Research On The Preparation Of Polymer Solution By Using Domestic Sewage After Deep Treatment

With the rapid development of economy and society, the demand for water resources is increasing year by year.Our country has abundant water resources, ranking sixth in the world. However, because of China’s population base being too large, and also being the most populous country in the world, therefore, the amount of per capita possession of water resources is very low.In one word, Our country ranks one of the13countries in the world,with the shortage of water resources. In addition, the water resource of our country has its own characteristics, the uneven distribution of time and space. There exists serious inconsistency in the the spatial distribution of water resources and the development of regional economic.As a result, the status of water resources shortage will seriously restrict the rapid economy development of our country.Due to the rapid development of the tertiary oil recovery technology, its using scale is also growing.And the demand of water consumption also gradually increases, which further aggravates the situation of water shortage. Therefore, the domestic sewage needs to be deeply treated, turning the waste to treasure, instead of clean water for oil recovery, to meet the requirements of the preparation of polymer solution in oil fields. This method can not only alleviate the situation of the shortage of water resources, but also bring greater economic and social benefits.This subject takes domestic wastewater as the research object,and analyze the water quality to determine the main factors influencing the properties of the polymer solution.There is three different kinds of treatment methods,that is:traditional advanced treatment process; UF advanced treatment process; united UF with ion exchange resins advanced treatment process. The analysis and comparison are made for effluent water quality of of the three methods, using the different effluent to prepare polymer solution.Then, the value and stability of viscosity and the anti shear properties of different concentrations and different molecular weight of polymer solution is measured. At the same time, it needs to be compared with the clean water system for investigating the feasibility used in place of clean water.The water quality analysis of raw water shows that the water salinity value is less than1000mg/L.And the effect of salinity on viscosity is negligible. At this point, The viscosity of the solution is mainly influenced by ion concentration. Further tests show that the viscosity of the HP AM solution is mainly affected by Ca2+, then Mg2+. The concentration of Na+and K+also has a certain impact on the viscosity of the HPAM solution, but compared with Ca2+, Mg2+, the effect is greatly reduced.The effluent water qualities of the first two treatment processes show that the concentrations of Ca2+and Mg2+have certain removal efficiency. And the removal rate is low, mainly depending on the process of coagulation reaction. As a result, the removal efficiency is not obvious.The removal rates of the first treatment process are:27.51%,30.65%, and the second’s are24.87%,27.90%. Compared with raw water, although the effects of coordination polymer preparing with the effluent of the first two treatment processes have been improved, there is still a large gap when to be compared with clean water system.Therefore, the effluent water cannot directly replace clean water. Adding cation exchange resin in processing device, Ca2+and Mg2+are well removed, and the effects are obvious.The removal rates are:89.76%,51.05%. At this time, the content of Ca2+and Mg2+in the treated water are very low, and their effects on polymer properties of the solution are also greatly reduced. Through the analysis of the viscosity of HPAM solutions with different molecular weight and concentration, we can make a conclusion that the polymer properties is much better than the raw water system, as well as being close to clean water system. So the effluent water of cation exchange resin can be used in place of clean water.This paper also studys the pollution situation of ultrafiltration membrane and cation exchange resin. The results show that the ultrafiltration membrane’s transmembrane pressure is growing fast during the early operation, and then become slowly. Analysis of scanning electron microscopy shows that the membrane surface pollutants are well removed after chemical cleaning. The testing result of the polluted resin’s physicochemical properties shows that the resin particles are not broken and the color is deepened. The moisture content is47.44%, which is still in the allowed range. Compared with fresh resin, exchange capacity becomes smaller. While the total exchange capacity of fresh resin is4.4mmol/g, polluted resin’s total exchange capacity is decreased to3.64mmol/g, strong acid group exchange capacity is3.27mmol/g, and weak acid group exchange capacity is0.37mmol/g. If continue to use,the polluted resin needs to be regenerated. After regeneration, the total exchange capacity of resin is4.51mmol/g.