Lake water phosphate reduction with advanced wastewater treatment in watershed, at Lake Hamana, Shizuoka Prefecture, Japan, from 1995 to 2016
Lake water phosphate reduction with advanced wastewater treatment in watershed, at Lake Hamana, Shizuoka Prefecture, Japan, from 1995 to 2016
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DOI：
10.1007/s11356-019-06947-5
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发表时间：
2020-01-01
影响因子：
5.8
通讯作者：
Yamauchi, Satoru
中科院分区：
文献类型：
--
作者：
Kubo, Atsushi;Imaizumi, Rin;Yamauchi, Satoru
哈马纳湖是一个半封闭的咸水湖，中间是农业和住宅用地。从1995年到2016年，在该湖的12个采样点获得了营养盐、总磷和总氮的月垂直剖面。从流入湖的河流中的五个站也采集了淡水样本。大多数湖泊和所有河流站的磷酸盐、总磷和总氮浓度都有显著下降。磷酸盐浓度的下降反映了由于污水覆盖率的增加，进入湖泊的有机质和营养负荷的减少。硝态氮浓度在4个站位显著升高，而氨氮和全氮浓度显著降低。这可能是由于废水的硝化/反硝化效率低下所致。各站位地表水氮磷比均大于16，且显著增加。因此，湖泊中磷的减少和硝酸盐浓度的增加可以加强对磷的限制。
Lake Hamana is a semi-enclosed brackish lake amid agricultural and residential land. Monthly vertical profiles of nutrients, total phosphorus (TP), and total nitrogen (TN) at twelve sampling stations in the lake were obtained from 1995 to 2016. Freshwater samples were also obtained from five stations in the river flowing into the lake. Significant decreases were seen in phosphate, TP, and TN concentrations at most lake and all river stations. Decrease in phosphate concentration reflects reduced organic matter and nutrient load into the lake due to increased sewage coverage. Nitrate concentration significantly increased at four stations, whereas ammonium and TN concentrations significantly decreased. This could be due to inefficient nitrification/denitrification of wastewater. At all stations, the nitrogen to phosphate ratio in surface water was higher than 16 and increased significantly. Therefore, phosphate limitation could be strengthened by the decrease in phosphate and increase in nitrate concentrations in the lake.