scholarly journals Effect of Dissolved Organic Matter on Agglomeration and Removal of CuO Nanoparticles by Coagulation

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 455 ◽  
Author(s):  
Rizwan Khan ◽  
Muhammad Ali Inam ◽  
Muhammad Akram ◽  
Ahmed Uddin ◽  
Sarfaraz Khan ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Industrial Applications ◽  
Water Bodies ◽  
Hydrodynamic Diameter ◽  
Excess Charge ◽  
High Concentration ◽  
Potential Threat ◽  
Cuo Nps ◽  
Coagulation Process

Engineered nanomaterials (ENMs), such as copper oxide nanoparticles (CuO NPs), are emerging as pollutants extensively used in many commercial and industrial applications, thus raising environmental concerns due to their release into water bodies. It is, therefore, essential to remove these pollutants from water bodies in order to minimize the potential threat to the aquatic environment and human health. The objective of this study was to investigate the removal of CuO NPs from waters by the coagulation process. This study also explored the efficiency of coagulation to remove hydrophobic/hydrophilic dissolved organic matter (DOM) and turbidity with varying polyaluminum chloride (PACl) doses. According to the results, a high concentration of DOM affects both the CuO NPs zeta potential and hydrodynamic diameter, thereby decreasing the agglomeration behavior. At effective coagulation zone (ECR), high removal of CuO NPs (>95%) was observed for all studied waters (hydrophobic and hydrophilic waters), above ECR excess charge induced by coagulant restabilized particles in solution. Furthermore, waters containing hydrophobic DOM and those with high UV254nm values needed more coagulant dose than hydrophilic waters to obtain similar CuO NP removals. The primary mechanism involved in CuO NPs removal might be charge neutralization. These findings suggest that PACl is an effective coagulant in the removal of CuO NPs; however, water characteristics are an influencing factor on the removal performance of ENMs during the coagulation process.

scholarly journals Effects of sulfonamide antibiotics on digestion performance and microbial community during swine manure anaerobic digestion

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
Shaona Wang ◽  
Kang Du ◽  
Rongfang Yuan ◽  
Huilun Chen ◽  
Fei Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Anaerobic Digestion ◽  
Dissolved Organic Matter ◽  
Methane Production ◽  
Volatile Fatty Acids ◽  
High Throughput Sequencing ◽  
Batch Reactor ◽  
Inhibition Mechanism ◽  
Sulfonamide Antibiotics ◽  
High Concentration

The effects of four types of sulfonamide antibiotics (SAs), including sulfaquinoxaline, sulfamethoxazole, sulfamethoxydiazine and sulfathiazole, on the digestion performance during anaerobic digestion process were studied using a lab-scale anaerobic sequencing batch reactor, and the changes of the community structure in the presence of SAs were investigated with the help of high throughput sequencing. The results indicated that when SAs were added, the hydrolytic acidification process was inhibited, and the accumulation of volatile fatty acids (VFAs) was induced, resulting in the suppression of methane production. However, the inhibition mechanism of different SAs was quite different. The inhibitory effect of high concentration of SAs on the hydrolysis of solid particulate matter into dissolved organic matter followed the order of sulfaquinoxaline > sulfamethoxydiazine > sulfathiazole > sulfamethoxazole. SAs have obvious inhibitory effects on acidification and methanation of dissolved organic matter, especially sulfathiazole. The richness and the community composition of the microorganism including bacteria and archaea in the digestion system were affected by SAs. Under the effect of SAs, the relative abundance of many microorganisms is negatively correlated with methane production, among which Methanobrevibacter, a kind of Archaea, had the greatest influence on methane production.

Acquiring reproducible fluorescence spectra of dissolved organic matter at very low concentrations

2009 ◽  
Vol 60 (6) ◽  
pp. 1385-1392 ◽  
Author(s):  
B. R. H. Peiris ◽  
H. Budman ◽  
C. Moresoli ◽  
R. L. Legge
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Concentration ◽  
Low Concentration ◽  
Low Concentrations ◽  
Fibre Optic Probe ◽  
On Line ◽  
Optic Probe ◽  
Membrane Treatment ◽  
Concentration Levels

A method that would allow for fast and reliable measurements of dissolved organic matter (DOM), both at low and high concentration levels would be a valuable tool for online monitoring of DOM. This could have applications in a variety of areas including membrane treatment systems for drinking water applications which is of interest to our group. In this study, the feasibility of using fluorescence spectroscopy for monitoring DOM at very low concentration levels was demonstrated with an emphasis on optimizing the instrument parameters necessary to obtain reproducible fluorescence signals. Signals were acquired using a cuvette or a fibre optic probe assembly, the latter which may have applications for on-line or in-line monitoring. The instrument parameters such as photomultiplier tube (PMT) voltage, scanning rate and slit width were studied in detail to find the optimum parameter settings required. The results showed that larger excitation and emission slit widths were preferred, over larger PMT voltage or lower scanning rates, to obtain reproducible and rapid measurements when measuring very low concentration levels of DOM. However, this approach should be implemented with caution to avoid any reduction of the signal resolution.

