Research On Treatment Of Wastewater Containing Cu²⁺ And Dimethyl Phthalate By Fenton Oxidation Coupled With Flocculation

A variety of industry factory always coexists in industrial park, so there are various kinds of industrial wastewater with complex composition were generated, some kinds of wastewater may contain heavy metal ions, and some other may contain the refractory organics which are toxic to microorganism, especially some complex industrial effluent contains heavy metal ions and refractoy organic matters simultaneously. Not only processing step was increased, but also cost more if the heavy metal ions and organics were treated separately. It is a trend that various industrial wastewater is mixed together for treatment in the future, because of its lower investment and operation cost, high efficiency and based on waste control by waste. Therefore, fundamental purpose and research direction of this paper aim at removing heavy metal ions and organic matters simultaneously, the optimal technological parameters and reaction mechanism of this mixed industrial wastewater are also explored.Due to the pearl river delta region is a concentration of light chemistry and electronic processing industries, there are high concentration of Cu²⁺ and phthalates in effluent, hence this paper focus on heavy metal ions Cu²⁺ and refractory dimethyl phthalate（DMP） which is a kind of endocrine disruptor, making an series of experiments treat simulation wastewater containing Cu²⁺ and DMP by Fenton Fenton Oxidation Coupled with Flocculation, aiming at a process can simultaneously degrading DMP and precipitating Cu²⁺. The parameters affecting the total process, such as dosage of Cu²⁺, dosage of H₂O₂, molar ratio of H₂O₂:Fe²⁺, p H,dosage of Ca（OH）2 and dosage of PAM, were determined by using a mass of jar test experiments, and the reaction mechanism was preliminarily explored in this study.Through the research finding following conclusions:（1） The overall removal rate of DMP and Cu²⁺ reached 100% and 92.7%,respectively, at 10 mg/L Cu²⁺, 499.5 mg/L H₂O₂, H₂O₂:Fe²⁺ = 4:1, 600 mg/L Ca（OH）2 and 2 mg/L PAM.（2） Cu²⁺ is not only a kind of contaminant, it need to be removed, but also a catalyst can accelerate the Fenton-like reaction efficiency; the couple of Ca（OH）2+PAM was slected as the optimal flocculating agent combination, the combination of easy to use, cost- effective and can be applied in treatment of actual industrial effluent.（3） Through a research on the oxidation mechanism of DMP degration by Fenton under given research system, it can be found that the hydroxyl radicals can be confirmed as one main factor influencing the DMP degradation with its strong oxidizing property and electrophilic reactivity, it can attack on benzene ring firstly which leads to different intermediates were generated.（4） This study is a preliminary exploration about the reaction mechanism of Fenton-flocculation for synchronous Cu²⁺ and DMP removal in the condition that Cu²⁺ and DMP coexist. The research findings will contribute to treating industrial wastewater containing Cu²⁺ and DMP, and even the wastewater containing other heavy metal ions and organics, it also contribute to understanding the reaction mechanism of Fenton-flocculation process to treat the complex industrial wastewater which contains refractory organics and heavy metal ions. It lays the foundation for exploiting a new technology to treat this kind of complex wastewater.