supply of dissolved organic matter to aquatic ecosystems autochthonous sources
Effect of dissolved organic matter (DOM) and biofilm on the adsorption capacity of powdered activated carbon in activated sludge
... loading of 3,5-DCP onto PACT and control reactors - 252 - Journal of Water and Environment Technology, Vol.1, No.2, 2003 3.2 Effects of dissolved organic matter (DOM) on adsorption capacity of PAC ... other dissolved organic matters (DOM) and biofilm attached onto PAC However, it is not clear that the effect of DOM and biofilm attached onto PAC were decrease in adsorption capacity of PAC in the ... amount of organic carbon was indicator as the amount of biofilm developed on PAC shows the amount of organic carbon on PAC after each incubation Figure Figure shows the adsorption isotherm of new...
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Biological Alteration of Zinc Complexation Characteristics of Dissolved Organic Matter in Domestic Wastewater Treatment Plant Effluent under River Water Environment
... (20360239) of Japan Society for the Promotion of Science (JSPS) REFERENCES Brooks M L., Meyer J S and Boese C J (2007) Toxicity of copper to larval Pimephales promelas in the presence of photodegraded ... variation of labile Zn during the incubation revealed a slight increment of the labile Zn concentration (from 2.1 µg/L to 2.5 µg/L) in the sample after month of incubation Decline of total ambient ... seems persistent in receiving waters of urban environment It may be important to study the long-term biological alteration of organic matter for the prediction of heavy metal speciation in bay or...
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Influence of Phosphorus Concentration on the Biodegradation of Dissolved Organic Matter in Lake Biwa, Japan
... particulate organic matter did not affect CODMn, the possibility of accumulation of dissolved organic matter (DOM) is pointed out (Imai, 2002) On the other hand, Takahashi (1999) reported that dissolved ... threshold of DP for biodegradation was in the range of 0.003 to 0.004 mgP/L and biodegradation activity dropped to half of the maximum value when DP was in the range of 0.006 to 0.007 mgP/L Effect of ... Behavior of organic matter in Lake Biwa, Annual Rep Lake Biwa Res Inst., 22, 161-170 (in Japanese) Hayakawa K and Takahashi M (2002) Behavior of dissolved organic matter in the northern basin of Lake...
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Controls of bioavailability and biodegradability of dissolved organic matter in soils
... Production of refractory dissolved organic matter by bacteria Science 292, 917 – 920 Oikari, A., Kukkonen, J., Virtanen, V., 1992 Acute toxicity of chemicals to Daphnia magna in humic waters Sci Total ... these reactors are the release of DOM into the solution and the adsorption of DOM onto the biofilms Furthermore, it seems impossible to determine the pool sizes and the residence times of a rapidly ... dynamics of dissolved organic matter in soils: a review Soil Sci 165, 277 – 304 Kalbitz, K., Schmerwitz, J., Schwesig, D., Matzner, E., 2003 Biodegradation of soil-derived dissolved organic matter...
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Correlation of the partitioning of dissolved organic matter fractions with the desorption of cd
... fractionation and characterization of the organic matter allows comparisons to be made between soils both rich and poor in solid phase organic matter We have not made additions to the soils; neither trace ... metal concentrations nor organic matter contents have been altered This work contributes to the mounting evidence that illustrates the importance of the role of organic matter in metal mobility ... 2002) Dissolved natural organic matter has also been implicated in preventing the sorption of Pb onto a sandy soil (Jordan et al., 1997) Further analysis of the data reveal that the presence of...
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Fouling and accumulation of dissolved organic matter in membrane bioreactors
... ACCUMULATION OF DISSOLVED ORGANIC MATTER IN MEMBRANE BIOREACTORS LIANG SHUANG (B Eng., Qingdao Technological University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CIVIL ... Since the concentration of DOM is normally several orders of magnitude less than that of MLSS, its contribution to the total filtration resistance is often intuitively supposed to be insignificant ... shown to be inhibitory to the metabolic activity of activated sludge and also exert a negative impact on membrane permeability due to organic fouling Huang et al (2000) investigated the behavior of...
