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A Study on Pretreatment of Dimethoate-containing Wastewater and Wastewater in Synthetic Perfume Production by Electro-Fenton Method

Author: WuJinHua
Tutor: LiXiaoMing
School: Hunan University
Course: Environmental Engineering
Keywords: Electro-Fenton Pretreatment Rogor Synthetic perfume wastewater Degradation rule Biodegradability
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 261
Quote: 1
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Abstract


Pesticides, fine chemicals, industrial organic wastewater chemical oxygen demand (COD gt; 4000 mg · L -1 ), containing biochemical methods can not be degraded compounds (such as ammonia, polycyclic aromatic hydrocarbons, causing carcinogen benzo flowers), high concentrations of toxic and hazardous, biodegradable organic wastewater, the very large harm. Aquatic poisoning if not treated, discharged into the water bodies, crop failures, lead to various diseases. Traditional water treatment technology of high concentration of recalcitrant wastewater treatment is limited, it is very meaningful to study effective ways to solve the problem of sewage treatment. The traditional Fenton (Conventional Fenton, referred to as CF) method of Fe 2 in the reaction initially Jibei oxidation and slower reaction rate H 2 O 2 low utilization rate of organic matter mineralization is not fully treated water may be colored to some extent affected the promotion and application of the system. To this end, the research cycle electric-Fenton (Circulating Electro Fenton, referred to as the the CEF-FeRe) Act oxidative degradation process wastewater from the soundtrack fruit its impact factor mechanism. Required for H of the the CEF-FeRe reaction 2 O 2 by a peristaltic pump slowly added to the electrolytic cell, while the the oxidized Fe 2 is reduced at the cathode, the Fenton reaction can be ongoing. Dimethoate concentration of 200mg · L -1 , by more than one single factor test to determine the optimal CEF-FeRe reaction conditions for: room temperature, pH value of 3.0, H 2 O 2 / Fe 2 a molar ratio of 10, H 2 O 2 is added in an amount of the theoretical dose , constant current 0.5A. The results showed that the COD removal efficiency of 81.67% after 120min reaction conditions, dimethoate degradation rate of 99.4%. Through the determination of the CEF-FeRe CF reaction Fe 2 and H , 2 O 2 changes verify the CEF-FeRe reaction mechanism. The dynamics study results show that, The wastewater Rogor first order kinetic reaction law the CEF-FeRe reaction. In addition, through mineralization of dimethoate mineralization pathway analysis. Exploration and study of the actual synthetic fragrances Intermediate Wastewater (pretreatment of raw water COD 132580mg · L -1 ). Adsorption, coagulation, extraction method of wastewater treatment effect is not obvious. After a series of exploratory experiments and comparative experiment to determine the electrodialysis → flotation degreasing → electric-Fenton processing pathways. Identified in the I = 1.5A, the electrolysis time of 120min conditions electrodialysis effect is the best, the R value of 6.7322 x 10 -6 mol · mL -1 · cm -2 . Electrodialysis 3:00 flotation degreasing adjust pH, COD removal rate could reach 59.8%. The single factor experiment to determine the electro-Fenton reaction conditions: pH 3.5, the current of 0.75A Fe 2 dosage 3g · L -1 H 2 O 2 and Fe 2 a molar ratio of 10:1, and the reaction time was 75min. Electro-Fenton reaction under these conditions the removal efficiency of COD in waste water of up to 66.62%, the total COD removal efficiency of 86.60%.

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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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