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。 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. 国家水环境治理重大专项( 2018ZX07101005204) ; 国家自然科学基金( 41771305; 41530858)