Showing papers in "Water Research in 2000"

TL;DR: In this paper, a pseudo-second order rate equation describing the kinetics of sorption of divalent metal ions onto sphagnum moss peat at different initial metal ion concentrations and peat doses has been developed.

TL;DR: A set of quantitative analytical data from the alluvial aquifer of the Pisuerga river, located at the north-east of Valladolid (Spain), has been processed by multivariate statistical techniques in order to investigate the evolution of the groundwater composition between two surveys as mentioned in this paper.

TL;DR: In this paper, the authors provide a general description of the occurrence of arsenic in the environment, its toxicity, health hazards, and measurement techniques for speciation analysis, viz., spectrometric, chromatographic, electrochemical, etc.

TL;DR: The removal efficiency of activated carbon Filtrasorb 400 (F-400) towards three highly used reactive dyes in the textile industry was investigated in this article, where the adsorption capacity data showed a high removal ability for the three reactive dye and a distinguished ability for R. Yellow.

TL;DR: Peat has been investigated by several researchers as a sorbent for the capture of dissolved metals from wastestreams as mentioned in this paper, and the mechanism of metal ion binding to peat remains a controversial area with ion exchange, complexation, and surface adsorption being the prevalent theories.

TL;DR: The usefulness of water quality indices (WQI) to assess the water quality from multiple measured parameters, and to evaluate spatial and temporal changes, is verified and could be of particular interest for developing countries.

TL;DR: In this article, the effects of silicate, sulfate, and carbonate on the removal of arsenite [As(III)] and arsenate [As (V)] by coprecipitation with ferric chloride were studied.

TL;DR: In this article, seven azo dyes were photocatalytically degraded in TiO 2 suspension and their degradation rates were compared with disappearance and TOC elimination rates, and it was demonstrated that diazo dye is less degradable than monoazo and the order of photocatallytic degradation rates was in approximate agreement with that of ozonation rates cited from literature.

TL;DR: In this article, the amount of the organic substances removed by oxidation and coagulation in treatment of the non-biodegradable landfill leachate by Fenton's reagents was analyzed.

TL;DR: In this article, the amount of potentially mobile phosphorus (P) in Lake Erken sediments was determined by P release experiments, and forms of mobile P were identified by P fractionation.

TL;DR: In this article, the characteristics of pollutants overflow on storm events, relationships between pollutant load and runoff, and the first flush effect in urban areas were investigated in Taejon and Chongju, Korea.

TL;DR: In this paper, the authors used ozone and ozone/hydrogen peroxide (advanced oxidation process) to degrade the pharmaceuticals and showed that ozone and hydrogen peroxide leading to OH-radical formation improved the degradation efficiency of all investigated compounds.

TL;DR: In this paper, the authors studied the mineralization process for 2,4-dichlorophenoxyacetic acid (2,4D) at pH ca. 3 by advanced electrochemical oxidation processes (AEOPs), such as electro-Fenton and photo-electro-fenton processes, in which a Pt anode and a carbon-polytetrafluoroethylene O2-fed cathode are used.

TL;DR: In this article, the metal ion sorption obeyed both the Langmuir and Freundlich isotherms, and the binding capacities and affinities observed were consistent with the HSAB theory on hard and soft acid base.

TL;DR: This note addresses tubewell contamination in groundwater and health-related impacts in Bangladesh and presents the subsurface occurrence of arsenic and the reason of contamination.

TL;DR: In this paper, six different species of non-living Sargassum biomass were compared on the basis of their equilibrium Cd and Cu uptake in order to evaluate potential variability in the sorption performance of different Sargasum species.

TL;DR: In this article, various currently used chemical oxidation processes (AOPs) for pesticide elimination from wastewater are reported, including Heterogeneous TiO 2 photocatalysis, ozonation and photo-Fenton's reagent.

TL;DR: The effect of the sludge retention time (SRT) between 3 and 15 days, on hydrolysis, acidification and methanogenesis of domestic sewage was researched by simulating aSludge bed segment of an upflow anaerobic sludge bed (UASB) system as a completely stirred tank reactor (CSTR).

TL;DR: In this paper, the causes of fouling were determined for microfiltration of a surface water through a polypropylene hollow-fibre membrane, and the major contribution to fouling was attributed to the NOM fraction comprising small, neutral, hydrophilic compounds.

TL;DR: In this article, the reduction of azo dyes by zero-valent iron metal (Fe0) at pH 7.0 in 10mM HEPES buffer was studied in aqueous, anaerobic batch systems.

TL;DR: In this article, a two-resistance mass transfer model has been developed based on the film resistance and homogeneous solid phase diffusion to estimate the theoretical concentration-time dependent curves and to compare them with the experimental curves by means of the best-fit approach.

TL;DR: In this paper, the removal of nitrogen in the form of ammonium ions (N-NH+4) from aqueous solutions using natural clay and zeolite was investigated.

TL;DR: In this paper, the effect of shear on the steady-state floc size was investigated and the median flee size was found to increase until an equilibrium between the rates of aggregation and breakage was reached.

TL;DR: In this article, the effect of radical scavengers such as bicarbonate and tert-butanol on the Mn II catalysed ozonation of atrazine, an important herbicide and well-established radical probe substance, was studied using a conventional gas bubble-contacting column.

TL;DR: In this article, surface coatings (biofilms and associated minerals) were collected on glass slides in the oxic surface waters of Cayuga Lake (New York State, U.S.A.).

TL;DR: In this article, the feasibility of pre-treatment of brown seaweeds to develop a better biosorbent was evaluated by its performance, the degree of its component leaching (measured by the weight loss and TOC) as well as by the number of ion-exchange sites remaining in the biomass after the pretreatment.

TL;DR: In this paper, enhanced coagulation (coagulation optimized for removal of dissolved organic material as well as particles) was used to improve DOC removal from the current average of 29% to an average of 43% at 10 sites tested.

TL;DR: A quantitative investigation of their respective inhibitory effects showed that gallic and pyrogallic acids are more inhibitory than (+)-catechin and ellagic acid, and that the autoxidized products of each polyphenol demonstrated growth inhibition.

TL;DR: Magnesium chloride has been used as a coagulant to investigate the eAectiveness in the chemical precipitation method for the removal of colouring matters as mentioned in this paper, and the results show that MgCl2 is capable of removing more than 90% of the colouring material at a pH of 11 and a dose of 4 g MgCL2/l of dye solution.

TL;DR: In this article, a detailed experimental and theoretical analysis of the adsorption process of mercury by ion exchange resins is presented, and the results confirm previous results and justify the great interest for the application of ion exchange materials in water treatment plants.