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Lin H.,University of Science and Technology Beijing | Wang Q.,University of Science and Technology Beijing | Wang Q.,Beijing Key Laboratory on Resource Oriented Treatment of Industrial Pollutants | Wang L.,Shanxi Academy of Environmental science | And 2 more authors.
Huagong Xuebao/CIESC Journal | Year: 2014

A series of factors were examined in the separation of lactic acid (HLa) from lees fermentation by bipolar membrane electrodialysis. When the fermentation with the initial HLa concentration of 13.5 g·L-1 was treated by bipolar membrane electrodialysis under the conditions of voltage 27 V, feeding concentration ratio 1.3, and flow rate 20 L·h-1 for 10 h, HLa concentration of discharging tank was 20.95 g·L-1, which was 1.6 times the initial concentration, a significant concentrated effect. Moreover, the analysis of acid ion migration shows that immigration rate of lactic acid ions is significantly higher than that of other acid ions. The relative separation efficiency of HLa to propionate and acetic acid are lower. ©, 2014, Chemical Industry Press. All right reserved. Source


Gao Z.,University of Science and Technology Beijing | Ma Y.,Nanyang Technological University | Wang Q.,University of Science and Technology Beijing | Wang Q.,Beijing Key Laboratory on Resource Oriented Treatment of Industrial Pollutants | And 3 more authors.
Bioresource Technology | Year: 2016

Crude glycerol (byproduct of biodiesel preparation) was utilised as the carbon source to produce lipid using oleaginous yeast Rhodosporidium toruloides 32489. Under the same conditions, lipid production with crude glycerol was higher than those produced with glucose and pure glycerol. The effects of 4 main impurities in crude glycerol (methyl oleate, sodium oleate, NaCl and methanol) on lipid production were investigated. Compared with utilising pure glycerol, addition of methyl oleate, sodium oleate, and NaCl impurities increased lipid production by 47.0%, 68.0% and 64.0%, respectively, while methanol decreased lipid production by 17.7%. However, when methanol was mixed with other impurities, its inhibition effect was alleviated due to the promoting effect of other impurities. Hence, crude glycerol could be used as a renewable and low-cost carbon source to replace pure glucose or glycerol for lipid preparation. © 2016 Elsevier Ltd Source


Ma Y.,University of Science and Technology Beijing | Wang Q.,University of Science and Technology Beijing | Wang Q.,Beijing Key Laboratory on Resource Oriented Treatment of Industrial Pollutants | Zheng L.,University of Science and Technology Beijing | And 4 more authors.
Energy | Year: 2015

In this study, we produced biodiesel by utilising waste cooking oil as a raw material, unrefined methanol produced by a chemical plant as a transesterification agent and sodium hydroxide as a catalyst. The yield and heating value of the biodiesel produced with unrefined methanol were respectively 1.09% and 0.23MJ/kg higher than those of the biodiesel prepared with pure methanol. The biodiesel characteristics met the standard of the ASTM (American Society for Testing and Materials). We investigated the effects of four impurity types in the unrefined methanol on biodiesel preparation. Alcohol impurities acting as co-solvents and transesterification agents can increase the yield and heating value. Organic solvent impurities can only act as co-solvents; thus, they can only improve the yield. Ester impurities (methyl formate) exhibited no effects on the yield and heating value because they evaporated in the ester exchange reaction. Water impurities significantly reduced the yield by affecting the miscibility of waste cooking oil and pure methanol. However, the negative effects of these impurities were alleviated when water was mixed with the organic solvent impurities. This study has a great significance for the resource and energy of unrefined methanol. © 2015 Elsevier Ltd. Source


Hou S.,University of Science and Technology Beijing | Li Z.,University of Science and Technology Beijing | Li Z.,Beijing Key Laboratory on Resource Oriented Treatment of Industrial Pollutants | Zhang Y.,University of Science and Technology Beijing
Research of Environmental Sciences | Year: 2015

The effects of sludge ecological treatment were investigated, and the treatment efficiencies of the traditional drying bed, reed bed and reed and earthworm integrated wetland system were compared. The results showed that the traditional drying bed was easy to operate and relatively inexpensive, but its sludge dewatering efficiency was low. The moisture content of sludge was 79.8% after 15 days. The reed bed was superior to the traditional drying bed. The moisture content of the sludge in the reed bed decreased to 67.8%, but the removal rates of organic matter, total nitrogen and phosphorus were insignificant. The reed and earthworm integrated wetland system had obvious effects on sludge dewatering. The moisture content of sludge decreased from 95.1% to 44.4%, and the volume apparently decreased. Electron microscopy demonstrated that the sludge treated by the integrated wetland system had interspaces and lamellar structures, benefitting air and moisture loss. Thus, the reduction targets were achieved. The organic matter, total nitrogen and phosphorus were reduced by 14.5%, 20.3% and 13.2%, respectively. Thermo gravimetric analysis showed that the volatile compound content in the sludge bed decreased. The residue ratios of Cu, Ni, Zn and Cr in the sludge increased from 3.2%, 23.7%, 15.2% and 55.8% to 73.3%, 43.1%, 78.3% and 78.6%, respectively; thus the heavy metal contents in sludge were stabilized. Infrared spectroscopy showed that the sludge treated by the integrated wetland system had more ─COOH and amide, which catalyzed the stabilization of heavy metals. Therefore, the reed and earthworm integrated wetland system effectively enhanced sludge stabilization and reduced secondary pollution. ©, 2015, Editorial department of Molecular Catalysis. All right reserved. Source


Lin H.,University of Science and Technology Beijing | Lin H.,Beijing Key Laboratory on Resource Oriented Treatment of Industrial Pollutants | Xu J.,University of Science and Technology Beijing | Xu J.,Beijing Key Laboratory on Resource Oriented Treatment of Industrial Pollutants | And 5 more authors.
Huagong Xuebao/CIESC Journal | Year: 2015

To modify corncob by graft copolymerization, the methacrylic acid and a potassium permanganate-sulfuric acid redox system were used as monomer and initiator, carboxyl groups was introduced successfully. Scanning electron microscope (SEM), Fourier transform infrared spectrometer (FTIR) and zeta potential analysis were used to characterize corncob and the effects of adsorption conditions on the adsorption of Cd2+ in aqueous solutions and its mechanism analyzed. The results showed that the experimental data obtained could be represented with a Langmuir isotherm, the adsorption rate followed pseudo-second-order kinetics and the rate-controlling step was the chemical sorption. Under certain conditions the adsorption rate was affected by both intra-particle and film diffusion rates. The maximal adsorption capacities of Cd2+ for methacrylic acid grafted and crude corncobs were 28.00 mg·g-1 and 5.96 mg·g-1, respectively, indicating improvement of nearly 4 times (adsorption conditions: pH 7, the dosage 5 g·L-1, temperature 30℃, adsorption time 6 h). The adsorption was a spontaneous endothermic process, the higher the temperature was, the greater the degree of spontaneous. During the process of adsorbing Cd2+, the groups on the surface of grafted corncob, including carboxyl, hydroxyl, amide and methyl groups could play important roles. It was found that there existed some wrinkles and white particles on the surface of grafted corncob after adsorbing Cd2+, and its porosity disappeared and electronegativity increased. © All Right Reserved. Source

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