南宁市城市内河黑臭分级综合评价研究

为有效避免南宁市城市内河水质出现仅透明度超标导致黑臭等级误判的情况,通过相关性分析、方差分析和多重对应分析确定评价指标和临界值,建立基于综合水质指数法的城市内河黑臭分级评价方法。结果表明:以溶解氧、氨氮、总磷和化学需氧量为黑臭分级评价指标,水体轻度黑臭和重度黑臭综合水质指数临界值分别为6.3和8.5。该评价方法结果符合实际情况,且能反映水质的时空变化情况。

Study on the Classification and Assessment of Blackening and Odorization of the Urban Rivers in Nanning City

In order to effectively avoid the water quality of the urban rivers in Nanning City from being misjudged by the level of black and odor brought by the excessive transparency, through correlation analysis, variance analysis, and multiple correspondence analysis, the evaluation indicators and critical values were determined, and a classification evaluation method for urban river black and odor based on the comprehensive water quality index method was established in this paper.The results showed that the evaluation indexes should include dissolved oxygen, ammonia nitrogen, total phosphorus and chemical oxygen demand.The critical values of comprehensive water quality index were 6.3 and 8.5 for mild and severe black odorous rivers, respectively.The results of this evaluation method were in line with the actual situation, and can reflect the temporal and spatial changes of water quality in Naning.