scholarly journals Characterization of Dissolved Organic Matter in Landfill Leachate during Two–Stage Membrane Bioreactor Treatment

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
S. Sanguanpak ◽  
C. Chiemchaisri ◽  
W. Chiemchaisri ◽  
K. Yamamoto
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Landfill Leachate ◽  
Membrane Bioreactor ◽  
Disposal Site ◽  
Solid Waste Disposal ◽  
High Concentration ◽  
Absorption Bands ◽  
Two Stage

Landfill leachate is a complex wastewater containing high concentration of dissolved organic matter (DOM). In this study, DOM in raw leachate and treated water from pilot–scale two–stage membrane bioreactor (MBR) installed at solid waste disposal site were investigated by using fractionation method, fluorescence excitation–emission matrix spectroscopy (FEEM) and fourier transform infrared (FTIR). The fractionation results showed hydrophilic (Hyl) compound was the most abundant fraction in DOM of raw leachate, whereas the dominant fraction of DOM in mixed liquor inside MBR and its effluent was fulvic acid (FA). The fluorescent peaks of protein-like, humic and fulvic–like substances were detected in influent DOM, while the fluorescence peaks of MBR and effluent DOM were humic and fulvic-like substances. From the FTIR results, absorption bands that could be related to humic acid (HA) and FA were found in both MBR and effluent DOM. The characterization of DOM indicated that the most of Hyl and protein–like substances could be significantly removed by microbial process in MBR. Furthermore, a part of humic substance (HA and FA) could be eliminated by microbial and filtration processes.

scholarly journals Dissolved organic matter concentration changes in river waters of Latvia

2011 ◽  
Vol 65 (1-2) ◽  
pp. 40-47
Author(s):  
Māris Kļaviņš ◽  
Ilga Kokorīte ◽  
Valērijs Rodinovs
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Bodies ◽  
Biological Processes ◽  
River Waters ◽  
Organic Matter Concentration ◽  
Concentration Changes ◽  
The Impact ◽  
Matter Concentration

Dissolved organic matter concentration changes in river waters of Latvia Amounts of natural organic matter in surface waters reflect the character and intensity of biological processes in water bodies, human impact and depend on the physico-geographical environment and land-use in the catchments. Thus, analysis of the concentrations and loadings of organic substances to adjacent water bodies can be used to indicate environmental change and human impacts. This study revealed significant increasing trends of total organic carbon (TOC) and water colour in most of the studied Latvian rivers during the last decade. However, over longer time periods, there have been pronounced oscillations of TOC concentrations, stressing the importance of long-term changes of river discharge. On a yearly basis, there was a positive correlation between parameters of organic matter concentration and discharge in all selected rivers. The impact of discharge on concentrations of organic matter can be masked by other factors, such as changes in precipitation, biological processes, soil types and land-use.

scholarly journals Characteristics and Source of Dissolved Organic Matter in Lake Hulun, A Large Shallow Eutrophic Steppe Lake in Northern China

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 953
Author(s):  
Wenwen Wang ◽  
Binghui Zheng ◽  
Xia Jiang ◽  
Junyi Chen ◽  
Shuhang Wang
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Temporal Distribution ◽  
Northern China ◽  
High Concentration ◽  
Excitation Emission Matrix ◽  
Occurrence Characteristics ◽  
Parallel Factor ◽  
The Difference ◽  
High Degree

Lake Hulun, the fifth largest lake in China, is a typical eutrophic steppe lake located in the Hulun Buir Prairie. The dissolved organic matter (DOM) in the water of Lake Hulun has a high concentration. However, little is known about the occurrence characteristics and source of the DOM in Lake Hulun. The spatial and temporal distribution characteristics of DOM concentration in Lake Hulun were thoroughly surveyed, and the optical characteristics, fluorescence components and sources of DOM were analyzed by excitation emission matrix (EMM) and parallel factor analysis (PARAFAC) technology. The DOM concentration was 6.46–42.87 mg C/L, and was highest in summer and lowest in winter. The difference in the spatial distribution of DOM in winter was significant due to the ice over, and showed a trend where the concentration near the shore was higher than that in the center of the lake. Three humic-like components and one component consisting of a mixture of humic-like and protein-like substances of DOM were identified, with the former being prevalent. The humification index of DOM was 2.22–9.92, indicating that the DOM has a high degree of humification. The DOM is mainly derived from terrestrial sources, with the highest proportion (91.0% ± 8.1%) found in winter and the lowest (66.2% ± 7.7%) in summer. Given that the DOM in Lake Hulun is mainly dominated by humic-like components with a high degree humification, the DOM may have low bioactivity. However, this is just a preliminary analysis and judgment, and it is necessary to conduct other experiments such as biodegradation experiments to further study the bioavailability of DOM in Lake Hulun.

