Applied Mechanics and Materials Vols. 675-677

Abstract: The experimental treatment of emulsifying wastewater containing fluo- rescent permeating agent is conducted using demulsification, flocculation, sedimentation and Fenton processes. The experimental results show that, under the appropriate conditions, the COD, oil and chromaticity can be removed efficiently. The pH, COD, oil and chromaticity of the outwater can reach the national standards.

Abstract: Microwave enhanced Fenton oxidation treatment effect of reactive yellow dye wastewater is studied. Through experimental analysis the effect of H₂O₂ dosage, FeSO₄•7H₂O dosage, microwave power, irradiation time to dye wastewater Degradation rate. Microwave enhanced Fenton oxidation process treating active yellow dye wastewater optimum conditions: pH value of 3, H₂O₂ volume concentration of 4mL/L, FeSO₄•7H₂O concentration of 200mg/L, microwave power of 500W, irradiation time of 7min. Under this condition, reactive yellow dye wastewater removal rate is 92%.

Abstract: The voltage is the critical electrochemical parameter in microbial fuel cells (MFCs).There are three major oilfield wastewaters including water flooding produced water, polymer flooding produced water and ASP flooding produced water. These three wastewaters were used as anode substrate of three MFCs in this study. The influence and the influencing factors of the output voltage of the three MFCs and the produced water main refractory organics removal effect were studied. The results show that During this reaction period, MFCs cathode potential stays relative stable, however, anode potential shows a remarkable increasing trend, thus, the anode contributes mostly to the change in output voltage. COD removal effect of Anode substrate and the coulombic efficiency are both influencing factors of the anode potential .The microbial fuel cell for wastewater of surfactant, remove the best effect;For different produced water, oil and polymer removal effect abide by the MFC output voltage and COD value changing law.

Abstract: Based on the tests of the high concentration organic wastewater from the sampling of Maotai flavor liquor enterprises in Chishui River Basin after two stages of biochemical treatment, this study found out the residue COD concentration range and investigated the rules of its formation. Under anaerobic conditions,the inert COD (S_I) were measured.The experimental results showed that: the anaerobic retention time was 48 hours and the COD concentration of the effluent after aerobic biological treatment was about 300~350mg/L, the residual BOD₅ accounted for 1~2%, the difficult to degrade in raw water COD accounted for 28~33% and SMP accounted for 65~73%. In conclusion, the research findings can provide a scientific justification for the depth treatment process of liquor wastewater to reach the standard.

Abstract: Due to the increase in population and the standard of living along with rapid industrialization, various kinds of water demands have been increasing resulting high pollutant emissions. Moreover, the level of pollution in regards to the water quality of oceans, lagoons, and rivers has been aggravated. In particular, lagoons across the globe are suffering from the use of fertilizers, manual wastes and dead remains. A lack of dissolved oxygen (DO) has been a problem for the lagoon water quality. Many living creatures in the lagoon have become prone to death and their dead remains further aggravate the water quality. Dredging the bottom of lagoon to remove various wastes, vegetation inside the lagoon for self-purification and employing micro bubble machines to increase DO are methods to alleviate the problem. Alternative and additional solutions may be applied depend on the condition of the lagoon. For most lagoons are comprised of oxygen-deficient water mass, a micro bubble machine is particularly efficient for its micro-aeration in amplifying DO. Regular aeration method may accompany inefficiency in increasing the level of DO in the lower boundary of water since the airdrops easily rise to the surface. Micro bubble system is employed for less oxygen rise to the surface over regular aeration. In this study, Micro bubble device is applied to Youngrang Lagoon in the east coast of Korea to investigate the efficiency of micro bubble technique. DO alleviate operation shows significant changes in DO level, yet it requires excessively high costs. To eliminate the shortcomings of the operation, renewable energy such as solar and wind energy are under consideration for valuable alternatives.

Abstract: The main theme of this paper is to assure the importance of natural material like peat to remove oil from water. Elimination of oil from the water is not a simple task. It requires some particular processes to separate oil from water. Oil in water is not only harmful for sea life but also the few manufacturing processes like dyeing and finishing of textiles cannot be carried out efficiently because of low absorbency. That is why it is very much important to remove oil from water. It is known that peat has outstanding absorbency qualities, since in its natural state is has absorbed approximately 90% water, however, that on drying peat to approximately 5-10% moisture content in the manner , such peat can absorb other liquid materials, like oil. This paper will explore the ability of peat to take in oil from oil polluted water. The absorption of oil measured by designed experiment.

Abstract: In this paper, induction and summary of the current situation and the harm of heavy metal pollution in soils and influence on food safety has been made. It introduced the soil heavy metal into the food, and put forward specific measures to reduce the impact of heavy metal on food security, in order to further attention to food safety and soil heavy metal pollution prevention and control technology and policy.

Abstract: In this paper, the use of water hyacinth as a feedstock for methane digester was examined. The main idea behind this work was how to make use of a resource (water hyacinth) that might otherwise have gone to waste. Biogas was produced from this digester which is a burnable fuel. Moreover, the digester sludge was used as fertilizer. Jeddah Waste Water Treatment Plant is a small plant with a total area of 4200 m² of ponds that could be used to produce water hyacinth when the plant operates at its full capacity. The following tasks were accomplished in sequence; sizing the digester, sizing the inlet and outlet tanks, designing the digester walls, sizing and designing the gas holder, and estimating the amount of insulation needed. It was found that the digester is able to produce approximately 9.55 m³/day of biogas.

Abstract: For a reduction ofthe volume and cost of equipment, some thermal power plants have no gas heater in their desulfurization systems. Because of desulfurized gas with high humidity, residual dust, and limestone slurry, induced draft fan (IDF) is often subject to vibration caused by dust accumulation while operating, resulting in occasional shut-down for dust cleaning. To solve this problem, fine sand was added to jet nozzle in the circumstance of severe dust accumulation, to enhance cleaning effect in this study. The Fluent software was used to simulate the static pressure distribution on non-working surfaces of the IDF blades with different sand flows. Results showed that the addition of fine sand could enhance the static pressure on non-working surfaces. The optimum ratio of nozzle flow to sand flow was concluded. This was of great significance for IDF on low load to prevent dust accumulation vibration and to keep safe and stable operation.

Abstract: In order to use the demister more scientifically and rationally, the numerical simulation of gas-liquid two-phase flow was implemented in two dimensional demister blades by different combinations of parameters using FLUENT software. The relationship between either the pressure drop or demisting efficiency and these factors of droplet diameter, gas velocity and plate spacing in san-he power plant was obtained respectively. The simulation shows that: With the change of the droplets diameters and blades spacing, the import and export pressure drop almost have no change. But it will increase with the increasing of gas velocities; With the increasing of droplets diameters, the demisting efficiency is increasing rapidly; The demisting efficiency increases with the increasing of gas velocities and decreases with the increasing of blades spacing.Keywords: Numerical Simulation, droplet diameter, gas velocity, plate spacing.