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The present paper proposes the application of sodium trititanate whisker as solid sorbent for trace cadmium pre-concentration/separation using a static system coupled with flame atomic adsorption spectrometry (FAAS). The method comprised the pre-concentration of Cd(II) ions at a buffered solution (pH 5.0) onto 0.25 g of sorbent previously activated by 3.0 mol/L of HNO3. The elution step was carried...
The pulA gene enconding a thermostable pullulanase of 844 amino acids was cloned by PCR amplification from the genomic DNA of Thermotoga maritima MSB8. We successfully expressed the pulA gene in a protease-deficient strain Bacillus subtilis WB600, and the expressed pullulanase was secreted into the culture broth. Preliminary results showed that the pullulanase exhibited optimal activity at 90°C, and...
H2O2-based advanced oxidation processes (AOPs) and SO4·--based AOPs were proved novel and promising techniques in treatment of wasterwater. Microwave (MW)-assisted hydrogen peroxide (H2O2), peroxymonosulfate (PMS) and persulfate (PS) were used to dispose of COD in landfill leachate. Oxidant dosage and chloride concentration were investigated as the major operating conditions. The initial COD is 4062...
The natural zeolite was investigated as an inexpensive and effective adsorbent for the adsorption of Amido Black 10B, Acid Red and Safranine T from its queous solution respectively. The effect of parameters such as the solution of pH, contact time, the doze of the natural zeolite and the initial concentration of dye was examined. The adsorption isotherm was well fitted to both the Langmuir and Freundlich...
Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
A new analysis method of gold in sulfate leaching solution is introduced in this paper. Hydrochloric acid is added into solution to decompose thiosulfate for quickly and effectively undermining the gold thiosulfate complex. In the medium of aqua fortis, gold is adsorbed and separated by mercapto group resin. After elution, isoamyl alcohol is used as extractant to enrich and separate Au3+ from solution...
Through analyzing the influence of bio-ferric content on activated sludge performance in membrane bioreator(MBR), the results showed: sludge dehydrogenase activity ascended along with bio-ferric content augments in sludge which the influence of bio-ferric content in supernatant was similar as well; while the influence of bio-ferric content on specific oxygen uptake rate(SOUR) was contrary to that...
Under this condition of asp flooding, in order to determine the scale of asp flooding and composition, to investigate scaling mechanism, we take experimental area's scale samples to analyze. Taking the concentration data of silica and alumina ions in produced liquid to provide reference for the determination of scaling condition and the development of scale inhibitor. We study the influence of temperature...
The effect of solution temperature and the determination of the kinetic parameters of methylene blue (MB) adsorption onto cereal chaff were performed to understand the adsorption mechanism. The pseudo-second order kinetic model was fitted to the experimental data and found it was good to predict the adsorption behavior using nonlinear regressive method, suggesting that the mechanism may be a chemisorption...
A batch experiment was conducted to study the effect of pH and temperature on absorption and desorption of copper in soil, soil samples were collected from the vicinity of a copper tailings yard. The results showed that the pH value is one of the most important factors that influence the adsorption of copper. The Cu adsorption was reduced at the low pH. By increasing the pH value, the adsorption increased...
A phytase-producing strain was isolated from humous soil near the root of crops in Heilongjiang province in China. According to the morphological results by microscope and transmission electron microscope, strain No. 26-13-4 was identified as Spicaria Harting. The enzyme characteristics of Spicaria Harting phytase were studied. The optimal temperature and pH for sodium-phytate hydrolysis by Spicaria...
Microbial Flocculants is a kind of metabolic products with flocculating activity being produced by microbes and secreted outside of cells. It has the characteristics of easy degradability, highly efficiency, non-toxicity and non-secondary pollution. The flocculation mechanism of Microbial Flocculants is more complicated than the conventional flocculation theories. Through summarizing the relevant...
Large amount acid mists will be produced by the technology of Wet flue gas desulphurization (WFGD) and selective catalytic reduction (SCR) produce in the coal-fired power plant, which will cause serious corrosion of pipeline and air pollution. Experiment and pilot test efficiencies of removing acid mist from WFGD were conducted using wet electrostatic precipitators (WESP) in this work. The effect...
This paper goes up each node representative sample using PHREEQC software , on the flow line, to carry out the calculation of degree of saturation and the inverse hydrochemical simulation , the chemical type whose result shows of the study district underground water belongs to typical dissolve water. In the entire runoff process, dolomite, gypsum and halite are in not saturation state, calcite is...
Seawater substitution is one of the effective routes to alleviate the shortage of water resources, and its high saline matter can be used in printing and dyeing industry. However, the treatment of the formed dyeing wastewater is difficult for the high salt. This paper using ultraviolet (UV) light to activate persulfate (PS), hydrogen peroxide (H2O2), Oxone (PMS) to degrade azo dye Acid orange 7 (AO7)...
In this study, the kinetic mecha-nisms for the hydration process of calcium phosphate cement (CPC) containing chitosan in its liquid phase were investigated by X-ray diffraction quantitative analysis. The powder component consisted of an equimolar mixture of tetracalcium phosphate and dicalcium phosphate anhydrous. The liquid component consisted of chitosan (3 wt%), citric acid (5 wt%) and glucose...
In the present study we reported the feasibility of extracellular biopolymer (PF-9) produced by Pseudomonas fluorescence C-9 as an alternative biosorbent to remove Pb(II) metallic ions from environmental and industrial wastewater.The ability of PF-9 to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage, sorbate concentrations...
Rice husk, an agriculture byproduct, was used to adsorb congo red (CR) from aqueous solutions. Variables of the system, including contact time, pH, salt concentration, and equilibrium CR concentration, were adopted to study their effect on CR adsorption. The results showed that when the equilibrium concentration of CR increased, quantity of CR adsorption onto rice husk increased correspondingly. The...
The pretreated brown algae Laminaria japonica was used to adsorb and desorb Au2+, Ag+, Cu2+ and Ni2+ ions from electroplating wastewater in this article. The results indicated that the biosorption process of Au2+, Ag+, Cu2+ and Ni2+ ions could be divided into two steps. The first step was physical adsorption and reached equilibrium quickly, in less than 15 min. This adsorption process followed the...
The study evaluated the sorption of Zn(II) ions from aqueous solution by two low-cost materials, waste somatic and dead tea fungus. The rate and extent of accumulation were affected by pH, contact time and initial zinc ion concentration. The initial removal was rapid and equilibrium was established in less than 30 min. Good correlation coefficients were obtained when the pseudo-second-order kinetic...
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