This study aimed to produce acetic acid from vegetable wastes by a new hydrothermal two-step process. A continuous flow reaction system with a maximum treatment capacity of 2 kg/h of dry biomass developed by us was us...
This study aimed to produce acetic acid from vegetable wastes by a new hydrothermal two-step process. A continuous flow reaction system with a maximum treatment capacity of 2 kg/h of dry biomass developed by us was used. Five kinds of vegetables of carrots, white radish, chinese cabbage, cabbage and potato were selected as the representation of vegetable wastes. First, batch experiments with the selected vegetables were performed under the condition of 300°C, 1 min for the first step, and 300°C, 1 min and 70% oxygen supply for the second step, which is the optimum condition for producing acetic acid in the case of using starch as test material. The highest yields of acetic acid from five vegetables were almost the same as those obtained from starch. Subsequently, similar the highest yield of acetic acid and experimental conditions from vegetables were also obtained successfully using the continuous flow reaction system. These results should be useful for developing an industrial scale process.
A new di-function adsorbent (JN-3) was prepared by sulfhydryl modified. Comparing with Amberlite XAD-4 and NDA-150, the equilibrium adsorption for phenol on the JN-3 from aqueous solutions was tested, perfect adsorpti...
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A new di-function adsorbent (JN-3) was prepared by sulfhydryl modified. Comparing with Amberlite XAD-4 and NDA-150, the equilibrium adsorption for phenol on the JN-3 from aqueous solutions was tested, perfect adsorption capacity was shown. Pb2+ can be also removed by JN-3 because of the chelate interaction between sulfhydryl groups and metal ions. This adsorbent could be used in removal of combine pollutants such as phenolic compounds and heavy metal ions from waste streams.
The photochemical degradation of bisphenol A(BPA)was studied in the presence of natural humic sub stances from different origins under simulated solar *** underwent insignificant direct photolysis in neutral water,but...
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The photochemical degradation of bisphenol A(BPA)was studied in the presence of natural humic sub stances from different origins under simulated solar *** underwent insignificant direct photolysis in neutral water,but rapid photosensitized degradation in four humic substances solutions via pseudo-first-order reaction *** photo-degradation rate of BPA was insensitive to the different initial BPA concentrations and was inhibited in aerated solution compared with the deoxygenated *** reactive oxy-gen species(ROS)such as·OH and 1O2 produced from excita-tion of humic substances under irradiation was determined from the quenching kinetic experiment using molecular *** five main intermediate photoproducts of BPA in Nordic lake fulvic acid(NOFA)were tentatively identified using gas chromatography/mass spectrometer(GC/MS).Based on the identification of ROS and the analysis of photoproduct formation,the possible phototransformation pathways of BPA were proposed,involving the direct pho-tolysis due to the energy transfer from the triplet state humic substance(3HS*)to BPA molecules and hydroxyl radical addition and oxidation as well.
Iron promoted electrolysis technique was adopted to treat the landfill leachate and the influence of FeSO4 concentration, initial pH value and electrolytic current (electrolytic voltage) on the removal of contaminants...
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Iron promoted electrolysis technique was adopted to treat the landfill leachate and the influence of FeSO4 concentration, initial pH value and electrolytic current (electrolytic voltage) on the removal of contaminants was inspected. The iron promoted electrolysis enhanced markedly the removal efficiency of contaminant, compared with the traditional electrolysis oxidation degradation of organism. The greater the FeSO4 concentration, the higher the removal effect of organism;the reasonable initial pH value of electrolysis medium was 3.0 [similar to] 4.0;the removal efficiencies of leachates CODCr and NH3-N by iron promoted electrolysis were 68.37 % and 89.07% respectively, and the removal efficiency of color and turbidity exceeded 98%.
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