scholarly journals Removal Characteristics of Effluent Organic Matter (EfOM) in Pharmaceutical Tailwater by a Combined Coagulation and UV/O3 Process

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2773
Author(s):  
Jian Wang ◽  
Yonghui Song ◽  
Feng Qian ◽  
Cong Du ◽  
Huibin Yu ◽  
...  

A novel coagulation combined with UV/O3 process was employed to remove the effluent organic matter (EfOM) from a biotreated pharmaceutical wastewater for harmlessness. The removal behavior of EfOM by UV/O3 process was characterized by synchronous fluorescence spectroscopy (SFS) integrating two-dimensional correlation (2D-COS) and principal component analysis (PCA) technology. The highest dissolved organic carbon (DOC) and ratio of UV254 and DOC (SUVA) removal efficiency reached 55.8% and 68.7% by coagulation-UV/O3 process after 60 min oxidation, respectively. Five main components of pharmaceutical tail wastewater (PTW) were identified by SFS. Spectral analysis revealed that UV/O3 was selective for the removal of different fluorescent components, especially fulvic acid-like fluorescent (FLF) component and humus-like fluorescent (HLF) component. Synchronous fluorescence/UV-visible two-dimensional correlation spectra analysis showed that the degradation of organic matter occurred sequentially in the order of HLF, FLF, microbial humus-like fluorescence component (MHLF), tryptophan-like fluorescent component (TRLF), tyrosine-like fluorescent component (TYLF). The UV/O3 process removed 95.6% of HLF, 80.0% of FLF, 56.0% of TRLF, 50.8% of MHLF and 44.4% of TYLF. Therefore, the coagulation-UV/O3 process was proven to be an attractive way to reduce the environmental risks of PTW.

2017 ◽  
Vol 14 (2) ◽  
pp. 91 ◽  
Author(s):  
Xu-jing Guo ◽  
Yun-zhen Li ◽  
Yan-hong Feng ◽  
Dong-hai Yuan

Environmental contextDissolved organic matter (DOM) plays an important role in influencing the migration and ultimate fate of metals. Different sources of pollution resulted in changes in the structure of sediment DOM in Lake Wuliangsuhai. We investigate the binding properties of DOM with CuII and HgII using fluorescence quenching combined with two-dimensional correlation spectroscopy (2D-COS) in order to demonstrate the influence of different sources of DOM on metals. AbstractDissolved organic matter (DOM) was collected from three sampling sites (L1, L2 and L3) in Lake Wuliangsuhai. L1 received upstream industrial wastewater and domestic sewage. L2 had suffered from agricultural non-point source pollution. L3 was situated in the lake outlet area. The complexation of DOM with CuII and HgII was investigated based on fluorescence quenching of the synchronous fluorescence spectra on the addition of CuII and on two-dimensional correlation spectroscopy (2D-COS). The synchronous and asynchronous maps derived from 2D-COS provided a clear picture of the heterogeneous distribution of CuII and HgII binding sites, which was not readily detected using only the synchronous fluorescence spectra. CuII and HgII complexation was stronger at shorter wavelengths than at longer wavelengths. Moreover, fluorescence quenching also occurred intensely in the fulvic-like regions (363nm for DOM-Cu in L2 and 365nm for DOM-Hg in L1). The logarithms of the stability constants (log KM) ranged from 4.42 to 6.23, from 4.75 to 4.86, and from 4.80 to 5.73 for DOM-Cu in L1, L2 and L3, respectively, depending on the wavelength. DOM at the longer wavelengths exhibited a higher log KM than that at the shorter wavelengths, and the f values in the protein-like region were clearly high. These results suggest that the influence of the structural and chemical properties of DOM on CuII binding may differ for DOM from different sources. The combined approach of fluorescence quenching and 2D-COS could be applied as a tool for evaluating the metal binding site heterogeneity of DOM.


