P.N.L. Lens

P.N.L. Lens
IHE Delft Institute for Water Education | UNESCO-IHE · Department of Environmental Engineering and Water Technology

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1,029
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Publications

Publications (1,029)
Article
Biological reduction of selenium oxyanions is widely used for selenium removal from wastewater. The process is, however, limited by the availability of a suitable, efficient and low cost electron donor. In this study, selenite and selenate reduction by waste activated sludge using hydrogen as the electron donor was investigated. Both selenite and s...
Article
Full-text available
Food waste (FW) generation has become one of the largest environmental concerns for human society. Thanks to its chemical features and its high biodegradability, FW can be used as starting platform to produce biocommodities. Lactic acid (LA) is one of those chemicals that is gaining the attention of industry and research for its important role in p...
Article
H2S removal performance by hollow fibre membrane bioreactors (HFMBs) was investigated for 271 days at ambient (20 ± 2 °C) temperature employing an inlet H2S concentrations up to 3600 ppmv and empty bed residence time (EBRT) of 187, 92 and 62 s. Different operating conditions including pH control (with or without), famine period, shock loads (4–72 h...
Article
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Lactic acid production through fermentation is an established technology, however, improvements are necessary to reduce the process costs and to decrease its market price. Lactic acid is used in many industrial sectors and its market has increased in the last decade for its use as the raw material for polylactic acid product. Using food waste as a...
Article
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Lignocellulosic residues (LRs) are one of the most abundant wastes produced worldwide. Nevertheless, unlocking the full energy potential from LRs for biofuel production is limited by their complex structure. This study investigated the effect of N-methylmorpholine N-oxide (NMMO) pretreatment on almond shell (AS), spent coffee grounds (SCG), and haz...
Article
Autotrophic denitrification using inorganic compounds as electron donors has gained increasing attention in the field of wastewater treatment due to its numerous advantages, such as no need for exogenous organic carbon, low energy input, and low sludge production. Tetracycline (TC), a refractory contaminant, is often found coexisting with nutrients...
Chapter
Present water-energy crisis and wastewater treatment issues can be addressed using advanced microbial fuel cells (MFC). It can provide sustainable solutions for treatment of wastewater ranging from simple sugars to complex industrial effluent along with simultaneous energy recovery. Such technology provide flexible platform for different electroche...
Article
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The energy potential of dissolved air floatation (DAF) slurry, a lipid-rich waste, is largely disregarded with the common practice of land spreading or landfilling. On the other hand, selenium (Se) contaminated wastewaters are perceived as unsuitable feedstocks because of their toxicity. This study aimed to evaluate the anaerobic co-digestion perfo...
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This study provided important insights on the anaerobic digestion (AD) of hazelnut skin (HS) by operating a fed-batch AD reactor over 240 days and focusing on several factors impacting the process in the long term. An efficient reactor configuration was proposed to increase the substrate load while reducing the solid retention time during the fed-b...
Article
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Lignocellulosic materials (LMs) are abundant feedstocks with excellent potential for biofuels and biocommodities production. In particular, nut and coffee wastes are rich in biomolecules, e.g. sugars and polyphenols, the valorisation of which still has to be fully disclosed. This study investigated the effectiveness of ultrasounds coupled with hydr...
Article
Securing a sustainable protein supply at the global level is among the greatest challenges currently faced by humanity. Alternative protein sources, such as second-generation microbial protein (MP), could give rise to innovative circular bioeconomy practices, synthesizing high-value bioproducts through the recovery and upcycling of resources from o...
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This study investigated the potential of granular activated carbon (GAC) supplementation to enhance anaerobic degradation of dairy wastewater. Two sequential batch reactors (SBR; 0.8 L working volume), one control and another amended with granular activated carbon, were operated at 37 oC and 1.5‐1.6 m/h upflow velocity for a total of 120 days (four...
Article
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Nanoparticles offer an alternative mean for heavy metals removal from aquatic environment. In this work we study the sequestering of nickel by biogenic selenium nanoparticles (SeNPs) both in native and in immobilized form in alginate matrix (alginate-SeNPs). The apparent sorption like process is attributed to the coordination chemistry of Ni with t...
Article
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H2S and NH3 are toxic, corrosive and odorous gases that often co-exist in gas streams emitted from industrial processes, including biogas produced in anaerobic digestion plants. A hollow fibre membrane bioreactor (HFMB) was tested for simultaneous biological removal of H2S and NH3 from raw biogas. The HFMB achieved a removal efficiency (RE) > 99% f...
Article
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The depletion of primary ores, the environmental concerns related to mining activities, and the need to promote circular economy has drawn attention to the recycling of metallic compounds. Bio-based technologies are suitable for metal recovery, as they operate under mild conditions (ambient temperature and pressure) and are ideal for treating low-c...
