions of static state, thermostatic and shading, the mass concentration of typi- cal smelly substrate dimethyl trisulfide （DMTS） and the change characteristics of other water quality indi- cators were determined. According to the observing apparent phenomena and analyzing smelly snbstrate, the relationship between two kinds of＂ cell density of algal-laden water and water quality was analyzed with cell density of 1.0 × 106 cells L-1 as comparison sample. The results show that the produced DMTS concentration during the courses of dying and decomposing of algal mats shows significant correlation with the density of algae. The relationship between DMTS concentration and the density of algae fits linear and quadratic model. When the algae density is 1.0 ×107 cells L-1 , the concentration of DMTS reaches a maximum of 891.8 ng L-1, about 90 times more than the odor threshold concentration with emitting ap- preciable odor. When the algae density is 1.0 × 10s cells L-1 , the concentration of organic matter in- creases gradually with the concentration of dissolved oxygen reduced to 0. The level of oxidation-reduction potential drops to -300 to -400 mV with strong reduction characteristic, which can generate black sedi- ment of ferrous sulfide and turn the water into black.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期361-366,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家水体污染控制与治理科技重大专项(2009ZX07101-011)
关键词
蓝藻
二甲基三硫醚
溶解氧
氧化还原电位
有机物
algal
dimethyl trisulfide
dissolved oxygen
oxidation-reduction potential
organic matter
