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Pavez Jara, J.A. (author)
This thesis research investigated the dynamics of nutrient release and the formation of melanoidins during thermal hydrolysis processes (THP) of waste activated sludge (WAS) preceding mesophilic anaerobic digestion (AD). In Chapter 2, a fractionation of THP-sludge allowed for researching the distribution of nutrients and melanoidins over the...
doctoral thesis 2024
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Guo, H. (author)
The management and disposal of excess sludge is one of the main challenges for wastewater treatment facilities across the world. Anaerobic digestion (AD) is a widely accepted treatment method for stabilizing excess sludge due to its robustness, ability to reduce pathogens, and capacity to convert the biochemical energy enclosed in organic...
doctoral thesis 2024
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Szabo Corbacho, M. (author)
The ongoing growth of the global population has led to increased resource consumption, particularly in the realm of water resources, resulting in potential shortages and environmental concerns. The surge in industrialization has intensified the demand for freshwater, consequently causing significant contamination of global water sources through...
doctoral thesis 2024
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Garcia Rea, V.S. (author)
Anaerobic digestion (AD) is a biochemical process in which organic matter is converted into biogas in a series of biochemical reactions. The development of high-rate anaerobic reactors (HRAR) led to the breakthrough of full-scale applications of AD for the treatment of industrial wastewater. HRARs, such as the upflow anaerobic sludge blanket ...
doctoral thesis 2023
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Wasajja, H. (author)
Biomass is predominantly the major source of energy in the global south. It is the readily available source of energy in global south and is used in rural energy households in the form of wood, charcoal and agricultural residues. However, biomass energy source is not utilised in the most efficient way and hence there is still a gap in achieving...
doctoral thesis 2023
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Deng, Z. (author)
The demand for reactive nitrogen, i.e., ammonia (NH3), is constantly growing as the global population grows, especially in the nitrogen (N) fertiliser production sector. Simultaneously, the reactive nitrogen in residual streams, i.e., mainly ammonium (NH4+) and nitrate (NO3-), has caused serious environmental issues, e.g., eutrophication and...
doctoral thesis 2023
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Gonzales, A. (author)
The overall objective of the present study was to investigate the effects of thermal pre-treatment of waste activated sludge (WAS) at 70 °C with addition of H<sub>2</sub>O<sub>2</sub> to enhance sludge hydrolysis and subsequent methane production during WAS anaerobic digestion. The research was divided into four parts: Firstly, a bibliographical...
doctoral thesis 2022
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Ceron Chafla, P.S. (author)
Anaerobic processes such as Anaerobic Digestion (AD) and mixed culture fermentation (MCF) are important technologies in the bioeconomy context since they can be used to convert (waste) biomass feedstock into gaseous energy carriers and chemical commodities, theoretically without the use of any additional energy source. AD is a multi-step...
doctoral thesis 2022
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van Linden, N. (author)
Ammonia (NH3) is one of world’s most-produced chemicals and is mostly used as a raw resource for fertilisers. From the used NH3-based fertilisers, almost half of the NH3 ends up in receiving water bodies, leading to eutrophication, eventually resulting in species diversity loss in the aquatic environment. To minimise environmental damage, total...
doctoral thesis 2022
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Odriozola, Magela (author)
Anaerobic membrane bioreactor (AnMBR) technology is increasingly researched for wastewater treatment in a circular economy scenario to recover nutrients, water, and biogas. AnMBR couples the advantages of anaerobic digestion, such as low sludge production, no aeration requirement and biogas production, with the benefits of membrane technology,...
doctoral thesis 2022
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Muñoz Sierra, Julian (author)
Industrial wastewaters generated in chemical industries are often characterized by extreme conditions, such as the presence of complex, recalcitrant, and toxic aromatic compounds, high temperature, and high salinity. The mentioned conditions predominantly occur when chemical industries reduce process water use or strive for closing water loops....
doctoral thesis 2022
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Wei, P. (author)
Excess sludge handling is as important as treating the wastewater in determining the operational performance and costs in modern municipal wastewater treatment plants (WWTPs). In practice, excess sludge handling is widely implemented using anaerobic digestion (AD), in which the organic matter inside the sludge is not only stabilised and partly...
doctoral thesis 2021
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de Valk, S.L. (author)
The overall objective of this thesis was to investigate ways to improve the extent and rate of waste activated sludge (WAS) hydrolysis by researching the WAS degrading activities and mechanisms of the aquatic worm Tubifex tubifex (T. tubifex) as a starting point. The WAS degrading aquatic worms were taken as a model “biochemical reactor” of...
doctoral thesis 2021
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Riungu, J. (author)
Globally, 2.7 billion people are using onsite sanitation systems, particularly in low income, high density settlements (LIHDS) in urban areas of developing countries. However, treatment technologies to manage the faecal sludge (FS) generated from these systems are often not in place, leading to high risks for environmental and public health. The...
doctoral thesis 2021
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Kooijman, G. (author)
Organic flocculants are typically only applied in the sludge line and sometimes in quaternary treatment of conventional sewage treatment plants (STPs) that aim for enhanced nutrient removal. However, with the ongoing societal changes directing towards a higher degree of circularity of resources and a higher degree of wastewater treatment demands...
doctoral thesis 2020
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Thota Radhakrishnan, A.K. (author)
Domestic wastewater streams from households implemented with source separation, vacuum toilets, and food waste disposers are highly concentrated with respect to the total suspended solids. The concentrated domestic slurries (CDS), which generally consist of faecal matter, urine, ground kitchen waste (GKW) and water, need to be transported from...
doctoral thesis 2019
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Zahmatkesh, M. (author)
In order to address the ambiguities and knowledge gaps in the HA removal by WRF, mechanisms of removal were explored in chapter 2. It was shown that the mechanisms of HA removal by WRF involves the degradation of HA to smaller molecules, conversion to FA and also biosorption of HA by fungal mycelia. Furthermore, the ability of laccase to...
doctoral thesis 2018
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Sanchez Guilen, J.A. (author)
On a global scale, sewage represents the main point-source of water pollution and is also the predominant source of nitrogen contamination in urban regions. The present research is focused on the study of the main challenges that need to be addressed in order to achieve a successful inorganic nitrogen post-treatment of anaerobic effluents in the...
doctoral thesis 2016
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Ghasimi, D.S.M. (author)
Fine sieves can be implemented as compact alternatives to primary clarification. Fine sieved fraction (FSF) is a heterogeneous substrate that mainly consists of fibers originating from toilet paper and thus contains a high cellulosic fraction. Resource recovery and energy neutral sewage treatment is nowadays focus of many water authorities. This...
doctoral thesis 2016
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Özgün, H. (author)
In recent years, anaerobic membrane bioreactor (AnMBR) technology has been increasingly researched for municipal wastewater treatment as a means to produce nutrient-rich, solids free effluents with low levels of pathogens, while occupying a small footprint. An AnMBR can be used not only for on-site wastewater treatment, but also for the...
doctoral thesis 2015
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