Article
The demand for value added compounds such as amylase, pyruvate and phenolic compounds produced by biological methods has prompted the rapid development of advanced technologies for their enhanced production. Nanobiohybrids make use of both the microbial properties of whole‐cell microorganisms and the light‐harvesting efficiency of semiconductors. P...
Article
The performance of Aspergillus niger pellets to remove selenite and tellurite from wastewater using batch and continuous fungal pelleted bioreactors was investigated. The acid hydrolysate of brewer’s spent grain (BSG) was utilized by A. niger as the electron donor for selenite and tellurite reduction. The dilution of BSG hydrolysate using mineral m...
Article
Simultaneous nitrification and denitrification (SND) was achieved in an MABR (membrane aerated biofilm reactor) system treating primary settled municipal sewage. Under ideal conditions, the total nitrogen (TN) concentration was reduced from approximately 50 mg/L to less than 5 mg/L. TN removal was highly variable ranging between 15 - 92% due to var...
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Globally, governments have increased their commitment to mitigate greenhouse gas (GHG) emissions. At the same time, the compostable bioplastic market is growing rapidly as many single-use petrochemical plastics are being banned internationally. A prospective consequential life cycle assessment approach was conducted to quantify the environmental en...
Article
Azo dyes wastewater is characterized by high-salinity, however, the biodegradation performance and mechanisms of azo dyes by aerobic granular sludge (AGS) under different salinity levels are still unclear. Herein, the results showed that the reactor performance was almost unaffected at low-salinity levels (0.5%-1.0% salinity), and the removal effic...
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This study examines the use of open circuit (OC) auxiliary electrodes to monitor changes on the bulk potential in a sediment microbial fuel cell (SMFC). This complements the cell voltage and electrode potential measurement obtained in closed circuit (CC), helping to understand the limitations of the system and facilitating its optimization. Duplica...
Article
The effects of rotating speed (120, 130, 140 and 150 rpm) of a photo-reactor on the self-sustaining algal-bacterial photo-granules sludge (ABPG) was investigated in this study. The ABPG process maintained good granular stability at 140 rpm with an integrity coefficient of 3.0% and excellent nutrient removal. The increases of the extracellular polym...
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Lignocellulosic wastes, such as brewery spent grain (BSG), represent valuable resources from a biorefinery perspective, being sources of both chemical and energy production. Improving degradation rates of these recalcitrant feedstocks is a necessity, and bioaugmentation with specialised microbial consortia can be a viable means of achieving this. S...
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The first observation of a polyhydroxyalkanoate (PHA) aggregate was in 1888 by Beijenrinck. Despite polyhydroxybutyrate (PHB) being the first type of PHA discovered, it was not extracted and characterized until 1925 by Maurice Lemoigne in France, even before the concept of “macromolecules” was known. After more than 30 years, in 1958, Wilkinson and...
Article
Inorganic-microbial hybrid systems have potential to be sustainable, efficient and versatile chemical synthesis platforms by integrating the light-harvesting properties of semiconductors with microbial cells. Here, we demonstrate light-driven photocatalytic semiconducting Aspergillus niger cells-ZnS nanoparticles for enhanced removal of the dye met...
Article
Biofuels, such as ethanol and butanol, obtained from carbon monoxide-rich gas or syngas bioconversion (solventogenesis) are an attractive alternative to traditional fermentation processes with merits of no competition with food production and sustainability. However, there is a lack of comprehensive understanding of some key process parameters and...
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Butanol is a potential renewable fuel. To increase the selectivity for butanol during CO fermentation, exogenous acetic acid and ethanol, exogenous butyric acid or endogenous butyric acid from glucose fermentation have been investigated using CO as reducing power, with a highly enriched Clostridium sludge. Addition of 3.2 g/L exogenous butyric acid...
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Membrane fouling has been the primary challenge limiting the application of electrodialysis (ED) technologies in wastewater treatment, particularly the wastewater containing abundant dissolved organic matter, such as the digested sludge centrate. This study proposed an electro-ion substitution modified electrodialysis (EIS-ED) system that can recov...
Article
Algal-bacterial granular sludge (ABGS) is a promising technology for wastewater treatment, benefiting from the synergetic interactions between algae and bacteria. However, the rapid start-up of the ABGS system is not trivial. Herein, a novel strategy was proposed by applying the algal-mycelial pellets (AMPs) as the primary nuclei for accelerating t...
