Biomedical subjects

Ya-lei Zhang

Publications and source records attributed to Ya-lei Zhang.

4 recordsLinked to original sources

PubMed2006

[Experimental research on separate structure jet aerator].

A new type of jet aerator (separate structure jet aerator) was designed and developed, and an idea of separate design was put forth. This type of jet aerator was mainly applied to the treatment of small-scale wastewater and industrial wastewater of high density treatment projects. The experimental set-up was built to investigate the influences of the structural parameters (R1, R2 and R3) on the gas suction flowrate. The experimental results are listed as follows: the gas suction flowrate fluctuates with the changes of R2, and the optimal R2 is relevant to the length of the mixing tube; R3 does not contribute a lot to the suction performance, but choosing a suitable R3 can help to make further use of the gas suction potential of the jet aerator while keeping the other parameters unchanged; R1 has a great impact on the suction performance, and the optimal R1 can be found out in the transitional region. The experiments also prove that it is feasible to apply CFD to designing jet aerator, since its gas suction flowrate is high (reaching 900 approximately 1100 L/min) and it shows prominent performance in agitating liquid.

Bioreactors↗

PubMed2005

Degradation of 2,6-di-tert-butylphenol by an isolated high-efficiency bacterium strain.

An aerobic bacterium strain, F-3-4, capable of effectively degrading 2, 6-ditert-butylphenol (2, 6-DTBP), was isolated and screened out from an acrylic fiber wastewater and the biofilm in the wastewater treatment facilities. This strain was identified as Alcaligenes sp. through morphological, physiological and biochemical examinations. After cultivation, the strain was enhanced by 26.3% in its degradation capacity for 2,6-DTBP. Results indicated that the strain was able to utilize 2,6-DTBP, lysine, lactamine, citrate, n-utenedioic acid and malic acid as the sole carbon and energy source, alkalinize acetamide, asparagine, L-histidine, acetate, citrate and propionate, but failed to utilize glucose, D-fructose, D-seminose, D-xylose, serine and phenylalanine as the sole carbon and energy source. The optimal growth conditions were determined to be: temperature 37 degrees C, pH 7.0, inoculum size 0.1% and shaker rotary speed 250 r/min. Under the optimal conditions, the degradation kinetics of 2,6-DTBP with an initial concentration of 100 mg/L was studied. Results indicated that 62.4% of 2,6-DTBP was removed after 11 d. The degradation kinetics could be expressed by Eckenfelder equation with a half life of 9.38 d. In addition, the initial concentration of 2,6-DTBP played an important role on the degradation ability of the strain. The maximum initial concentration of 2,6-DTBP was determined to be 200 mg/L. Above this level, the strain was overloaded and exhibited significant inhibition.

Alcaligenes↗

PubMed2004

[The degradation characteristics of degrading bacterium of 2,6-di-tert-butylphenol].

A degrading bacterial strain F-3-4 for 2,6-Di-tert-butylphenol (2,6-DTBP) was isolated from biofilm in acrylic fiber wastewater treatment structures. By acclimation, its capacity for degradation of 2,6-DTBP was enhanced by 26%. It was identified as Alcaligenes sp. according to morphological, physiological and biochemical characters. By tests in shaking flasks, the effects of the conditions of growth was studied, and it was determined that the optimum conditions of growth for the strain was 37 degrees C, pH 7.0 and inoculum amount 0.1%. Under these conditions, the kinetics of degradation for 2,6-DTBP of initial concentration 100 mg/L was studied, and the result indicated that the removal rate of 2,6-DTBP within 11 days was 62.4%, and the degradation process followed Eckenfelder kinetics. The half life of 2,6-DTBP was 9.38 days. The effect of initial concentration on degradation ability of the strain also was investigated. The results showed that the optimum initial concentration was 200 mg/L. When the initial concentrations were below it, the growth of strain and removal of 2,6-DTBP increased with the increase of initial concentration, while when above the value, they were inhibited.

Alcaligenes↗

PubMed2003

Biodegradation kinetic of organic compounds of acrylic fiber wastewater in biofilm.

A group function relation curve between flux (J) and bulk phase concentration of substrate (S) was set up. The biodegradation kinetic of organic compounds of acrylic fiber wastewater in biofilm is studied (the treatment technology is coagulation/sedimentation-anoxic/aerobic biofilm process), and the results showed that the concentration of non-degradation pollutants in effluent is 77 mg/L. In aerobic zone, the half-rate constant is 72.84 mg/L, the maximum removal rate of organic compounds at unit area filler is very low, 0.089 g/(m2 x d), which corresponds to the fact that there are some biorefractory compounds in the wastewater.

Acrylic Resins↗