An investigation the optical properties and spatial distribution of dissolved organic matter (DOM) in an ecological purification system and the primary factors that affect the optical properties of the DOM was conducted. Taking the Yanlong Lake ecological purification system as an example, data from spring 2017 and 2018 were compared. The results show that the concentrations of total phosphorus and total nitrogen and the permanganate index in Yanlong Lake were 0.05-0.25, 1.25-2.75, and 3.99-7.17 mg·L, respectively. In addition, the dissolved oxygen in the effluent of Yanlong Lake increased to (11.93±1.31) mg·L, and the turbidity decreased to (13.23±2.24) NTU, while the change in the permanganate index was not significant. Principal component analysis (PCA) showed that the water quality of the Yanlong Lake raw water and water in the pre-treatment area was closely related to the inflow of exogenous sources, while the water quality in submerged plant areas and deep purification areas was dependent on endogenous effects. According to the fluorescence index, humification index, and biological source index analysis, it was found that there are new spontaneous sources of DOM in this body of water, the degree of humification is lower, and endogenous biological DOM is dominant. The PARAFAC model can be used to classify DOM into UV-fulvic acid-like components (239 nm, 304 nm/407 nm), visible light fulvic acid-like components (256 nm, 352 nm/439 nm), tryptophan-like protein (276 nm/327 nm) and humic acid (292 nm, 395 nm/491 nm). The UV absorption index indicates that the spectral intensity of DOM in the raw water, pretreatment unit, and emergent water plant area of Yanlong Lake fluctuates greatly, and the DOM spectral intensity of the submerged plant area and deep purification area is relatively stable. The factors affecting the optical properties of the DOM in terms of water quality parameters are mainly transparency, dissolved oxygen, conductivity, total nitrogen, and algae cell number.
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http://dx.doi.org/10.13227/j.hjkx.201808135 | DOI Listing |
Chemosphere
May 2023
College of Environmental Science & Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China. Electronic address:
Disgusting fishy odor could break out inside oligotrophic drinking waterbody in winter with low temperature. Nevertheless, fishy odor-producing algae and corresponding fishy odorants were not very clear, odor contribution of fishy odorant and odor-producing algae to overall odor profile were also not well understood. In this study, the fishy odorants, produced by four algae separated from Yanlong Lake, were identified simultaneously.
View Article and Find Full Text PDFSci Total Environ
March 2023
Yancheng Water Affairs Group Co., Ltd, Yancheng 224007, China.
Constructed wetlands as natural process-based water treatment technologies are popular globally. However, lack of detailed long-term assessment on the impact of seasonal variations on their performance with focus on optimal seasonal adjustments of controllable operating parameters significantly limits their efficient and sustainable long-term operation. To address this, a full-scale integrated multiple surface flow constructed wetlands-pond system situated between slightly polluted river water and outflow-receiving waterworks in a subtropical monsoon climate area of middle-eastern China was seasonally assessed over a period of six years.
View Article and Find Full Text PDFSci Total Environ
December 2022
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. Electronic address:
Hygroscopicity is one of the most important physicochemical properties of salt nanoparticles, greatly influencing the environment, climate and human health. However, the hygroscopic properties of salt nanoparticles are poorly understood owing to the great challenges of the preparation, preservation and in situ characterization. Here we show the unexpected shape- and size-dependent hygroscopic behaviors of NaNO nanoparticles prepared from molten salts using in situ environment-controlled atomic force microscopy.
View Article and Find Full Text PDFHuan Jing Ke Xue
March 2020
School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
To explore the water purification efficiency and phytoplankton control efficiency of the water source ecological purification system, and evaluate the effectiveness of the functional group (FG) and morphology-based functional group (MBFG) in response to the internal environment and water quality of the water source ecological purification system, in the summer of 2018, the water quality and phytoplankton functional groups of each unit of the Yanlong Lake ecological purification system were monitored and analyzed. The results showed that the Yanlong Lake water source ecological purification system can effectively purify the water. The average values of total phosphorus, total nitrogen, dissolved oxygen, and turbidity in the influent water were 0.
View Article and Find Full Text PDFBioresour Technol
August 2020
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
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