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Characteristics of pollutants behavior in a stormwater constructed wetland during dry days

Frontiers of Environmental Science & Engineering 2012年第5期6卷 649-657页

作者： Jianghua YU kisoo park Youngchul KIM College of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing 210044 China Department of Environment Engineering Hanseo University Seosan 356706 R. O. Korea

A stormwater wetland treating non-point source pollution （NPS） from a 64 ha agricultural watershed was monitored over a period of five months. The results indicated that pH and dissolved oxygen （DO） were increased in the wetland due highest total suspended solids to the algal growth. The （TSS） concentration was observed in the aeration pond due to the resuspension of solids, decreased in the wetland. The respective decreases in total nitrogen （TN） and total kjeldahl nitrogen （TKN） were 15.9% and 28.7% on passing through the wetland. The nitrate and ammonia were increased by 45.4% and decreased by 79.9%, respectively. These variations provided strong evidence for the existence of nitrification. The total phosphorus （TP） and phosphate had respective reductions of 52.3% and 58.2% over the wetland. The total chemical oxygen demand （TCOD） and soluble chemical oxygen demand （SCOD） were also decreased. Generally, the TN, TP and phosphate removal etticiencies were positive. These positive removal efficiencies were mainly due to microbial activities, uptake by plants, and chemical precipitation at high pH. Negative removal efficiencies can be caused by continuous rainfall activities, with short antecedent dry days （ADDs） and unstable hydraulic conditions, some other biogeochemical transformations and algal growth also being important parameters.

关键词： constructed stormwater wetland dry days,nitrification and denitrification pollutants characteristic

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Development of High Strength Steel in Hot Rolled Strip for Oil well Casing

Development of High Strength Steel in Hot Rolled Strip for O...

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第十届国际轧钢大会

作者： Kwang Kyun park Min Hyun Cho K.M.Noh H.J.Kim kisoo Kim Technical Research Laboratories POSCO

＜正＞In electric resistance welded（ERW） steel pipe of API-K55 for oil well casing,low YR（yield ratio,YS/TS） in tensile property is required to meet the API *** this article,the manufacturing conditions of hot rolling to obtain the uniform microstructures and properties of hot rolled strip were introduced,and formabihty and weldability of ERW steel pipe were also investigated.

关键词： low YR(yield ratio) API-K55 hot rolled strip middle temperature pipe forming ERW

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