Florencia Saravia

Florencia Saravia
DVGW-Forschungsstelle am Engler-Bunte-Institut des Karlsruher Instituts für Technologie (KIT)

PhD

About

41
Publications
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405
Citations

Publications

Publications (41)
Article
Fouling formation in membrane distillation limits process stability and could cause besides wetting a rapid flux decrease making the process inefficient. Process performance is conventionally assessed by flux monitoring. Optical Coherence Tomography (OCT) enables in-situ visualization and quantification of fouling layers dominated by scaling in a f...
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Full-text available
In this work, the concentration polarization layer (CPL) of sulphate in a cross-flow membrane system was measured in-situ using Raman microspectroscopy (RM). The focus of this work is to introduce RM as a new tool for the study of mass transfer inside membrane channels in reverse osmosis (RO) and nanofiltration (NF) generally. Specifically, this wo...
Article
Full-text available
Stricter environmental regulation policies and freshwater as an increasingly valuable resource have led to global growth of zero liquid discharge (ZLD) processes in recent years. During this development, in addition to water, the recovery of recyclable materials, e.g. salts, from industrial wastewater and brines is considered more frequently. Withi...
Article
This study aims to evaluate the application of ultrafiltration technology for the separation of particles and oil droplets and the recovery of ammonia from hydrothermal liquefaction (HTL) wastewater. Real HTL wastewater from the hydrothermal liquefaction of municipal sewage sludge was used in this study. Experiments were carried out using a submerg...
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Full-text available
Intensive livestock farming has negatively impacted the environment by contributing to the release of ammonia and nitrous oxide, groundwater nitrate pollution and eutrophication of rivers and estuaries. The nitrogen footprint calculator has predicted the large impact of meat production on global nitrogen loss, but it could not form the relationship...
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Antimicrobial resistances are emerging as one main threat to worldwide human health and are expected to kill 10 million people by 2050. Intensive livestock husbandry, along with biogas digestate, are considered as one of the biggest ARG reservoirs. Despite major concerns, little information is available on the diversity and abundance of various ARG...
Article
The understanding of fouling mechanisms makes it possible to develop controlling strategies to optimize membrane performance. In this work, optical coherence tomography (OCT) was used for in-situ characterization of biomass occluding the feed channels of low-pressure reverse-osmosis membrane modules used to treat a feed stream with high organic loa...
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This study aims to evaluate the application of ceramic ultrafiltration membranes in the crossflow mode for the separation of particles and oil in water emulsions (free oil droplets and micelles) from hydrothermal-liquefaction wastewater (HTL-WW) from the hydrothermal liquefaction of municipal sewage sludge. The experiments were carried out using on...
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The livestock industry negatively impacts the environment by producing high organic and mineral loaded manure and wastewater. On the contrary, manure is also considered as the major focal point of resource recovery. The microfiltration (MF) process in manure treatment is well known for being the least complex and highly energy efficient. However, t...
Article
Intensive livestock farming has negatively impacted the environment by contributing to the release of ammonia and nitrous oxide, groundwater nitrate pollution and eutrophication of rivers and estuaries. However, the nutrient rich manure has always been a major focal point of resource recovery. Microfiltration has proven to be the least complex and...
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Full-text available
The aim of this study is the utilization of membrane distillation (MD) in the treatment of hydrothermal liquefaction wastewater (HTL-WW) to recover ammonium in the condensate. Experiments were carried out using MD under air-gap configuration with HTL-WW pretreated via Ultrafiltration. The results showed membrane stability in long-term operations, u...
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This work deals with the optimization of the concentration of volatile fatty acids (VFAs) using low-pressure reverse osmosis (LPRO) membranes. Membrane filtration of a synthetic solution simulating the product of biomass hydrolysis was performed. Experiments were run on two flat-sheet XLE membranes under 22 and 25 bar in continuous operation mode....
Article
Heavy metal-ion pollution in water is a serious problem for the environment, and membrane filtration technologies such as nanofiltration (NF) have become viable treatment alternatives. However, it is necessary to understand the performance of NF as a function of effluent composition and membrane surface charge properties. This work evaluated first...
Article
The formation of an inorganic deposit layer (scaling) is one of the most critical challenges affecting the long-term stability of membrane distillation processes applied in desalination applications. The consequences are a reduced permeate flux and a lowered permeate quality e.g., throughout wetting. Conventionally, scale formation is assessed base...
Article
In this study, lab-scale batch fermentation tests were carried out at mesophilic temperature (30 °C) to examine the influence of inoculum type, pH-value, and thermal pretreatment of substrate on propionic acid production from dog food. The selected inocula comprised a mixed bacterial culture, milk, and soft goat cheese. The batch tests were perform...
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Full-text available
BACKGROUND In this study, the enhancement of propionic acid production from a model feedstock mimicking kitchen waste was investigated. For that purpose, two operational runs of a semi‐continuous anaerobic hydrolysis reactor were carried out at a pH value of 6.0 ± 0.1 and mesophilic (30°C) temperature. Two different types of inocula, a mixed microb...
