Gözde Özbayram

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• PhD
• Professor (Associate) at Istanbul University

The aim of this study was to determine the potential of bioaugmentation with cellulolytic rumen microbiota to enhance the anaerobic digestion of lignocellulosic feedstock. An anaerobic cellulolytic culture was enriched from sheep rumen fluid using wheat straw as substrate under mesophilic conditions. To investigate the effects of bioaugmentation on...

The aim of this study was to develop an effective bioaugmentation concept for anaerobic digesters treating lignocellulosic biomass such as straw. For that purpose, lignocellulose-degrading methanogenic communities were enriched on wheat straw from cow and goat rumen fluid as well as from a biogas reactor acclimated to lignocellulosic biomass (sorgh...

This study compares a less toxic hexane-based extraction with the modified Bligh-Dyer method for lipid extraction from dried Scenedesmus obliquus biomass, focusing on FAME yield and biodiesel quality. Additionally, various catalyst combinations were tested under consistent reaction conditions across both conventional methods and one- and two-step i...

The relationships between freshwater systems and agriculture are complex, and they intersect in many ways. Human interference with nitrogen and phosphorus cycles has become so intense that may be the effect of nutrient enrichment in freshwaters. Thus, this study aims to assess current (2022) and future (2032) water footprint (WF) of tea production...

The monitoring of drinking water quality is a vital public health concern together with taste and odour (T&O) episodes, an emerging global problem causing a loss of public trust to the quality of water. Our objective was to monitor water quality of an important drinking water source and also the production dynamics of geosmin and 2-methylisoborneol...

This study aimed to examine the bacterial, methanogenic archaeal, and eukaryotic community structure in both the midgut and hindgut of Pachnoda marginata larvae using an amplicon sequencing approach. The goal was to investigate how various diets and the soil affect the composition of these three‐domain microbial communities within the gut of insect...

Marine phytoplankton are widely used to monitor the state of the water column due to their rapid changes in response to environmental conditions. In this study, we aimed to investigate the coastal phytoplankton assemblages, including bloom-forming species using high-throughput sequencing of 18S rRNA genes targeting the V4 region and their relations...

A B S T R A C T The recalcitrance of lignin impedes the efficient utilization of lignocellulosic biomass, hindering the efficient production of biogas and value-added materials. Despite the emergence of anaerobic digestion as a superior alternative to the aerobic method for lignin processing, achieving its feasibility requires thorough characteriza...

Biodiesel production from microalgae is considered a sustainable alternative to fossil fuel sources. The economic feasibility of algae-based biodiesel is highly related to biomass, lipid and FAME yield of the species. Thus, optimization of the culture conditions plays an important role in biodiesel production. The aim of this study is to compare li...

The main objective of the study was to determine the effect of different dosages of NaOH alkali pre-treatment on the lignocellulosic structures and the methane production of crops’ residues. In this regard, NaOH pre-treatment was implemented with different dosages on three different crops’ residues: wheat, rye, and rice straws. Substrates were soak...

The importance of sustainable bioassessment and management of coasts to maintain good trophic status is increasing due to the high anthropogenic impacts on marine ecosystems. Diatoms are one of the most important assemblages and useful tools for assessing the state of the environment due to their advantages over other organisms such as short life s...

Lignin is one of the most substantial obstacles in the evaluation of lignocellulosic compounds. Although there are numerous approaches for the enhancement of lignin digestion in the literature, there has yet to be an optimized system to date. In this study, samples taken from Igneada floodplain forests were enriched anaerobically at 25 °C and 37 °C...

The main objective of the study was to determine the effect of different dosages of NaOH alkali pre-treatment on the lignocellulosic structures and the methane production of crops’ residues. In this regard, NaOH pre-treatment was implemented with different dosages on three different crops’ residues: wheat, rye, and rice straws. Substrates were soak...

The present study was designed to assess the effectiveness of the eDNA metabarcoding approach to determine the phytoplankton composition in the marine environment with a special focus on mucilage episodes in the Sea of Marmara. For this purpose, the samples were collected from 5 different sites located in the Sea of Marmara and the northern Aegean...

Küçükçekmece Lagoon, located inside the Istanbul metropolitan area, is connected to the Marmara Sea by a small canal. Due to the construction of a dam on the Sazlıdere stream, which is the most important feeding source for the lagoon, there has been a decrease in freshwater inflow, so the amount of salinity in the lagoon has started to increase. Wh...

The aim of this study was to investigate the water quality of rainwater harvesting ponds of Istanbul which are used for irrigation. For this purpose, samples were collected from 17 rainwater harvesting ponds during the summer of 2022 and selected physicochemical and biological characterization of these samples was carried out. Cyanobacterial bloom...

