深圳市水质净化厂出水再生利用水质评估

Water Quality Assessment of Effluent Recycling in WWTPs in Shenzhen City

双碳背景下污水再生利用上升到新的发展高度。深圳作为全国严重缺水城市之一,2021年遭遇建市以来最严重缺水,全市正多措并举解决用水缺口,其中城市杂用水实现100%替代应急方案。再生水水质保障是再生水安全利用的前提,为此,文中以深圳市原特区内8座水质净化厂为例,评估出水再生利用达标状况,并提出水质改善措施。结果表明,水质净化厂出水再生利用色度、TDS、余氯和埃希氏大肠菌群指标存在超标或不达标,DO指标存在不达标风险。水质综合评估显示,出水再生利用综合水质较优。基于5项超标/不达标风险因子,提出水质改善管理优化措施、工程提升措施及短期非工程措施,以扩大再生水使用范围和用量,缓解目前全市面临的抗旱保供水紧张局面。

The reuse of recycling water has reached a new development level under“dual carbon”goals.As one of the cities with severe water shortage at home,Shenzhen suffered from the most serious water shortage since the establishment of the city,and the city was taking multiple measures to solve water shortage,among which urban miscellaneous use achieved 100%replacement emergency planning in 2021.Quality assurance of reclaimed water is the premise of safe utilization of reclaimed water.Therefore,eight wastewater treatment plants(WWTPs)in the original Shenzhen Special Zone were taken as the main evaluation object,the status of effluent recycling up to standard was evaluated and water quality improvement measures was put forward.Results showed that the chroma,TDS,residual chlorine and Escherichia coli index of effluent recycling in WWTPs exceeded or failed to reach the standard,and DO index was a risk of sub-standard.The comprehensive assessment of water quality showed that the comprehensive water quality of effluent recycling was better.Based on the five risk factors of exceeding standard/not up to standard,management optimization measures,engineering upgrading measures and short-term non-engineering measures were put forward for water quality improvement to expand the scope of reclaimed water use and dosage,which could alleviate the tension of drought-fighting water supply.