Inhibition of Nitrification by Heavy Metals and Organic Compounds: The ISO 9509 Test

Juliastuti, Sri Rachmania; Baeyens, Jan; Creemers, Claude

doi:10.1089/109287503763336511

Cited by 45 publications

(26 citation statements)

References 17 publications

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“…Nitrifiers are the principal group of ammonia oxidation microbes present in the aerobic basin of anoxic/oxic reactor. They are particularly susceptible to inhibition from a variety of organic compounds, inorganic substances, and metals (Hu et al 2002;Juliastuti et al 2003). Hence the aim of this study was to investigate the effect of coagulant ferrous sulphate on phosphorus and nitrogen removal.…”

Section: Introductionmentioning

confidence: 99%

Effect of ferrous sulphate on nitrification during simultaneous phosphorus removal from domestic wastewater using a laboratory scale anoxic/oxic reactor

Banu

Yeom

2008

World J Microbiol Biotechnol

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In the present study a laboratory scale anoxic/ oxic reactor was used to remove the important eutrophication nutrients such as phosphorus and nitrogen from synthetic domestic wastewater. Phosphorus was removed through simultaneous precipitation and was carried out using the coagulant ferrous sulphate FeSO 4 Á 7H 2 O. Total phosphorus in the effluent was controlled to below 1 mg/l using a ferrous to phosphorus molar ratio of 2.1. pH after the addition of coagulant plays a major role in determining the molar ratio of the precipitant. Nitrogen was removed biologically in the anoxic/oxic system and the effect of simultaneous precipitation on nitrification and denitrification was investigated. The nitrification rate of the system remained unaffected during simultaneous precipitation and varied from 0.046 to 0.059 g N-NH 4 ? /g VSS/day. Denitrification was complete and was not affected by the coagulation process. The nitrogen removal efficiency varied from 78% to 85%. COD removal efficiency was not affected during simultaneous precipitation and was varied from 94% to 98%. The highly efficient nitrogen removal in the presence of simultaneous precipitant ferrous sulphate makes the process an ideal option for nutrient removal.

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Section: Introductionmentioning

confidence: 99%

Effect of ferrous sulphate on nitrification during simultaneous phosphorus removal from domestic wastewater using a laboratory scale anoxic/oxic reactor

Banu

Yeom

2008

World J Microbiol Biotechnol

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“…The ISO 9509 norm tests toxicity by assessing the inhibition of nitrification of activated sludge microorganisms (Juliastuti et al 2003). Nitrifiers are highly sensitive to inhibitory compounds (including antibiotics) in aerobic environments.…”

Section: Nitrification (13 Studies-16 Antibiotics)mentioning

confidence: 99%

Do antibiotics have environmental side-effects? Impact of synthetic antibiotics on biogeochemical processes

Roose‐Amsaleg

Laverman²

2015

Environ Sci Pollut Res

167

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Antibiotic use in the early 1900 vastly improved human health but at the same time started an arms race of antibiotic resistance. The widespread use of antibiotics has resulted in ubiquitous trace concentrations of many antibiotics in most environments. Little is known about the impact of these antibiotics on microbial processes or "non-target" organisms. This mini-review summarizes our knowledge of the effect of synthetically produced antibiotics on microorganisms involved in biogeochemical cycling. We found only 31 articles that dealt with the effects of antibiotics on such processes in soil, sediment, or freshwater. We compare the processes, antibiotics, concentration range, source, environment, and experimental approach of these studies. Examining the effects of antibiotics on biogeochemical processes should involve environmentally relevant concentrations (instead of therapeutic), chronic exposure (versus acute), and monitoring of the administered antibiotics. Furthermore, the lack of standardized tests hinders generalizations regarding the effects of antibiotics on biogeochemical processes. We investigated the effects of antibiotics on biogeochemical N cycling, specifically nitrification, denitrification, and anammox. We found that environmentally relevant concentrations of fluoroquinolones and sulfonamides could partially inhibit denitrification. So far, the only documented effects of antibiotic inhibitions were at therapeutic doses on anammox activities. The most studied and inhibited was nitrification (25-100 %) mainly at therapeutic doses and rarely environmentally relevant. We recommend that firm conclusions regarding inhibition of antibiotics at environmentally relevant concentrations remain difficult due to the lack of studies testing low concentrations at chronic exposure. There is thus a need to test the effects of these environmental concentrations on biogeochemical processes to further establish the possible effects on ecosystem functioning.

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“…Known inhibitors include heavy metals, such as zinc, copper, and cadmium (Chandran and Love, 2008;Juliastuti et al, 2003), and a variety of organic compounds. Growth in biofilms such as those found in integrated fixed-film activated sludge (IFAS) may provide protection to nitrifiers for some inhibitors (Kim et al, 2010).…”

Section: Inhibitionmentioning

confidence: 99%

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

Melcer¹

2015

wio

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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 ...

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Inhibition of Nitrification by Heavy Metals and Organic Compounds: The ISO 9509 Test

Cited by 45 publications

References 17 publications

Effect of ferrous sulphate on nitrification during simultaneous phosphorus removal from domestic wastewater using a laboratory scale anoxic/oxic reactor

Effect of ferrous sulphate on nitrification during simultaneous phosphorus removal from domestic wastewater using a laboratory scale anoxic/oxic reactor

Do antibiotics have environmental side-effects? Impact of synthetic antibiotics on biogeochemical processes

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

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