摘要
通过对建立在滆湖西北部夏溪河与扁担河汇合进入滆湖湖口处的前置库系统进行研究,结果表明前置库系统对入湖河流中氮、磷和藻类的去除作用明显。在稳定运行期内,可将劣Ⅴ类进水水质提高至Ⅲ～Ⅳ类,ρ(TN)和ρ(TP)也分别由1.21～3.09和0.05～0.24 mg.L-1降至0.62～1.26和0.03～0.09 mg.L-1,平均去除率均约为60%;对藻类,ρ(Chl-a)则由15.10～126.07降至4.32～42.95 mg.m-3,平均去除率为(67.55±3.06)%,最高可达82.82%。此外,在前置库系统的不同分区,调蓄缓冲区对TN、TP和Chl-a的去除作用均比较明显,与其他分区之间差异显著(P<0.05);在同一分区,对于不同水质指标,仅有生态稳定区对Chl-a的去除作用明显,且与对TN、TP的去除作用之间存在显著差异(P<0.05)。
Effects of the pre-dam system built in the northwest of the Gehu Lake, where the Xiaxi River and the Biandan River merge and flow into the lake, were investigated. Results show that the effects of the system were significant on remo-ving of N, P and algae from inflow rivers. During the stable period, the pre-dam system raised the quality of the inflow water from Category V minus to Category Ⅲ～Ⅳ, and reduced the concentrations of TN （ total nitrogen） and TP （ total phos- phorus） from 1.21 -3.09 and 0. 05 -0. 24 mg·L-1 to 0. 62 - 1.26 and 0. 03 -0. 09 mg·L-1 , respectively, with average TN and TP removal rates being around 60%. For algae, the concentration of Chl-a （chlorophyll-a） was lowered from 15.10- 126. 07 to 4. 32 -42. 95 mg·m-3, with average removal rate being （67.55±3.06）%, and maximum removal rate reaching 82. 82%. Besides, within the system, the effects of the storage buffer zone removing TN, TP and Chl-a were more obvious than those of the other zones （P 〈 0. 05）. In the same zone inconsistent in water quality index, only the eco- logical stable sub-zone had an obvious effect on controlling Chl-a, and differed significantly from the other sub-zones in TN and TP removing effect（ P 〈0. 05）.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2013年第3期273-277,共5页
Journal of Ecology and Rural Environment
基金
国家“十一五”水体污染控制与治理科技重大专项(2008ZX07101-007)
关键词
前置库
入湖河流
富营养化
滆湖
pre-dam
inflow river
eutrophication
Gehu Lake
