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van der Hoek, J.P. (author), Deng, Tianyi (author), Spit, Tiza (author), Luimstra, Veerle (author), de Kreuk, M.K. (author), van Halem, D. (author)Organic micropollutants (OMPs) enter the aquatic environment via municipal wastewater treatment plants (WWTPs). As conventional WWTPs have limited capacity for the removal of OMPs, additional processes are required, like ozone - granular activated carbon (GAC) filtration. A specific lay-out of this process is the O3-STEP® process, in which the...journal article 2024
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Piaggio, A.L. (author), Smith, Geo (author), de Kreuk, M.K. (author), Lindeboom, R.E.F. (author)Particle-bubble collisions in dissolved air flotation (DAF) systems play a crucial role in the removal of total suspended solids (TSS). DAF particle-bubble collision models incorporate factors such as particle diameters, charge and density, bubble diameters, and collision factors. The challenge lies in accounting for the wide range of...journal article 2024
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Pavez Jara, J.A. (author), Iswarani, W.P. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)Thermal hydrolysis process (THP) is a widely used pre-treatment method in the anaerobic digestion (AD) of waste municipal sewage sludge. A post AD dewatering step of the digestate produces a liquid stream called reject water. THP increases the concentration of humic substances (HSs) and nutrients in the produced reject water. Struvite...journal article 2024
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Guo, H. (author), McIntyre, Maaike (author), Visser, André (author), Kuipers, Hans (author), van Lier, J.B. (author), de Kreuk, M.K. (author)A full-scale high-rate cascade anaerobic digestion (CAD) system was evaluated for its ability to enhance enzymatic sludge hydrolysis. The system included a newly built digester, innovatively divided into three pie-shaped compartments (500 m<sup>3</sup> each), followed by an existing, larger digester (1500 m<sup>3</sup>). The system treated a...journal article 2024
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Zhang, Lujing (author), Hu, Yuchen (author), Li, Peng (author), Wei, Renke (author), Pang, Hongtao (author), de Kreuk, M.K. (author), Qu, Shen (author), Lam, K.L. (author), van der Meer, Walter (author), Liu, G. (author)This study assessed the evolution of wastewater systems during the rapid urbanization of Beijing, with special focuses on the carbon footprints and growing underground WWTPs (u-WWTPs). Specifically, the Bishui plant (in situ constructed u-WWTP) was assessed in detail regarding eco-environmental benefits. Our results showed that, the direct...journal article 2024
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Piaggio, A.L. (author), Mittapalli, Srilekha (author), Calderon Franco, D. (author), Weissbrodt, D.G. (author), van Lier, J.B. (author), de Kreuk, M.K. (author), Lindeboom, R.E.F. (author)This study investigates the effects, conversions, and resistance induction, following the addition of 150 μg·L<sup>−1 </sup>of two antibiotics, sulfamethoxazole (SMX) and trimethoprim (TMP), in a laboratory-scale micro-aerated anaerobic membrane bioreactor (MA-AnMBR). TMP and SMX were removed at 97 and 86%, indicating that micro-aeration did not...journal article 2023
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Piaggio, A.L. (author), Sasidhar, K.B. (author), Khande, Pravin (author), Balakrishnan, Malini (author), van Lier, J.B. (author), de Kreuk, M.K. (author), Lindeboom, R.E.F. (author)This study reports the effects of microaeration on a laboratory-scale AnMBR (MA-AnMBR) fed with synthetic concentrated domestic sewage. The imposed oxygen load mimics the oxygen load coming from a dissolved air flotation (DAF) unit, establishing an anaerobic digester-DAF (AD-DAF) combination with sludge recycling. Results showed a reduced COD...journal article 2023
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Pavez Jara, J.A. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)Thermal hydrolysis process (THP) is a well-established anaerobic digestion (AD) pre-treatment technology. Despite the THP benefits the pre-treatment increases the concentrations of nutrients and melanoidins in the digestate reject water after dewatering. The increased concentrations of nutrients and melanoidins formed during THP-AD can impact...journal article 2023
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Pavez Jara, J.A. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)Full-scale thermal hydrolysis processes (THP) showed an increase in nutrients release and formation of melanoidins, which are considered to negatively impact methanogenesis during mesophilic anaerobic digestion (AD). In this research, fractionation of THP-sludge was performed to elucidate the distribution of nutrients and the formed...journal article 2023
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Wei, P. (author), Uijttewaal, W.S.J. (author), Spanjers, H. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)Gas-mixing is commonly applied in anaerobic digesters, yet the resulting flow and hydraulic mixing are difficult to evaluate because of limited full-scale experimental data and uncertainties in integrating sludge rheological data. This study used computational fluid dynamics (CFD) to assess the impact of treated sludge rheology on flow and...journal article 2023
