Effect of operating variables on nitrification rates in trickling filters

Parker, Denny; Lutz, Mike; Andersson, Bengt; Aspegren, Henrik

doi:10.2175/106143095x133374

Cited by 44 publications

(48 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, the basis of measurement in this work is based on surface reaction rates rather than reactions based on the mass of organisms, as in the activated sludge models. Similar findings with respect to lower declines with temperature have also been found with nitrifying trickling filters when compared to activated sludge plants (Parker et al, 1995).…”

Section: Temperaturesupporting

confidence: 77%

“…speculate that reduced aeration during cold temperatures would result in reduced mixing, turbulence, and sloughing, therefore allowing for thicker, more dense biofilms. Parker et al (1995) noted a similar relationship in nitrifying trickling filters, and speculated that the thic biomass could be one reason why nitrifying tric ling filters don't have the cold temperature declines observed in activated sludge systems.…”

Section: Continuous-flow Reactorsmentioning

confidence: 87%

See 1 more Smart Citation

Mass Transfer Characteristics of Floating Media in MBBR and IFAS Fixed-Film Systems

Melcer¹

2015

wio

View full text Add to dashboard Cite

2014 U4R11ii The Water Environment Research Foundation, a not-for-profit organization, funds and manages water quality research for its subscribers through a diverse public-private partnership between municipal utilities, corporations, academia, industry, and the federal government. WERF subscribers include municipal and regional water and water resource recovery facilities, industrial corporations, environmental engineering firms, and others that share a commitment to cost-effective water quality solutions. WERF is dedicated to advancing science and technology addressing water quality issues as they impact water resources, the atmosphere, the lands, and quality of life. This report was prepared by the organization(s) named below as an account of work sponsored by the Water Environment Research Foundation (WERF). Neither WERF, members of WERF, the organization(s) named below, nor any person acting on their behalf: (a) makes any warranty, express or implied, with respect to the use of any information, apparatus, method, or process disclosed in this report or that such use may not infringe on privately owned rights; or (b) assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method, or process disclosed in this report. Brown and Caldwell, University of New MexicoThis document was reviewed by a panel of independent experts selected by WERF. Mention of trade names or commercial products or services does not constitute endorsement or recommendations for use. Similarly, omission of products or trade names indicates nothing concerning WERF's positions regarding product effectiveness or applicability. Mass Transfer Characteristics of Floating Media in MBBR and IFAS Fixed-Film Systems iii About WERFThe Water Environment Research Foundation, formed in 1989, is America's leading independent scientific research organization dedicated to wastewater and stormwater issues. Throughout the last 25 years, we have developed a portfolio of more than $130 million in water quality research.WERF is a nonprofit organization that operates with funding from subscribers and the federal government. Our subscribers include wastewater treatment facilities, stormwater utilities, and regulatory agencies. Equipment companies, engineers, and environmental consultants also lend their support and expertise as subscribers. WERF takes a progressive approach to research, stressing collaboration among teams of subscribers, environmental professionals, scientists, and staff. All research is peer reviewed by leading experts.For the most current updates on WERF research, sign up to receive Laterals, our bi-weekly electronic newsletter.Learn more about the benefits of becoming a WERF subscriber by visiting www.werf.org. ivThe authors would like to acknowledge the media donors for their financial support and advice during the conduct of this experiment. They would also like to thank the staff at the Albuquerque, New Mexico, Wastewater Reclamation Facility for providing inoculation source ...

show abstract

Section: Temperaturesupporting

confidence: 77%

Section: Continuous-flow Reactorsmentioning

confidence: 87%

Mass Transfer Characteristics of Floating Media in MBBR and IFAS Fixed-Film Systems

Melcer¹

2015

wio

View full text Add to dashboard Cite

show abstract

“…Although Bouillot et al (1992) used attached growth nitrifiers; their systems were fed less than 1 mg NH þ 4 ZN=L. This low concentration of ammonia, common for drinking water systems, may have limited the rate of nitrification within their attached growth treatment systems (Gullicks & Cleasby 1986;Parker et al 1989Parker et al , 1995.…”