This study aimed to investigate the effects of thermal stratification and complete mixing conditions on the bacterial diversity of a deep alkaline lake. For this purpose, the water and sediment samples were collected during the winter turnover and stratification periods, and bacterial communities were assessed by metabarcoding. The results showed t...

The Marmara Sea has been facing a marine mucilage (sea snot) problem since November 2020. Mucilage is a harmless substance secreted by almost all plants, including phytoplankton. However, as the phytoplankton population grows, the amount of mucilage secreted increases. As a result, this substance can cover the surface of the sea and below, block th...

This prospective study was aimed to explore the bacterial diversity of marine mucilage developed in the Marmara Sea and the North Aegean Sea by metabarcoding. For this purpose, mucilage samples were collected from five different sampling locations, and the bacterial community structure was analyzed by 16S rRNA gene amplicon sequencing. The results...

Throughout history, the first and foremost role of urban water management has been the protection of human health and the local aquatic environment. To this end, the practice of (waste-)water treatment has maintained a central focus on the removal of pollutants through dissipative pathways. Approaches like – in the case of wastewater treatment – th...

Throughout history, the first and foremost role of urban water management has been the protection of human health and the local aquatic environment. To this end, the practice of (waste-)water treatment has maintained a central focus on the removal of pollutants through dissipative pathways. Approaches like – in the case of wastewater treatment – th...

This study sets a specific focus to explore the effectiveness of encapsulation of white-rot fungi as a novel biological pretreatment strategy on biogas production in anaerobic digesters. For this purpose, Trametes versicolor culture was entrapped in Ca-alginate beads and used in a fungal pretreatment step prior to co-digestion of cow manure, food w...

The water intake of a drinking water treatment plant (DWTP) in Central Italy was monitored over six bloom seasons for cyanotoxin severity, which supplies drinking water from an oligo-mesotrophic lake with microcystin levels up to 10.3 μg/L. The historical data showed that the water temperature did not show extreme/large seasonal variation and it wa...

Water supply and reuse through non-conventional water resources can significantly decrease the stress on natural water resources. Decentralized systems can help not only to alleviate issues of water security in arid areas, but also to create a sustainable framework within a circular economy. Although these small-scale innovative technologies are ab...

Diatoms are one of the major algal groups having an important role in the aquatic systems in which they constitute the main primary production with dinoflagellates in the coastal regions, and can contribute to photosynthesis at great rates. There had been intense effort to reveal diatom community with light microscopy (LM) and scanning electron mic...

Lake Iznik is one of the largest lake of Turkey covering 308 km ² surface area with 65 m max. depth. The lake has alkaline characteristics (Akcaalan et al. 2014). It is a mesotrophic lake that becomes stratified between June-September and well mixed between October-April. Although there are almost 200 lakes in Turkey, there is very little published...

The objectives of this study are to monitor the physicochemical properties of two freshwater lakes with different chemical characteristics and trophic status over a year (2019) and assess the bacterial diversity by a high-throughput sequencing method for a certain time. Carlson Trophic Index analysis revealed that, whereas the deep lake, Iznik Lake...

This paper aims to contribute to the understanding of bacterial community patterns of the lakes of İğneada Floodplain Forest by metabarcoding approach. Within this scope, surface water samples were collected from three lakes located in the area namely Mert Lake, Hamam Lake, and Saka Lake, and the bacterial diversity was assessed by a high throughpu...

The conversion of renewable resources into value-added products such as bioenergy is one of the growing concerns of bioeconomy strategy. Within this concept, assessing the proper combination of local wastes has major importance. This study set out to assess the feasibility of using spent tea waste as a single and co-substrate on anaerobic digestion...

The development of innovative technologies in wastewater treatment create the concept of biorefinery in wastewater treatment plants (WWTPs), placing anaerobic processes in the highlight. Starting from the conventional anaerobic treatment processes to ‘closing the loop’ scheme, next generation WWTPs are ready to serve for water, energy and materials...

Combined sewer overflows (CSOs) are of major environmental concern for impacted surface waterbodies. In the last decades, major storm events have become increasingly regular in some areas, and meteorological scenarios predict a further rise in their frequency. Consequently, control and treatment of CSOs with respect to best practice examples, innov...

Organic matter degradation and bacterial communities associated to the thermophilic phase of composting were compared using two different types of anaerobic digestates, one from a sewage sludge digester (SD), and the other from an agricultural digester (AD). The composting process exhibited similar variations in temperature, pH, moisture content an...

Microbial community compositions and functions of freshwater ecosystems vary due to the environmental parameters and water chemistry. Transient bloom events play a crucial role on the community profiles. In this study, a specific focus was set to provide a snapshot of the bacterial community composition in Lake Sapanca, associated with cyanobacteri...

