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Studies On Polysilicic Acid-polyferric Flocculant For Papermaking Wastewater Treatment

Posted on:2009-06-27Degree:MasterType:Thesis
Country:ChinaCandidate:S A SuFull Text:PDF
GTID:2131330332481473Subject:Environmental Science
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Papermaking industry drained away lots of waste water during the process of production which was harmful to the living environment of animals and plants lived in the water, it also destroyed the value of water resource's utilization. We had mature methodology of dealing with the waste water in our county, but there wasn't a better way to deal with the poisonous water. The high efficiency coagulant wasn't produced yet which made the efficiency was very low because it was difficult to avoid the second poisonous after putting into water treatment agent, so the water treatment agent with high efficiency and no pollution was needed to develop urgently with the purpose of dealing with the waste water.After experiment, the effect of dealing with waste water of FPAS was better than the effect of PAC, PAFC, PFS and FPAS. Through the research, it showed that FPAS, it either had strong electrical neutralized ability, or had superior flocculerit effect, it was a very good high molecular compound flocculent which the treating ability was better than major usual agent and the treated cost was only 70~80% of them. It proved that FPAS was a suitable flocculent for treatment of papermaking waste water. And researched PAM, poly propionamide, activated silicate coagulant aids. Paper discussed utilization of justify affect in sewage treatment, PAM and FPAS cooperative effect were best of all, the waste water which after treating got the national 3rd standard. The results of experiment showed that single water treated agent was more effect and economic.Experiment about 6 different FPAS concentration for treating papermaking waste water, through the experiment, the best quantity of adding about FPAS and PAM were decided in different concentration, to COD,BOD,SS, the lost rate could get 75%,70%,80%,the out water's quality could get the 3rd standard, the cost was only 70% of others, it told us FPAS was a kind of high effect and cheap treated agent for papermaking waste water.Through doing experiment about different pH, the method of adding, stirring endeavor and time factors effect, the results showed that, pH, the method of adding, stirring endeavor were the important factors which can affect FPAS ability. Through experiment, the best was pH7-10,the best stirring method was divided two step, firstly added FPAS as 150r/min speeding to stir for 5 min, then added PAM as 100r/min speeding to stir. Under this condition, the rates removal of COD and SS were 85% and 81%.Lastly, to the trait of papermaking high concentration, summarize the research result and experiment, the paper evade corporation with flocculent and biologic treatment, and lively research the effect of FPAS and activated soil complex for treating papermaking water, the result fact used it with very good effect, and save flocculent quantity largely. In the experiment, discussed relation of pH and microbial live situation affect the result of waste water treatment easily and pH=7, through the biological treatment the out water's COD, SS got to 96%,95%, it was national 2nd standard.Summarized follows, FPAS was a kind of new style, high effect, complex high molecular flocculent, and justify with PAM could treat papermaking water effectively.
Keywords/Search Tags:Paper making, waste water, flocculent, coagulant aids, synergistic effect
PDF Full Text Request
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