Article
Benzene, toluene, and xylene (BTX) are volatile aromatic compounds used in industries, however, they are hazardous when released into the environment. BTX degradation by Aspergillus niger cells combined with semiconducting zinc sulfide (ZnS) nanoparticles was explored in batch systems. Experiments were conducted individually for benzene, toluene, a...
Article
The photo-granule process is an effective and economically feasible alternative for wastewater treatment, but little information is available regarding how to speed up the photo-granulation process. In this study, the effect of inoculum aerobic granular sludge (AGS) size on the start-up of the photo-granule process was investigated under low aerati...
Book
Rare earth elements (REE) have applications in various modern technologies, e.g., semiconductors, mobile phones, magnets. They are categorized as critical raw materials due to their strategic importance in economies and high risks associated with their supply chain. Therefore, more sustainable practices for efficient extraction and recovery of REE...
Chapter
Rare earth elements (REE) have applications in various modern technologies, e.g., semiconductors, mobile phones, magnets. They are categorized as critical raw materials due to their strategic importance in economies and high risks associated with their supply chain. Therefore, more sustainable practices for efficient extraction and recovery of REE...
Article
This study investigated the adsorption of gallium onto chemical and biogenic elemental tellurium nanoparticles. Biogenic elemental tellurium nanoparticles (BioTeNPs) were found to be a good adsorbent for the removal and recovery of gallium from aqueous solution with an adsorption capacity of 74 mg of Ga³⁺ per g BioTeNPs. The adsorption mechanism fo...
Chapter
Lignocellulosic materials (LMs) are the most abundant residues on the planet and have a huge potential for methane production. Several strategies have been tested to enhance the methane potential of LMs, with a particular emphasis on environmentally friendly and economically convenient pretreatments. This chapter revisits the potential of two chemi...
Chapter
Contamination of metal(loid)s and organic pollutants in soils has caused detrimental effects to the environment, so that there is a need to develop appropriate treatment approaches to resolve the soil pollution. In recent years, biochar produced from biowaste material has been widely used as a potential adsorbent in remediating organic and inorgani...
Chapter
Renewable energy resources, particularly biofuels, are gradually replacing the fossil fuel sources for energy. This will eventually enable an energy platform with reduced environmental pollution and greenhouse gas emissions. The present technologies and raw materials available for biofuel production have, however, not yet reached commercial scale d...
Article
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Autotrophic denitrification with biosulfur (ADBIOS) provides a sustainable technological solution for biological nitrogen removal from wastewater driven by biogenic S⁰, derived from biogas desulfurization. In this study, the effect of different biofilm carriers (conventional AnoxK™ 1 and Z-200 with a pre-defined maximum biofilm thickness) on ADBIOS...
Book
The depletion of fossil fuel reserves and concerns for environmental degradation due to the fossil fuel burning have led the scientific community to look for alternative renewable energy sources. Among the available renewable energy sources, bioenergy derived from biomass and waste resources have great potential to not only prevent environmental po...
Preprint
Full-text available
An anaerobic granular sludge was enriched to utilize H 2 /CO 2 in a continuous gas-fed up-flow anaerobic sludge reactor by applying operating conditions expected to produce acetic acid, butyric acid and ethanol. Three stages of fermentation were found: Stage I with acetic acid accumulation with the highest concentration of 35 mM along with a pH dec...
Article
Raw biogas generated in the anaerobic digestion (AD) process contains several undesired constituents such as H2S, CO2, NH3, siloxanes and VOCs. These gases affect the direct application of biogas, and are a prime concern in biogas utilization processes. Conventional physico-chemical biogas purification methods are energy-intensive and expensive. To...
Article
BACKGROUND Hydrogen sulfide (H2S) must be treated from its emission sources to avoid health risks, odour and corrosion. Conventional physico-chemical H2S removal technologies, e.g. membrane contactors or chemical scrubbers, have several limitations such as requirement of high amounts of absorption chemicals and energy. In contrast, biological H2S...
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Complex microbial communities in engineered environments can aggregate to form surface-attached biofilms. Others form suspended biofilms, such as methanogenic granules.
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Background Increasing amounts of food waste became a problem in the last decades. Sustainable methods to limit the impact of food waste on the environment are required. Food waste valorisation through lactic acid fermentation can be such a method by producing a valuable commodity from a cheap substrate. Lactic acid is a chemical with increasing mar...
Article
The need to reduce the climate impact of the transport sector has led to an increasing interest in the utilisation of alternative fuels. Producing advanced fuels through the integration of anaerobic digestion and power-to-fuel technologies may offer a solution to reduce greenhouse gas emissions from difficult to decarbonise modes of transport, such...
