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Characterization and analysis of petrochemical wastewater through particle size distribution, biodegradability, and chemical composition
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作者 Xiaoqiang Jia Dayao Jin +1 位作者 Chen Li Wenyu Lu 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第2期444-451,共8页
The centralized treatment method is a widely used form of wastewater treatment that tends to be less effective at removing toxic substances. Therefore, a detailed analysis of the composition of wastewater can provide ... The centralized treatment method is a widely used form of wastewater treatment that tends to be less effective at removing toxic substances. Therefore, a detailed analysis of the composition of wastewater can provide important information for the design of an effective wastewater treatment process. The objective of this paper was to investigate particle size distribution(PSD), biodegradability, and the chemical composition of the petrochemical wastewater discharges. For this purpose, this project selected the petrochemical wastewater and treated wastewater of China National Offshore Oil Corporation Zhongjie Petrochemical Co, Ltd. as the analysis objects.The step-by-step filtration method, along with a molecular weight classification method, was selected to build the chemical oxygen demand(COD) and biochemical oxygen demand(BOD) fingerprints of petrochemical wastewater and treated wastewater. The results showed that the main pollutants were settleable particles in petrochemical wastewater, which contributed to over 54.85% of the total COD. The colloidal particles with particle sizes in the range of 450–1000 nm had the highest COD value in the treated wastewater, which contributed34.17% of the total COD of treated wastewater. The results of the BOD analysis showed that the soluble fractions were the main reason that treated wastewaters did not meet the treatment standards. Tests on the organic compounds in petrochemical wastewater found that there were mainly linear paraffins, branched paraffins, benzene series compounds, and some plasticizers in the influent of the petrochemical wastewater. The most abundant pollutants in treated petrochemical wastewater were the adjacent diisobutyl phthalate and the linear alkanes.Fourier transform infrared(FTIR) transmission spectroscopy analysis showed that the settleable particles of petrochemical wastewater and membrane bioreactor(MBR)-treated wastewater contained multiple types of organic substances. The results also indicated that removing the oil-settleable substances, t 展开更多
关键词 PETROCHEMICAL wastewater GRADIENT membrane separation Chemical OXYGEN DEMAND BIOCHEMICAL OXYGEN DEMAND
n-Hexadecane and pyrene biodegradation and metabolization by Rhodococcus sp. T1 isolated from oil contaminated soil
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作者 Xiaoqiang Jia Yun He +2 位作者 Lei Huang Dawei Jiang Wenyu Lu 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第2期411-417,共7页
The high-molecular weight polycyclic aromatic hydrocarbons(PAHs) pyrene and typical long chain alkane nhexadecane are both difficult to degrade. In this study, n-hexadecane and pyrene degrading strain Rhodococcus sp. ... The high-molecular weight polycyclic aromatic hydrocarbons(PAHs) pyrene and typical long chain alkane nhexadecane are both difficult to degrade. In this study, n-hexadecane and pyrene degrading strain Rhodococcus sp. T1 was isolated from oil contaminated soil. Strain T1 could remove 90.81% n-hexadecane(2 vol%) and 42.79% pyrene(200 mg·L-1) as a single carbon within 5 days, respectively. Comparatively, the degradation of pyrene increased to 60.63%, but the degradation of n-hexadecane decreased to 87.55% when these compounds were mixed. Additionally, identification and analysis of degradation metabolites of Rhodococcus sp. T1 in the above experiments showed that there were significant changes in alanine, methylamine, citric acid and heptadecanoic acid between sole and dual substrate degradation. The optimal conditions for degradation were then determined based on analysis of the pH, salinity, additional nutrient sources and liquid surface activity.Under the optimal conditions of pH 7.0, 35℃, 0.5% NaCl, 5 mg·L^-1 of yeast extract and 90 mg·L^-1 of surfactant,the degradation increased in single or dual carbon sources. To our knowledge, this is the first study to discuss metabolite changes in Rhodococcus sp. T1 using sole substrate and dual substrate to enhance the long-chain alkanes and PAHs degradation potential. 展开更多
关键词 BIODEGRADATION Metabolite N-HEXADECANE PYRENE RHODOCOCCUS sp. T1
Whole genome synthesis: from poliovirus to synthetic yeast
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作者 Junbiao Dai Yizhi Cai +2 位作者 Yinjing Yuan Huanming Yang Jef D. Boeke 《中国电气与电子工程前沿:英文版》 CSCD 2017年第1期105-109,共5页
Computational fluid dynamics simulation of a novel bioreactor forsophorolipid production
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作者 Xiaoqiang Jia Lin Qi +4 位作者 Yaguang Zhang Xue Yang Hongna Wang Fanglong Zhao Wenyu Lu 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2017年第6期732-740,共9页
This paper describes three-dimensional computational fluid dynamics (CFD) simulations of gas-liquid flow in anovel laboratory-scale bioreactor contained dual ventilation-pipe and double sieve-plate bioreactor (DVDS... This paper describes three-dimensional computational fluid dynamics (CFD) simulations of gas-liquid flow in anovel laboratory-scale bioreactor contained dual ventilation-pipe and double sieve-plate bioreactor (DVDSB)used for sophorolipid (SL) production. To evaluate the role of hydrodynamics in reactor design, the comparisonsbetween conventional fed-batch fermenter and DVDSB on the hydrodynamic behavior are predicted by the CFDmethods. Important hydrodynamic parameters of the gas-liquid two-phase system such as the liquid phasevelocity field, turbulent kinetic energy and volume-averaged overall and time-averaged local gas holdups weresimulated and analyzed in detail. The numerical results were also validated by experimental measurements ofoverall gas holdups. The yield of sophorolipids was significantly improved to 484 g. L^-1 with a 320 h fermenta-tion period in the new reactor. 展开更多
关键词 Bioreactors Gas HOLD-UP COMPUTATIONAL FLUID dynamics (CFD)Hydrodynamics Sophorolipid production
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