Read by QxMD icon Read


Chengyuan Su, Lijian Zhao, Liming Liao, Jingjing Qin, Yuxiang Lu, Menglin Chen, Mei Huang, Zhi Huang
High concentrations of grease easily inhibit anaerobic digestion. The stability of the process and microbial responses in the controlling internal circulation (CIC) reactor used for treating food waste were investigated under different grease contents and inner circulation ratios. Results showed that at the grease content of 1 g/L, the removal rates of 94% and 86-93% were achieved for chemical oxygen demand (COD) and NH3 -N, respectively. In contrast, when the grease content increased to 7 g/L, removal rates for COD and NH3 -N significantly decreased to 42...
May 21, 2018: Environmental Science and Pollution Research International
Jing Zhang, Linfeng Chen, Dan Liu, Yaxian Zhu, Yong Zhang
The interactions of pyrene (Pyr) and/or 1-hydroxypyrene (1-OHPyr) with bovine serum albumin (BSA) in binary and ternary systems were investigated using the excitation-emission matrix (EEM)-parallel factor analysis (PARAFAC) method combined with fluorescence quenching analysis and the molecular docking method. The results showed that the PARAFAC approach could be used to decompose the EEM spectra of Pyr, 1-OHPyr, and BSA in the binary and ternary systems. The binding constants of Pyr and 1-OHPyr with BSA increased from 1...
August 15, 2018: Talanta
Linxian Huang, Meilin Li, Guangchao Si, Jinglin Wei, Huu Hao Ngo, Wenshan Guo, Weiying Xu, Bin Du, Qin Wei, Dong Wei
In the present study, the responses of microbial products in the biosorption process of Cu(II) onto aerobic granular sludge were evaluated by using batch and spectroscopic approaches. Batch experimental data showed that extracellular polymeric substances (EPSs) contributed to Cu(II) removal from an aqueous solution, especially when treating low metal concentrations, whereas soluble microbial products (SMPs) were released under the metal stress during biosorption process. A three-dimensional excitation-emission matrix (3D-EEM) identified four main fluorescence peaks in the EPS, i...
May 18, 2018: Journal of Colloid and Interface Science
Keith M Somers, Bruce W Kilgour, Kelly R Munkittrick, Tim J Arciszewski
Environmental effects monitoring (EEM) has been traditionally used to evaluate the effects of existing facilities discharging liquid effluents into natural receiving waters in Canada. EEM also has the potential to provide feedback to an ongoing project in an adaptive management context, and can inform the design of future projects. EEM, consequently, can and should also be used to test the predictions of effects related to new projects. Despite EEM's potential for widespread applicability, challenges related to the effective implementation of EEM include the use of appropriate study designs, as well as to the adoption of tiers for increasing or decreasing monitoring intensity...
May 16, 2018: Integrated Environmental Assessment and Management
Qianfen Zhuang, Wei Cao, Yongnian Ni, Yong Wang
Most of the conventional multidimensional differential sensors currently need at least two-step fabrication, namely synthesis of probe(s) and identification of multiple analytes by mixing of analytes with probe(s), and were conducted using multiple sensing elements or several devices. In the study, we chose five different nucleobases (adenine, cytosine, guanine, thymine, and uracil) as model analytes, and found that under hydrothermal conditions, sodium citrate could react directly with various nucleobases to yield different nitrogen-doped carbon nanodots (CDs)...
August 1, 2018: Talanta
Eemeli Annala, Tyler Gorda, Aleksi Kurkela, Aleksi Vuorinen
The detection of gravitational waves originating from a neutron-star merger, GW170817, by the LIGO and Virgo Collaborations has recently provided new stringent limits on the tidal deformabilities of the stars involved in the collision. Combining this measurement with the existence of two-solar-mass stars, we generate a generic family of neutron-star-matter equations of state (EOSs) that interpolate between state-of-the-art theoretical results at low and high baryon density. Comparing the results to ones obtained without the tidal-deformability constraint, we witness a dramatic reduction in the family of allowed EOSs...
April 27, 2018: Physical Review Letters
Chen Wen, Xiaoyi Xu, Yunshuang Fan, Changfa Xiao, Cong Ma
Coagulation-sedimentation combined with sponge iron/ozone (CS-SFe/O3 ) technology was applied to pretreat water-based seed coating wastewater (WSCW) from pesticide manufacturing. Coagulation with polyferric sulfate at a dosage of 1.5 g L-1 and a pH of 8.0 was effective, with color and chemical oxygen demand (COD) removal rates of 96.8 and 83.4%, respectively. SFe/O3 treatment further reduced the organic content in the effluents, especially concerning the degradation of aromatic pollutants, as demonstrated via ultraviolet-visible spectrophotometry (UV-vis), excitation-emission matrix (EEM) fluorescence spectrometry, and gas chromatography-mass spectrometry (GC/MS) analyses...
