Abstract
The coagulation/iron chipping micro-electrolysis process was used to treat drilling wastewater .A new method of the depth removal of CODCr in wastewater from petroleum drilling was put forward. The effects on the reaction were investigated by single factor tests. The optimal conditions of the treatment are given as follows: weight ratio of iron chipping to reactive carbon 0.5, pH1.0, reaction time 2 hours, normal atmospheric temperature, after reacting the pH in solution being adjusted to be 11 by lime milk. The experimental results showed that following chemical coagulation/micro-electrolysis process, the removal rate of chromaticity is 100%, CODCr could be reduced to less than 150mg/L and the treated wastewater can come to the first and the second discharge standard of state comprehensive discharge criteria GB8978-1996. The analytic result shows that lixivium from solidified sludge cake of per unit operation comply with the second kind of general industrial sold of state standard for pollution control on the storage and disposal site for general industrial sold,GB18599-2001.
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