Research And Improvement Study On "SBR" Technology Treating The Leachate Of Landfill

The Leachate treatment methods improve greatly in the recent years. Based on the systematic analysis of the new research results on the Leachate characteristics and its treatment methods at home and abroad, the author come to relize that the pinch point of treatment is the inconstancy of the Leachate in content and characteriesics. In the different period of the landfill, the most fitful leachate treatment technology is different. It is convinced that the leachate treatment process developed from removing the heavy metal CODcr and TN unilateral to broaden the treatment range at the Same time .That is to say, it put forward higher requirement on the selection of the treatment process.Biological reactor stands up the future of the garbage treatment, which transfer the landfill from a passive acceptance system to a agent management system. The author select a technology combined the ammonia stripping pretreatment ,ABR and SBR to treat the later period leachate of the Zhong Shang landfill, and take this technics as the continue graranted technology of the biological reactor.In the ammonia stripping course, it was studied on the confirmation of the best PH and the dosage of lime, and the change rules of the NH4+-N, PH and akialinity followed the stripping time, and the other influence factors. The results showed that the best PH is 10.5 and the best dosage of lime was 9mg/L, and when the room temperature was 25℃ , controlling the ratio of the water to 3100~3900, about 95% of ammonia removal could be obtained.In the SBR treatment course, it was studied the ability of the removal of the CODcr and the nitrogen from four sides such as the cultivating bacterium, tradition SBR treatment, single grade A/O model SBR treatment and the double grades A/O/A/O model SBR treatment. The research analysed the change rules of the NH4+-N, alkalinity, PH, DO and CODcr in a cycle. The results showed that the double grades A/O/A/O model SBR treatment have the apparent function on Nitrification and Denitrification, and have better funcation on the removal of CODcr than the other treatment system. Then the SND experiment confirm thepossibility that the SND technology can be applied in the tradition SBR treatment. And the results showed the best DO is between 0.5 ~1.0 mg/L and the best PH is between 7.5~8.5.Artificial wetland can treat leachate economically and effectively, which guarantee the treatment effect.At last ,the author suggested a new treatment technology which is composed of biological reactor, ammonia stripping, ABR, SBR, flocculation. The paper also analyses characteristics, investment and operation cost of the new Process.