scholarly journals The production process of reactive oxygen radicals in the degradation process of grass-source dissolved organic matter

2020 ◽  
Vol 32 (2) ◽  
pp. 440-449
Author(s):  
LIU Xin ◽  
◽  
WU Dinggui ◽  
JIANG Helong ◽  
SONG Na ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Production Process ◽  
Oxygen Radicals ◽  
Reactive Oxygen ◽  
Degradation Process

scholarly journals The role of reactive oxygen species in the degradation of lignin derived dissolved organic matter

2017 ◽  
Vol 208 ◽  
pp. 171-184 ◽  
Author(s):  
Derek C. Waggoner ◽  
Andrew S. Wozniak ◽  
Rose M. Cory ◽  
Patrick G. Hatcher
Keyword(s):  
Reactive Oxygen Species ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Reactive Oxygen ◽  
Oxygen Species

Development of simulation system to combine production process and wastewater treatment: calibration of bleached kraft process model through dissolved organic matter in fibreline

1997 ◽  
Vol 35 (2-3) ◽  
pp. 15-23
Author(s):  
Antero Luonsi ◽  
Sakari Halttunen
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Simulation Model ◽  
Production Process ◽  
Pollution Prevention ◽  
Basic Structure ◽  
Complete Degradation ◽  
Kraft Process ◽  
Degree Of Oxidation ◽  
Activated Sludge Processes

Simulation models for bleached kraft and activated sludge processes are being developed to be used simultaneously for integrated pollution prevention and control (IPPC). In this paper, only the simulation model (modified PROCELL) calibration for bleached kraft process is discussed. The simulation model was calibrated with dissolved organic matter (DOM) using dissolved volatile solids (DVS) values and operational information of a mill. Calibrated DOM in carryover and filtrate throughout the fibreline differed by 10% or less from the measured values in the mill. Complete degradation of DOM to inorganics within the production process is required to make the organic matter balance complete. In the calibrated fibreline, complete degradation of DOM proved to be of the same magnitude as the DOM load from bleaching filtrates (D0 and E1). Complete balance evaluation facilitates the control of the fate of DOM. Data analyzing procedure was developed to determine the basic structure of the DOM (CaHbONc). The information of conventional analyses of DOM such as organic carbon (DOC), DVS and chemical oxygen demand (DCODCr) was developed to elucidate the basic structure of DOM. The degree of oxidation is one feature derived from the structure of DOM. The degree of oxidation seemed to be less in the filtrate than in the carryover in the alkaline stages, while the reverse was occurred in the acid stages.

Organic matter content controls the N and P degradation process on biogeochemical interfaces: A micro-ecosystem scale study based on SoilChips-XPS-Zymography integrated technique in paddy soils

2020 ◽  
Author(s):  
Liang Wei
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Photoelectron Spectroscopy ◽  
Organic Matter Content ◽  
Degradation Process ◽  
Matter Content ◽  
Microbial Production ◽  
Paddy Soils ◽  
Rrna Gene ◽  
Degradation Processes

<p>The biogeochemical interfaces are hotspots for organic matter (OM) transformation. However, direct and continuouxiacis tracing of OM transformations and N and P degradation processes are lacking due to the heterogeneous and opaque nature of soil microenvironment. To investigate these processes, a new soil microarray technology (SoilChips) was developed and used. Homogeneous 2-mm-diameter SoilChips were constructed by depositing a dispersed paddy soils with high and low soil organic carbon (SOC) content. A horizon suspension on a patterned glass. Dissolved organic matter from the original soil was added on the SoilChips to mimic biogeochemical processes on interfaces. The chemical composition of biogeochemical interfaces were evaluated via X-ray photoelectron spectroscopy (XPS) and the two-dimensional distribution of enzyme activities in SoilChips were evaluated by zymography. Over 30 days, soil with high SOC content increases microbial nutrition (N and P) requirements than soil with low SOC evidenced by higher hotspots of β-1,4-N-acetaminophen glucosidase, and acid phosphomonoesterases and higher 16S rRNA gene copies. The degree of humification in dissolved organic matter (DOM) was higher and the bioavailability of DOM was poorer in soil with high SOC than soil with low SOC. The poorest bioavailability of DOM was detected at the end of incubation in soil with high SOC. Molecular modeling of OM composition showed that low SOC mainly facilitated the microbial production of glucans but high SOC mainly facilitated the microbial production of proteins. We demonstrated that SOC content or DOM availability for microorganisms modifies the specific OM molecular processing and N and P degradation processes, thereby providing a direct insight into biogeochemical transformation of OM at micro-scale.</p>

Photo-production of reactive oxygen species and degradation of dissolved organic matter by hematite nanoplates functionalized by adsorbed oxalate

2020 ◽  
Vol 7 (8) ◽  
pp. 2278-2292 ◽  
Author(s):  
Xiaopeng Huang ◽  
Qian Zhao ◽  
Robert P. Young ◽  
Xin Zhang ◽  
Eric D. Walter ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Reactive Oxygen ◽  
Euphotic Zone ◽  
Aquatic Systems ◽  
Oxygen Species ◽  
Geochemical Cycling ◽  
Photo Production

The geochemical cycling of iron and carbon can couple in unique ways in the euphotic zone of aquatic systems.

Spectral Characteristics in the Degradation Process of Colored Dissolved Organic Matter from Large Filamentous Algae Sources in Saltwater Lake

2011 ◽  
Vol 356-360 ◽  
pp. 2536-2541 ◽  
Author(s):  
Li Min Zou ◽  
Jian Hua Li ◽  
De Gang Jiang ◽  
Yu Lai Wang
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Factor Model ◽  
Spectral Characteristics ◽  
Three Dimensional ◽  
Degradation Process ◽  
Control Group ◽  
Colored Dissolved Organic Matter ◽  
Fluorescence Excitation ◽  
Humic Fluorescence

The indoor experimental study was on a large common species of filamentous green algae in the North Lake beach of Chongming Island - bristles algae liquid produced by algae growth during the photodegradation of colored dissolved organic matter (CDOM) spectral characteristics change. Absorption coefficient a (355) in the degradation experiment was reduced 27.44% , however , in the control experiment , a (355) was only 1.61% lower. In the photodegradation process of degradation experiments and control experiments, the values of M and S were increased to the different extent and the increased value of the former was higher than the latter. By using three-dimensional fluorescence spectroscopy (EEMS), the detected peak value of protein-and humic fluorescence in control experiments was little changed, while significantly increased in the degradation experiments. By the analysis of parallel factor model (PARAFAC) combined with three-dimensional fluorescence excitation - emission matrix data (EEMS), the three-component CDOM: C1, C2, C3, respectively were relative to humic fluorescence peaks A, C, and protein-like fluorescence B. In the degradation experiments, small changes were in the components of C1, however the components of C2, C3 compared with those in the control group were increased by nearly 2 times. All results showed that the photodegradation process of bristles algae liquid can cause changes of the CDOM in the structure and content, easier to produce small molecules and weak aromatic CDOM.

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