Showing papers in "Waste Management in 2002"

TL;DR: Raw bagasse and fly ash, the waste generated in sugar mills and boilers respectively have been used as low-cost potential adsorbents for the removal of chromium and nickel from an aqueous solution to study the kinetics and extent of adsorption at equilibrium.

TL;DR: It was found that the adsorption of As(III) was exothermic, whereas As(V) adsorptive capacity can be increased by acid treatment, and this treatment causes sodalite compounds to leach out.

TL;DR: The studies showed that the palm seed coat carbon can be used as an efficient adsorbent material for the removal of phenolics from water and wastewater.

TL;DR: The results indicated that: (1) pre-sorting and baling of the waste did not hinder waste stabilization; and (2) the high organic and moisture contents resulted in an extremely strong leachates, particularly at the onset of biodegradation processes, which can affect the leachate treatment facility.

TL;DR: The ability of the algal species in removing the dye colour was dependent both on the dye concentration and algal biomass, and the dye-algal treatment mechanism was attributed to biosorption, bioconversion and biocoagulation.

TL;DR: It was determined the dye and electrode type are important on the decolorization process and the effective variables are cell voltage, electrolysis time and current density.

TL;DR: An overview of the current solid waste management situation in Singapore is presented and a brief discussion of the future challenges are provided, regarded to be the major challenges in the future.

TL;DR: The results indicated that the activated carbon made from sewage sludge had remarkable micropore and mesopore surface areas and notable adsorption capacities for phenol and carbon-tetrachloride in comparison with commercial activated carbons.

TL;DR: Governing equations for mass, momentum and heat transfer for both solid and gaseous phases in a moving bed in a solid-waste incineration furnace are described and relevant sub-models are presented.

TL;DR: The study indicated that the smaller the size of the MSW the faster the biodegradation rate of the waste, which eventually cause a reduction of the contaminant life span of the landfill and decrease in the cost of long term monitoring.

TL;DR: Leaching data showed that As was stabilised and heavy metals were immobilised in a way that the bricks were not (hazardous to soil or groundwater) neither by their use, for example, in masonry, nor afterwards, when they will be deposited as mineral demolition mass.

TL;DR: Pelletized peanut hulls could gain use as a low-cost, once-through biomass filter medium for copper-bearing waste streams due to their demonstrated ability for Cu(II) uptake and favorable structural characteristics.

TL;DR: Results show that process temperature does not seem to seriously influence the volatilisation reaction yield, at least from a quantitative point of view, while it observably influences the distribution of the volatile fraction (liquid and gas) and by-products characteristics.

TL;DR: It is suggested that a classification at waste generating sources, depending upon infection chance and/or plastic component, could be a method for the improved recycling of plastic wastes in hospitals.

TL;DR: A two-phase pilot-scale bio-fermentation system was used to evaluate the feasibility of producing methane from grass waste, a major constituent of solid wastes, and showed that 67% of the volatile solids in the waste can be converted into soluble chemical oxygen demand in a period of six months.

TL;DR: The detailed analysis of the quality of the cement product shows that there is not any significant impact of glass for the feeding rate tested and the alkaline content shows a slight increase but still within three times the standard deviation obtained from the statistical data of the past year.

TL;DR: A study on the chemical stability of municipal solid waste (MSW) bottom ash submitted to weathering was carried out in order to identify and quantify the physico-chemical maturation mechanisms in a large heap over a period of about 18 months.

TL;DR: Olive mill solid residue was used as heavy metal adsorbent material for its wide availability as agricultural waste and also for its cellulosic matrix, rich of potential metal binding active sites, to remove heavy metals from aqueous solutions with an affinity series reflecting the hydrolytic properties of the metallic ions, but also a particular affinity for copper.

TL;DR: In this paper a process for the treatment of landfill leachate involving evaporation and reverse osmosis was proposed and comparable reductions of over 97% were registered for both types of membrane in the optimal conditions of pH = 6.4.

TL;DR: The role of ettringite-type phases for the binding of oxyanions in the pH range above pH 12 has been identified before and confirmed in this work as mentioned in this paper.

TL;DR: This work investigates to what extent it is able to predict experimental data on column leaching of heavy metals from municipal solid waste incinerator (MSWI) bottom ash, using the current knowledge on processes controlling aqueous heavy metal concentrations in combination with a multicomponent reactive transport computer model.

TL;DR: This work investigated the biodegradation potential of phenol using mixed liquors of Pseudomonas putida and activated sludge and found that a second-order polynomial regression model could properly interpret the experimental data with an R2-value and F-value of 0.9997.

TL;DR: When a fly ash waste material from a copper refining process containing large amounts of As2O3 is solidified using cement and lime, the arsenic concentration in the leachate can be lowered to ca.

TL;DR: The removal of the ammonium and phosphorous from the synthetic industrial effluent by the ion exchange resins was studied, aiming at the determination of the effects of competitive ions, humic acid, pH and resin amount.

TL;DR: The addition of fly ash to sulphidic tailings, even at the lower amount, increased the pH of the drainage at values of 8.6-10.0 and decreased the dissolved concentrations of contaminants, mainly Zn and Mn, to values that meet the European regulatory limits for potable water.

TL;DR: The vitrification process was selected as the inertizing process because it permits the immobilization of the hazardous elements in the glass network and represents an environmentally acceptable method for the stabilization of this waste.

TL;DR: This study investigates the possibility of recovering nickel from the spent catalyst (NiO/Al2O3) resulting from the steam reforming process to produce water gas (H2/H2O) in many industries.

TL;DR: The experimental results pointed out the ability of the used strain to maintain the environment, that initially has a pH about 8, at strongly acid conditions (pH 2.5-3.5), producing sulphuric acid that is the chemical agent responsible for the metals solubilisation.

TL;DR: It was found that for mixed sodium dodecylsulfate (SDS)/Triton X-100 surfactants, the critical micelle concentration was significantly lower than that of SDS and mixed micelles formed, which suggests that the rejection of Cu2+ was due to the electrostatic attraction betweenCu2+ and SDS.

TL;DR: The research presented here was carried out to examine how the phenomena of carbonation during drying influence the release of inorganic contaminants from Portland cement-based materials during cyclic wetting and storage.