| 基于连续监测的城市内河返黑返臭机制初探:以南宁市二坑溪为例 |
| 摘要点击 1385 全文点击 556 投稿时间：2019-09-27 修订日期：2019-11-29 |
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| 中文关键词 黑臭水体 连续监测 返黑返臭 水体微生物 河道底泥 |
| 英文关键词 black odorous water continuous monitoring back to black odor water body microorganisms sediment |
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| 中文摘要 |
| 黑臭水体严重危害城市生态功能，"水十条"的颁布为实现城市黑臭水体的污染整治目标制定了时间表.城市黑臭水体治理过程中，大量治理后的水体出现返黑返臭现象.为研究这一现象的原因，采用多参数水质检测仪和化学分析方法，对治理后返黑返臭的南宁市二坑溪水体进行了24 h连续监测和月度动态监测.结果表明，降雨过程与水体氨氮浓度相关性显著（P<0.01），气温与水体氨氮浓度变化趋势正相关（r=0.23，P<0.05），与水体透明度变化趋势负相关（r=-0.33，P<0.01），显示治理后水体返黑返臭与内源污染物的微生物降解和外源污染物的输入有关.综上，为了防止治理后的城市黑臭水体返黑返臭，应当关注河道底泥等内源污染物及其控制技术，综合采取生态治理手段减少外源污染物输入，才能最终实现城市黑臭水体长效治理. |
| 英文摘要 |
| Black odorous water seriously endangers urban ecological functions. The "Water Pollution Prevention Action Plan" promulgated by the State Council has attached great importance to this issue and set a timetable for achieving the goal of pollution remediation of the urban black odorous water problem. However, in the process of managing the city's black odorous water, we found that the apparent governance effect is not sustainable. Many of the urban waters that have been treated to become clear have returned to a black odorous state. This problem has constrained the completion of the black odorous water control plan, and urgently needs to be resolved. To explain the reason for this phenomenon, we chose the Erkeng Stream in Nanning as the research object, which is a water body that returns to a black odorous state after treatment. We used a multi-parameter water quality tester and chemical analysis method to carry out daily continuous monitoring for 24 h and monthly dynamic monitoring of the water body. The results showed that the rainfall process was significantly correlated with the ammonia nitrogen concentration in the water (P<0.01), and the temperature was positively correlated with the trend of ammonia nitrogen concentration in the water (r=0.23, P<0.05), which in turn was negatively correlated with the change trend of water transparency (r=-0.33, P<0.01). The above results show that the return of the black odorous state may be related to the microbial degradation of endogenous pollutants and the input of external pollutants. The reason may be:① The microorganisms are driven by light and temperature to promote the development of water in the direction of the black odorous state; ② Contaminants carried by rainfall promote the formation of black odor in water bodies. In short, in the context that internal pollution cannot be completely eradicated and external pollutants are difficult to control effectively, to prevent the treated urban water body from returning to a black odorous state, attention should be paid to endogenous pollutants such as river sediment and its control technology. Moreover, ecological control measures should be comprehensively adopted to reduce the input of external source indicators. |
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