Basin Research Center for Water Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Water Sciences, Beijing Normal University, Beijing 100875, China.
Basin Research Center for Water Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Environ Sci (China). 2021 Aug;106:171-181. doi: 10.1016/j.jes.2020.12.018. Epub 2021 Feb 5.
Dissolved organic matter (DOM) is an important constituent of wastewater treatment plant (WWTP) effluent. A novel combined tidal and subsurface flow constructed wetland (TF-SSF-CW) of 90 L was constructed for a ten-month trial of advanced treatment of the WWTP effluent. Excitation emission matrix (EEM) fluorescence spectroscopy, parallel factor (PARAFAC) analysis and a two end-member mixing model were employed to characterize the composition and removal process of the effluent DOM (EfOM) from the WWTP. The results showed that the TF-SSF-CW performed an efficient EfOM removal with dissolved organic carbon (DOC) removal rate of 88% and dissolved organic nitrogen (DON) removal rate of 91%. Further analysis demonstrated that the EfOM consisted mainly of two protein moieties and two humic-like groups; protein moieties (76%) constituted the main content of EfOM in raw water and humic-like groups (57%) became the dominating contributor after treatment. The EfOM from the WWTP was mainly of aquatic bacterial origin and evolved to a higher proportion of terrigenous origin with higher humification in the TF-SSF-CW effluent. A common controlling treatment-related factor for determining the concentrations of the same kind of substances (protein groups or humic-like groups) was revealed to exist, and the ratio of removal rates between the same substances in treatment was calculated. Our study demonstrates that the TF-SSF-CW can be a novel and effective treatment method for the EfOM from WWTPs, and is helpful for understanding of the character of EfOM in wetland treatment.
溶解性有机物（DOM）是污水处理厂（WWTP）出水的重要组成部分。构建了一个 90L 的新型潮汐和地下流组合人工湿地（TF-SSF-CW），对 WWTP 出水进行了为期十个月的深度处理试验。采用激发发射矩阵（EEM）荧光光谱法、平行因子（PARAFAC）分析和双端元混合模型对 WWTP 出水中 DOM（EfOM）的组成和去除过程进行了表征。结果表明，TF-SSF-CW 对 EfOM 具有高效去除作用，DOC 去除率为 88%，DON 去除率为 91%。进一步分析表明，EfOM 主要由两个蛋白质部分和两个类腐殖质基团组成；蛋白质部分（76%）构成原水 EfOM 的主要含量，类腐殖质基团（57%）在处理后成为主要贡献者。该 WWTP 的 EfOM 主要来源于水生细菌，在 TF-SSF-CW 出水中演变为更高比例的陆源起源，并具有更高的腐殖化程度。揭示了存在一个共同的控制处理相关因素，决定了同种物质（蛋白质组或类腐殖质组）的浓度，计算了同种物质在处理中的去除率比值。本研究表明，TF-SSF-CW 可以作为一种新型有效的 WWTP EfOM 处理方法，有助于理解湿地处理中 EfOM 的特征。