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Transport and fate of persistent toxic organic chemicals in aquatic ecosystems: the Niagara River to St Lawrence River Estuary example pptx
... sediments Bottom sediments of lakes and impoundments are often major sinks and sites of eventual burial of PTOCs Distribution patterns of PTOCs in lake bottom sediments provide clues to sites of maximum ... Transport and fate of persistent toxic chemicals in aquatic ecosystems 23 bottom sediment cores have been of great value in revealing long-term historical trends in inputs of PTOCs to the system Example ... carbon content of only some % or less However, some of this organic content can be in the form of thin organic coatings on the mineral substrates In fact, partitioning of PTOCs onto aquatic particulates...
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Removal of Nutrients, Organic Matter and Heavy Metals from Paddy Field Drainage by Charcoal
... OUT points in Fig (b) Concentrations of total organic carbon (TOC), - 11 - Journal of Water and Environment Technology, Vol 7, No 1, 2009 total nitrogen (TN), total phosphorous (TP) and heavy metals ... the behavior of TP differs from that of TOC and TN in the equipment The CVs in heavy metals were larger than those of TOC, TN and TP Especially, the CV of Fe changed from 0.73 at IN to 1.47 at ... considered to be the reason for the high adsorption rate attributed to the pure surface of charcoal The reduction rate of TOC in this test was lower than that of the batch test because the TOC average...
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Input and output of dissolved organic and inorganic nitrogen in subtropical forests of South China under high air pollution docx
... indicated that DIN and DON might have different sources −1 −1 at our site Dissolved organic N input amounted to 17.8 kg N yr , accounting −1 for 36% of total dissolved N (TDN) input (47.6 kg N in 2005, ... spring of 2003 to collect soil solutions Each lysimeter was connected to a L bottle using the steep slope of the sites to facilitate sampling Previous study showed that more than 70% of the fine ... 2006) Forest ecosystems have been shown to vary in their responses to increased N deposition The timing and magnitude of response are thought to depend largely on the nutrient status of the forest...
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chemistry of soil organic matter
... soil organic matter Effects of management on soil organic matter 173 173 173 175 175 175 175 177 184 185 XI1 CONTENTS Effect of long term cropping Effect of ... distribution of organic sulfur in soil 275 Forms of organic sulfur 276 278 Amount and distribution of organic sulfur 279 Effect of soil forming ... underestimated According to Bohn (1976), the decay of soil organic matter provides the largest CO, input into the atmosphere It is true that deeper C deposits in the form of marine organic detritus,...
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Kinetics of natural organic matter as the initiator, promoter and inhibitor in water ozonation and its influences on the removal of ibuprofen
... collected using the bottletop dispenser at designated time for a period of up to 30 for the measurements of ozone, pCBA and ibuprofen To stop further degradation of pCBA and ibuprofen, ozone was quenched ... The aims of this study were to develop a new method to quantify these different reaction rate constants of NOM in water ozonation and to study their influences on the removal of ibuprofen, a commonly ... be used to determine the different rate constants of NOM was developed With the addition of an external inhibitor (tert-butanol), the rate constants of NOM as the initiator and inhibitor can...
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Leaching of arsenic in response to organic matter contamination in groundwater treatment practice
... presence of organic matter in AIRU feed water was investigated under dosage-response observations in multiple sets of laboratory reactors In case of simulated wastewater organic contaminations of 15 ... = Total Organic Carbon - 31 - Journal of Water and Environment Technology, Vol 7, No 1, 2009 Laboratory study Laboratory-scale AIRU was designed and tested under variable dosages of organic matters ... oxidation of organic matter because the arsenate/arsenite oxidation/reduction potential is +135 mV (Oremland and Stolz, 2003) Organic matter is ubiquitous in natural waters and typically found at TOC...
