蒽醌修饰石墨毡电极预处理头孢合成废水

以钛涂钌电极为阳极、自制蒽醌修饰石墨毡电极为阴极,对头孢合成废水(COD=25 000~30 000 mg/L、ρ(NH3-N)=850~1 300 mg/L、色度为2 300~2 680度)进行了电化学氧化预处理,优化了电解条件,并对电化学体系的动力学和稳定性进行了分析。实验结果表明:蒽醌的存在可改善电化学氧化降解效果;在电解时间50 min、电流密度0.14 A/cm2、Na2SO4浓度0.1 mol/L、极板间距2 cm、初始废水p H 7.0的条件下,废水的COD、色度、NH3-N的去除率分别可达45.3%,66.9%,33.6%;BOD5/COD由处理前的0.27增至0.40,可生化性得到改善;COD、色度、NH3-N的电化学氧化降解过程均近似符合一级动力学方程;且该电化学体系的应用稳定性良好。

Pretreatment of Cephalosporin Synthesis Wastewater with Anthraquinone-Modified Graphite Felt Electrode

The cephalosporin synthesis wastewater with 25 000-30 000 mg/L of COD,850-1 300 mg/L of ρ（NH₃-N） and 2 300-2 680 degree of chroma was pretreated by electrochemical oxidation using Ti/RuO₂ electrode as anode and self-made anthraquinone-modified graphite felt as cathode. The electrolysis conditions were optimized and the kinetics and stability of the electrochemical system were investigated. The experimental results show that：Anthraquinone can improve the electrochemical degradation effect;Under the conditions of electrolysis time 50 min,current density 0.14 A/cm²,Na₂SO₄ concentration 0.1 mol/L,electrode distance 2 cm and initial wastewater pH 7.0,the removal rates of COD,chroma and NH₃-N can reach to 45.3%,66.9% and 33.6% respectively;The biodegradability of the wastewater is improved with BOD₅/COD increasing from 0.27 to 0.40;The electrochemical degradation processes of COD,chroma and NH₃-N accord with first order kinetic equation approximately;And the application stability of the electrochemical system is good.