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This study focused on the characteristics of the removal of Cr(VI)(Cr6+) from wastewater with fly ashes (FAs), a by-product from coal-fired electric power plants. The influences of NaCl dose, pH, agitated time and fly ash (FA) dose (the temperature is 50°Cin the test) were investigated in batch experiments, and the removal of Cr6+ and sorption capacity with modified fly ashes (MFAs) were compared...
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...
Biosorption of organic pollutants, expressed as COD, by aerobic and anaerobic sludge was conducted to examine equilibrium and kinetic models. Freundlich and Langmuir models were mostly used for mathematical description of the biosorption equilibrium. Freundlich equation was more fit to describe the equilibrium of biosorption process in this study. Under the same experimental condition, biosorptive...
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...
The lack of knowledge about water flow and particle behavior of the grit chamber with rotational flow remains a significant difficulty for the design of these work in sandstone wastewater of hydropower station. In the paper, Eulerian-Lagrangian multi-phase model is set up. The grit chamber with rotational flow in the powerhouse, which is located in southwest of China, is as a case. Velocity field...
The paper investigated the treatment effect of modified rice husk as an adsorbent on wastewater containing Zn(II). Langmuir and Freundlich equations quantified the Zn(II) removal effect of modified rice husk. We analyzed characteristics of adsorption kinetics, the initial pH value, temperature effect on adsorption process, and compared with the regeneration efficiency of adsorbent. The results showed...
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...
This study attempted to find the adsorption law of fly ash to COD in domestic sewerage. After the elementary characterization of fly ash was described, the influence of contact time, sorbent concentration, and different pretreatment ways of fly ash, initial COD concentration and temperature on the adsorption process was investigated. Results showed adsorption equilibrium attained within 120 min time...
The phosphate removal potential of steel slag modified by high temperature activation has been investigated. The effects of adsorbent dose, pH, contact time and initial phosphate concentration on the phosphate adsorption by modified steel slag have been studied. Phosphate removal was seen to increase with increasing adsorbent dose, contact time and decreased with increasing initial phosphate, while...
The sludge carbon made from sewage sludge with ZnCl2 are used for gatifloxacin adsorption. Characterizing sludge carbon and researching mechanism of gatifloxacin adsorption on different adsorbents. The results showed: sludge carbon have large surface area and mid-hole structure. The adsorption keep to second kinetics model, that means chemical adsorption is the main progress. The research proves sludge...
Mainly containing organic materials, the printing and dyeing wastewater is a kind of industrial pollution with complex composition and high colority, which is difficult to be treated. With the large volume of new auxiliary and slurry applied to the modern textile industry, the biodegradability rate of organic pollution decreased and it is more difficult to be treatment. Comprehensively considered...
In photochemical reactor, the process conditions of formaldehyde wastewater treatment using UV-Fenton oxidation under the joint action of hydrogen peroxide, ferrous ions, and ultraviolet were studied, and the kinetic curves of formaldehyde degradation in different conditions were obtained. The results showed that: when the original wastewater concentration is 30mg/L, operating temperature is 23 °C,...
The bio-hydrogen producing process has complex interactions; thus, constructing a detailed mechanistic model and proper control architecture is difficult. Artificial neural networks (ANNs) are capable of inferring the complex relationships between input and output process variables without a detailed characterization of the mechanisms governing the process. This work presented a novel ANN that accurately...
A two-fluid model was adopted to simulate the three-dimensional gas-liquid flow in an aeration tank. The different operation parameters of aeration tank were simulated with the model, and the gas-liquid flow behavior in aeration tank was analyzed. The simulation results agree qualitatively with the operating conditions in literature and actual plant. Application of the model was demonstrated by analyzing...
In the dissertation, the treatment of chromium containing wastewater using sawdust which is a low-cost biosorbent. The influences of physical and chemical parameters such as pH value, reaction time and temperature and the initial concentration of metallic ion on the adsorption process were investigated by batch adsorption. When the pH value 6, reaction temperature 323 K, dosage of sawdust 6 g/L, the...
The removal of Cu2+ and Cd2+ of aqueous solution by residual sludge from four type sewage treatment plant was investigated. Effect of adsorption time, kinetics and thermodynamics of adsorption was researched. The study indicated that all of the sludge can absorb mono-component Cu2+ or Cd2+ but the sludge from Petrochemical Wastewater plant had deposition rather than adsorption on Cu2+ or Cd2+. The...
The fly ash is the vice- outcome of the coal combustion, it results pollution of the environment. The possibility of the fly ash removing color in water was studied in this text. Through experiment text of removal color in methylic orange waste water by front and back character modified of the fly ash, the mechanism was discussed. The influent density of dosing quantity, respond time, respond temperature,...
Perfluorooctane sulfonate (PFOS) has increasingly attracted global concerns in recent years and has also been proposed as the candidates of persistent organic pollutants due to their world-wide distribution, environmental persistence and bioaccumulation potential. The adsorption mechanism of PFOS from aqueous solutions onto granular activated carbon (GAC) was investigated. The adsorption reaction...
BTEA-Bentonite by intercalation of surfactant benzyltriethylammonium (BTEA) was described. Product was characterized by XRD and IR techniques. The adsorption properties of BTEA-Bentonite for Crystal violet is investigated, and the results show that the sorption isotherms fit the Freundlich model very well. The adsorption process of Crystal violet onto BTEA-bentonite was spontaneous, endothermic physisorption...
The purpose of this work was to investigate the kinetics of the adsorption and biodegradation process in adsorption-biodegradation anaerobic sequencing batch reactor (AB-ASBR). Using the whole milk powder as substrate, the volume loading rate (VLR) of influent was 7.0kgCOD / (m3 · d) at 35°C. In order to maintain the optimal pH value, NaHCO3 was added into the influent. The experiment indicated that...
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