再生水用于深圳河流补水效果的研究

本文调查研究了深圳河主要支流采用再生水补水以后的效果。结果表明,再生水能够使河水透明度提高43%~150%,浊度下降28%~81%,色度下降23%~67%;再生水补充进入河流后,氨氮浓度最高达到13 mg/L,硝氮浓度最高达到18.5 mg/L,总磷浓度最高达到1.69 mg/L,再生水对蓝藻生长有一定抑制作用,绿藻通常成为优势藻种;再生水提高了河流环境激素类污染的生态风险,雌炔醇生态风险商范围在103~105,雌酮和雌三醇生态风险商范围在1~102;再生水汇入对河水中粪大肠杆菌的繁殖具有直接的抑制作用,其数量低于10 000个/L限值。河流进入厌氧状态后,粪大肠杆菌出现复活和再繁殖现象,影响了河流水环境的微生物安全性。本文研究成果对于再生水的选择和城市河流管理具有一定的参考价值。

Study on effect of water supplement for Shenzhen River with reclaimed water

The effect of water supplement for the main tributaries of Shenzhen River with reclaimed water is investigated herein； the result shows that（1）the transparency of the river-water can be increased by 43%~150%， while the turbidity can be decreased by 28%~81%， and the color can be decreased by 23%~67%；（2）the ammonia-nitrogen concentration can reach to 13 mg·L-1， nitrate-nitrogen concentration can reach to 18.5 mg·L-1 and the total phosphorus concentration can reach to 1.69 mg·L-1 maximatily after the inflow of the reclaimed water； simultaneously， the reclaimed water has a certain inhibition effect on the growth of the cyanobacteria， and then the chlorophyta becomes the dominant algae；（3）the eco-risk from the environmental hormone pollution of the river is increased by the ethinylestradiol（EE2）with the eco-risk quotient scope of 103~105 and the estrone（E1）and estriol（E3）with the eco-risk quotient scope of 1~102；（4）the inflow of the reclaimed water has a direct suppression effect on the reproduction of the fecal coliforms with the limit value under 10 000/L. After the river-water coming into an anaerobic status， the phenomena of resurrection and reproduction of the fecal coliforms occur， which are to impact the microbial safety of the river-water environment. Generally， the achievement got from this study has a certain reference value for both the selection of reclaimed water and the urban river management.