多通道网状电极电化学预处理垃圾渗滤液反渗透浓缩液

反渗透(Reverse Osmosis,RO)因出水水质好、运行成本低等优势常用于垃圾渗滤液的处理,但产生的RO浓缩液具有COD高、色度高、盐分高、难降解等特点,其处理存在效果差、能耗和成本均较高等问题.本工作采用氧化钌/氧化铱涂层电极(RuO2/IrO2-Ti)的钛网为阳极,以304不锈钢电极为阴极,设计制作了 6通...

Electrochemical pretreatment of landfill leachate RO concentrate with multi-channel mesh electrodes

Reverse osmosis(RO)is widely used in the treatment of the municipal solid waste leachate because it has the advantage of high quality of treated effluent,low running cost,etc.However,the concentrate produced during the RO process has high COD,high color,high salt content and is extremely hard to be degraded.At present,the treatment of RO concentrate is rather costly,low efficient and high energy consumption.In order to solve these problems,a novel electrochemical treatment process of RO concentrate in a homemade six-channel electrochemical reactor with the RuO2/IrO2 coated titanium mesh anodes and the 304 stainless steel plate cathodes were proposed.The effect of operation parameters of the current density,liquid circulation velocity and specific electrode area on COD removal was investigated.The degradation mechanism of the refractory organics and the energy consumption of the electrochemical oxidation process were also analyzed and calculated.The results show the COD,TOC and salt removal efficiency was 68.0%,40.6%and 72.1%respectively after electrochemical treatment for 3 hours under the optimal conditions of current density of 32.89 mA·cm^-2,liquid circulation velocity of 0.46 cm·s^-1,and the specific electrode area of 65.1 m²·m^-3.Compared with the conventional electrochemical treatment process using plate electrodes,the per kilogram COD removal energy consumption of the proposed electrochemical process is only 25.5%of the former one.Therefore,this work could provide an alternative choice for the pretreatment of landfill leachate RO concentrate.