Article
Two-stage biogas systems consisting of a CSTR-acidification reactor (AR) and an anaerobic filter (AF) were frequently described for microbial conversion of food and agricultural wastes to biogas. The aim of this study is to investigate the integration of a membrane filtration step in two-stage systems to remove inert particles from hydrolysate prod...
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For an undisturbed operation of two-stage high-pressure fermentation up to 100 bar, a particle-free hydrolysate appears to be necessary. This is even more important if the second stage, i.e., the methane reactor, is designed as fixed bed. Here, we present the potential of microfiltration membranes as separation unit after the first stage, which is...
Article
Polymeric multichannel hollow fiber membranes were developed to reduce fiber breakage and to increase the volume-to-membrane-surface ratio and consequently the efficiency of filtration processes. These membranes are commonly used in ultrafiltration and are operated in in-out dead-end mode. However, some of the filtration details are unknown. The fi...
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Background: A future bioeconomy relies on the development of technologies to convert waste into valuable compounds. We present here an attempt to design a biotechnological cascade for the conversion of vegetable waste into acetoin and electrical energy. Results: A vegetable waste dark fermentation effluent containing mainly acetate, butyrate and...
Article
The two-stage high-pressure fermentation (HPF) process enables the production of methane at high operating pressure. Pressure significantly reduces the energy needed for injecting the produced biogas into the gas grid by 45–60%. It also allows for incorporating large parts of the necessary biogas upgrading process into the synthesis step. As a resu...
Article
Nanofiltration (NF) can be considered as an interesting alternative to remove disinfection by-products especially trihalomethanes (THM). However, the results have been contradictory in the literature regarding THM rejection. In this work, the rejection of four THM by three commercial NF membranes of different materials was investigated, including t...
Article
Trihalomethanes (THM) are the most typical disinfection by-products (DBPs) found in public swimming pool water. DBPs are produced when organic and inorganic matter in water reacts with chemical disinfectants. The irregular contribution of substances from pool visitors and long contact time with disinfectant make the forecast of THM in pool water a...
Article
Application of nanofiltration (NF) membranes has increased during the last years: many industries from drinking water treatment and water re-use to the pharmaceutical and food industry deal with the application of NF and its drawbacks. One of the main problems of membrane technology is fouling. Fouling during NF is a complex problem because of the...
Article
The combination of ultrafiltration (UF) and powdered activated carbon (PAC) has gained in importance over the last 15 years. The aim of applying PAC-UF hybrid processes is to improve the rejection capacity and the performance of membrane processes. In this work the influence of PAC-addition on membrane flux decline and fouling formation was studied...
Article
We have studied a prehispanic bronze disc of 366 mm diameter, 3.340 kg, made ca. 500-900 AD from Argentina Northwest, employing metallurgical techniques, SEM and EDS, x-ray radiography and microprobe. We found that this piece was made by melting Cu and Sn in a double matrix. It was found that the piece was well filled but with small bubles coming f...
Article
In investigations concerning the photocatalytic degradation by TiO(2) usually filter discs with a pore size of 0.22 mum and 0.45 mum are used for the removal of photocatalyst particles in aqueous suspensions. In this study the effective rejection of suspended particles by microfiltration in different types of membrane modules and with different mem...
Article
Adsorption-membrane hybrid systems present an interesting alternative for the treatment of contaminated waters. This study aims to understand the role of NOM on membrane performance and on removal of pharmaceuticals during the combined application of powdered activated carbon and submerged membranes. A focus was on investigations of the interaction...
Article
The application of membrane filtration in the treatment of spent filter backwash water (SFBW) permits efficient removal of microorganisms, suspended particles and organic substances, depending on the used membrane molecular weight cut-off. However, flux decline, due to deposits and adsorption of substances (salts, colloids, organics, particles, mic...
Article
Interactions between dissolved organic substances (dissolved organic matter and two model substances), ions (Na + and Ca 2+) and the membrane surface were investigated using a submerged membrane module. The membrane permeability, the fouling formation and the rejection were significantly influenced by the solution's ionic strength and especially by...
Article
In this study natural organic matter (NOM) removal by ultra- and nanofiltration from four different raw waters was investigated. The experiments were carried out with a flat channel cross flow unit and with a pilot unit equipped with two parallel spiral wound modules. NOM rejection was characterized using 13C- MAS-NMR spectroscopy, scanning electro...
Article
The transport of metal ions (Al, Fe, Zn, Pb) complexed by natural organic matter (NOM) was investigated by column experiments. Direct breakthrough of metal-NOM complexes was observed after elution of one bed volume for Al, Fe, and Pb, but not for Zn. This observation cannot be understood assuming local thermodynamic equilibrium in the columns. Henc...
Article
Los discos o placas de metal fueron una de las expresiones arqueológicas típicas del Noroeste Argentino (NOA), habiéndose registrado también hallazgos de ejemplares en áreas andinas aledañas a la región. Se propuso un esquema evolutivo de las características formales y estilísticas de estas piezas desde momentos formativos. De contextos tempranos c...

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Project (1)
Project
Within this project, the partners will demonstrate the conversion of biomass to biogas and the production and utilization of Bio-LNG. More details on: www.probiolng.de