Wastewater treatment in a biological high-performance system with high biomass concentration

Lübbecke, Sven; Vogelpohl, Alfons; Dewjanin, W.

doi:10.1016/0043-1354(94)00215-s

Cited by 83 publications

(30 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, as Lübbecke et al [5] report, increasing the biomass concentration involves a reduction in the oxygen mass transfer rate depending on the type of wastewater and reactor used. Other advantages of this system are as follows: (i) The volume of the aeration tank can be also reduced since a higher concentration of biomass can be stored in the bioreactor.…”

Section: Mbr Characteristics and Comparison With A Conventional Systemmentioning

confidence: 95%

Industrial wastewater treatment in a membrane bioreactor: A review

Marrot¹,

Barrios-Martinez²,

Moulin³

et al. 2004

Environ. Prog.

152

View full text Add to dashboard Cite

Section: Mbr Characteristics and Comparison With A Conventional Systemmentioning

confidence: 95%

Industrial wastewater treatment in a membrane bioreactor: A review

Marrot¹,

Barrios-Martinez²,

Moulin³

et al. 2004

Environ. Prog.

152

View full text Add to dashboard Cite

“…Considering the strong aeration condition (50 m 3 m −2 h −1 ) in the bioreactor, it is difficult to think that oxygen supply might be the problem. However, oxygen transfer limitations might occur inside the floes of activated sludge due to the increase of EPSs (Lübbeke et al, 1995;Muller et al, 1995). So, the increase of menaquinones from 8 to 14% with the prolongation of operational period, except for period 2, in the nitrification system was probably related with the existence of nitrate/nitrite respiration because of the limitation of oxygen transfer.…”

Section: Quinone Profilesmentioning

confidence: 99%

Nitrification performance and microbial community dynamics in a submerged membrane bioreactor with complete sludge retention

Yang

Zhang

et al. 2006

Journal of Biotechnology

View full text Add to dashboard Cite

A submerged membrane bioreactor (MBR) supplied with inorganic ammonium-bearing wastewater (NH 4 + -N, 500 mg l −1 ) was operated for 260 days without sludge purge under decreased hydraulic retention times (HRT) through six steps (from 30 to 5 h). Almost complete nitrification was obtained at a volumetric loading rate (VLR) 1.2 g NH 4 + -N l −1 day −1 . The sludge nitrification activities were evaluated at each stage. The specific ammonium oxidizing rate (SAOR) decreased from the initial 0.45 to 0.15 kg NH 4 + -N kg −1 MLSS day −1 in the last four stages, while the specific nitrate forming rate (SNFR) increased from 0.17 to 0.39 kg NO 3 − -N kg −1 MLSS day −1 at the third stage, and then decreased to below 0.1 kg NO 3from the fourth stage. Microbial population dynamics was investigated by a combination of the MPN method, fluorescence in situ hybridization (FISH) and quinone profiles. During the experiment, although the MLSS increased gradually from 4.5 to 11.5 g l −1 , the number of ammonia-oxidizing bacteria (AOB) decreased from 10 9 l −1 at the third stage to 10 7 l −1 in the last two stages, and that of nitrite-oxidizing bacteria (NOB) decreased gradually from 10 8 l −1 at the second stage (HRT of 20 h) to the final 10 5 l −1 . FISH results showed that the active cells decreased gradually with time from about 60 to 20% in the last two stages, and most of sludge was inert cells. The sum of nitrifiers occupied only about 10% of the total bacteria number in the last stage even though only ammonium-bearing inorganic wastewater was fed in. Nitrosomonas sp. and Nitrospira sp. were confirmed by FISH as the dominant nitrifying genera responsible for ammonia and nitrite oxidation, respectively. In the mean time, a small ratio of Nitrobacter sp. also existed in the system. FISH analysis matched better with the batch activity test results than did the MPN techniques. Quinone profiles revealed that the dominant ubiquinone was ubiquinone-8 (UQ-8), ranging from 84 to 66%, followed by UQ-10 of 7-13%, UQ-7 of 3-5% and UQ-9 of 1.6-2.6%. The dominant menaquinone in the MBR was menaquinone-7 (MK-7) followed by MK-6, MK-8 and MK-8 (H 2 ). With the prolongation of operation, the percentage of menaquinones increased from 8 to 14%. The use of the polyphasic approach gave some new insight on variations of microbial community structures.

show abstract

“…TSS mean values in the effluent were lower than 30 mg L À1 (Table 1). The PCMAS enhanced processes performance is achieved not only by complete SRT, high HRT and high DO concentration but mainly due to the high biomass concentration (Lubbeke et al, 1995).…”

Section: Resultsmentioning

confidence: 99%