The Technology Research And Design Of New Contact Oxidation Devices On The Advanced Treatment Landfill Leachate By Advanced Oxidation Process Of Ozone

Advanced oxidation process of ozone has great degradation efficiency to biorefractory organics, because of its high efficient degradation ability, and it can significantly increased the biodegradability of landfill leachate. This leads to that we can treatment the landfill leachate secondary effluent to reach the national discharge standard at a lower cost by coupling advanced oxidation technologies of ozone and biodegradation. Besides that, the advanced oxidation technologies of ozone has strong oxidizing, react quickly, and easy to modular management, etc. So it has got more and more attention and application in recent years.The treatment processing effects by ozone/hydrogen peroxide systems was experimentally studied at first. Then we take into account the experimental results, the efficient use of ozone in the contact reaction device and the coupling advanced oxidation technologies of ozone and biodegradation. The design concept of new contact oxidation devices was proposed, and in order to study its treatment efficient, the experiments have been done by the lab scale device to advanced treatment the landfill leachate secondary effluent. At the same time, the efficient use of ozone in the contact reaction device and the coupling advanced oxidation technologies of ozone and biodegradation were investigated. In this study, the main experimental conclusion is as follows:(1) There is a good treatment effect in landfill leachate secondary effluent by ozone/hydrogen peroxide systems. Under the optimum operating conditions, which contact time is 30 minutes, initial pH is 8 and the dosage of hydrogen peroxide is 1mg/L, the ozone/hydrogen systems is able to remove 70.0% of chemical oxygen demand(COD), 74.5% of UV254 and 91.0% of colour. And this system could increased the leachate 5-day biochemical oxygen demand(BOD5) to COD ratio from 0.01 to 0.28, the biodegradability has a significantly increase.(2) The experimental results by the new ozone contact reaction device show that: the ozone utilization efficiency can increase by an average of 10.8% by reusing the residual ozone in exhaust gas. Moreover, the ozone utilization efficiency can also increase of 8.1% by optimizing the ozone dosing ratio of each contact oxidation chamber. The increase of ozone utilization efficiency has very important economic significance, because the manufacturing cost of ozone is the main operating costs in the advanced oxidation technologies of ozone.(3) In order to verify the coupling condition of advanced oxidation technologies of ozone and biodegradation, the biodegradability and the dissolved ozone concentration in the effluent water were detected. The experimental results by the new ozone contact reaction device show that: Synthetically considering the operation cost and under the suitable water inlet velocity, the biodegradability could have a significantly increase, and can basically meet the requirements of follow-up biological treatment; the dissolved ozone concentration in the effluent water could romove over 94%. In consideration of ozone decomposition characteristics, the new contact reaction device can significantly reduce the adverse impacts on the subsequent biological treatment and ensure that biological treatment going well.