Effect of temperature and ph on the effective maximum specific growth rate of nitrifying bacteria

Antoniou, P.; Hamilton, J. A.; Koopman, Ben; Jain, Ritu; Holloway, Brian; Lyberatos, G.; Svoronos, Spyros A.

doi:10.1016/0043-1354(90)90070-m

Cited by 260 publications

(111 citation statements)

References 4 publications

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“…Villaverde [44] observed that nitrification efficiency increased linearly by 13% per pH unit within a pH range between 5.0 and 9.0 with the highest activity of ammonium oxidizers at 8.2. Similar observations were made by Antoniou et al [45], who report the overall nitrification pH of approximately 7.8. There are three major bacteria, for which optimal pH conditions are as follows: (1) Nitrobacter: 7.5 [46]; (2) Nitrosomonas: 7.0-7.5 [47], and (3) Nitrospira: 8.0-8.3 [48].…”

Section: Ph Stabilizationsupporting

confidence: 75%

Challenges of Sustainable and Commercial Aquaponics

et al. 2015

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Abstract:The world is facing a number of serious problems of which population rise, climate change, soil degradation, water scarcity and food security are among the most important. Aquaponics, as a closed loop system consisting of hydroponics and aquaculture elements, could contribute to addressing these problems. However, there is a lack of quantitative research to support the development of economically feasible aquaponics systems. Although many studies have addressed some scientific aspects, there has been limited focus on commercial implementation. In this review paper, opportunities that have the potential to fill the gap between research and implementation of commercial aquaponic systems have been identified. The analysis shows that aquaponics is capable of being an important driver for the development of integrated food production systems. Arid regions suffering from water stress will particularly benefit from this technology being operated in a commercial environment. OPEN ACCESSSustainability 2015, 7 4200

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Section: Ph Stabilizationsupporting

confidence: 75%

Challenges of Sustainable and Commercial Aquaponics

et al. 2015

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“…Villaverde (1997) observed that nitrification efficiency increased linearly by 13% per pH unit within a pH range between 5.0 and 9.0 with the highest activity of ammonium oxidizers at 8.2. Similar observations were made by Antoniou et al (1990), who report the overall nitrification pH of approximately 7.8. There are three major bacteria, for which optimal pH conditions are as follows: (1) Nitrobacter: 7.5 (Keen and Prosser, 1987); (2) Nitrosomonas: 7.0-7.5 (Hatayama et al, 2000), and (3) Nitrospira: 8.0-8.3 (Blackburne et al, 2007).…”

Section: Ph Stabilizationsupporting

confidence: 73%

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Goddek

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v Preface Which of us is not familiar with this situation during the student time: on a Wednesday night, one wants to go out to grab a beer ("just one Duveltje") with friends. Until the end of the night (and several beers later) one was trapped in several discussions about religion, politics, and one's field of study. I have to admit, that I have been involved in plenty of such discussions, which also stems from the fact that I am a very discussion-friendly and curious person. However, I caught myself often saying the same sentence "well, the idea is great, but it actually does not really work as it should" with respect to two topics: Aquaponics and Communism. This might appear to be a somewhat far-fetched statement, however, for those who have neither read Marx nor followed the development of aquaponics the last 30 years: in a nutshell it can be stated that both of these ideas follow bottom-up (i.e. local and circular) approaches (i.e. for small farmers and individuals).Additionally to the above, I honestly believe that in times of the financial crisis -in which multinational corporations such as [think of big corporations that produce GMO seeds that are immune to their pesticides] increase their quasi-monopoly positions on the global food market -a paradigm shift back to human-centred and sustainable agricultural development is required to ensure both (1) healthy (i.e. pesticide free) diets and (2) food independence. In contrast, organic, fair trade, and GMO-free food have recently gained rapidly increasing popularity. Consumers want transparent and extensive information about the origin and manufacture of the foodstuffs they buy. The development of agriculture and how to use (finite) resources efficiently will be crucial with respect to the global development and the future of the earth in general. Right now, we are at a crossroads in our history that will determine whether either the people or the corporations will be empowered. I intended to provocatively illustrate this new class conflict on the book cover with the objective to polarize and thus energize the readers themselves to make thoughts and reflections.So far, I have dedicated over 4 years of my life to study and improve aquaponic systems in the hope that one day their production efficiency will be able to compete with state-of-theart hydroponic food production systems, while improving circularity. In this thesis, I will try to demonstrate why aquaponics does not face the same pitfalls as communism, while sharing the empowering people-minded and bottom-up qualities that are required in the 21st century.

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“…Corroborating this behavior are low nitrogen removal efficiencies at a salt concentration of 1 and 2%, nitrate accumulation and NO 2 --N formation under low DO concentrations. Nitrite accumulation has shown to cause a toxic effect linked to pH effects on biomass, specifically ammonia oxidizers (Antoniou et al, 1990;Moussa et al, 2003). This decreased nitrogen removal profiles have caused a significant impact on the networks generalization pattern while mapping these variables.…”

Section: Network Architecturementioning

confidence: 99%

Experimental Results and Neural Prediction of Sequencing Batch Reactor Performance under Different Operational Conditions

Rene

Joo²,

Park

2008

J ENV INFORM

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ABSTRACT. Three lab scale sequencing batch reactors (SBR) were simultaneously operated at different process conditions to understand the dynamics of organic and nitrogen removal from a synthetic wastewater source. The SBRs were operated continuously for 255 days at different C/N ratio (3 -6), aeration time (4 -10 hr) and salt concentrations (0.5 -2%). The COD removal efficiencies under steady state operation were consistently greater than 80%, while nitrogen removal efficiencies (10 -98%) were inhibited by high salt concentrations. Back propagation neural network was applied to model this experimental data using influent COD, influent nitrogen, salt concentration, aeration time, MLSS concentration and C/N ratio as the input parameters to predict the performance parameters, viz., COD removal efficiency (COD-RE), total nitrogen removal efficiency (T-RE), NH 4 + -N, NO 3 --N and NO 2 --N formed. The data points were randomized and divided into training (190 × 3) and testing set (65 × 3). The internal network parameters were selected using the 2 k full factorial design of experiments. The appropriate network topology for this system (6-12-5) was selected by estimating the best correlation coefficient (R) value (0.8482) achieved during prediction of the testing set. The result from this study showed that a neural network based model can be used as an efficient data driven model to predict the performance of a SBR unit.

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Effect of temperature and ph on the effective maximum specific growth rate of nitrifying bacteria

Cited by 260 publications

References 4 publications

Challenges of Sustainable and Commercial Aquaponics

Challenges of Sustainable and Commercial Aquaponics

Opportunities and Challenges of Multi-Loop Aquaponic Systems

Experimental Results and Neural Prediction of Sequencing Batch Reactor Performance under Different Operational Conditions

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