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Study of Diketene, Acesulfame-K Wastewater Treatment Process Operation Evaluation and the Optimization of Pretreatment Process

Author: XueZhangHui
Tutor: LiYong；ChenXiaoPing
School: Suzhou Institute of Technology
Course: Environmental Engineering
Keywords: Chemical wastewater Iron- carbon micro electrolysis Fenton oxidation Coagulation and sedimentation
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 30
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Abstract


Diketene acesulfame potassium and its raw material production wastewater, water quality ingredients, complex, high content of organic matter, nitrogen and phosphorus, poor biodegradability. Currently, fewer domestic processing of such wastewater. In this study, the problems that exist in a diketene (Acesulfame) production wastewater treatment process, as the main process of micro-electrolysis Fenton oxidation pretreatment optimization test program. Alone and the combination of the run-time control parameters by single factor test and orthogonal test each process is optimized; eventually come to the best combination of the wastewater pretreatment process. Pursuant to which the chemical plant wastewater pretreatment the proposed transformation recommend and engineered preliminary budget investment and pharmaceutical costs. This study is divided into three phases, the first phase investigated the actual operating parameters of the process of the wastewater treatment station, through the analysis of each processing unit pollutant removal efficiency obtained actual operation. The second stage by the laboratory static tests investigated the iron-carbon micro electrolysis and Fenton oxidation, coagulation and sedimentation COD removal. The third stage of the study the effect of different combinations of the three processes of wastewater treatment to determine the optimum operating parameters of the combined process. The research results show that the quality of the iron-carbon ratio of 1.5, influent pH value of 2.5 to 3, the working conditions of the reaction time 2h microelectrolysis average COD removal efficiency of 45%; effluent COD 449 ~ 981mg / L between; H 2 O 2 dosage of 1.5 mL / L 300r/min strength stirred reaction 40min Fenton oxidation, the COD removal efficiency can be increased by 15% ~ 20% of the effluent COD in the range of 298 ~ 807mg / L; coagulation test, a separate dosing PAM precipitation can achieve better results, at a pH of 7 to 8, and the dosage (anionic) 1.5mL / L, 100 ~ 120r/min stirring under the a 2min best reaction conditions, and on the the COD further removal of the effect is not obvious. On the basis of single-factor test by orthogonal design the optimal control parameters of the different combinations. The results show that the optimum operating conditions for the micro-electrolysis-Fenton oxidation - coagulation Process: micro-electrolysis reaction at pH 2.5, and the reaction time 120min, H 2 O 2 ( 30%), the dosage of 1.5ml / L, reaction time 60min, anionic PAM (1 ‰) dosage of 1.5ml / L; The direct flocculation process of raw water, the optimal reaction conditions: PFS (10%) dosing amount of 1.0 ml / L, cationic PAM dosage of 1.5 ml / L, stirring intensity of 100r/min, stirring time of 5min; the H O 2 strengthen the iron-carbon micro-electrolysis reaction, H 2 O 2 dosage on the removal rate of COD, TP greatest impact. The optimal reaction conditions: pH 2, H 2 O 2 Dosage 2mL / L, reaction time 90min. The combined process is run in the best parameters analyzed by the results of 15 consecutive days, the iron-carbon micro electrolysis-Fenton Reagent - coagulation and sedimentation joint process of the organic wastewater treatment effect best, COD removal rate can be maintained 55% TP removal rate reached the NH 3 -N removal of most of the time is negative, this is because the nitrogen-containing organic compounds of the raw water is generated after processing the partial oxidation of NH 3 -N. This combination of technology required for the transformation of low-cost, stable operation, creating good conditions for subsequent biological treatment. This study provides a theoretical and practical reference for similar wastewater treatment process design.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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