The Hydrodynamics And Structural Characteristic Of Electro-catalytic Oxidation Reactor

Three self-designed electro-catalytic reactors were been used for adjusting the hydraulic retention time. The first reactor is approximately ABR-type reactor, the second is a horizontal plug flow reactor, the third is the sub-region reactor. First, by adjusting the hydraulic retention time and plate distance, respectively, water conductivity and chloride ion concentrations were measured. The experiment result proved that at the space between poles of 3cm,the E (t)-t curve is close to skewed normal distribution. When the HRT is 30 minutes,the reactor flow pattern is the most stable. When the space between poles is 1-3cm and the current density is 20mA/cm2, the E (θ) curve is close to the hydraulic retention time. And when the plate spacing is fixed at 3cm, the peak of the E (θ) curve is close to the actual hydraulic retention time of 30min. The HRT is 40 minutes, the water is nearly totally mixed.Based on the best conditions of the space between poles and the hydraulic retention time, the study on the different reactors found that the RTD curve of first reactor corresponding to the peak time is around 24min, and the RTD curve of first reactor corresponding to the peak time is around 27min, and the RTD curve of first reactor corresponding to the peak time is around 30min. The third reactor is more close to the actual set of circumstances, the third reactor design superior to the first two. The second model simulation is the best of three kinds of of the reactor. The model of the experimental data fits best.In the different HRT and different electrode spacing conditions, the water of 50% was returned, it is measured that the tracer concentration change was decreased. Water reflux can increase the water contact time with the electrode plate.When the current density is 20mA/cm2, electric field accelerates the water molecule movement speed, temperature differences of the water which near plate increased, and the water flow has been enhanced. Two electrodes produced gas driving water circulation, and increased the time of water contact with the plate.By the orthogonal test of mean residence time and variance formulas, it is found that the most of affecting retention time factors is retention time,and then is plate distance and reactor., The fluid flow condition of the first reactor is close to plug flow. And the third reactor, close to completely mixed flow conditions. The second reactor of the condition is between the three reactors. The reactor channel flow was not obvious.When the plate spacing is 3cm and the hydraulic retention time is 30min, using the reactor to treat the wastewater,it is found that the concentration of COD,NH3-N is stabilized after 30min of reaction time. At the space between poles of 3cm, the hydraulic retention time of 30min is the best condition in the electro-catalytic oxidation experiments. Experiment using two anaerobic bioreactor to treat two different wastewater:wastewater was treatment by electrocatalytic oxidation and wastewater was not treated. The results showed that the wastewater biodegradability has been improved through electro-catalytic oxidation treating. The microorganisms have a strong adaptability to replace.