Section: Temperature Correction Coefficients: Acclimatized Experimentsmentioning

confidence: 99%

Kinetic analysis of attached growth nitrification in cold climates

Delatolla

Tufenkji

Comeau

et al. 2009

Water Science and Technology

View full text Add to dashboard Cite

The rate of nitrification within a laboratory-scale Biological Aerated Filtration treatment system at 48C was investigated during an exposure time of approximately four months (acclimatized experiments). In addition, shock experiments from 208C to 48C and from 48C to 208C were performed. The acclimatized experiments demonstrated that the exposure time the system remained at low temperature strongly affects the rates of nitrification. Nevertheless, the experiments showed that significant nitrification rates are maintained for up to 115 days at 48C.The rate of ammonia removal after an exposure time of 115 days at 48C was shown to be as high as 16% of the rate of removal observed at 208C. The 208C to 48C shock experiment demonstrated a 56% decrease in the rate of ammonia removal. On the other hand, the 48C to 208C shock experiment demonstrated an increase in the relative rates of ammonia removal of up to 300% when compared to rates of removal measured after 115 days at 48C. Thus, although the rates of nitrification have been shown to decrease significantly as a function of exposure time at 48C, the process has demonstrated important rates of ammonia removal at 48C for the approximate span of the North American winter.

show abstract

“…Full-scale tertiary nitrifying trickling filters (TNTFs), which are employed for nitrification only and negligible organic material removal, are fairly common in the USA (Lutz et al, 1990). Although certain problems with macrofauna (snails, worms, larvae, and flies, which reduce nitrification rates) have been encountered, high ammonia-removal rates have been achieved economically in TNTFs at around 1 g free and saline amonia N/(m 2 media surface per day) (Parker et al, 1989(Parker et al, , 1995(Parker et al, , 1996. Therefore, on the basis of the experience in the USA, implementing external nitrification in trickling filters is not expected to be a major problem, but will require attention in future full-scale implementations of the system.…”

Section: Opportunities For Implementation Of Enbnras Systems and Systmentioning

confidence: 99%

Experimental investigation of the external nitrification biological nutrient removal activated sludge (ENBNRAS) system

Sötemann

Moodley

et al. 2003

Biotech & Bioengineering

View full text Add to dashboard Cite

A systematic lab-scale experimental investigation is reported for the external nitrification (EN) biological nutrient removal (BNR) activated sludge (ENBNRAS) system, which is a combined fixed and suspended medium system. The ENBNRAS system was proposed to intensify the treatment capacity of BNR-activated sludge (BNRAS) systems by addressing two difficulties often encountered in practice: (a) the long sludge age for nitrification requirement; and (b) sludge bulking. In the ENBNRAS system, nitrification is transferred from the aerobic reactor in the suspended medium activated sludge system to a fixed medium nitrification system. Thus, the sludge age of the suspended medium activated sludge system can be reduced from 20 to 25 days to 8 to 10 days, resulting in a decrease in reactor volume per ML wastewater treated of about 30%. Furthermore, the aerobic mass fraction can also be reduced from 50% to 60% to <30% and concommitantly the anoxic mass fraction can be increased from 25% to 35% to >55% (if the anaerobic mass fraction is 15%), and thus complete denitrification in the anoxic reactors becomes possible. Research indicates that both the short sludge age and complete denitrification could ameliorate anoxic aerobic (AA) or low food/microorganism (F/M) ratio filamentous bulking, and hence reduce the surface area of secondary settling tanks or increase the treatment capacity of existing systems. The lab-scale experimental investigations indicate that the ENBNRAS system can obtain: (i) very good chemical oxygen demand (COD) removal, even with an aerobic mass fraction as low as 20%; (ii) high nitrogen removal, even for a wastewater with a high total kjeldahl nitrogen (TKN)/COD ratio, up to 0.14; (iii) adequate settling sludge (diluted sludge volume index [DSVI] <100 mL/g); and (iv) a significant reduction in oxygen demand.

show abstract

Effect of operating variables on nitrification rates in trickling filters

Cited by 44 publications

References 5 publications

Mass Transfer Characteristics of Floating Media in MBBR and IFAS Fixed-Film Systems

Mass Transfer Characteristics of Floating Media in MBBR and IFAS Fixed-Film Systems

Kinetic analysis of attached growth nitrification in cold climates

Experimental investigation of the external nitrification biological nutrient removal activated sludge (ENBNRAS) system

Contact Info

Product

Resources

About