基于水足迹理论的污水处理厂评估

Water footprint assessment in wastewater treatment plants(WWTP)

水足迹作为一种水资源评估指标广泛运用于国家、区域、流域等大范围内,而鲜见于小范围内的研究,因此,将水足迹理论运用于小范围内的污水处理厂评估是ー种全新的理念和方法。基于水足迹理念对太原市某污水厂进行水足迹核算和可持续评估。研究结果表明:污水厂能大幅降低COD(W_(grey(COD))和NH_3 WF_(grey(NH_3-N))灰水足迹;若对污水厂进行技术改造,可进ー步降低COD(W_(grey(COD))和WF_(grey(NH_3-N))。日均WF_(grey(COD))和WF_(grey(NH_3-N))变化趋势一致;2015年3月WF_(grey(COD))致;2015年3月COD)和WF_(grey(NH_3-N))小于2014年3月;污水厂关键污染物灰水足迹由NH_3A决定的天数多。2014年和2015年3月污水厂均有灰水足迹不可持续的天数,但2015年3月灰水足迹可持续情况好于2014年3月。根据研究结果,制定了污水厂水足迹响应方案,同时阐述了污水厂水足迹未来的研究方向。

Water footprint（WF） as a water resources evaluation index,widely applied in wide areas including nation,region,river basin,etc.,but rarely in small areas.Applying WF to a WWTP（a small area） is a new concept and method.This paper accounts the WF and assesses its sustainability in a WWTP in Taiyuan.The results indicates WWTP can significantly reduce grey water footprint（GWF） of COD and NH3-N.If WWTP improves an old technology,it will further reduce WFgrey（COD） and WFgrey（NH3-N）.It shows the same trend of WFgrey（COD） and WFgrey（NH3-N）,per day.GWF of COD and NH3-N in March 2015 is less than in March 2014.Key pollutants of GWF in the WWTP are decided by NH3-N,more than COD.The WWTP both have the GWF unsustainable days in March 2014 and 2015.However,sustainability of GWF in March 2015 was better than in2014.This paper sets WF response options and describes future research directions in a WWTP based on the results.