Lin Shufeng, Chu Wenhai, Liu An
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Sci Total Environ. 2022 Dec 10;851(Pt 1):158235. doi: 10.1016/j.scitotenv.2022.158235. Epub 2022 Aug 23.
Reclaimed water and stormwater are two important alternative water sources to mitigate water resource shortage. They can be reused by discharging into drinking water sources. Due to different sources, characteristics of dissolved organic matter (DOM, a precursor of disinfection by-products, DBPs) present in reclaimed water and stormwater would be different. This study selected reclaimed water to compare with stormwater (including both stormwater runoff and rainwater) by investigating their DOM characteristics, including concentrations, aromaticity, molecular weight, hydrophobicity/hydrophilicity, composition and DBPs formation potential. The results showed that reclaimed water had higher dissolved organic carbon (DOC) concentrations (6.02-10.8 mg/L) than stormwater (3.62-5.48 mg/L) while SUVA values of stormwater runoff (1.92-2.53 L/(mg-C·m)) were higher than reclaimed water (1.11-1.24 L/(mg-C·m)). Additionally, reclaimed water is more hydrophobic while stormwater runoff and rainwater are more hydrophilic. Although all water types included the highest fraction of DOM with molecular weight <1 kDa (43.0 %-77.5 %), reclaimed water primarily contained soluble microbial products (SMPs)-like and humic acid-like substances while stormwater runoff primarily contained humic acid-like DOM. In terms of DBPs, reclaimed water showed relatively higher formation potential than stormwater runoff while rainwater had the lowest DBPs formation potential. These results can contribute to effective water resource management. Particularly, when reclaimed water or/and stormwater are discharged into drinking water sources, these outcomes can help on efficient drinking water treatment.
再生水和雨水是缓解水资源短缺的两种重要替代水源。它们可以通过排放到饮用水源中进行再利用。由于来源不同，再生水和雨水中存在的溶解有机物（DOM，消毒副产物DBPs的前体）的特性也会有所不同。本研究选择再生水与雨水（包括雨水径流和雨水）进行比较，通过研究它们的DOM特性，包括浓度、芳香性、分子量、疏水性/亲水性、组成和DBPs生成潜力。结果表明，再生水的溶解有机碳（DOC）浓度（6.02-10.8mg/L）高于雨水（3.62-5.48mg/L），而雨水径流的SUVA值（1.92-2.53L/(mg-C·m)）高于再生水（1.11-1.24L/(mg-C·m)）。此外，再生水更疏水，而雨水径流和雨水更亲水。尽管所有类型的水都包含分子量<1kDa的DOM的最高比例（43.0%-77.5%），但再生水主要包含类似可溶性微生物产物（SMPs）和腐殖酸类物质，而雨水径流主要包含腐殖酸类DOM。在DBPs方面，再生水的生成潜力相对高于雨水径流，而雨水的DBPs生成潜力最低。这些结果有助于有效的水资源管理。特别是，当再生水或/和雨水排放到饮用水源中时，这些结果有助于高效的饮用水处理。
