Research On The Treatment Of Oily Sludge In Liaohe Oil Field

Gas floatation has already become the necessary technics in the viscous oil produced water treatment process and the output of floating sludge increased particularly. Currently 5.8×104m3floating sludge was produced every year,comprised water(97%), secondary mineral(2%) and petrolum(1%). Among them resin and bitumen are dominating oil component. No efficacious technics could be applied to the sludge treatment so far and this thorny problem on the environmental protection floored the Liaohe oil field. Six kind of floating sludge sampling from 6 produced water treatment station was investigated. Based on the analysis results, treatment methods were applied, such as reverse flocculation, pressure filter and rotary hearth incinerator. Results were as follows:(1) Petroleum, secondary mineral and water agglomerate and form floating sludge. So the sludge was viscidity and the components could not be separated easily. The physical construction and surface character lead to the special interface attribute and deoil difficulty. So the deconstruction of floc is essential for the floating sludge treatment.(2) The stability of sludge depends on the structure of floc. It is necessary to destroy the framework of floc. In the experiment, physical, chemical and dynamical measures were taken to break the floc. The results showed that the reverse flocuation is the necessary pretreatment. Water could separted from the floc after its deconstruction.(3) Pressure filter is still the most effective path to reduce the volume of sludge. the process of reverse flocuation-sludge thicking-presure filter could decrease the water concerntration below 80% and reduced the volume to 1/10-1/8.(4) Batch refuse incinerator and rotary hearth incinerator were applied in this study.Industry pilotting experiment show that sludge could be treated by incinerator safely.