含油污泥石油类物质两步法回收工艺试验研究

Study on Two-Step Process of Oil Material Recovery from Oily Sludge

针对某采油厂的含油污泥样品,采用热破胶相分离和气浮分离两步法回收石油类物质的工艺条件进行研究,获取了系统设计及实际生产所需的工艺参数。具体如下,将含油污泥用3倍质量水稀释后的混合液加热至80℃,调pH值6左右,加入占混合液质量分数0.4%的自制破胶剂,在缓慢搅拌下进行大约15～20min的热破胶相分离;石油类物质分离后的泥水混合液常温下再进行5～10min气浮除油,除油后的泥水混合物脱水得到泥饼含油率可达到1%以下;分离液循环回用于新的含油污泥稀释,分离效果良好。含油污泥除油脱水后泥饼土样种植三叶草.种子的萌发及枝叶生长正常。

In this paper, the quick hot breaking-emulsion and floatation separation process of oil material recovery from oily sludge obtained from an oil field was probed to obtain the essential parameters in the relevant engineering design or practices. The optimal process was as follows. Firstly, the mixture containing 25% oily sludge and 75% water was adjusted to a pH of 6, following by adding about 0.4% emulsion breaking agent, and then heating to 80~C under stirring slowly for 15 - 20 minutes. Secondly, at the room temperature, the major-oil-removed mixture was further treated by means of flotation for about 10 minutes in order to separate the residual oil. The oil content of the mud cake formed by the centrifugal separation of the last mixture was less than 1%. And the result that centrifugal separation mixture liquid for the next oily sludge treatment was great. Furthermore, the test result of planting clover on the soil sample composed of the dry mud cake and some seedbed soil showed that the seed germination and growth were normal.