The aim of this review is to give a summary of natural lignocellulose-degrading systems focusing mainly on animal digestive tracts of wood-feeding insects and ruminants in order to find effective strategies that can be applied to improve anaerobic digestion processes in engineered systems. Wood-feeding animals co-evolved with symbiotic microorganis...

The presence of poorly biodegradable components in lignocellulosic biomass limits the methane recovery in anaerobic digesters. The main reason to go for aerobic pretreatment before anaerobic digestion (AD) is to enable enzymatic cleavage of the aromatic rings in lignin by oxygen since it cannot be efficiently degraded under anaerobic conditions. In...

The effects of selected process parameters (i.e., temperature, inoculum to substrate ratio [I:S], and inoculum source) on methane production and microbial community structure were investigated in lignocellulose‐based anaerobic digestion tests. The results highlighted that dynamic response of microbial communities in changing process parameters subs...

Nanomaterials (NMs) commercially used for various activities mostly end up in landfills. Reduced biogas productions reported in landfill reactors create a need for more comprehensive research on these greatly-diverse microbial pools. In order to evaluate the impact of one of the most widely-used NMs, namely nano-zinc oxide (nano-ZnO), simulated bio...

Energy-efficient biogas reactors are often designed and operated mimicking natural microbial ecosystems such as the digestive tracts of ruminants. Anaerobic fungi play a crucial role in the degradation of lignocellulose-rich fiber thanks to their high cellulolytic activity. Fungal bioaugmentation is therefore at the heart of our understanding of en...

This particular study set out to demonstrate alterations on the microbial community of the oxic-settling-anaerobic/anoxic (OSA)process treating real domestic wastewater by changing interchange ratios (IRs). The sludge yield of systems operated at different IRs (1/13, 1/17 and 1/20)to assess sludge reduction was used to analyze microbial community c...

Cattle manure is frequently used as an inoculum for the start-up of agricultural biogas plants or as a co-substrate in the anaerobic digestion of lignocellulosic feedstock. Ruminal microbiota are considered to be effective plant fiber degraders, but the microbes contained in manure do not necessarily reflect the rumen microbiome. The aim of this st...

Three different bioaugmentation cultures enriched from natural and engineered cellulolytic environments (cow and goat rumen, a biogas reactor digesting sorghum biomass) were compared for their enhancement potential on the anaerobic digestion of wheat straw. Methane yields were determined in batch tests using the Automatic Methane Potential Test Sys...

Increased demand in municipal and industrial facilities has caused growing number of solid wastes generation in the last decades. In this regard, it is necessary to develop sustainable management strategies for maintaining environmental quality. As a developing country, waste management is recognized as a priority issue in Turkey and new policies a...

Anaerobic co-digestion of cow manure (CM) and barley (Hordeum vulgare, HV) was evaluated in terms of biochemical methane potentials with respect to five different CM to HV mixing ratios of 1:0, 2:1, 1:1, 1:2, and 0:1 based on volatile solids (VS) contents. Bacterial community composition of the seed sludge was examined using 454 pyrosequencing of 1...

Pharmaceutical production industries are one of the main sources of antibiotics, and they release considerable amounts of antibiotics to ecosystem. Antibiotics usually present as mixtures in treatment plants and have negative effect on biological processes. In this study, batch acute tests were performed to assess the inhibitory impacts of selected...

This study evaluates the joint effects of erythromycin-sulfamethoxazole (ES) combinations on anaerobic treatment efficiency and the potential for antibiotic degradation during anaerobic sequencing batch reactor operation. The experiments involved two identical anaerobic sequencing batch reactors. One reactor, as control unit, was fed with synthetic...

In this study, anaerobic treatability of diluted chicken manure (with an influent feed ratio of 1 kg of fresh chicken manure to 6 L of tap water) was investigated in a lab-scale anaerobic sludge bed (ASB) reactor inoculated with granular seed sludge. The ASB reactor was operated at ambient temperature (17-25°C) in order to avoid the need of externa...

The surface area of Ergene Basin is approximately 26400 km². Topographic elevations observed at the down land are: Istranca Mountains in the North, the continuing part of the North Anatolian mountain chains and Javas in the south (Ketin, 1983). Ergene Basin has a rainfall area of 10730 km2 and yearly mean flow is about 28 m3/s (Ordu and Demir, 2007...

Pharmaceutical wastewaters contain high levels of recalcitrant soluble organics and residual antibiotics (Ji et al., 2013). These wastes which are classified as industrial wastewaters can cause a serious pollution to the aquatic environment (Kasprzyk–Hordern et al., 2008; Sui et al., 2010), so that low concentrations of many pharmaceuticals, includ...