摘要
北京长期面临干旱和水资源短缺,再生水补水有效恢复了干涸的永定河生态系统,但亟需加强对再生水水质的研究,为其合理利用和水质安全提供技术支撑。通过对上游水库水及补水后河水的采样、室内外实验和数据分析,结论如下:再生水碱性较高、富含盐分和氮磷,其中硝态氮为可溶性氮主要形态,而重金属含量极低。除氟离子外,主要离子、氨氮、亚硝态氮、硝态氮和磷酸盐经过园博园湿地净化后明显降低。结合Gibbs图、离子关系及pH-pe关系分析,发现水化学成分主要受蒸发-结晶和水岩作用(主要为白云石、方解石和石膏以及其他碳酸盐和硅酸盐矿物的溶解作用)、钠与钙镁的阳离子交换吸附作用以及硝化作用控制。
Beijing has been facing long -term drought and water resources shortage, and the replemshment ot reclaimed water can effectively recover the dry Yongding River. However, it is necessary to monitor and study the water quality of the reclaimed water. By the sampling, field and laboratory experiments, and analysis of the upstream reservoir and river water data, we got some conclusions as follows ： reclaimed water has high alkalinity, salt, nitrogen （major forms： nitrate） and phosphorus, while the contents of heavy metals are low. Significant characteristics of the spatial variation are that the content of major anions and cations, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and phosphate （ except fluorine） decrease significantly after the treatment of wetland in Yuanboyuan Park. Combined with the Gibbs diagram, the relationships of ions and pH - pe were found that the chemical compositions are controlled by evaporation crystallization and water rock interaction （dolomite, gyp- sum, calcite and other carbonate and silicate mineral）, and the reaction of cation exchange adsorption （ sodium, calcium and magnesium）and the nitrification.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2017年第8期108-115,共8页
Journal of Arid Land Resources and Environment
基金
中国林业科学研究院青年培育项目(CAFYBB2014QA032)
中国林业科学研究院基本科研业务费项目(CAFINT2014C13)资助
关键词
再生水
水化学
重金属
永定河
reclaimed water
water chemistry
heavy metal
Yongding River
