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The re-usages of wastewater within industry: the positive impact of contaminants

Kralj, Anita Kovac
Journal of cleaner production 2015 v.95 pp. 124-130
absorption, carbon dioxide, formalin, freshwater, industry, mass flow, methanol, raw materials, solvents, wastewater, water reuse
The purposes of reusing wastewater are to save fresh water and for the preparation of raw materials or utilities. This presented paper focuses on wastewater from one process being be used within another process by using the mass flow exchange technique. The basic goals of this technique include:• wastewater transformation from one to another process.• reuse of wastewater thereby saving the fresh water.• contaminants within wastewater have positive impacts.The benefit of this technique is the saving of fresh water and a more efficient operating of the absorption system because of including the contaminants within wastewater. This re-usage of wastewater was tested on an existing formalin process regarding a current methanol process that allows the saving of 5478 kg/h of fresh water during the absorber system by replacing it with wastewater, containing the allowed quantities of 30 kg/h CO2 and 50 kg/h methanol. The wastewater with inclusive methanol had a positive impact on the balance during the absorber system, more formaldehyde could be absorbed within the solvent, and therefore could produce 37% instead of 35% formalin, which was the aim of this study. The benefit of this technique is to save fresh water by using wastewater transformation from one to another process.