Long-term impact of dissolved O2 on the activity of anaerobic granules

Shen, Chun Fang; Guiot, Serge R.

doi:10.1002/(sici)1097-0290(19960320)49:6<611::aid-bit2>3.0.co;2-r

Cited by 58 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most importantly, high-rate anaerobic treatment systems have been developed. Among these systems, the upflow anaerobic sludge bed (UASB) reactor is the most widely used in the treatment of domestic and industrial wastewater due to its low-cost and adequate treatment efficiency, which is connected with its ability to retain high biomass concentrations despite the upflow velocity of the wastewater and the production of biogas, and to accommodate low concentrations of oxygen without negatively affecting the integrity or metabolic activity of the granular biomass [31,53,82,89]. In UASB reactors, the biomass is retained as granules, formed by the natural self-immobilization of the bacteria.…”

Section: Treatment Of Lipid-rich Wastewater In Upflow Anaerobic Sludgmentioning

confidence: 99%

Behavior of lipids in biological wastewater treatment processes

Chipasa

Mędrzycka

2006

J IND MICROBIOL BIOTECHNOL

127

View full text Add to dashboard Cite

Lipids (characterized as oils, greases, fats and long-chain fatty acids) are important organic components of wastewater. Their amount, for example, in municipal wastewater is approximately 30-40% of the total chemical oxygen demand. The concern over the behavior of lipids in biological treatment systems has led to many studies, which have evaluated their removal, but still the exact behavior of lipids in these processes is not well understood. In this review, we discuss the current knowledge of how lipids/fatty acids affect both aerobic and anaerobic processes and specific methods that have been used in an attempt to enhance their removal from wastewater. Overall, the literature shows that lipids/fatty acids are readily removed by biological treatment methods, inhibitory to microbial growth as well as the cause of foaming, growth of filamentous bacteria and floc flotation.

show abstract

Section: Treatment Of Lipid-rich Wastewater In Upflow Anaerobic Sludgmentioning

confidence: 99%

Behavior of lipids in biological wastewater treatment processes

Chipasa

Mędrzycka

2006

J IND MICROBIOL BIOTECHNOL

127

View full text Add to dashboard Cite

show abstract

“…Specific substrate anaerobic activity tests (milligrams substrate per gram volatile suspended solid (VSS) per day) was performed using the method reported in Shen and Guiot (1996), through determining the depletion rate of an excess concentration of a single defined substrate (glucose for facultative and obligate anaerobic acidogenic fermenters, propionate for proton-reducing acetogens, acetate for acetotrophic a The mixed sludge is composed of aerobic and anaerobic sludge at 1:1 mass ratio methanogens) as the sole carbon source under the anaerobic condition. Aerobic microbial activity of the granules was measured as the specific oxygen uptake rate (SOUR) by following the standard methods (APHA, AWWA, WEF 1998).…”

Section: Methodsmentioning

confidence: 99%

Cultivation of Biogranules in a Continuous Flow Reactor at Low Dissolved Oxygen

Chen

Lin

Chen

et al. 2009

Water Air Soil Pollut: Focus

View full text Add to dashboard Cite

This study investigated sludge granulation inoculated with various mixtures of aerobic and anaerobic sludge at low dissolved oxygen (DO; 0.3-0.6 mg/l) or aerobic (>2.5 mg/l) conditions in four parallel flow reactor systems. Formation of high-density coupled granules was achieved in the reactor system inoculated with anaerobic and aerobic sludge seeds (1:1 mass ratio) at low DO concentrations, with a mean size of 2.5 mm after only 27 days of cultivation. The highest ratio of protein (PN) to polysaccharide (PS; 3.3) was observed for the coupled sludge compared to granules cultivated under aerobic conditions. The PN/PS ratio correlated well with high hydrophobicity, low sludge volumetric index, and compact granular structure. Activity tests of the specific anaerobic and aerobic biomass confirmed that anaerobes and aerobes coexisted in the same coupled granule. Based on the optical microscopic and SEM observations, the process of coupled granule formation was proposed.

show abstract

“…Considerable research interest is currently being focused on investigations into microaerobic conditions in natural environments (Pitcher et al, 2002), in the fields of wastewater treatment (Lasik and Nowak, 2007), biotechnological fermentation (Li et al, 2010), bioremediation of toxic compounds (Franciscon et al, 2010), and the cultivation of new bacterial species (Geelhoed et al, 2009). Shen and Guiot (1996) investigated the impact of influent dissolved oxygen (DO) on the characteristics of anaerobic granules at various DO concentrations (0.5-8.1 mg/L) in 1-and 5-L laboratory-scale modified upflow anaerobic sludge bed-anaerobic/aerobic coupled reactors. When the granular sludge was operated under oxygen-limited conditions between 1 and 3 months, there was no detrimental impact of influent DO on the methanogens, and even when the influent DO concentrations were up to 8.1 mg/L, there was no inhibitory effect on acetogens and methanogens.…”

Section: Introductionmentioning

confidence: 95%

Comparative Study of the Treatment Performance and Microbial Diversity of an Innovative Upflow Microaerobic Sludge Bed Bioreactor and an Aerobic Control System

LiHuijun

YangZhongzhi

WangYan

et al. 2015

Environmental Engineering Science

View full text Add to dashboard Cite

The treatment performance and microbial diversity of two parallel single-stage activated sludge bioreactors were investigated and compared. An innovative upflow microaerobic sludge bed (UMSB) bioreactor and an aerobic control system (ACS) were operated at dissolved oxygen levels of 0.5-0.9 and 2.5-4 mg/L, respectively. Under similar conditions, at a hydraulic retention time of 25 h, an organic loading rate of 1.4 -0.1 kg COD/m 3 $d, and an influent total phosphate (TP) of 43 -4 mg/L, the chemical oxygen demand (COD) removal efficiencies of the UMSB and the ACS were 94% -1% and 95% -1%, respectively, and no significant difference in performance was noted between the two systems ( p = 0.498). It was, however, noted that TP removal efficiency of the UMSB (57% -5%) was significantly higher compared with ACS (34% -6%) ( p = 0.00). Phylogenetic analysis indicated that bacteria in the UMSB and ACS were highly diverse and obviously different. It is likely that facultative anaerobes, microaerophiles, and aerobes were able to coexist in the UMSB. This suggests the possibility of constructing microecosystems that integrate anaerobic and aerobic niches in one reactor. In this study, we demonstrate that under oxygen-limited conditions, it is possible to construct a single-stage activated sludge bioreactor for removing organic substances and phosphorous simultaneously. These findings have important consequences for recognizing and supplementing the enhanced biological phosphorus removal process and for developing new energy-saving treatment technologies.

show abstract

Long-term impact of dissolved O2 on the activity of anaerobic granules

Cited by 58 publications

References 14 publications

Behavior of lipids in biological wastewater treatment processes

Behavior of lipids in biological wastewater treatment processes

Cultivation of Biogranules in a Continuous Flow Reactor at Low Dissolved Oxygen

Comparative Study of the Treatment Performance and Microbial Diversity of an Innovative Upflow Microaerobic Sludge Bed Bioreactor and an Aerobic Control System

Contact Info

Product

Resources

About