2020 ◽  
Vol 12 (7) ◽  
pp. 2660
Author(s):  
Vandayse Abades Rosa ◽  
Joaquim Pedro Soares Neto

Os sistemas agroflorestais (SAF’s) têm permitido a recuperação de áreas degradadas, a produção de cultivos de alimentos, madeiras e fibras, além de gerar serviços ambientais, como aumento da matéria orgânica do solo e conservação da biodiversidade. Esse trabalho teve como objetivo avaliar os efeitos dos SAF’s nos atributos físicos do solo e no estoque de carbono em um Neossolo Quartzarênico órtico dos cerrados do oeste da Bahia. Os aspectos avaliados foram: Cerrado nativo, sistema com cacau/banana/arvores nativas com 18 anos de uso (SAF.1), eucalipto/pastagem com 8 anos de uso (SAF.2) e eucalipto de rebrota/pastagem (SAF.3). As amostras foram coletadas em camadas de 0,0-0,10; 0,10-0,20; 0,20-0,30; 0,30-0,40 e 0,40-0,50 m em quatro repetições em cada talhão e a análise de variância processada de acordo como delineamento inteiramente casualizado, além disso, realizou-se uma análise de componentes principais com o objetivo de verificar quais parâmetros poderiam diferenciar ou indicar similaridade entre os sistemas.  Os sistemas apresentaram alterações na densidade do solo, diâmetro médio ponderado, diâmetro médio geométrico, agregados maiores que 2 mm, agregados menores que 2 mm e estoque de carbono orgânico. Na camada superficial todos os sistemas apresentaram DS superior ao da CN. DMP, DMG, agregados maiores que 2 mm e estoque de carbono foram alterados pelos SAF´s, principalmente nas camadas até 0,30 m. A analise de componentes principais mostrou que que tanto os atributos físicos como o carbono apresentaram altas correlações com a componente principal 1 e apenas o carbono com alta correlação com a componente principal 2. Physical Attributes and Carbon Stock in Agroforestry Systems in the “Cerrados” of Western BahiaA B S T R A C TAgroforestry systems (SAFs) have allowed the recovery of degraded areas, the production of food, wood and fibers crops, as well as generating environmental services such as increased soil organic matter and biodiversity conservation. The aim of this work was to evaluate the effects of SAFs on soil physical attributes and carbon stock in a Quartzarenic Orthic Neosol of the “Cerrados” of western Bahia. The evaluated aspects were the native “Cerrado”, system with cacao / banana / native trees with 18 years of use (SAF.1), eucalyptus / pasture with 8 years of use (SAF.2) and eucalyptus of regrowth / pasture (SAF.3). Samples were collected in layers of 0.0-0.10; 0.10-0.20; 0.20-0.30; 0.30-0.40 and 0.40-0.50m in four replicates in each plot and analysis of variance processed according to a completely randomized design. In addition, an analysis of main components was carried out in order to verify which parameters could differentiate or indicate similarity between the systems. The systems presented changes in soil density, weighted mean diameter, geometric mean diameter, aggregates larger than 2 mm, aggregates smaller than 2 mm and organic carbon stock. In the surface layer, all the systems presented DS higher than of that of CN. DMP, DMG, aggregates larger than 2 mm and carbon stock were altered by SAF's, mainly in layers up to 0.30 m. Principal component analysis showed that both physical attributes and carbon had high correlations with the main component 1 and only the carbon with high correlation with the main component 2.Key words: Soil quality, CO2 sequestration, organic matter.  


Author(s):  
Jeonghyun Kim ◽  
Yeseul Kim ◽  
Sung Eun Park ◽  
Tae-Hoon Kim ◽  
Bong-Guk Kim ◽  
...  

AbstractIn Jeju Island, multiple land-based aquafarms were fully operational along most coastal region. However, the effect of effluent on distribution and behaviours of dissolved organic matter (DOM) in the coastal water are still unknown. To decipher characteristics of organic pollution, we compared physicochemical parameters with spectral optical properties near the coastal aquafarms in Jeju Island. Absorption spectra were measured to calculate the absorption coefficient, spectral slope coefficient, and specific UV absorbance. Fluorescent DOM was analysed using fluorescence spectroscopy coupled with parallel factor analysis. Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) were measured using high-temperature catalytic oxidation. The DOC concentration near the discharge outlet was twice higher than that in natural groundwater, and the TDN concentration exponentially increased close to the outlet. These distribution patterns indicate that aquafarms are a significant source of DOM. Herein, principal component analysis was applied to categorise the DOM origins. There were two distinct groups, namely, aquaculture activity for TDN with humic-like and high molecular weights DOM (PC1: 48.1%) and natural biological activity in the coastal water for DOC enrichment and protein-like DOM (PC2: 18.8%). We conclude that the aquafarms significantly discharge organic nitrogen pollutants and provoke in situ production of organic carbon. Furthermore, these findings indicate the potential of optical techniques for the efficient monitoring of anthropogenic organic pollutants from aquafarms worldwide.


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