CAJ | 학술논문

以嘉兴河道底泥和河水为研究对象，以上覆水中氮的存在形态及浓度作为考察指标，通过小试实验模拟了实际受纳水体在四种自然/引水条件(底泥是否存在、复氧与否、不同流速和温度)下的自净过程。结果表明：在无大气复氧条件下，厌氧微生物活性较高而好氧微生物活性较低，使得氨态氮在底泥中厌氧微生物的活动下大量释放积累并影响了其硝化作用及好氧反硝化作用。低温下底泥和上覆水中微生物的活性均较低，氮的释放及转化均受影响。因此，在引水工程中可增加跌水等工程以增加受纳水体的复氧能力，夏天引水时可适当减少引水时间和流量，延长引水周期。
이가흥하도저니화하수위연구대상，이상복수중담적존재형태급농도작위고찰지표，통과소시실험모의료실제수납수체재사충자연/인수조건(저니시부존재、복양여부、불동류속화온도)하적자정과정。결과표명：재무대기복양조건하，염양미생물활성교고이호양미생물활성교저，사득안태담재저니중염양미생물적활동하대량석방적루병영향료기초화작용급호양반초화작용。저온하저니화상복수중미생물적활성균교저，담적석방급전화균수영향。인차，재인수공정중가증가질수등공정이증가수납수체적복양능력，하천인수시가괄당감소인수시간화류량，연장인수주기。
In order to investigate the effect of the water diversion on the self-purification of the receiving water, bench-scale experiments using the nitrogen nutrients as water quality index were conducted and four influencing factors (sediment, reaeration, flow velocities and temperature) were evaluated. The sediment and model water used in experiments were withdrawn from Jiaxing rivers. The results suggest that river sediment can release the pollutants to the overlying water, which results in the accumulation of nitrogen and reduction of the conversion efficiency, but decrease in TN content of the overlying water may be obtained. Rearation can significantly promote the nitrogen transformation, revealing that water fall could be a choice for improving the self-purification capacity of overlying water. Increasing velocity is able to improve dissolved oxygen in the overlying water, but also lead to the sediment resuspension and pollutant release. The water temperature is positively related to the nitrogen conversion. It can be concluded that short diversion time, a smaller water diversion flow rate and a longer diversion interval in summer benefit the self-purification of receiving water.