chemistry of soil organic matter

... factors 177 Optimum level of soil organic matter 184 Effects of management on soil organic matter 185 XI1 CONTENTS Effect of long term cropping 185 Effect of cropping methods and ... 273 Sources of sulfur 273 Nature and distribution of organic sulfur in soil 275 Forms of organic sulfur 276 Amount and distribution of organic sulfur 278 Effect of soil forming ... of events appears to be HA -, FA. EXTRACTION OF HUMIC SUBSTANCES The organic matter content of soils may range from less than 0.1% in desert soils to close to 100.0% in organic soils....

Effect of dissolved organic matter (DOM) and biofilm on the adsorption capacity of powdered activated carbon in activated sludge

... amount of organic carbon was indicator as the amount of biofilm developed on PAC. Figure 5 shows the amount of organic carbon on PAC after each incubation. Figure 6 shows the adsorption isotherm of ... Abstract The objective of this study is to clarify the effect of DOM and biofilm on the adsorption capacity of PAC in the aeration tank of PACT process. The adsorption capacity of PAC for 3,5-DCP ... 248 - capacity of PAC in bioreactors such as aeration tank might be caused by the adsorption of the metabolites of microorganisms, other dissolved organic matters (DOM) and biofilm attached...

Removal of Nutrients, Organic Matter and Heavy Metals from Paddy Field Drainage by Charcoal

... the portion of inlet and outlet and at the boundary of nylon nets bags with charcoal, and is adsorption when drainage water contacts the surface of charcoal because of the structure of this equipment. ... during a contact time of more than one hour. The reduction rates of TOC and TN ranged from 20 % to 40 %. The reduction rate of TP ranged from 20 % to 90 %. The reduction rates of metals (Cr, Fe, ... recalcitrant organic matter derived from the leaves and stems of plants, which is known to increase chemical oxygen demand (COD) in lakes. The average biochemical oxygen demand concentration (BOD) of...

Biological Alteration of Zinc Complexation Characteristics of Dissolved Organic Matter in Domestic Wastewater Treatment Plant Effluent under River Water Environment

... dissolved organic matter, river water, wastewater treatment plant effluent, zinc complexation. INTRODUCTION AND BACKGROUND Dissolved organic matter (DOM) is important in the transport of metals ... Characteristics of DOM in Different Urban Wastewaters, Water Sci. and Technol., (in press). Cheng T. and Allen H. E. (2006). Comparison of zinc complexation properties of dissolved natural organic matter ... surface waters, Journal of Environmental Management, 80, 222-229. Ma H., Allen H. E. and Yin Y. (2001). Characterization of isolated fractions of dissolved organic matter from natural waters...

Influence of Phosphorus Concentration on the Biodegradation of Dissolved Organic Matter in Lake Biwa, Japan

... ABSTRACT The influence of phosphorus concentration on the biodegradation of dissolved organic matter (DOM) was discussed as a possible cause of the accumulation of chemical oxygen demand ... Japan. It has a surface area of 674 km2, a volume of 27.5 km3, a maximum depth of 104 m, a mean depth of 41 m, a catchment area of 3,174 km2 and a residence time of 5.5 years (International ... 2008). As Matsui (1975) reported that particulate organic matter did not affect CODMn, the possibility of accumulation of dissolved organic matter (DOM) is pointed out (Imai, 2002). On the...

Controls of bioavailability and biodegradability of dissolved organic matter in soils

... andfractions of organic carbon in air-dried and field-moist soils. Soil Biol. Biochem. 20, 737 – 741.Blaser, P., 1994. The role of natural organic matter in the dynamics of metals in forest soils. ... degradation of organic matter by microorganisms, then DOM should play akey role in the stabilisation and destabilisation of soil organic matter, and thus, in Cdynamics and C pools of soils. Sollins ... March 2002; accepted 9 December 2002AbstractIn soils, dissolved organic matter (DOM) is probably the most bioavailable fraction of soil organic matter, since all microbial uptake mechanisms require...

$Correlation of the partitioning of dissolved organic matter fractions with the desorption of cd$

Correlation of the partitioning of dissolved organic matter fractions with the desorption of cd

... Sorption of natural dissolved organic matter on soil. Chemo-sphere 1999;38:1505 –15.Spark KM, Wells JD, Johnson BB. Characteristics of the sorption of humicacid by soil minerals. Aust J Soil Res ... humified organic matter. J Soil Sci 1980;31:633 –41.Sauve S, Hendershot W, Allen HE. Solid-solution partitioning of metals incontaminated soils: dependence on pH, total metal burden, and organic matter. ... BB. Sorption of heavy metals by mineral–humic acid substrates. Aust J Soil Res 1997b;35:113– 22.Strawn DG, Sparks DL. Effects of soil organic matter on the kinetics andmechanisms of Pb(II) sorption...

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Effects of cattle and poultry manures on organic matter content and adsorption complex of a sandy soil under cassava cultivation (Manihot esculenta, Crantz) doc

... concentrations of the organic matter. The increase in the organic matter induced by the amendment is due to the manures which has three roles of organic matter sources, of protection of the soil against ... (control) Soil + cM Soil + pM02468101214161820 Number of earthwormsTreatments Figure 1. Average number of earthworms at 0 - 55 cm soil layers in one m2 of the sandy soil under ... 54 . 0 Organic matter content (%)S o il l a y e r s ( c m ) n M c M p M Figure 2. Responses in soil organic matter content at 0 - 22 and 22 - 55 cm soil layers in the sandy soil under...

Leaching of arsenic in response to organic matter contamination in groundwater treatment practice

... the scope of this sorption is highly influenced by the presence of organic matter. Ligand exchange-surface complexation, between carboxyl/hydroxyl functional groups of organic matter and metal ... days. The microbial decomposition of organic matter would most likely happen in the inoperative condition of the AIRU. In the biodegradation process of organic matter, the aerobic oxidation is ... the arsenic removal efficiency depending on the types and concentrations of the organic matters. The impact of organic matter contamination on the arsenic removal efficiency was almost immediate...

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