污水厂尾水占主导溪流养分滞留潜力及影响因素

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Abstract To investigate the effects of wastewater treatment plant effluent on nutrient retention in streams, a case study in Modian Creek, which is a typical first-order stream of Ershibu River in Nanfei River basin and predominated by wastewater treatment plant effluent, was conducted. Potentials of ammonium nitrogen (NH₄⁺-N), nitrate nitrogen (NO₃^--N) and soluble reactive phosphorus (SRP) retention were evaluated quantitatively by nutrient spiraling metrics and its influencing factors were identified by means of regression analysis based on tracer experiments and modeling of models. Results showed that the first-order uptake coefficients of NH₄⁺-N and SRP in the main channel (λ) were an order of magnitude higher than those in the transient storage zone (λ_s), while the values of λ-NH₄⁺-N and λ_s-NH₄⁺-N were similar to λ-SRP and λ_s-SRP values, respectively. The mean values of S_w-NH₄, S_w-SRP and S_w-NO₃ were significantly larger than the whole length of Modian Creek, suggesting that the studied stream had no any ability to retain or remove nitrogen and phosphorus. Since the uptake lengths of both NH₄⁺-N and SRP were longer than that of NO₃^--N, but their uptake velocities were all lower than that of NO₃^--N, indicating that NO₃^--N retention potential was greater than those of NH₄⁺-N and SRP. Moreover, significantly adverse impacts of wastewater treatment plant effluent on nitrogen and phosphorus retention were not found through comparison with the published literature of nutrient spiraling studies in the studied stream. Regression analysis suggested that hydrological condition was key drivers influencing nutrient retention in the Modian Creek. Transient storage was significantly correlated with V_f-SRP and U-SRP (both P<0.05), but was independent on NH₄⁺-N and NO₃^--N.

Key words： wastewater treatment plant effluent nutrient retention nutrient spiraling metrics headwater stream Chaohu Lake

Received: 09 June 2017

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	LI Ru-zhong
	WU Zheng-hua
	GAO Su-di
	LUO Yue-ying
	WEI Lin

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LI Ru-zhong,WU Zheng-hua,GAO Su-di等. Potential and influencing factors of nutrient retention in a headwater stream predominated by wastewater treatment plant effluent[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 330-339.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2018/V38/I1/330

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