Detection Method And Removal Technology For Trace Organics In The Water

A small amount of engine oil and lubricant will enter into water system because of sealing problem in the long-term operation of mechanical equipments In the process of production of high purity water. These engine oil and lubricant will not only pollute the water but also affect the normal operation and working of mechanical equipments. Therefore, it is very necessary to carry out research on the remove technology of mineral oils in water. Azo compounds are likely to generate carcinogenic aromatic amines under reducing conditions, which will cause potential harm to environment and human health. Research on the removal of Azo compounds in water is significantly important to environmental protection. Research on the degradation technology of methyl orange which is a typical azo compound is very to environmental engineering.1. Establishment of detection method of oil in the water. This thesis proved the accuracy of detection method of trace oil in water including ultraviolent calibration curve method, ultraviolent working curve method, infrared absorption characteristic detection method, infrared oil content analyzer method and total organic carbon detection method by a series of experiments. The results show that the average relative deviation of ultraviolent calibration curve method is11.72%; the average relative deviation of ultraviolent working curve method is4.63%; the average relative deviation of4cm cuvette infrared absorption characteristic detection method is2.6%; the average relative deviation of1cm cuvette infrared absorption characteristic detection method is1.72%; the average relative deviation of JDS-106A infrared oil content analyzer method is0.83%and the average relative deviation of TOC-VCPH total organic carbon detection method is1.7%.2. Advanced removal technology of oil in water. First, we chose exfoliated graphite (EG) as oil absorption function material and proved that EG can decrease the concentration of oil in the water from20ppm to under1ppm by static experiments, and the oil absorption performance of EG is not affected after soaked in water for15d. The influences of absorption time, temperature, pH values, stirring speed and time on the oil and water absorption performance of EG were studied. The micro morphology of EG was characterized by scanning electron microscope (SEM). We discussed the oil absorption mechanism of EG and designed the pretreatment technology of EG and advanced oil removes technology of EG. Second, compared the performance of polypropylene fiber with that of polyester fiber by static and dynamic experiments, we chose polypropylene fiber as oil absorption function material. The influences of initial concentration, flow velocity of circulating water and absorption temperature on the oil absorption rate were studied. At last, we found that dual wavelength ultraviolent light (185n m and254nm) can effectively degrade oil in the water but single wavelength ultraviolent light (185nm or254nm) has no obvious degradation effect on oil. We also discussed the oil degradation mechanism of dual wavelength ultraviolent light.3. Advanced removal technology of methyl orange in water. Uniform ZnO microspheres were successfully synthesized by a hydrothermal route. Foam nickel/silane film/ZnO composites were prepared by loading ZnO microspheres on the foam nickel with water base silane film as the binder. The morphology of composites was investigated by scanning electron microscopy (SEM). The results revealed that ZnO microspheres with diameters of5μm were assembled by many porous nanosheets which were about10nm in thickness. Silane films which had thickness of about1μm were well adhered to the nickel foam, and some ZnO microspheres were embedded in silane films. The photocatalytic performances of composites loaded with ZnO for different cycles and those loaded with TiO2in the photodegradation of methyl orange were investigated. The results indicated that composites loaded ZnO for1cycle show the best photocatalytic performance and composites loaded with ZnO showed better photocatalytic performance than those loaded with TiO2-...