May 4, 2018: Chemosphere
Bilal Aftab, Hyun-Sang Shin, Jin Hur
In this work, the changes of different organic constituents in landfill leachate were tracked in Fenton oxidation processes with different operation parameters including H2 O2 doses, pH, and the ratios of [H2 O2 ]/[Fe] via fluorescence excitation emission matrix - parallel factor analysis (EEM-PARAFAC) and two-dimensional correlation spectroscopy (2D-COS). One tryptophan-like (C1), one fulvic-like (C2), and one humic-like (C3) components were identified in the leachates. The removal behaviors of the individual fluorescent components were dependent upon the operation conditions, suggesting the existence of unique characteristics with respect to the responses to the oxidation mechanisms, which were likely altered by different operation conditions...
April 25, 2018: Journal of Hazardous Materials
Bingzhi Dong, Bo Gui, Junxia Liu, Zhihong Wang, Kaiting Tan
This paper analyzed organic foulants in coagulation-microfiltration process for Taihu lake treatment. High performance size-exclusion chromatography (HPSEC) and fluorescence excitation-emission matrixes (EEM) were applied to elucidate the influence of characteristics of organics on microfiltration (MF) membrane fouling. Results showed that coagulation pretreatment could extend the operation duration of MF based on the fact that pretreatment could effectively remove macromolecular substances as well as a portion of small molecular weight(MW)organics...
May 4, 2018: Environmental Technology
Dong-Hai Yuan, Ye-Chen An, Xiao-Song He, Chen-Ling Yan, Yu-Pai Jia, Hao-Tian Wang, Lian-Sheng He
Composting leachates were collected to investigate the fluorescent characteristic and compositional change of dissolved organic matter (DOM) and the effects of the DOM and nutrients on heavy metal distribution during a leachate combination treatment process. Excitation-emission matrix (EEM) fluorescence spectra showed that, with the progress of the treatment units, the content of fulvic-like, humic-like, and protein-like substances gradually decreased. One fulvic-like component (C1), three humic-like components (C2, C3, and C4), and three protein-like components (C5, C6, and C7) were identified in the leachate DOM by parallel factor analysis...
May 1, 2018: Environmental Science and Pollution Research International
Benjamin J Haywood, John R White, Robert L Cook
The January 2016 Bonnet Carré Spillway (BCS) opening resulted in a large-scale Mississippi River (MR) flood discharge that qualitatively and quantitatively impacted the dissolved organic matter (DOM) cycling in the Lake Pontchartrain Estuary (LPE) located in Louisiana, USA. This early season flood event was a result of the delay of snow formation caused by warmer than normal watershed temperatures. During the diversion period and the subsequent weeks, the LPE water temperature remained lower than pre-flood water temperatures, suppressing carbon cycling...
April 20, 2018: Science of the Total Environment
Bing Zhang, Piet N L Lens, Wenxin Shi, Ruijun Zhang, Zhiqiang Zhang, Yuan Guo, Xian Bao, Fuyi Cui
Bacteria and algae often coexist in the aerobic granular sludge (AGS) system in a photo-bioreactor, forming algal-bacterial granular sludge. In this study, the physicochemical characteristics and microbial attachment potential of the AGS and algal-bacterial granular sludge were comparatively analyzed. Results clearly showed that the larger and denser algal-bacterial granular sludge had stronger attachment potential compared to the AGS (as the control). A bioassay with Agrobacterium tumefaciens KYC55 indicated that N-acyl-homoserine lactones (AHLs) existed in both sludge types, but further investigations revealed that the relative AHL content of the algal-bacterial granular sludge obviously increased and slightly decreased during phases II and III, respectively, but was consistently higher than the AGS...
April 25, 2018: Applied Microbiology and Biotechnology
Ying Bai, Zhengguo Cui, Rongguo Su, Keming Qu
The indirect photodegradation behaviors of acetaminophen (APAP) were investigated in the presence of four kinds of dissolved organic matter (DOM) and were also assessed in the presence of seawater components and conditions such as salinity, pH, nitrate and bicarbonate. The results showed three important findings: firstly, in the indirect photolysis of APAP, the contributions of 3 DOM*, ·OH and 1 O2 were >85.0%, 2.3-9.9% and 0.8-2.6% at pH 8.0. Secondly, DOM was divided into four terrestrial humic-like components by Excitation-emission matrix spectroscopy (EEMs) combined with parallel factor analysis (PARAFAC)...
