Fertilizer site complex

Shown in Figure 10, this ammonia plant is a major part of the overall fertilizer site complex. Other major facilities include urea plant, steam system, and cooling water system. Most of the ammonia is used to make granulated urea product. The other raw material for urea synthesis is C02 from the C02 capture system in the ammonia plant, supplemented with a small stream from an adjacent business. The ammonia production and the C02 available from the ammonia plant are never precisely in balance, in part because of the overall stoichiometric yields of ammonia and C02 from the natural gas feedstock. C02 is the limiting feedstock for the urea plant and its production rate in the ammonia plant sets the urea plant production rate since there is no intermediate C02 storage to buffer the urea production from the C02 production rate. Ammonia that is produced in excess of that which is used to make urea... 

The history of the use and identification of Cannabis sativa L. is long and complex. It is one of the oldest cultivated plants, used for the production of oil from the seeds, and fibre from the stems for rope and fabrics, and has long been used as a psychoactive drug due to the presence of cannabinoids in the resins produced by the plant. Indeed, there is evidence of cannabis use from Neolithic burial sites. The name Cannabis sativa was first used in Linnaeus Genera Plantarum in 1753, but since that publication there has been considerable debate about the number of species and varieties that exist - this has been recently summarized succinctly by Gigliano [1]. The debate has centred on (i) the characteristics of the fruit, and (ii) meiosis and pollen fertility. It is now generally accepted, however, that there is only one species, namely Cannabis sativa L., which exhibits great diversity due to both selection in the wild and in the cultivated environment. 

Numerous pollutants are discharged directly into the atmosphere by human industry, where winds may transport them to Earth s most remote corners. It is important, however, to note that industry is not the sole source of contaminants individuals also contribute to this problem through the use of household pesticides and fertilizers, improper disposal of hazardous materials (e.g., used motor oil, paints, cleaning products), and even by driving the family car. Consequently, sites with one predominant contaminant are a rarity complex mixtures and subsequent exposures define the real world. 

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