The Mechanism Study And Method Of Extended Silicon Removal In Heavy Oil Produced Water

The removal of silica for the heavy oil wastewater has been a major problem to the heavy oil production areas.High water temperature,high suspended solids content,and high organic matter content consist of the most significant characteristic of heavy oil wastewater,which seriously harms our environment,so to avoid the disadvantages and forwaterrecycling the treated heavy wastewater is always applied to reuse into thermal recovery boilers.However,silicon removal process is normally difficult,and inpouring treated heavy oil wastewater that is up to standard can led to forming silica scaling in the thermal boilers and steam-injection pipes.Therefore,it's important and importunate to study the forming mechanism of silica scaling and filter out the most efficient chemical silica agents.In this pape,Shuguang Oil Production Plant of Liaohe heavy oil sewage addition to silicon processing research,the active silicon and silicon two methods jointly as a method for the determination of silicon content and improved.The sewage silicon active silicon and non-reactive silica two categories.Firstly,this article examined the changes of silicon content and the formation of silica scaling in the wastewater under different temperature,pH,and ion contend,which helped to raise and determine the forming mechanism of silica scaling by the study method that divides the silica into active silica and non-active silica.Then,MgO and PAC were chosen as the best silicon removal agent through lots of sieving experiments,and the optimum mixing proportion was defined as 3:1(mass ratio).Finally,the paper summarize the silicon removing mechanism of MgO and PAC by means of experimental phenomena and microscope photos.Experimental results showed tha:temperature,pH and ion content and many other factors affect the complex changes in the content of silicon and silica scale generated.The impact of temperature on the active silicon,and the impact of the non-active silicon,a large number of non-active silicon into a state of active silicon molecules or ions;ThepH value of the active silicon and non-active silicon:active silicon chemical equilibrium in aqueous solution with the polymeric form;The non-reactive silicon mainly affect the morphology of the non-active silica and its transition to the rate of the active silicon;The active silicon under the pH conditions,the type of polymerization mechanism;metal cation impact of changes in the content of silicon and silica scale formed from multiple perspectives.Heavy the silicon matter in wastewater contain active silica and un-active silica;There are at least three forming mechanism of silica scaling in wastewater,which led to three kind of silica scaling;Running at 80? under permanent stirring foe 1h,MgO mixed with PAC by 3:1 performed best,and at 400 ppm,the content of active silica was 35.12mg/L,while the total silica was 44.41 mg/L,which has been up to the common standard(less than 50mg/L);All in all,the respective function mechanism of MgO and PAC,and the mechanism of their compound were concluded.