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of biofuels have grown over the past decade, driven largely by the introduction of new energy policies in europe, the usa and brazil that call for more renewable, lower-carbon fuels for transport. today biofuels represent around % of road transport fuels in use around the world. types of biofuels today...
(generally clean with traces of oils and fuel ) groundwater infiltrated into sewage mixing with other types of wastewater or fecal sludge pollutants[ edit ] the composition of wastewater varies widely. this is a partial list of pollutants that may be contained in wastewater: chemical or physical pollutants...
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