Advanced treatment of drilling wastewater by electrocatalytic oxidation with lead dioxide anode
WANG Sheng-han1, WU Xin-yi1, CHEN Cai2, PENG Xu3, WANG He-ming1
1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering and Environment, China University of Petroleum(Beijing), Beijing 102249, China;
2. Nanyang Oilfield Tenglong Industrial Co., Ltd, Nanyang 473132, China;
3. Henan Petroleum Exploration Bureau of China Petrochemical Corporation, Nanyang 473132, China
In this study, two typical actual drilling wastewaters (slurry tank supernatant and slurry plate and frame filter effluent) were pre-treated to obtain four types of electrocatalytic influents:slurry tank supernatant diluted sample (water sample 1), slurry tank supernatant flocculation treatment sample (water sample 2), slurry tank supernatant flocculation air flotation treatment sample (water sample 3) and slurry plate and frame filter filtrate diluted sample (water sample 4). The double cathode electrocatalytic system was constructed with titanium-based lead dioxide (Ti/PbO2) as anode, to perform advanced treatment of the above four types of water samples (influent COD range:95.58~131.7mg/L) in order to explore the electrocatalytic removal of drilling wastewaters. The results showed that the organic pollutants in drilling wastewaters could be efficiently and non-selectively removed by electrocatalysis. The highest COD removal efficiency of water sample 3 reached 84.31% after 40 min of treatment. The effluent ammonia nitrogen and total nitrogen concentrations of water samples 2,3 and 4decreased significantly, but the turbidity increased. This may be because the presence of chloride ions improved the removal efficiency of ammonia nitrogen and total nitrogen, and aluminium ions contributed to the formation of hydroxyl complexes.
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