再生水用于景观水体的氮磷水质标准确定

污水再生利用是解决水资源短缺问题的重要措施,其中再生水回用于景观水体是主要途径之一.而防止水华爆发则是再生水景观利用的首要任务,控制再生水中的氮磷是防止水华爆发的根本措施.目前已有的景观水体水质标准中,氮磷浓度限值要求不统一,缺乏科学依据.因此再生水处理过程中氮磷控制标准执行易出现矛盾,不利于保障再生水景观利用的水质安全.再生水景观利用的氮磷控制标准,应在藻类最大生长潜力研究的基础上,通过藻类生长的Logistic模型和Monod模型、景观水体氮磷浓度模型按拟合,并结合水体自净能力和水质保障措施等综合因素加以确定.以栅藻(Scenedesmus sp)为例,通过Logistic模型和Monod模型拟合景观水体水华控制氮磷浓度限值的确定方法.

Method to establish the nitrogen and phosphorus standard of reclaimed water reused in landscape

Reclamation and reuse of wastewater are important to handle the shortage of water resource. One of the major reuse approaches is landscape reuse, in which algae bloom must be avoided. Controlling of nitrogen and phosphorus concentration in reclaimed water is a fundamental way to prevent algae bloom. The present standards on nitrogen and phosphorus concentration in landscape water are not consistent with each other, and are also lack of scientific basis. Based on the existed water quality standards, it is difficult to control nitrogen and phosphorus in the treatment of reclaimed water to prevent algae bloom. In this paper, a method was put forward to establish the nitrogen and phosphorus standard of reclaimed water reused in landscape. The nitrogen and phosphorus standard should be established on the basis of Algal Growth Potential(AGP) Test, integrated with the Logistic model, Monod model, and the model of nitrogen and phosphorus concentration in landscape water. The self-purification ability and safeguard measures of landscape water should also be considered in the establishment of reclaimed water quality. With Scenedesmus sp. as an example, the process of establishing nitrogen and phosphorus limits in landscape water was demonstrated.