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通过沙土柱实验考察了硫包衣尿素和甲醛尿素2种缓释肥料在不同pH值和盐度的海水介质中养分的释放特性,并利用摇瓶培养实验考察了这两种肥料对SZ36-1原油生物降解作用的影响.结果表明,在实验设置的pH(7.00—8.00)和盐度(24.00—32.00)范围内,pH值对硫包衣尿素和甲醛尿素肥料氮素释放性能有较大影响,其中,近中性的海水介质有利于硫包衣尿素中氮素的释放,弱碱性环境更有利于甲醛尿素的释放;而盐度对两种肥料的氮素释放均无明显影响.两种缓释肥料都能够持续释放氮素而维持石油烃降解菌QPH-2的生长,并促进原油中各组分包括烷烃和芳烃明显降解.其中,添加硫包衣尿素体系中各烷烃组分的降解率为13.94%—59.02%,芳烃类组分降解率为9.60%—32.33%;添加甲醛尿素体系中各烷烃组分的降解率为11.56%—49.65%,芳烃类组分降解率为13.49%—41.67%.
Through sand column experiment, the release characteristics of two kinds of slow release fertilizers of sulfur-coated urea and formaldehyde urea in seawater media with different pH value and salinity were investigated. The effects of these two fertilizers on SZ36-1 The results showed that the pH value had a significant effect on the nitrogen release properties of sulfur-coated urea and urea-formaldehyde fertilizers in the range of pH (7.00-8.00) and salinity (24.00-32.00) , Of which the near-neutral seawater medium is favorable for the release of nitrogen from sulfur-coated urea and the more alkaline environment is more conducive to the release of formaldehyde urea.The salinity had no significant effect on the nitrogen release from both fertilizers All kinds of slow-release fertilizers could sustain nitrogen release and maintain the growth of petroleum-hydrocarbon-degrading bacteria QPH-2, and promote the obvious degradation of each component in crude oil, including alkanes and aromatics. The degradation rate of aromatic components was 9.60% -32.33%, the degradation rate of each alkane component was 11.56% -49.65%, the degradation rate of aromatic components was 13.49% -41.67%.