以磷的質量平衡解析校園人工湖之營養鹽削減效益

Phosphorus mass balance concept to approximate the nutrient phosphate removal outcome in a campus artificial lake

陳政斌(Jheng-Bin Chen)

指導教授 ： 范誠偉

國立中正大學/理學院/地球與環境科學系應用地球物理與環境科學研究所/碩士(2012年)

摘要

本研究分析中正大學寧靜湖湖水磷組成，寧靜湖為校園人工湖及校園污水處理廠放流水之承受水體。檢測期間自2010年12月至2012年3月，每一至兩週採取寧靜湖湖水、上游入水口及校園污水處理廠放流水，參考環檢署水中磷檢測方法─分光光度計/維生素丙法，檢測水體中正磷酸鹽、總溶解性磷、顆粒性無機磷、總顆粒性磷含量。結果顯示湖水總磷濃度平均為0.50 ± 0.17(P mg/L)，組成中溶解性磷約佔60%，主要為正磷酸鹽，顆粒組成則有機磷及無機磷，其濃度相當。放流水總磷平均為3.82 ± 0.82(P mg/L)，其組成主要為高濃度溶解性磷，其中又以正磷酸鹽為主，顆粒性組成則為有機磷、無機磷並存，無機磷較高；入水口總磷平均為0.11 ± 0.15(P mg/L)，含磷量低，組成為溶解性磷及顆粒性磷濃度相當，溶解性組成為正磷酸鹽與非正磷酸鹽共存。顆粒含磷量分析中，入水口及放流水懸浮固體濃度低，平均濃度分別為16 ± 13 mg/L及7 ± 2mg/L，而湖水為高懸浮固體（59 ± 11 mg/L），其中放流水含磷量最高(19.3 ± 7.3 P mg/g)，其次為入水口(7.03 ± 6.62 P mg/g)，湖水(3.48 ± 0.8 P mg/g)為三者最低。由組成及質量分析，污水處理廠放流水為湖水主要磷來源。整體而言，放流水高濃度正磷酸鹽進入湖中後，可能經由入水口稀釋及湖水去除機制，將濃度降低至1/10，減少對下游的衝擊。由總磷質量計算，進入寧靜湖的放流水磷流量(約2600 P g/day)，入水口流量（約60 P g/day），湖水出流量(約800 P g/day)，放流水流量大於湖水出流量，顯示可能湖水有吸收源，或是高估放流水流量，以顆粒性磷質量計算，可以確定湖水中有顆粒性來源產生(約130 P g/day)，但無法解釋磷的減少，針對影響湖水質量平衡因素，需進一步研究。降雨事件中，入水口可能存在較高濃度，且入水口流量大，此時湖水水質受入水口的影響較大。

關鍵字

磷 ； 質量平衡 ； 校園人工湖

並列摘要

The study is to sample and analyze the contents of phosphorus in the Tranquility Lake, National Chung Cheng University, a receiving water body from the school sewage treatment plant, conducting from December 2010 to March 2012, once every one or two weeks. The water samples include those from the lake water, the inflow of upstream, and the effluent of the sewage treatment plant. Measured phosphorus fractions were total dissolve phosphorus, soluble reactive phosphorus, total particulate phosphorus, and inorganic particulate phosphorus. The concentrations of total phosphorus in the lake water averaged 0.50±0.17 P mg/L, and the dissolve phosphorus was about 60% of total phosphorus. Soluble reactive phosphorus was the major content in the dissolve phosphorus fraction. The concentrations of total phosphorus in the effluent of the sewage treatment plant averaged 3.82±0.82 P mg/L almost soluble reactive phosphorus. The concentrations of total phosphorus in the inflow from upstream averaged 0.11±0.15 P mg/L. In the phosphorus dynamics estimations, the major input was the sewage treatment plant (about 2600 P g/day) and the inflow from upstream was about 60 P g/day. The outflows of 800 P g/day from were lower than those of total inflows, indicating the existence of phosphorus sink in the lake. Moreover, the particulate phosphorus outflow of 255 P g/day were higher than those total particulate phosphorus inputs of 130 P g/day, suggesting some particulate phosphorus were produced in the lake. High phosphorus inflows from upstream were found in the thunderstorm events, and the contents of phosphorus in the lake were then to be all inflow-dependence.

並列關鍵字

Phosphorus ； mass balance ； campus artificial lake

參考文獻

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