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For the disposal of mineral oil on
surface water and sewage systems, most governments have special
requirements on the quality of wastewater. The Dutch disposal resolution
for example allows a maximum concentration of 20 mg/l mineral oil, and
100 mg/l unresolved particles.
By means of a water-oil
separator, a large amount of oil can be removed from the wastewater.
However, chemically stabilized oil/water solutions should be managed
in an appropriate manner. These solutions can be purified by means
of
membrane filtration. (Ultra
Filtration) To remove the organic compounds that remain in the
permeate, ozone can be used. Research shows that pre-treatment with
ozone make reuse
of the UF permeate as process water possible. [1]
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[1] In-Soung Chang, Chang-Mo Chung, Seung-Ho Han, Treatment of oily wastewater by ultrafiltration and ozone.
Taejon, South Korea 2000
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