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The biosorption of reactive red on acid-treated Penicilium sp. was investigated in a packed-bed column. The column experiments were conducted to study the effect of operating parameters such as initial dye concentration, adsorbent dose and flow rate on the column removal capacity. The Thomas model was used to analyze the experimental data. Column experiments showed that the fungal mycelia mixed with...
2-methylisoborneol (MIB) and geosmin cannot readily be removed by conventional water treatments. Ozonation biological activated carbon (O3-BAC) process is an attractive option for MIB and geosmin removal. For MIB and geosmin with an initial concentration of 500 ng/L, the removal efficiencies of MIB (geosmin) by ozonation, biodegradation and activated carbon adsorption were 51% (73%), 19% (17%) and...
The montmorillonite was modified by AlCl3 and was used to remove the fluorine in the drinking water. The factors of influencing the fluorine removal rate, including the concentration of AlCl3 and the mass of the adsorbent, was studied in the research. The fluorine removal percentage was 97% by 10 g/L modified montmorillonite in the 10 mg/L fluorine solution at pH7, 25+2°C. The results suggest that...
In this study, a series of batch experiments were conducted to investigate the phosphorus (P) adsorption properties of alum sludge dried at 100°C (AS100) and activated at 300 (AS300), 500 (AS500) and 900°C (AS900). In the adsorption test, the adsorption isotherms, kinetics, pH and temperature effect were examined. The results indicated that the Langmuir adsorption isotherm is fit for the description...
A new kind of material for oil adsorption was prepared by melt blend with EPDM as the matrix and MgO as the filler. The effects of Dicumyl peroxide (DCP) and MgO contents on the oil absorbency were studied. Comparing the two samples with the highest oil adsorption rates, the experimental result indicates that the oil absorbency of EPDM (cross linked) is 51% more than that of EPDM the oil absorbency...
A study was conducted on the adsorption kinetics of diuron from aqueous solutions onto activated carbon fiber. The results showed that the formation of hydrogen bonds between diuron and water, and temperature variations may possibly affect the adsorption process. Furthermore, adsorption of diuron onto activated carbon fiber was affected remarkably by solution pH and the maximum adsorption amount was...
The ammonia nitrogen and phosphorus adsorption on natural zeolite were studied. Experimental data shows, the Freundlich and Langmuir models agrees very well with experimental data on ammonium and phosphorus, respectively ; Zeolite adsorption of ammonia nitrogen and phosphorus removal process should follow the secondary dynamic equation; In certain concentration range of ammonia nitrogen, zeolite and...
To find an effective method for uranium(VI) adsorption, uranium(VI) ion-imprinted chitosan composite magnetic microsphers (U(VI)-ICCMM) were synthesized using uranium(VI) as template, chitosan as functional monomer, epichlorohydrin and glutaraldehyde as crosslinking agents. Magnetic chitosan microsphers (MCM) were synthesized without U(VI) ion-imprinted as control. Experiments were conducted in a...
The ammonia nitrogen and phosphorus adsorption on natural zeolite were studied. Experimental data shows, the Freundlich and Langmuir models agrees very well with experimental data on ammonium and phosphorus, respectively; Zeolite adsorption of ammonia nitrogen and phosphorus removal process should follow the secondary dynamic equation; In certain concentration range of ammonia nitrogen, zeolite and...
A new method for Nitrate-N removal in water has been presented in this paper, and related experiments have been carried out to study its technical characteristics. Results showed that in designed electrolysis system, Fe modified Ti substrate cathode can catalytic reduce NO3--N to NH4+-N under suitable conditions. Furthermore NH4+-N can be oxidized to N2-N in same system by supporting of Cl-. Under...
The zeolite was used to treat the groundwater. The various solutions with initial manganese (Mn2+) concentration ranging from 0.5 to 1.5mg/L were prepared in this study. The nature zeolite has cation-exchange capacity and higher absorption capacity for Mn2+ from ground water with 1.89 and 2.69 mg/g at 288 and 298K. Adsorption date were well described by the Langmuir model and the thermodynamic constants...
Adsorptive effects of natural clinoptilolite (NC), HDTMA-modified natural clinoptilolite (HMNC) and CPB-modified natural clinoptilolite (CMNC) were assessed for the removal of Cr(VI) from water using stirring method. Subsequently, the surface characteristics of this three materials were analyzed by XRD and IR. Selectivity series deduced from removal effect of Cr(VI) were CMNC > HMNC > NC, and...
In this paper the natural zeolite from the Sakhaptinsk deposit (Krasnoyarsk Territory) was tested as adsorbent for removal of Fe2+, Fe3+, Mn2+, Ca2+, NH4+ from aqueous solutions and well water of Kozhevnikovsky District (Tomsk Region) under dynamic conditions. The physico-chemical and adsorption properties of the zeolite were studied by XRD, TGA, DTA, FTIR spectroscopy, SEM, chemical analyses. It...
TiO2 is the most frequently employed photocatalyst in realising complete mineralization of organic pollutants in water treatment. Its large bandgap energy necessitates though UV excitation to induce charge separation within the particle. Nitrogen doped into substitutional sites of TiO2 has shown bandgap narrowing and photocatalytic activity in the visible light. N-doped and non-doped mesoporous titania...
This study was aimed to model and optimize the adsorption process of cadmium from aqueous solution onto raw rice husk (RRH). The batch experiment was carried out in four factors as a function of pH (A: 5 - 9), adsorbent dosage (B: 2 - 8 g/100 ml), contact time (C: 60 - 240 minutes) and initial concentration of adsorbate (D: 70 - 110 mg/L) to response (percentage of cadmium removal). Response surface...
The powder activated carbon (PAC) is used as adsorbents to study the adsorption performance of humic acid (HA) in aqueous solutions. The adsorption capacity of HA onto PAC increased with HA initial concentration, and decreased with pH and temperature, The maximum adsorbed amounts of HA onto PAC calculated by the Langmuir model at 25°C is 33.898 mg/g, according to Langmuir isotherm model, The n value...
In order to evaluate the effects of heavy metals discharged in the use of fossil energy sources on the environment, a novel method using a microcolumn packed with single-walled carbon nanotubes (SWNTs) as a new adsorption material was developed for the preconcentration of trace Pb in environmental water sample prior to its monitoring by inductively coupled plasma mass spectrometry (ICP-MS). The adsorption...
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...
Methyl tert-butyl ether (MTBE) is a common additive for producing a clean burning fuel with a higher Octane number and less emissions. Batch adsorptive capacity, continuous flow breakthrough and biological activated carbon (BAC) treatment experiments were conducted to compare the adsorptive capacities of four activated carbons for MTBE, to obtain the adsorptive capacity indicators useful for predicting...
Polymer Si-Fe (PSF) coagulant was prepared by co-polymerization. The oxidization of PSF was investigated by using jar test for humic acid (HA) solution sample and measuring oxidization-reduction potential (ORP) compared with that of polyferric aluminum (PFA). The results show that PSF has higher ORP value than PFA, with the difference of 420mV. PSF is an oxidization coagulant that possibly changes...
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