Article
Full-text available
Carbon monoxide (CO)-metabolizing Clostridium spp. were enriched from the biomass of a butanol-producing reactor. After six successive biomass transfers, ethanol production reached as much as 11.8 g/L with minor accumulation of acetic acid, under intermittent gas feeding conditions and over a wide pH range of 6.45–4.95. The molar ratio of ethanol t...
Article
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This study assessed selenium (Se)-enriched microalgae biomass produced in a pilot-scale raceway pond treating domestic wastewater and an extract thereof as biostimulant and biofertilizer. After producing the Se-enriched microalgae in a raceway pond treating domestic wastewater, the effect of Se-enriched microalgae biomass and an extract thereof on...
Article
Distinct microbial assemblages evolve in anaerobic digestion (AD) reactors to drive sequential conversions of organics to methane. The spatio-temporal development of three such assemblages (granules, biofilms, planktonic) derived from the same inoculum was studied in replicated bioreactors treating long-chain fatty acids (LCFA)-rich wastewater at 2...
Article
Full-text available
Biofilm-based algal cultivation has many advantages over the conventional suspended growth methods and has received increased attention as a potential platform for algal production, wastewater treatment (nutrient removal), and a potential pathway to supply feedstock for microalgae-based biorefinery attempts. However, the attached cultivation by def...
Article
Full-text available
Bearing in mind the metal rich composition of printed circuit boards (PCBs), this material represents a secondary source of valuable metals and offers an entrepreneurial opportunity in the metal sales market. Based on the ability of microorganisms to regenerate and produce the chemical oxidants that are responsible for metal leaching, bioleaching h...
Article
Full-text available
An anaerobic mixed culture able to grow on pure carbon monoxide (CO) as well as syngas (CO, CO2 and H2) that produced unusual high concentrations of butanol was enriched in a bioreactor with intermittent CO gas feeding. At pH 6.2, it mainly produced acids, generally acetic and butyric acids. After adaptation, under stress conditions of CO exposure...
Chapter
Full-text available
Selenium contamination of air, aquatic environments, soils and sediments is a serious environmental concern of increasing importance. Selenium has a paradoxical feature in bringing about health benefits under the prescribed level, but only a few fold increase in its concentration causes deleterious effects to flora and fauna, humans and the environ...
Chapter
Full-text available
Selenium contamination of air, aquatic environments, soils and sediments is a serious environmental concern of increasing importance. Selenium has a paradoxical feature in bringing about health benefits under the prescribed level, but only a few fold increase in its concentration causes deleterious effects to flora and fauna, humans and the environ...
Chapter
Full-text available
Selenium contamination of air, aquatic environments, soils and sediments is a serious environmental concern of increasing importance. Selenium has a paradoxical feature in bringing about health benefits under the prescribed level, but only a few fold increase in its concentration causes deleterious effects to flora and fauna, humans and the environ...
Article
Full-text available
Bioreduction of selenium oxyanions to elemental selenium is ubiquitous; elucidating the properties of this biogenic elemental selenium (BioSe) is thus important to understand its environmental fate. In this study, the magnetic properties of biogenic elemental selenium nanospheres (BioSe-Nanospheres) and nanorods (BioSe-Nanorods) obtained via the re...
Preprint
Full-text available
Distinct microbial assemblages are engineered in anaerobic digestion (AD) reactors to drive sequential conversions of organics to methane. The spatio-temporal development of three such assemblages (granules, biofilms, planktonic) derived from the same inoculum was studied in replicated bioreactors treating long-chain fatty acids (LCFA)-rich wastewa...
Article
This study demonstrated the simultaneous removal of lead (Pb) and selenium (Se) as lead selenide biomineralization using anaerobic granular sludge. The microbial community of the granular sludge was first enriched for 140 days in the presence of Pb(II) only, selenate and selenite only, Pb(II)+selenate, and Pb(II)+selenite. In the absence of Se, rem...
Article
Full-text available
Polylactic acid (PLA) is a compostable bio-based plastic that can be used for food packaging, potentially increasing separation of (packaged) food waste for targeted, more circular organic waste management via anaerobic digestion, industrial composting, or (in the future) insect protein meal feed production. Consequential life cycle assessment (LCA...
Article
Anaerobic technologies are consolidated for sewage treatment and are the core processes for mining marketable products from waste streams. However, anaerobic effluents are supersaturated with methane, which represents a liability regarding greenhouse gas emissions. Meanwhile, anaerobic technologies are not capable of nitrogen removal, which is requ...
Article
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This study compared the rates and microbial community development in batch bioassays on autotrophic denitrification using elemental sulfur (S0), pyrite (FeS2), thiosulfate (S2O32–), and sulfide (S2–) as electron donor. The performance of two inocula was compared: digested sludge (DS) from a wastewater treatment plant of a dairy industry and anaerob...