scholarly journals Comparison of absorption properties of colored dissolved organic matter in six different case 2 water bodies

2017 ◽  
Author(s):  
Ciren Nima ◽  
Øyvind Frette ◽  
Børge Hamre ◽  
Svein Rune Erga ◽  
Yi-Chun Chen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Bodies ◽  
Colored Dissolved Organic Matter ◽  
Absorption Properties

Enhanced Coagulation for Removal of Dissolved Organic Matter and Trihalomethane Formation Potential from Raw Water Supply in Sri-Trang Reservoir, Thailand

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Tassana Kueseng ◽  
Thunwadee Tachapattaworakul Suksaroj ◽  
Charongpun Musikavong ◽  
Chaisri Suksaroj
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Supply ◽  
Cationic Polymer ◽  
Ultraviolet Absorption ◽  
Raw Water ◽  
Polyaluminum Chloride ◽  
Formation Potential ◽  
Trihalomethane Formation Potential ◽  
Coagulation Process

The present research aims to examine the coagulation process enhancement for dissolved organic matter (DOM) and The present research aims to examine the coagulation process enhancement for dissolved organic matter (DOM) and trihalomethane formatation potential (THMFP) removal from a raw water supply with low turbidity and specific ultraviolet absorption (SUVA). Coagulation conditions were optimized using polyaluminum chloride (PACl), PACl with dry cationic polymer (polymer), and PACl with polymer and powder activated carbon (PAC). DOM was measured in terms of dissolved organic carbon (DOC) and ultraviolet absorption at a wavelength of 254 nm (UV-254). Results show that the optimal condition for PACl, PACl and polymer, and PACl with polymer and PAC coagulation were PACl 20 mg/L at pH 7, PACl 20 mg/L and polymer 0·1 mg/L, and PACl 20 mg/L with polymer 0·1 mg/L and PAC 10 mg/L, respectively. When the DOM contents in coagulated water were fractioned to be hydrophilic (HPI) and hydrophobic (HPO) groups, it was found that the coagulation process could effectively remove more DOC of HPO than DOC of HPI. The coagulation using PACl combined with polymer and PAC provided the highest level of DOC of HPI, DOC of HPO, Trihalomethane formation potential (THMFP) of HPI, and THMFP of HPO removal efficiencies and were shown to be 65%, 75%, 77%, and 79%, respectively.

Competitive removal of dissolved organic matter (DOM) and inorganic anions by anion exchange resins (AERs)

2012 ◽  
Vol 12 (5) ◽  
pp. 630-636 ◽  
Author(s):  
A. Phetrak ◽  
J. Lohwacharin ◽  
N. Watanabe ◽  
M. Murakami ◽  
H. Sakai ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Anion Exchange ◽  
Treatment Plant ◽  
Inorganic Anions ◽  
Order Kinetic ◽  
High Concentration ◽  
Strong Base ◽  
Anion Exchange Resins ◽  
Exchange Resins

Four strong-base anion exchange resins (AERs) with different properties were selected to investigate dissolved organic matter (DOM) removal from river water containing inorganic anions. Rapid sand-filtered water was obtained from a water treatment plant in Tokyo, Japan, and then concentrated by an ultrafiltration membrane for use in ion exchange experiments to simulate high dissolved organic carbon (DOC) and sulfate conditions. AERs removed 23–50% of DOC and 70–80% of UV254 within 30 min despite high sulfate concentration (121 mg/L). Although the materials and structure of the AERs did not affect the reduction of UV254, DOC removal was affected. The highest DOC reduction was achieved by a macroporous polyacrylic AER (Purolite), while the macroporous polystyrene IRA 910 had the lowest DOC removal. A pseudo-second-order kinetic model showed that the rate constants and the initial sorption rates of polyacrylic resins were higher than those by polystyrene resins, suggesting that more hydrophilic structure of AERs exhibited faster DOC removal. Aromatic DOM with a molecular weight (MW) of 800–3,000 Da was almost completely removed by AERs, whereas only half of aromatic DOMs smaller than 800 Da were removed by AERs. Adsorbed DOC comprised less than 6% of all exchanged anions, whereas the adsorbed sulfate was about 90% due to comparatively high concentration of sulfate in the water sample.

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