Novel developments in biological technologies for wastewater processing

Milledge, John J.; Thompson, Edward P.; Sauvêtre, Andrés; Schröeder, Peter; Harvey, Patricia J.

doi:10.1016/b978-0-12-816170-8.00008-9

Cited by 5 publications

(4 citation statements)

References 133 publications

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“…Furthermore, this information provides the scientific community with applications for the improvement of remediation techniques based on phytomanagement. Constructed wetlands and algal pond treatment systems sit at the forefront of innovations in contemporary wastewater treatment aimed at the food-water-energy nexus, and biotechnological advances in this field will still be necessary in the coming years [124]. Moreover, studies using plants as monitoring devices for assessing the fate and environmental presence of pharmaceuticals will be helpful to protect our agroecosystems [125].…”

Section: Discussionmentioning

confidence: 99%

Metabolism of Pharmaceuticals in Plants and Their Associated Microbiota

Sauvêtre

Eichhorn

Pérez

2020

The Handbook of Environmental Chemistry

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With the increasing use of wastewater for irrigation of farmland, and thus the potential uptake and translocation of pharmaceuticals and their metabolites in crops, concerns about food safety are growing. After their uptake, plants are able to metabolize drugs to phase I, phase II, and phase III metabolites. Phase I reactions closely resemble those encountered in human drug metabolism, including oxidations, reductions, and hydrolysis. Phase II reactions, in turn, encompass conjugations with glutathione, carbohydrates, malonic acid, and amino acids. In phase III, these conjugates are transported and stored in the vacuole or bound to the cell wall. Pharmaceutical metabolism in plants has been investigated by using different approaches, namely, the use of whole plants grown in soil or hydroponic cultures, the use of plant tissues, and the incubation of specific plant cell suspensions. While studies relying on whole plants require long growth periods and more complex analytical procedures to isolate and detect metabolites, they constitute more realistic scenarios with the ability to determine site-specific metabolism and the translocation within the plant. The advantage of in vitro studies lies in their rapid setup. Recent advances in plant-microbiota investigations have shown that the plant microbiome modulates the response of the plant towards pharmaceuticals. Rhizospheric and endophytic bacteria can directly contribute to pharmaceutical metabolism and influence plant uptake and translocation of pharmaceuticals and their metabolites. Additionally, they can have beneficial properties for the host, contributing to plant health and fitness. This chapter gives an overview of human and plant drug metabolism followed by a comparison of different models used to identify pharmaceutical metabolites and their metabolic pathways in plants. A description of the mechanisms and reactions originating these metabolites is concisely presented. Finally, the role of the microbiome is critically discussed with examples of synergies between plants and their associated microbiota for pharmaceutical degradation.

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Section: Discussionmentioning

confidence: 99%

Metabolism of Pharmaceuticals in Plants and Their Associated Microbiota

Sauvêtre

Eichhorn

Pérez

2020

The Handbook of Environmental Chemistry

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“…If macroalgae are to be harvested or cultivated for biofuel production, an economic approach to the production could involve bioremediation. Biosorption via seaweed has become an alternative to the existing technologies in effectively removing these pollutants from wastewater as the majority of macroalgae grow submerged in water and can take up dissolved nutrients across their entire surface area which make them ideal for extraction of nutrients from nutrient-rich wastewaters [163]. For example, the green seaweed Ulva is presently successfully used in several bioremediation processes [6,164,165] and has been shown to grow on seawater and effluent from a sewage treatment plant [166] or on reject/drainage wastewater from dewatered sludge [6].…”

Section: Bioremediation As Part Of Refining Macroalgae For Biofuel Production and Its Challengesmentioning

confidence: 99%

The Effects of Halogenated Compounds on the Anaerobic Digestion of Macroalgae

et al. 2020

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The urgent need to replace fossil fuels has seen macroalgae advancing as a potential feedstock for anaerobic digestion. The natural methane productivity (dry weight per hectare) of seaweeds is greater than in many terrestrial plant systems. As part of their defence systems, seaweeds, unlike terrestrial plants, produce a range of halogenated secondary metabolites, especially chlorinated and brominated compounds. Some orders of brown seaweeds also accumulate iodine, up to 1.2% of their dry weight. Fluorine remains rather unusual within the chemical structure. Halogenated hydrocarbons have moderate to high toxicities. In addition, halogenated organic compounds constitute a large group of environmental chemicals due to their extensive use in industry and agriculture. In recent years, concerns over the environmental fate and release of these halogenated organic compounds have resulted in research into their biodegradation and the evidence emerging shows that many of these compounds are more easily degraded under strictly anaerobic conditions compared to aerobic biodegradation. Biosorption via seaweed has become an alternative to the existing technologies in removing these pollutants. Halogenated compounds are known inhibitors of methane production from ruminants and humanmade anaerobic digesters. The focus of this paper is reviewing the available information on the effects of halogenated organic compounds on anaerobic digestion.

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“…Wastewater treatment and recycling continue to be important methods to relieve the pressure of water scarcity. Researchers have been dedicated to developing and adapting innovative energy-saving and economic wastewater treatment technologies to support ecological system health and sustained social stability [1,[3][4][5][6]. Among these novel water and wastewater treatment technologies, the membrane biofilm reactor (MBfR) has attracted attention due to the special counter-diffusion of the electron donor and acceptor [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The C/N Ratio’s Effect on a Membrane-Aerated Biofilm Reactor (MABR): COD and Nitrogen Removal, Biofilm Characteristics, and Microbial Community Structure

Zhong,

Dong,

Tang

et al. 2023

Water

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In this study, a laboratory-scale membrane aerated biofilm reactor system was operated successively through four phases with different C/N ratios (7, 5, 3, and 1) for 15 days each to investigate the C/N ratio’s effect on the COD and nitrogen removal. The COD and NH4+-N removal efficiencies were slightly affected; however, NO3−-N accumulated in the C/N = 1 phase, and slight NO2−-N accumulation was observed in the C/N = 7 phase, leading to lower total nitrogen (TN) removal in the two phases. The TN removal efficiency reached the highest in the C/N = 5 phase at around 70%, and the TN concentration was reduced to 12.3 mg/L on average. Biomass and biofilm thickness had a positive correlation with C/N ratios. The C/N ratio affected not only the generation of extracellular polymeric substances but also their chemical composition. Microbial analysis revealed that a C/N ratio of 5 was the most suitable for both nitrifying and denitrifying bacteria, and a higher C/N ratio favored aerobic denitrifying microbes.

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Novel developments in biological technologies for wastewater processing

Cited by 5 publications

References 133 publications

Metabolism of Pharmaceuticals in Plants and Their Associated Microbiota

Metabolism of Pharmaceuticals in Plants and Their Associated Microbiota

The Effects of Halogenated Compounds on the Anaerobic Digestion of Macroalgae

The C/N Ratio’s Effect on a Membrane-Aerated Biofilm Reactor (MABR): COD and Nitrogen Removal, Biofilm Characteristics, and Microbial Community Structure

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