Pollutant migration behavior in slurry ponds at Ordos Basin gas well sites
With an acceleration in the rate of gas exploration in Ordos Basin, more and more waste drilling mud has been discharged. After a series of treatment, the waste mud had been buried in some slurry ponds. So a significant number of ponds are scattered in the basin, which give more harm to the fragile ecological environment. But until now, there is little research focusing on real environmental effects of pollutants in slurry ponds. This research chose five slurry ponds used in succession during 2005 and 2009 as targets. The migration behavior of organics, oil and sulfide was studied, and their possible effects on shallow groundwater were forecasted. The results showed that the order of these three pollutants' effects on environment was sulfide>;oil>;organics. According to the migration behavior of mentioned pollutants, it came to conclusion that the sulfide and oil in the slurry ponds used over two years should have brought much influence on shallow groundwater.
Features of Vegetation Community and Changes of Soil Physical and Chemical Property in the Sand-fixation Forest by Aerial Seeding
Through field investigation,sampling and indoor analysis,the features of vegetation community and changes of soil physical and chemical property have been studied in aerial seeding area in Wushen County.The results show that the longer the time of forestation by aerial seeding is,the more obvious increase is for the coverage,species and biomass of surface plant.Simultaneously,aerial seeding can enhance physical clay content of soil,and augment organic matter,total N,total P,rapidly available nutrient in the experimental ground.And the contents of soil nutrients will increase obviously as the time for forestation prolongs.
Ozonation of pyrene in aqueous solution
Abstract The reaction of pyrene with ozone was studied in aqueous solution at low (10–200 μg l−1) substrate concentration and with ozone concentrations (5 mg l−1) approximating to those used in potable water treatment. Degree of reaction and the formation of polyaromatic/aromatic reaction products were assessed using a technique of solvent extraction and derivatisation with gas chromatographic (GC), gas chromatographic-mass spectrometric (GC-MS), high performance liquid chromatographic (HPLC) and u.v. spectrometric analysis of extracts. A freeze drying/derivatisation technique with GC and GC-MS analysis was employed for the isolation/identification of short chain polar aliphatic reaction products. Substantial destruction of pyrene was recorded within 1 min of reaction with ozone. Polyaromatic/aromatic compounds did not persist; reaction products are likely to be short chain polar aliphatic compounds. Products of this type were isolated but not identified in the study.