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van den Berg, L. (author), Toja Ortega, S. (author), van Loosdrecht, Mark C.M. (author), de Kreuk, M.K. (author)Aerobic granular sludge (AGS) is an advanced biofilm-based technology for wastewater treatment. Diffusion of substrates into the granules is a key aspect of this technology. Domestic wastewater contains soluble organic substrates of different sizes that could potentially diffuse into the granules. In this study, the relation between the...journal article 2022
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van den Berg, L. (author), Pronk, M. (author), van Loosdrecht, Mark C.M. (author), de Kreuk, M.K. (author)Granular sludge processes are frequently used in domestic and industrial wastewater treatment. The granule buoyant density and biomass density are important parameters for the design and operation of granular sludge reactors. Different methods to measure the granule density include the pycnometer method, the Percoll density gradient method,...journal article 2022
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Gonzales, A. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)The pre-treatment of waste activated sludge (WAS) has become more common since it often results in improved bioconversion to methane, in both rate and extent. However, thorough insights on the possible effects and mechanisms of mild pre-treatment techniques, such as temperatures <100 °C combined with the addition of H<sub>2</sub>O<sub>2<...journal article 2022
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Toja Ortega, S. (author), van den Berg, L. (author), Pronk, M. (author), de Kreuk, M.K. (author)In aerobic granular sludge (AGS) reactors, granules of different sizes coexist in a single reactor. Their differences in settling behaviour cause stratification in the settled granule bed. In combination with substrate concentration gradients over the reactor height during the anaerobic plug-flow feeding regime, this can result in functional...journal article 2022
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Spit, T.P.M. (author), van der Hoek, J.P. (author), de Jong, Coen (author), van Halem, D. (author), de Kreuk, M.K. (author), Bicudo, Bruno (author)At wastewater treatment plants (WWTPs), additional steps are introduced for removal of organic micropollutants (OMPs) from the treated effluents, especially pharmaceutical residues. At the same time, a new concern is emerging: antibiotic resistance (AR). This research studied the effect of ozonation, coagulation and granular activated carbon ...journal article 2022
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Piaggio, A.L. (author), Soares, Lais A. (author), Balakrishnan, Malini (author), Guleria, Tavishi (author), de Kreuk, M.K. (author), Lindeboom, R.E.F. (author)The Barapullah drain crosses through New Delhi, India, and transports millions of cubic meters of stormwater, municipal sewage and industrial sewage to the Yamuna River. Seasonal variations and ambiguous annual discharges cause 20-fold fluctuations in hydraulic flows, pollutants type and concentration. Furthermore, New Delhi is among the most...journal article 2022
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Toja Ortega, S. (author), Pronk, M. (author), de Kreuk, M.K. (author)Complex substrates, like proteins, carbohydrates, and lipids, are major components of domestic wastewater, and yet their degradation in biofilm-based wastewater treatment technologies, such as aerobic granular sludge (AGS), is not well understood. Hydrolysis is considered the rate-limiting step in the bioconversion of complex substrates, and as...journal article 2021
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Duque, Anouk F. (author), Bessa, Vânia S. (author), van Dongen, L.G.J.M. (author), de Kreuk, M.K. (author), Mesquita, Raquel B.R. (author), Rangel, António O.S.S. (author), van Loosdrecht, Mark C.M. (author), Castro, Paula M.L. (author)The presence of toxic compounds in wastewater can cause problems for organic matter and nutrient removal. In this study, the long-term effect of a model xenobiotic, 2-fluorophenol (2-FP), on ammonia-oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB) and phosphate accumulating organisms (PAO) in aerobic granular sludge was investigated...journal article 2021
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Wei, P. (author), Uijttewaal, W.S.J. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)Accurate rheological characterisation of sewage waste activated sludge (WAS) is of high importance for downstream processing related to optimised sludge pumping and mixing, assessment of energy demands and overall process design. However, to elaborate rheological behaviour is often challenging under dynamic operational conditions in practice....journal article 2021
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Toja Ortega, S. (author), Pronk, M. (author), de Kreuk, M.K. (author)High concentrations of particulate COD (pCOD) in the influent of aerobic granular sludge (AGS) systems are often associated to small granule diameter and a large fraction of flocculent sludge. At high particulate concentrations even granule stability and process performance might be compromised. However, pilot-or full-scale studies focusing...journal article 2021