| Sanitary landfill is one of the main process of the municipal solid wastes(MSW) treatment.Landfill leachate is a kind of organic wastewater producing during the course of rubbish landfill,which presents significant variations in both volumetric flow and chemical composition.It contains large amounts of organic pollutantsandammonia nitrogen.Landfill leachate in the late can be treated difficult because of low C/N and bad biodegradability. At present, biochemical method + membrane treatment is the most effective treatment method for landfill leachate. The quality of sffluent water can meet the emission requirements, but it will produce another by-product concentrate.Garbage concentrate is processed more difficult because of vast refractory organic and inorganic pollutants, which is difficulty and research focus in the field of environmentrate pollution control.Advanced oxidation technology is one of the more effective ways of dealing with the concentrate. As a kind of advanced oxidation technology, e lectric catalytic oxidation is a highly efficient water treatment method to degrade organic matter, which is produced through direct oxidation of anode or strong oxidizing substances among the indirect oxidation. It has the advantages of no secondary pollution; strong processing capacity and mild reaction conditions.C urrent studies of electrochemical oxidation treatment of concentrate are still in the start stage. The relevant theory is not perfect and the design basis is not sufficient. The research develop of electrochemical oxidation treating concentrate. First of all, the test analyzes the nature of the concentrate in order to understanding the feasibility of electrochemical treatment. Secondly, the test selects the best anode material through treating concentrate by electrochemical oxidation. Finally, the test uses the optimization of anode material to treat concentrate, which can ascertain the operation parameters, so as to provide reference for concentrate treatment by electrochemical oxidation. Through experiment it is concluded that the the following results:1)Thetest analyzes of the conventional water quality index of five waste plant concentrate. Results indicate that the concentrate p H is between 6~8, in the suitable p H range of electrochemical oxidatio n; The value of conductivity is scope of 8.5m S/cm~47.68 m S/cm;CODconcentyation is above 500mg/L, and do not have to biological; The chloride ion concentration is more than 1000mg/L, which is advantageous to electrochemical oxidation.2) Thetest usedfour electrode materials of stainless steel、Pt/Ti、Ir O2-Ru O2/Ti and Sn O2-Ru O2/Ti to treatment concentrate.The results showed that Ir O2-Ru O2/Ti electrode has the best treatment effect.Under the condition of 15 A/dm2, chroma and COD removal rate was 84.21% and 89.55% after electrolytic 6 hour; the humic of concentrate is completely removed after electrolytic 2 hour; NH3-N can be completely removed after electrolytic 6 hour.3)Thetest processes garbage concentrate using Ir O2-Ru O2/Ti electrode as anode and stainless steel as cathode. The results show that: the optimal conditions using Ir O2-Ru O2/Ti electrode for treating NF garbage concentrate are current density of 15 A/dm2, 1cm plate spacing, not adjusted the original p H. After 5 h electrochemical oxidation, ammonia nitrogen and total nitrogen removal rate reached 100%; the removal rate of COD and chromaticity is respectively 89.47% and 82.09%. The corresponding current and unit energy consumption are 56.95% and 75.30 k Wh/kg COD. The change of COD concentration is in line with the first order kinetics equation: ln C=-0.00726t+8.47, correlation coefficient R of 0.9876. On this condition, it can make the concentrate of BOD5/COD ratio increased from 0.0015 to 0.35, which can beeffectively usedwater biological treatment processing for the subsequenttreatment. |
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