论文部分内容阅读
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 a long-term drought and water shortages. The recharge of reclaimed water has effectively restored the dry Yongding River ecosystem. However, research on the quality of reclaimed water is urgently needed to provide technical support for its rational utilization and water quality safety. Through the sampling, indoor and outdoor experiments and data analysis of the upstream reservoir water and the recharge water, the conclusions are as follows: The reclaimed water is highly alkaline, rich in salt and nitrogen and phosphorus, of which the nitrate nitrogen is the main form of soluble nitrogen and the content of heavy metals is very low . In addition to fluoride ion, the main ions, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and phosphate after the Garden Expo wetland purification significantly reduced. According to Gibbs diagram, ion relationship and pH-pe relationship analysis, it was found that the chemical composition of water is mainly affected by evaporation-crystallization and water-rock interaction (mainly the dissolution of dolomite, calcite and gypsum and other carbonate and silicate minerals) Cation Exchange Adsorption of Sodium and Calcium Magnesium and Control of Nitrification.