Experiment Research On Treatment Of Polymerization Unit Wastewater Of Acrylic Fiber

China is the world’s largest producer of acrylic fiber, its production of the world’s total output of1/3, acrylic production process wastewater generated by water due to its complexity, toxicity, and become a major problem in the field of water treatment. Acrylic high concentration of pollutants in wastewater, N/C high, toxicity, and high levels of toxic pollutants caused by poor biodegradability. And organic pollutants in their wastewater mainly phenols, alcohols and organic nitrile. So, how to take reasonable and effective method of acrylic fiber wastewater pretreatment is not conducive to biochemical reactions to reduce the concentration of organic matter, to ensure the efficient operation of the subsequent biological treatment, it is very crucial.With China’s increasing production scale acrylic, acrylic fiber wastewater emissions is also growing, but for the production of acrylic polymerization units produced water, very little current research, nor to develop a relatively mature technology. Polymerized units of organic wastewater, high content, so before polymerization unit wastewater into the biochemical system, the need for physical and chemical pretreatment.The object of this paper is composed of acrylic fiber wastewater maximum amount of water, waste water worst polymerized units. For the polymerization of acrylic wastewater generated in the production, currently little research, there is no development of a relatively mature technology. Polymerized units of organic wastewater, high content, so before polymerization unit wastewater into the biochemical system, the need for physical and chemical pretreatment, this paper studied through experiments with different physical and chemical pretreatment unit for wastewater treatment effect polymerization. In order to better deal with acrylic fiber wastewater provides technical support and theoretical basis.(1) Iron-carbon micro-electrolysis experiments, pH=4, the iron-carbon mass ratio of1:1, iron dosage of30g/1, HRT is90min, the reaction is the best, and the three factors for iron-carbon order of micro-electrolysis treatment of wastewater COD removal effect sizes for pH, iron-carbon mass ratio and reaction time. Optimization level combination A3B2C1, namely pH=5, the iron-carbon mass ratio of1:1, the reaction time was60min., COD removal rate was32.28%.(2) Coagulation tests, the initial pH of8, the slow mixing time of10min, stirring intensity50r/min, coagulant dosage of300mg/1, the best effect, three factors for coagulation impact on COD removal order of coagulant dosage, reaction time, pH. Optimized combination A1B2C2, that is, when pH=3, coagulant dosage of200mg/1, the reaction time was60min, the removal rate of COD, reached34.33%.(3) Fenton advanced oxidation experiments, Fenton reaction polymerization unit processing wastewater, COD removal factors on the size of the relationship is: H2O2dosage, reaction time, initial pH, Fe2+dosage, the optimal combination of conditions to A3B2C1D3, that Fenton oxidation process wastewater acrylic polymerization unit optimal conditions:H2O2dosage of0.2mol/1, Fe2+dosage14.4mol/1, initial pH2.5, the reaction time was150min, this time COD removal efficiency reached55.70%.(4) In the course of biochemical reactions carried out gradually, as the reaction proceeds, the molecular weight distribution of organic matter in the wastewater is also changed, and only in the range of10k-30k and3k-10k, the waste organic matter in a decreased proportion of, on the other molecular weight distribution range, its proportion has increased, indicating that the biochemical reaction process, molecular weight distribution range of different organic compounds are also on mutual transformation, thus destabilizing the effluent COD.(5) Removal of various methods and their corresponding molecular weight distribution of the water remained the same, and Fenton, and coagulation are two methods for removal of organic high>100K’s, Fenton method is to reach100%, the removal rate of coagulation78.88%. The results showed biological pretreatment biological treatment of organic matter treatment effect was not significantly different molecular regularity.