摘要
利用苏州河水的化学及生物学参数,以及水样对几种添加化学品的降解延滞期及降解率,综合评估了水体自净能力,并探讨了苏州河生态恢复初期自净能力的评估方法。对比2008年上、下游水样对醋酸钠、苯酚、苯胺、二甘醇、乙二醇、三聚乙醛等6种化学品的降解情况,比较分析了2006年及2008年两年度间苏州河自净能力的变化。相对2006年而言,2008年水体的氧化还原电位急剧下降,上、下游水体对化学品降解能力整体减弱,三聚乙醛降解能力的减弱尤为明显,降解率从2006年的77.82%和88.73%降至2008年的35.83%和65.86%。在外部有机物输入量无明显变化的情况下,上游的好氧异养菌数由2006年的4.7×104CFU/mL降为2008年的2.2×103CFU/mL。2008年苏州河上游水体对化学品(二甘醇除外)降解能力较下游水体更弱,且延滞期长。与2006年相比,2008年苏州河水体的自净能力整体减弱,上游水体自净能力的损失更为明显。
Associated with chemical and biological parameters of water quality of Suzhou Creek, the variation of lag phase and rate of degradation while adding chemicals to water samples were analyzed, water self-purification capacity was comprehensively assessed, and the method to evaluate the self-purification ability of Suzhou Creek in its process of ecological restoration was discussed. Six kinds of organic compounds, including sodium acetate, aniline, phenol, diethylene glycol, ethylene glycol and paraldehyde, were respectively added into the upstream and downstream water samples collected from Suzhou Creek in the year 2008, and the results of each additive between downstream and upstream compared. Combining the related water quality data, comparison analysis between 2006 and 2008 could be made that both the oxidation-reduction potential （ORP） and the degradation capability of all additives of upstream and downstream were sharply decreased in 2008, especially for the degradation of paraldehyde which was markedly reduced from 77.82% and 88.73% in 2006 to 35.83% and 65.86% in 2008, respectively. There were no significant changes in the external organic input during these two years, while the number of heterotrophic bacteria of the upstream water was sharply dropped from 4.7×10^4 CFU/mL in 2006 to 2.2×10^3 CFU/mL in 2008, leading to decreased degradation and adaptability of sodium acetate, aniline, phenol, ethylene glycol and paraldehyde. It was suggested that the self-purification capacity of Suzhou Creek had been comprehensively weakened on the whole, and the loss of self-purification capacity of upstream water was more significant in 2008 compared with 2006.
出处
《环境工程技术学报》
CAS
2011年第5期449-454,共6页
Journal of Environmental Engineering Technology
基金
上海市水务局科研项目(沪水科2008-09)
关键词
苏州河
微生物降解
自净
Suzhou Creek
microbial degradability
self-purification
