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Ethylene Glycol Recovery

Operating tests on an integrated plant have been carried out in an important oil company. The tests aim was to check the opportunity to treat semi-oily wastewaters containing glycols by using reverse osmosis preceded by a clariflocculation and deoiling treatment, for which Technofluids owns the intellectual property.

During the tests, the main operating parameters of the integrated plant have been recorded and samples to be analysed have been collected after each treatment phase.

The results confirmed that the analysed waste can be concentrated by means of a two-stage reverse osmosis system, thus obtaining a fourfold reduction of the initial volumes and producing effluents that can be disposed of in the sewage system according to the current laws and/or reused in other productive processes. However, this would only be possible prior to a pre-treatment to remove oil substances, fats, iron, manganese and, more generally, all non-soluble substances.

The estimated operating cost for an integrated plant treating 5,000 m3/year of waste - which was confirmed by the consumptions recorded during the tests - is 4,8 euro/m3 of treated wastewater. This includes power consumption, consumables and membrane washing products, but not the reverse osmosis membrane replacement. This charge will only be determined through full scale and long duration tests.