The petrochemical industry generates large volumes of wastewater or effluents that need to be treated before they can be reused or released into natural waterways. Total organic carbon (TOC) and the total nitrogen bound (TNb) content is routinely determined, as these contaminants lead to eutrophication of surface water recourses, endangering aquatic life and groundwater supplies. According to the European Industrial Emissions Directive (IED), Best Available Techniques (BAT) have to be implemented within the EU for direct wastewater discharges from the refining of mineral oil and gas. The BAT reference document (BREF) indicates that, among other parameters, TOC and TNb are of growing importance
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