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.
再生水对感潮性大沙河水质变化规律的影响研究
- Title:
- Influence of Reclaimed Water on Water Environment of Tidal Dasha River
- Keywords:
- Dasha River; reclaimed water; nutrients; emerging contaminants; river water replenishment; tidal river
- 摘要:
- 再生水作为河流补水的一个重要用途，有必要开展再生水对感潮河流水质的影响研究。以感潮性大沙河为代表进行研究，沿河共设置7个取样点，取样6次，调查指标包括溶解氧、营养盐、浊度、藻类、新兴污染物等。研究表明，再生水进入大沙河后对其水质具有一定的改善作用，水体浊度从25 NTU左右降至15 NTU左右。但是，再生水也将部分营养盐带入河道，如硝态氮浓度从1.5 mg/L上升至6.0 mg/L，氨氮浓度从0.3 mg/L上升至1.0 mg/L。在大沙河7个沿岸取样点检测到32种药物及个人护理品（PPCPs）和7种内分泌干扰物（EDCs），再生水补水后水体中的PPCPs和EDCs总浓度最高分别达6 186 ng/L和1 889 ng/L，明显高于大沙河水体中相应的最高浓度（PPCPs、EDCs分别为2 694 ng/L和293 ng/L）。建议提升再生水水质，尤其提高对新兴污染物PPCPs和EDCs的去除率，降低再生水补水河流的水体风险。
- 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.
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