Transportation and transformation of nitrogen in the full scale operation of two phase anaerobic system
The process in terms of nitrogen transportation and transformation in the wastewater treatment system is always the research focus. The nitrogen-existing forms of wastewater generated by monosodium glutamate processing factories and the effects of HRT, organic loading and biomass on the transportation and transformation of nitrogen in the full-scale operation of two-phase anaerobic process were to investigate in the present work. Protein and aminoacid, as the main nitrogen source of monosodium glutamate wastewater, were in the form of organic nitrogen. The predominant form of inorganic nitrogen was only ammonium in the system and the nitrate and nitrite were neglected due to the lower concentration. The ratio of ammoniacal nitrogen(NH4 + -N) to total nitrogen(TN) varied from 0.5 in acidogenic phase reactor (Phase I) to 0.85 in methanogenic phase(Phase II), which indicated that ammonium had already become the leading form in Phase II. The results showed a good correlation of ammonia-releasing amount with COD removal efficiency in Phase II, in contrast, no evident effect in Phase I. The ammonia concentration fluctuated relatively with the VSS value in Phase I, but it changed ruleless when VSS concentration increased gradually from 1000mg/l to 8000mg/l in Phase II. The ammonia-releasing amount varied greatly at different HRTs, especially the lower HRT of 15h in Phase I and 50h in Phase II, which the ammonia-releasing amount increased as the decreased HRT at 70 to 90 days of performance. The ratios of COD removal to TN removal (△COD/△TN) obtained from the heights of 3.0-5.0m and 5.0-10.0m were 22.2:1 and 12.0:1 in the reactor of phase II, respectively,which indicated that nitrogen loss far exceeded the maximum theoretical value of 50:1. The mean sludge concentration of these sections were 8943.3mg/l and 2698.7mg/l, especially in the height of 5.0-10.0m, the reduction of TN concentration was 244.5mg/l that was almost 45 percents of the total reduction in Phase II.
two phase anaerobic system nitrogen transportation transformation
Wei Wang Hongjun Han Wencheng Ma Chunhua He
State Key Laboratory of Urban Water Resources and Environment SKLUWRE, Harbin Institute of Technology, Harbin 150090, China
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）