A new type of starch/thatch composite with degradable property, which took starch as adhesive, thatch particles as main raw material and water as plasticizer, was successfully prepared by hot-embossing method. Mechanical properties of the composite such as hardness, tensile strength and ultimate elongation were investigated, and the effects of processing conditions on the mechanical properties were discussed. The results showed that the composite had the highest tensile strength and ultimate elongation but the lowest hardness when the amount of starch adhesive was 40% (dry basis) and water was 25% (wet basis) at hot-embossing temperature of 120°C for 10 min. It was suggested in our works that the hot-embossing method could be used to fabricate starch/thatch composite with starch content ranging from 20% to 50%, and that the composite with good hot-embossing process could be obtained by properly controlling the amount of starch and water.

In order to improve the steady permeate fluxes during the emulsified oil wastewater treatment using precoated dynamic membrane, a coupling process of precoating dynamic membrane with ultraviolet photocatalysis was studied. Impacts of the ultraviolet light power, pH values and the oil concentrations on improvement of the steady permeate fluxes were investigated. The results showed that the ultraviolet photocatalysis effectively improved the steady permeate fluxes and reduced the membrane fouling resistances during the emulsified oil wastewater treatment. The dynamic membrane steady membrane fluxes increased with the rise of ultraviolet light power and decrease in liquid pH values and oil concentrations. Impact of the ultraviolet photocatalysis on the oil retention ratio of precoating dynamic membrane was not obvious.

The highly overlapped chromatograms and spectra of salicylic acid (SA), gentisic acid (GA) and uncalibrated interferent, pyrocatechuic acid (PA) were resolved using HPLC-DAD combined with a novel second-order calibration method. Their elution time was set from 0.6628 min to 0.9495 min and the detection wavelength was chosen from 268 nm to 332 nm. Both SA and GA were determined simultaneously in aqueous solution with their recoveries were (101.0 ± 7.1) % and (105.8 ± 5.6) %, respectively. The satisfying results demonstrate this method can be easily performed and applied to solving second-order calibration problems quickly and accurately.

In this paper, effects of carbon source on the biofilm cultivation were investigated by adding or not adding liquid carbon source with corncob used as solid carbon source and biocarriers. By adding or not adding glucose in the culture solution, effects of carbon source on the biofilm cultivation were determined by measuring COD, NO3--N, NO2--N and pH of culture solution after reaction. Results showed that adding liquid carbon source was beneficial to forming the biofilm with good denitrification performance, however, not adding carbon source could only form biofilm with bad denitrification performance and denitrification reaction only proceeded to the step of NO2--N after reaction. Results indicated that it was necessary to add liquid carbon source for the forming biofilm with good denitrification performance on the surface of corncob biocarriers.