| Reverse osmosis concentration, one of organic wastewater, is a refractory organic wastewater, which has complex composition, and contains high salinity, relatively low organic matter content, high hardness and poor biodegradability. It is very limited for conventional water treatment processes to treat RO concentrate. So exploring a new and effective way to solve the problem of organic wastewater RO concentrate is very meaningful.Pulse electrolysis is outstanding in many water treatment technology because of the strong ability to deal with pollutants, small equipment volume, no secondary pollution, etc.. However, if the improper electrolytic parameters is selected, the high power consumption might result in the industrial application of the technology bing difficult.Fenton oxidation technology has an excellent application prospect in dealing with the poisonous, harmful and difficultly biodegradable organic wastewater due to the simple equipment, mild reaction conditions, convenient operation and high efficiency. As a pretreatment method for organic wastewater, it can greatly improve the efficiency of processing and reduce the processing cost.Magnetic powder(Fe3O4) has a large surface area, and can strongly adsorb pollutants in wastewater. With the addition of magnetic powder to synergistically treat organic wastewater in the traditional water treatment technology in, some studies suggest that the CODCr and ammonia nitrogen removal rate is improved to a certain extent, and the transmittance of treated effluent is high. Improper recovery of magnetic powder, however, results in the excessive loss of magnetic powder and a rise of processing costs.Aiming at the advantages and disadvantages of the above-mentioned technology, this thesis studied a new type of multistage oxidation method, and a set of water treatment device, was manufactured to treat organic wastewater with using low-voltage alternating pulse power and synergetic technology of Fenton oxidation and magnetic powder. Thus the treatment efficiency of organic wastewater was greatly enhanced.The degradation rule of the fresh garbage leachate from a landfill in Wuhan city was studied with the synergetic use of various equipments such as the titanium electrode, alternating power, and so on. And the optimal parameters were obtained.1. Fenton reaction stages: when the wastewater was treated under the conditions of 2.3g/L of Fe3SO4·7H2O, 12.6 ml of H2O2, p H=3 in original Fenton reaction, p H=9 at the flocculation, 1 h and 25 ℃, the removal rate of CODCr and NH3-N was up to 59.63% and 44.35%, respectively.2. The synergetic stage of Fenton reaction and pulse electrolysis: when the wastewater was treated under the conditions of 18 V, 40%- 46 % of duty cycle, 1.5cm of plate spacing and 1h of electrolysis time, the removal rate of CODCr and NH3-N was 84.92% and 80.05%, respectively.3. The synergetic stage of Fenton reaction and magnetic powder pulse electrolysis: when the wastewater was treated under the conditions of 18 V, 40%- 46 % of duty cycle, 1.5cm of plate spacing, 1g of Fe3O4 before the electrolysis, 12 W of mixing pump and 1h of electrolysis time, the removal rate of CODCr and NH3-N was about 90%. The chroma was lower than 1000 degrees.4. The operation cost can be controlled within 20 yuan/T(RO concentration) with using the coupling technology of the Fenton method and the magnetic powder pulse electrolysis.In summary, the coupling technology of the Fenton method for the pretreatment and magnetic powder pulse electrolysis was efficient for the degradation of RO concentrate, and can be used as a kind of new treatment to apply in industry. |
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