30 Articles found
IOS Press Articles
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Changes of Cu, Zn, and Cd speciation in sewage sludge during composting
The potential toxicity risks from heavy metals depend on their chemical speciation. The four stages of the Tessier sequential extraction method were employed to investigate changes in heavy metal speciation (Cu, Zn, and Cd) of sewage sludge during ...
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Sorption of pyrene on two paddy soils and their particle-size fractions
In the present study, the sorption of pyrene on two kinds of bulk paddy soils, Gleyic Stagnic Anthrosols, and Ferric accumulic Stagnic Anthrosols as well as their particle-size fractions was investigated. The sorption isotherms fitted well with ...
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Characteristics of PM2.5 in rural areas of southern Jiangsu Province, China
To understand pollution level and possible sources ofatmospheric fine particulates in rural areas of southern Jiangsu Province of China, samples of PM2.5 were collected and analyzed in Xueyan Town and Taihu Lake Station over three seasons from July ...
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Estimation of OCDD degradation rate in soil
The current concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were determined in soils contaminated with Chinese technical product sodium pentachlorophenate (Na-PCP). The estimated half-life of octachlorodioxin (OCDD) ...
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Decolorization of azo dyes with high salt concentration by salt-tolerant mixed cultures under anaerobic conditions
Because the lack of detailed study of biological decolorization in high salt dye wastewater, it is still difficult to evaluate the biological treatment on high-salinity dye wastewater. The experiments were carried out to study the salt-tolerant ...
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Distribution characteristics of ammonia-oxidizing bacteria in the Typha latifolia constructed wetlands using fluorescent in situ hybridization (FISH)
A molecular biology method, fluorescent in situ hybridization (FISH), in which the pre-treatment was improved in allusion to the media of the constructed wetlands (CW), e.g. the soil and the grit, was used to investigate the vertical distribution ...
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Adsorption of dyes onto activated carbon prepared from olive stones
Activated carbon was produced from olive stones (OSAC) by a physical process in two steps. The adsorption character of this activated carbon was tested on three colour dyes molecules in aqueous solution: Methylene blue(MB), Rhodamine B (RB) and ...
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Photodegradation of nitroaromatic compounds in aqueous solutions in the UV/H2O2 process
Photodegradation of nitrobenzene and nitrophenols in aqueous solutions by means of UV/H2O2 process was studied in the Rayox batch reactors. Three nitrophenol isomers were identified as main photoproducts in the irradiated NB aqueous solutions. The ...
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Enhanced biological nutrients removal using an integrated oxidation ditch with vertical circle from wastewater by adding an anaerobic column
Compared to conventional oxidation ditches, an integrated oxidation ditch with vertical circle (IODVC) has the characters of concise configuration, simple operation and maintenance, land saving and automatical sludge returning. By the utilization of ...
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A 50-years record of dichloro-diphenyl-trichloroethanes and hexachloro-cyclohexanes in lake sediments and penguin droppings on King George Island, Maritime Antarctic
Since the ban on the use of organochlorine pesticides (OCPs) such as dichloro-diphenyl-trichloroethane (DDT) and hexachlorocyclohexane (HCH) in agriculture, their levels have generally dropped. In a number of cases, however, the levels of these OCPs ...
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Sedimentation of short cylindrical pollutants with mechanical contacts
Lattice Boltzmann method and elastic particle collision model were used to investigate the sedimentation of short cylindrical pollutant particles with mechanical contacts for varying bulk number density ε and terminal Reynolds number ReT. The ...
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Size distribution of the secondary organic aerosol particles from the photooxidation of toluene
In a smog chamber, the photooxidation of toluene was initiated by hydroxyl radical (OH·) under different experimental conditions. The size distribution of secondary organic aerosol (SOA) particles from the above reaction was measured using ...
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On-line optical determination of floc size of Fe(III) coagulants
This study investigated the floc aggregation, average floc size, floc size variance and floc growth velocity when ferric chloride (FeCl3) and polyferric chloride (PFC) were used to treat the simulated water samples. The factors including coagulant ...
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Mechanistic study of ozonation of p-nitrophenol in aqueous solution
Ozonlysis in the treatment of p-nitrophenol solution was studied in this paper. The results indicated that the decomposition of p-nitrophenol was accelerated as the gas flow rate or pH value increased. When gaseous ozone concentration was 20.11 mg/L ...
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A novel fiber coating for solid phase microextraction and its application for the extraction of n-alkane from aqueous sample
Base on the previous work in laboratory, a novel polyaniline doped with polydimethylsiloxane coating was developed on a stainless steel wire for solid phase microextraction (SPME) by electroplating method. This electroplating method not only has ...
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Degradation kinetics and products of triazophos in intertidal sediment
This work presents laboratory studies on the degradation of triazophos in intertidal sediment. The overall degradations were found to follow the first-order decay model. After being incubated for 6 d, the percentage of degradations of triazophos in ...
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Influence of phosphorus on Microcystis growth and the changes of other environmental factors
The growth processes of Microcystis aeruginosa (FACHB-41) in simulated Taihu Lake water with different phosphorus concentrations were investigated using laboratory microcosms. The algal biomass increased with the increase of phosphorus concentration ...
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Fulvic acid degradation using nanoparticle TiO2 in a submerged membrane photocatalysis reactor
The degradation of fulvic acid (FA) by nanoparticle TiO2 in a submerged membrane photocatalysis (SMPC) reactor was studied. In this reactor, photocatalytic oxidation and membrane separation co-occured. The continuous air supplier provided O2 for the ...
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Application of Bayesian regularized BP neural network model for analysis of aquatic ecological data - A case study of chlorophyll-a prediction in Nanzui water area of Dongting Lake
Bayesian regularized BP neural network (BRBPNN) technique was applied in the chlorophyll-a prediction of Nanzui water area in Dongting Lake. Through BP network interpolation method, the input and output samples of the network were obtained. After ...
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Risk assessment of heavy metal contaminated soil in the vicinity of a lead/zinc mine
Heavy metal contamination of soils through anthropogenic activities is a widespread and serious problem confronting scientists and regulators throughout the world. In this study we investigated the distribution, chemical species and availability of ...