Zhang Zhitao's research while affiliated with Dalian Maritime University and other places

Publications (9)

Article
When a gas–liquid turbulent jet with hydroxyl free radicals is jetted into a ballast water discharge pipe to kill the invasive microbes, there is a challenge for hydroxyl free radicals to contact a large number of microbes in ballast water. In this paper, the Eulerian–Eulerian two-equation model is employed to simulate the mixing process of gas–liq...
Article
Using fogdrops of OH˙ radicals to eliminate microbial contamination is an effective way to solve the current domestic and international problem. The results show that the threshold of OH˙ solution used in the experiment is 0.6 mg/L, the lethal time is 1 s, and the spray density of OH˙ solution is 21 μL/m2. The experimental results show that the OH˙...
Article
With the physical method of micro-gap gas discharge, OH radicals were produced by the ionization of O2 in air and H2O in the gaseous state, in order to explore more effective method to treat the ship's ballast water. The surface morphology of Al2O3 dielectric layer was analysed using Atomic Force Microscopy (AFM), where the size of Al2O3 particles...
Article
The applications and principles of the plasma technique in biomass macromolecule are introduced in this paper, and application of plasma technology in solid biomass macromolecule, which will widen the range of plasma polymerization and the form of the polymer, is proposed. In order to perform biomass plasma polymerization, the problems existing in...
Article
The performance of dielectric material is a key factor against a long time action in dielectric barrier discharge (DBD) plasma. In this study, the aging of the Al2O3 dielectric material was studied by the Atomic Force Microscope (AFM), X-ray Photoelectron spectrum (XPS) and Auger electron spectrum (AES) methods. The results showerd that the perform...
Article
Abnormal phenomena that discharge performance declines with the increase in the frequency of power supply have been observed in many DBD devices. DBD systematic resonance formed by transformer leakage induction and equivalent capacitance of the dielectric layer is a key factor causing such abnormal phenomena. Therefore, the parameters of a DBD devi...
Article
A pilot-scale experiment of 20 t/h for the treatment of ship's ballast water is reported in this paper. When the concentration of the dissolved OH was 0.68 mg/L during the experiment, the rate of destroying bacteria, mono-algae, protozoan reached 100% within 2.67 s. The effect of hydroxyl radicals on biochemical processes was also studied. The atte...
Article
Full-text available
With physical method of micro-gap gas discharge, a large amount of hydroxyl radical can be produced in 20t/h pilot-scale system using the ionization of O2 and H2O. In this paper, the effect of biochemistry of hydroxyl radicals on introduced organisms in ballast water was experimentally investigated. The results indicate that the contents of chlorop...
Article
The plasma synthesis of ammonia has been studied in a nitrogen–hydrogenplasma using a strong electric field discharge at ambient pressure andtemperature. With this method, N2 and H2 molecules are ionized anddissociated and a large number of free atoms, ions, and radicals areformed in a nonequilibrium plasma after inelastic collisions. The finalprod...

Citations

... In a typical impinging stream device, two feed streams, flowing either parallel or counter-currently, collide at a zone in which the two streams impinge. [3,16,17] Impinging streams systems have been successfully applied to many chemical processes such as absorption, [18] liquid-liquid reaction, [19][20][21][22] gas-liquid reaction, [23][24][25] solid-liquid flow, [16,26] extraction, [27] mixing, [28] enzyme reactions, [29] physical-chemical vapor deposition, [30] and degradation of phenol in aqueous phase. [3] Moreover, various processes have been carried out in spray reactors with two impinging streams including absorption of carbon dioxide, photocatalytic reaction [3,31] and acetone in water, [14,25] and formation of certain chemical products. ...
... In summary, each generation of 100 eV energy can produce 5.5 ·OH, a total of 8.25 or more free radicals. The number of ·OH was more than 10 times the weak ionization discharge, resulting in high concentration of O 3 and ·OH [21,22]. O 3 , ·O, O , O 2 2 + and other active particles produced by the DBD reactor in the strong ionization discharge water treatment system entered the gas-liquid mixing device through the Venturi jet and reacted with the water molecules to produce the active substance. ...
... For more details on such system dynamics and control theory, the reader is referred to, e.g., Takahashi et al. [113]. An easy and convenient procedure to characterize this frequency is to apply a constant input voltage V input to the HV transformer and to systematically vary the operating frequency f as shown by Yang et al. [114]. The resulting slope of the HV transformer's current drain I input is plotted in Fig. 14 for various loads. ...
... The dielectric thin layer that have the high dielectric strength and high dielectric constant of glass, quartz, ceramics, mica and aluminum oxide (Al 2 O 3 ) covered in the electrode surface constituted dielectric barrier discharge (DBD) reactor [12]. The strong ionization discharge can be achieved at atmospheric pressure or above atmospheric pressure. ...
... The occurrence of an integral membrane lessens the possibility of radical achieving an intracellular attack on species such as amino acids and deoxyribonucleic acids. After the radicals are produced very near to the target molecules, they will be in a position to impose harmful effects (Mindong et al., 2007). Lipid peroxidation can be divided into three main cycles including initiation, propagation, and termination. ...
... Yet, strong academic interest and developments show promising potential [18]. The plasma-catalytic synthesis of NH 3 in nonthermal plasma (NTP) reactors has been mostly explored at relatively low operating conditions, i.e. ambient temperature and pressure [19][20][21][22][23][24][25]. Among different kinds of NTP reactors, such as glow discharge, microwave plasma, radio frequency discharges, plasma-liquid systems, arc discharges, and dielectric barrier discharge (DBD) reactors, the latter has been the most increasingly studied for NH 3 production, due to its flexibility and its ease of allowing the integration of catalysts [25]. ...