再生水补给条件下河流水质及河岸渗滤水质演变试验

由于人类活动影响加剧,永定河呈现水量锐减以及水环境持续恶化的趋势,生态环境遭到严重破坏。在此背景下,永定河生态重建工程亟待开展,生态补水方式急需确定。为探究多水源生态补水方式对河流水质及河岸渗滤水质演变的影响,开展模拟试验,探究流速、温度和土壤渗滤对再生水补水水质的影响。研究结果表明:流速增加有利于污染物降解;与高温相比,低温条件下的污染物降解能力明显优于高温,表明低温在一定程度上有利于再生水补水水质的改善;河岸渗滤水某些水质指标有一定程度的好转,但由于河底沉积物的聚集吸附作用使得通过土壤的水体轻微富营养化。最终结果表明,流速对于再生水补水水质指标影响最大。

Experimental study on the evolution of river water quality and riverbank percolation water quality under reclaimed water supply

In recent years, Yong ding River ex hibited a sharp decrease in w ater quantity , a trend o f continuous deteriorat ion of the water enviro nment, and serious damage to ecolog ical env ir onment due to the int ensified influence of human act ivities. Under t his backgr ound, t her e is an ur gent need of an eco lo gical reconstructio n pro ject and the determination of ecolog ical water replenish2 ment mode in the Yo ng ding Riv er. I n or der t o ex plo re the influence o f multi2w ater source eco log ical r eplenishment mode fo r the ev olut ion of riv er water qua lit y and riv erbank per colation water qua lit y, this study conducted a simulat ion ex periment to ex plor e the influence of flow rate, tem per at ur e and soil per colation on reclaimed w ater r eplenishment water qualit y. T he r esults show ed that the incr ease in flow velo city w as beneficial to the deg radation of pollutants. Compared with hig h temper atur e, the deg rada2 tion ca pacity o f po llutants at low temper atur e w as significantly bett er than that at hig h temperatur e, indicating that low temper2 atur e w as beneficial to the improv ement o f reclaimed water quality to some ex tent. Alt ho ug h water qualit y index es of riverbank leachat e improv ed to some ex tent, but the water passing thro ug h the soil was slightly eut ro phicatio n due to t he agg r eg atio n and adsor pt ion o f riv er bot tom sediments. The f ina l results show ed that the f low v elo city had the g reatest influence on the quality in2 dex o f reg ener ated w ater.