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Seasonal Changes of Shallow Aquatic Ecosystems in a Bird Sanctuary Pond
... extraction (Marker et al 1980) Phytoplankton and zooplankton samples were collected twice a month from March to November 1999 from the water surface Phytoplankton with unfiltered water were fixed ... with a glutaraldehyde solution Samples of zooplankton were collected using a plankton net (NXX25) and fixed in the same manner as for phytoplankton Plankton genera were identified and counted ... than 98% of TWW during the surveillance period Total weight of each species and its ratio to TWW for 10 dominant species are shown in Table As a result of the observations, seasonal change of TWW...
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Tolerance Level of Dissolved Oxygen to Feed into Anaerobic Ammonium Oxidation (anammox) Reactor
... concentrations of the two reactors The maximum nitrogen conversion rate of each reactor at the influent DO of about 0.2 mg/L was set to an anammox activity value of 1.0, and for the other concentrations of ... necessary primarily to mix the influent and to remove the nitrogen gas bubbles that formed on the surfaces of the gel carriers HRT was set to hours The to in the reactor was monitored and adjusted ... conversion rates over time of two reactors In reactor 1, the nitrogen conversion rate had decreased from 2.9 to 1.3 kg-N/m3/d when influent DO of mg/L had been fed into reactor After that, the DO...
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Tài liệu Organic matter distribution of the root zone in a constructed subsuface flow wetland pptx
... the existing of micro-organisms in the wetland system Composed organic matters synthesize dark, amorphous, colloidal mass, called humus Humus is the active component of soil organic matter and ... in CSFW absorbs and stores OM several years This accumulation potentially leads to a decline of the filter ability of the constructed wetland The objective of this study is to survey the vertical ... of OM in terms of interpolated contour graphics at three depths 20 cm, 50 cm and 80 cm The differences in distribution of OM contents among side cross sections are low Fig 3: Contour graphs of...
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Tài liệu PATHWAYS OF ORGANIC CHEMICAL CONTAMINATION IN ECOSYSTEMS pdf
... design and manufacture of “green” chemicals in the future Sources and Input of Organic Pollutants to the Environment 2.1 Diffusive versus Point Sources Sources of contaminants to the environment ... pathways of organic anthropogenic chemicals in ecosystems at different spatial scales, ranging from local to global with an emphasis on the use of molecular markers to study such pathways Sources of ... parts of the world today, it is important to develop techniques to quantify their fate and transport pathways It is also necessary to develop tools that can track contaminant pathways of non-POPs,...
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Tài liệu Body Size: The Structure and Function of Aquatic Ecosystems pptx
... (1.2)) In aquatic ecosystems, it is reasonable to assume that the body temperature of an ectotherm is equal to water temperature Thus, coexisting species of prokaryotes, phytoplankton, protists, ... roles of different kinds of organisms in the flux and storage of elements in ecosystems The total biomass per unit area, W, is simply the sum of the body mass of all individuals For organisms of ... but in ectotherms it tends to be of the order of 50% Consequently, rates of wholeorganism biomass production are predicted to scale according to Eq (1.2), with an allometric exponent of 3/4, the...
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Tài liệu Báo cáo khoa học: Identification of ATP-NADH kinase isozymes and their contribution to supply of NADP(H) in Saccharomyces cerevisiae docx
... kinase; it was shown to be localized in the mitochondrial matrix and to be important to several NADPH-requisite mitochondrial processes, e.g resistance to a broad range of oxidative stress, respiration, ... initiation in E coli was inserted upstream of the start codon of YEF1 (Table 5) The use of pET-DEST42 enabled us to fuse a V5 epitope and a His6 tag to the C-terminal of Yef1p E coli BL21(DE3) was transformed ... glucose-6-phosphate and phosphoTable Purification of Yef1p Total protein (mg) Cell extract DEAE–Toyopearl Butyl-Toyopearl Ni–chelate AF Toyopearl Total activity (U) Yield (%) Specific activity (UÆmg)1)...
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