April 18, 2018: Chemosphere
Yong Hu, Hai-Long Wu, Xiao-Li Yin, Hui-Wen Gu, Zhi Liu, Rong Xiao, Li-Xia Xie, Huan Fang, Ru-Qin Yu
This paper proposes a flexible and novel strategy that alternating trilinear decomposition (ATLD) method combines with two-dimensional linear discriminant analysis (2D-LDA). The developed strategy was applied to three-way chemical data for the characterization and classification of samples. In order to confirm the methodology performances of characterization and classification, a series of simulated three-way data arrays and a real-life EEMs data set involving the characterization and classification of tea samples according to the tea varieties were subjected to ATLD-2DLDA analysis...
August 27, 2018: Analytica Chimica Acta
Shurong Zhang, Yijuan Bai, Xin Wen, Aizhong Ding, Jianhui Zhi
Human activities impose important disturbances on both organic and inorganic chemistry in fluvial systems. In this study, we investigated the intra-annual and downstream variations of dissolved organic carbon (DOC), dissolved organic matter (DOM) excitation-emission matrix fluorescence (EEM) with parallel factor analysis (PARAFAC), major ions, and dissolved inorganic nitrogen (DIN) species in a mountainous tributary of the Yellow River, China. Both DOM quantity and quality, as represented by DOC and DOM fluorescence respectively, changed spatially and seasonally in the studied region...
April 22, 2018: Environmental Science and Pollution Research International
Hui-Wen Gu, Shan-Hui Zhang, Bai-Chun Wu, Wu Chen, Jing-Bo Wang, Yang Liu
Oil-field wastewaters contain high level of polycyclic aromatic hydrocarbons (PAHs), which have to be analyzed to assess the environmental effects before discharge. In this work, a green fluorimetric detection method that combines excitation-emission matrix (EEM) fluorescence with parallel factor analysis (PARAFAC) algorithm was firstly developed to achieve the direct and simultaneous determination of six U.S. EPA PAHs in two different kinds of complex oil-field wastewaters. Due to the distinctive "second-order advantage", neither time-consuming sample pretreatments nor toxic organic reagents were involved in the determination...
April 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Yingcai Fan, Xiaobiao Liu, Junru Wang, Haoqiang Ai, Mingwen Zhao
Using first-principles calculations, we show that the recently synthesized two-dimensional (2D) van der Waals layered material indium selenide (InSe) nanosheets can serve as a suitable substrate for silicene and germanene, which form commensurate and stable silicene/InSe (Si/InSe) and germanene/InSe (Ge/InSe) heterolayers (HLs). The buckled honeycomb geometries and Dirac-cone-like band structures of silicene and germanene are well preserved in these HLs. The interaction between silicene (or germanene) and the InSe substrate opens up a band gap of 141 meV (or 149 meV) at the Dirac points, while electron effective masses (EEM) remain as small as 0...
April 12, 2018: Physical Chemistry Chemical Physics: PCCP
Fengsong Zhang, Linsheng Yang, Xia Liu, Yanxia Li, Huajun Fang, Xingrun Wang, Njud S Alharbi, Jiaxing Li
Steroid estrogens, such as 17β-estradiol (E2), in animal manure pose a potential threat to the aquatic environment. The transport and estrogenicity of estrogens influence the sorption of estrogens to dissolved organic matter (DOM) in animal manure, and composting treatment alters the structure and composition of the manure. The objectives of the present study were to identify the contribution of the molecular composition of DOM of composted manure to the sorption of E2 and then elucidate the dominant mechanisms involved in the interaction of E2 with manure-derived DOM...
April 4, 2018: Environmental Science and Pollution Research International
Wenlan Yang, Jicheng Wang, Ming Hua, Yanyang Zhang, Xinxing Shi
Effluent organic matter (EfOM) in bio-treated wastewater generally has negative impacts on advanced wastewater treatment processes. Thus, a comprehensive characterization of EfOM would help determine feasibility of wastewater treatment. The aim of this work was to characterize EfOM originating from four coking wastewater treatment plants (WTPs) in China, using specific UV absorbance (SUVA), EfOM fractionation, size exclusion chromatography, and excitation-emission matrix (EEM) fluorescence spectroscopy. It was found that the predominant species in all the EfOM samples were hydrophobic compounds with high SUVA values...
March 26, 2018: Chemosphere
Jian-Zhen Zhou, Xian-Qiu Zhang, Wen-Ming Xie, Shun-Qing Yang, Ming-Xia Du, Ke-Wei Dai, Xue Han
Aquatic plants are widely used for treating wastewater treatment plant secondary effluent. During this process, some residual activated sludge in the secondary effluent is intercepted and attaches to the plant roots. However, the effect of the attached activated sludge on nutrient removal in secondary effluent has up to now been unknown. Aiming at this problem, this investigation was conducted to compare the nutrient removal rates in secondary effluent by washed Pistia stratiotes (washed batch) and Pistia stratiotes with activated sludge attached to the roots (study batch)...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"