Advanced Materials Research Vols. 864-867

Abstract: The impact of glucose on the growth under heterotrophic and mixotrophic conditions for Monoraphidium sp. FXY-10 as well as its lipid content was investigated through the Andrew equation. The results demonstrated that the subsaturation constant of Monoraphidium sp. FXY-10 under heterotrophic condition to glucose was smaller than that of Monoraphidium sp. FXY-10 under mixotrophic condition, indicating that Monoraphidium sp. FXY-10 is more sensitive to glucose under heterotrophic condition. Furthermore, the biomass productivity, lipid productivity and lipid content of Monoraphidium sp. FXY-10 all reached the peak at 10 g L-1 of glucose concentration under both heterotrophic and mixotrophic conditions. Compared with other Chlorella sp., the Monoraphidium sp. FXY-10 represented higher lipid productivity (131.79 mg L^-1 d^-1).

Abstract: There are 6 samples of soybean paste which collected from market will be investigated. The results show that the total counts of lactic acid bacteria in the soybean paste samples was average 10⁵-10⁷cfu·g^-1, but the total counts of molds and yeasts in some samples was just 10³ cfu·g^-1. And the total counts of bacillus in samples was over 10⁵ cfu·g^-1 .Compared with nature fermented soybean paste, the counts of molds and yeasts was down. The results indicate that the microbiological compositions of the soybean paste samples maybe changed. There were less total contents of flavonoids in the soybean paste, only up to 1.26 mg/g.

Abstract: The influence of pH on Monoraphidium sp. FXY-10 growth, lipid content, lipid yield, biomass yield, and fatty acid composition is studied in autotrophic and heterotrophic conditions. The results reveal that Monoraphidium sp. FXY-10 can grow better in an acidic environment. Under autotrophic and heterotrophic conditions, the culture time is 37 and 9 day, respectively. And the maximum biomass of algal cells is 32 and 367mg/l/d with the lipid content in autotrophic and heterotrophic conditions reached to 49% and 39%, respectively, with high biomass yield, lipid yield, the saturated fatty acid and monounsaturated fatty acid under heterotrophic condition, proving that the algal cells are a viable material for the production of biodiesel.

Abstract: Composting has been shown to be an effective bioremediation technique for the treatment of hydrocarbon-contaminated soil. In this research, the major objective of this research was to find the appropriate mix ratio of organic amendments for enhancing the degradation of petroleum hydrocarbons during diesel oil contaminated soil composting. The spent mushroom was added as an amendment for supplementing organic matter for composting of contaminated soil. The volumn ratios of contaminated soil to organic amendments were 1:1, 1.5:1 and 2:1. Target contaminant of this research was diesel oil, which was spiked at 16240 mg/kg sample on a dry weight basis. The degradation of diesel oil was significantly enhanced by the addition of these organic amendments relative to straight soil control. Degradation rates of total petroleum hydrocarbons (TPH) were the greatest at the ratio of 1:1 of contaminated soil to organic amendments on the volumn ratio. The abiotic loss of TPH was only about 6.83% of initial TPH.

Abstract: The NaNO₃ concentration influencing the growth and lipid synthesis of Monoraphidium sp.FXY-10 under three cultures (autotrophy, heterotrophy and mixotrophy) was studied through flask-shaking experiment. Additionally, the impact of nitrogen source on the growth and lipid content of Monoraphidium sp.FXY-10 was investigated. The NaNO₃ concentration for maximum biomass and highest lipid content of Monoraphidium sp.FXY-10 was obtained and the optimal conditions for its N absorption were concluded through the Andrew model.

Abstract: Water samples were collected from the upstream to the downstream of a seasonal river, the Taizi River, and its main tributaries in dry season, normal season, and wet season. The variations of NH₃-N, and total phosphorus (TP) within a hydrological year were analyzed, aimed to study the pollution characteristics and sources of the water bodies. It was found that the tributaries of the Taizi River were heavily contaminated by NH₃-N, with 83.8%, 100% and 100% of the sampling sites exceeding the fifth level in the dry season, wet season and normal season, respectively. The concentration of TP in the dry season fluctuated wildly, which was much higher than those in the wet and normal season. Compared with the permissible levels set by the environmental quality standards for surface water standard (GB3838-2002) of China, 57.1% of the sampling sites in the main stream and tributaries of the Taizi River belong to the fifth level or exceed the fifth level in the dry season, and only 7.1% of the sampling sites were belonging to the fifth level or exceed the fifth level in the wet and normal season. Overall, the waterbody of Taizi River was more seriously polluted by urban domestic sewage and point source of industrial wastewater.

Abstract: A new fluorescent probe 1, bearing a pyridine group as receptor for H⁺ and a coumarin dye as fluorophore, was synthesized and characterized by ¹H NMR, ¹³C NMR, ESI-Ms and single crystal X-ray diffraction analysis. The probe exhibited fluorescence ratiometric response to acidic pH. With decreasing of the pH from 8.32 to 2.49, the fluorescence emission spectra exhibited large red shift from 541 to 631 nm, with the emission ratios (I₅₄₁ /I₆₃₁) changed dramatically from 25.9 to 0.08, and the pK_a value was calculated to be 5.45. Probe 1 exhibited high selectivity to pH, other interference species including metal ions and amino acid exerted no visible effect on probe 1 detecting pH. The intracellular pH imaging applications proved that the probe is suitable for monitoring acidic pH fluctuations in living cells.

Abstract: Coal coking wastewater is generated from coking, coal gas purification and coking product recovery process, its composition is complex and difficult to degrade. By introducing the coking wastewater treatment research and application, such as adsorption,coagulation and sedimentation, flue gas treatment and other physical methods, as well advanced oxidation, wet oxidation, Fenton reagent method, photocatalytic oxidation, ultrasonic oxidation, ozone oxidation method, electrochemical oxidation, supercritical water oxidation, incineration and plasma technology, this paper puts forward the trend of coking wastewater treatment technology.

Abstract: The phenol oxidation with persulfate catalyzed were studied. Effects of several parameters, such as dose of oxidant, pH, temperature and UV irradiation, were investigated in detail. The results showed that the phenol oxidation by persulfate could be fitted to a pseudo-first order kinetics model. The optimum acidity of the phenol oxidation system in the paper is ca. pH 8.76, the optimum temperature which is ca.70 °C and the optimum molar ratio of persulfate to the phenol is ca.40 in the solution.The results are useful for the treatment of industrial wastewater. Key words: Phenol oxidation Schiff base manganese (III) complexes Persulfate

Abstract: Three oxidant decontaminants, including NaClO, H₂O₂ and an organic peroxyl acid, were introduced to destroy the cyanide ion. The residual cyanide ion concentrations in different decontamination water were detected by a cyanide ion selective meter. Before the detection process, the oxidants left in the cyanide decontamination water were pretreated by adding a certain amount of Na₂SO₃. Results showed that starch-iodide solution indicator method presented a perfect function on determining the dosage of Na₂SO₃. Values of the relative mean deviations on residual cyanide detection were below 5%. After the decontamination water was deoxidized by Na₂SO₃, whether the sample distillated or not could not affect the value of CN^- quite much. Non-distillation was confirmed alternative in the detection of cyanide ion decontamination water. Too much standing time would lead to a relatively lower CN^- concentration, especially in that of non-distillation.