Research On Synthesis And Application Of Pharmaceutical Product Of Water Treatment For Oliy Wastewater

With the pollutants produced by the development of oily industry increasing rapidly, the environment has been polluted seriously. So the treatment technology for oily waste water has been an important topic at home and abroad. The method of flocculation has advantages of low investment cost, simple instruments and short treatment time, which is used extensively in oily wastewater treatment technologies. Inorganic Polymer-flocculants as it is untoxic, cheap and high effective, plays an important role in wastewater treatment, especially the development and application of many kinds of composied flocculants recently, which has enhanced the reaction efficiency of flocculation. In order to improve the shortcomings of traditional technics for synthesizing polyaluminium chloride, combined with the actual conditions of the wastewater treatment plant of Lao miaojun oil field in Yumen, the industrial materials of the crystal of aluminum chloride and the calcium oxide were used to synthesize polyalumium chloride and then it was also be modified.In laboratory, the synthetic conditions concluded by orthogonality experiment and the method of Al-Ferron complex colorimetric, which include the choice of reacting temperatures, the choice of the ratio of materials, the conditions of curing temperatures and etc..The indexes for the product of polyalumium chloride contained the content of alumina, basicity, and the values of pH and etc. were also determined. Then the hydrolyzation and polymerization form of polyaluminium chloride and modified polyaluminium chloride are studied. And the effect of their synthetic conditions on the species distributions of aluminum was also researched. In order to confirm the best control indexes for the process of flocculation, composite polyaluminium chloride, modified polyaluminium chloride and polypropylene acyl amine (PAM ), chitosan. And adopt the method of beaker experiment to study the effect of the ratio of materials, the dose of flocculants and the value of pH on the efficiency of treatment for the oily wastewater.The research results showed that when the initial Al concentration is 2mol/L, the content of Alb(the sector of PAC and Ferron reagent reacted between 1min and 120min) is the most under the situation of the low ratio of materials. But when the ratio of materials is high and the initial Al concentration is 1mol/L, the content of Al_b occupies the main content. And the ratio of materials is so high that comes into being the deposition. Reacting temperature and curing temperature have great effect on thespecies distributions of aluminum for polyaluminium chloride. So when reacting temperature is 60°C and curing temperature is between 60°C and 65 °C, the content of Alb is high. And the content of Alb increases obviously with the basicity increased up to 70%. During this stage, the change of the species distributions of aluminum is from Ala( the sector of PAC and Ferron reagent reacted in lmin) to Alb. When the modulus of silicic acid used in the modified polyaluminium chloride increases gradually, the content of Ala is changeable but stable, while the content of Alb decreases and the content of Alc (the sector of PAC and Ferron reagent reacted after 120min) increases at the same time. Both the ratio of Al/Si and the polymerization time have great effects on the species distributions of aluminum of the modified polyaluminium chloride.Concluded from the experimental results, the synthetic conditions of polyaluminium chloride are followings: initial Al concentration is lmol/L, the ratio of materials is 1:1, and reacting temperature is between 60°Cand 70°C, curing temperature is between 60°C and 65°C. When the ratio of Al/Si is between 0.7—1, polymerization time for polymerized silicic acid is 90min and modulus of silicic acid is 2, which are all the fitting synthetic conditions for modified polyaluminium chloride. A 91.44% removal ratio of turbidity, a 54.99% removal ratio of BOD5 and a 47.46% removal ratio of COD can be attained after only using polyaluminium chloride to treat the oily wastewater. The removal ratios of turbidity, COD and BOD5 are 94.47%, 47.97% and 55.03% respectively by only using modified polyaluminium chloride. Both of their flocculation treatment efficiencies become higher after being composited by other flocculants. After the polyaluminium chloride composited by PAM, the removal ratios of turbidity, COD and BOD5can attain 94.41%, 51.63% and 26.00% respectively for treating oily wastewater. When modified polyaluminium chloride is composited by PAM, the removal ratios of turbidity, COD and BOD5 can attain 94.17%, 53.66% and 52.05% respectively after treatment. When polyaluminium chloride and modified polyaluminium chloride are composited by chitosan, the removal ratio of turbidity are 97.27% and 97.51% respectively, the removal ratio of COD are 56.91% and 60.98% respectively and the removal ratio of BOD5are 52.05% and 39.90% respectively.