BIEXiao-juan,FUWan-yi,ZHANGXi-hui.Influence of Reclaimed Water on Water Environment of Tidal Dasha River[J].China Water & Wastewater,2022,38(8):82-91.
Influence of Reclaimed Water on Water Environment of Tidal Dasha River
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第8期
Page:
82-91
Column:
Date of publication:
2022-04-17
- Keywords:
- Dasha River; reclaimed water; nutrients; emerging contaminants; river water replenishment; tidal river
- Abstract:
- Reclaimed water is an important way of river water replenishment. It is necessary to study the impact of reclaimed water on the water quality of tidal rivers. The Dasha River was selected as the representative of the tidal river and seven sampling points were set up, which were sampled 6 times in total. Investigations were taken for the distribution of dissolved oxygen, nutrients, turbidity, algae, and emerging contaminants in Dasha River. The results showed the reclaimed water played a positive role in the improvement of river water quality. The water turbidity decreased from 25 NTU to 15 NTU because of the replenishment. However, nutrients were also brought into the river by reclaimed water, such as the concentration of nitrate nitrogen rose from 1.5 mg/L to 6.0 mg/L and ammonia nitrogen incresased from 0.3 mg/L to 1.0 mg/L. A total of 32 PPCPs and 7 EDCs were detected at 7 sampling sites of Dasha River. The concentrations of PPCPs and EDCs in reclaimed water were 6 186 ng/L and 1 889 ng/L respectively, which were significantly higher than the corresponding concentrations of 2 694 ng/L and 293 ng/L in the waterbody of Dasha River. Thus, the reclaimed water requires advanced treatment to improve water quality and control the risk of PPCPs and EDCs to the waterbody with the replenishment of the reclaimed water.
Last Update:
2022-04-17