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1.
Huan Jing Ke Xue ; 32(10): 2979-85, 2011 Oct.
Article in Chinese | MEDLINE | ID: mdl-22279912

ABSTRACT

The ability of simultaneous phosphorus and nitrogen removal of sequencing batch membrane bioreactor run in anaerobic/oxic/ anoxic mode (AOA MBR) was examined under three aeration intensities [2.5, 3.75 and 5.0 m3 x (m2 x h)(-10]. The results showed that the averaged removals of COD were over 90% at different aeration intensities. And the higher aeration intensity was, the more ammonia nitrogen removal rate achieved. The removal rates of NH4(+) under the three aeration intensities were 84.7%, 90.6% and 93.8%, respectively. Total nitrogen removal rate increased with the increasing aeration intensity. But excessive aeration intensity reduced TN removal. The removal rates of TN under the three aeration intensities were 83.4%, 87.4% and 80.6%, respectively. Aeration intensity affected the denitrifying phosphorus ability of the AOA MBR. The ratio of denitrification phosphorus removal under the three aeration intensities were 20%, 30.2% and 26.7%, respectively.


Subject(s)
Bioreactors , Nitrogen/isolation & purification , Oxygen/chemistry , Phosphorus/isolation & purification , Waste Disposal, Fluid/methods , Denitrification , Membranes, Artificial , Nitrogen/metabolism , Oxidation-Reduction , Phosphorus/metabolism , Wastewater/chemistry
2.
Huan Jing Ke Xue ; 30(7): 1995-2000, 2009 Jul 15.
Article in Chinese | MEDLINE | ID: mdl-19774998

ABSTRACT

The self-designed MUCT-MBR simplifies the MUCT process with reducing reactors from 5 to 2, which greatly reduces land occupied by equipment. Instead of secondary sedimentation tank, the membrane effluent quality is quite safe, and the operation is simple. In the investigation about simultaneous phosphorus and nitrogen removal of MUCT-MBR, the results showed that: when the proportions of C, N and P in the influent were 33.3/5/1-25/5.5/1, the average removal rate of COD, TN and TP in the whole experimental process were 89.3%, 75.4% and 79.2%, respectively. And the sludge settling capacity had no influence on the membrane effluent quality. The key factor of N and P removal rates is denitrifying phosphorus removal in anoxic condition. The proportion of denitrifying phosphate accumulating organisms (DPAOs) and the rate of denitrifying phosphorous removal were 84.2% and 67.07% on the 58th day, respectively.


Subject(s)
Bioreactors/microbiology , Membranes, Artificial , Nitrogen/isolation & purification , Phosphorus/isolation & purification , Waste Disposal, Fluid/methods , Aerobiosis , Anaerobiosis
3.
Huan Jing Ke Xue ; 28(3): 517-21, 2007 Mar.
Article in Chinese | MEDLINE | ID: mdl-17633626

ABSTRACT

The enrichment and characteristics of denitrifying phosphate accumulating organisms (DPAO), which are capable of utilizing nitrate as electron acceptor, was investigated in a laboratory-scale sequencing batch membrane bioreactors (SBMBR). The results demonstrated that the proportion of DPAO increased from 19.4% to 69.6% of total phosphate accumulating organisms after anaerobic-aerobic and anaerobic-anoxic-aerobic phases. SBMBR system could operate steadily when 120 mg nitrate was added continuously during the anoxic phase every period. Simultaneous phosphate uptake and biological denitrification with good performance could be obtained in SBMBR operated in steady-state. Nitrate and phosphorus removal efficiency were above 100% and 84% respectively during anoxic phase, however, the effluent TP concentration was low than 0.5 mg/L, the total phosphorus removal efficiency was 96.1%. Furthermore, the ammonium nitrogen removal efficiency of SBMBR could be maintained at 92.2%, and the cumulation of nitrite and nitrate was not observed clearly.


Subject(s)
Bacteria/metabolism , Bioreactors/microbiology , Phosphorus/metabolism , Waste Disposal, Fluid/methods , Water Pollutants/metabolism , Anaerobiosis , Bacteria/growth & development , Biodegradation, Environmental , Nitrates/metabolism , Nitrogen/metabolism , Phosphorus/isolation & purification , Water Pollutants/isolation & purification , Water Purification/methods
4.
Huan Jing Ke Xue ; 27(11): 2233-8, 2006 Nov.
Article in Chinese | MEDLINE | ID: mdl-17326432

ABSTRACT

Two SBMBRs run in AO and A2O mode were operated in parallel to compare their ability of simultaneous phosphorus and nitrogen removal. The results showed that the removals of COD and ammonium nitrogen were averaged over 90% and 95%, respectively. A2O MBR has the stronger anaerobic phosphorus release ability; its SPRR30 outdoes 47.5% compared to AO MBR. SPUR30 of A2O MBR was lower which may attribute to the higher effluent TP content. The ratio of DPAO was enhanced 57% compared to AO MBR. And when nitrate as the only electron accepter, the phosphorus uptake mass with unit electron transfer was 30% higher in A2O MBR. This two factors lead to the stronger denitrifying phosphorus removal ability of A2O MBR. Furthermore, the membrane fouling was mitigated in A2O MBR though the aerobic time was half to that of AO MBR. The membrane filter function made SBMBR's effluent free of the sludge settlement ability.


Subject(s)
Bioreactors , Membranes, Artificial , Nitrogen/metabolism , Phosphorus/metabolism , Waste Disposal, Fluid/methods , Ammonia/isolation & purification , Ammonia/metabolism , Nitrogen/isolation & purification , Organic Chemicals/metabolism , Phosphorus/isolation & purification , Reproducibility of Results , Sewage/chemistry , Sewage/microbiology , Waste Disposal, Fluid/instrumentation
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