Burak Demirel

Burak Demirel
Bogazici University · Institute of Environmental Sciences

PhD

About

48
Publications
46,898
Reads
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4,557
Citations
Additional affiliations
September 2009 - present
Bogazici University
Position
  • Faculty Member
August 2005 - December 2008
Hochschule für Angewandte Wissenschaften Hamburg
Position
  • PostDoc Position

Publications

Publications (48)
Article
Full-text available
Turkish government aimed to increase the installed capacities of coal-fired power plants (CFPPs) according to several policies and strategic plans published in recent years. Energy production from CFPPs and subsidizing the coal sector were selected for reducing the import dependency as a cheaper option. CFPPs with gaseous emissions as well as fly a...
Article
Full-text available
Organic fraction of the municipal waste (OFMSW) is a valuable resource for biogas production through anaerobic digestion (AD). Bioplastics is widely used in daily activities, especially with food related items and collection bags, and can reach biogas plants through separate collection of OFMSW. PHAs, starch and cellulose based polymers with differ...
Article
Levels, composition and fate of microplastics (MPs) were investigated along different compartments of a secondary wastewater treatment plant (WWTP) with nutrient removal on the northern Sea of Marmara coast (Istanbul, Turkey). When all samples were combined, fibers were found to be the most dominant particles, followed by hard fragments. 500–1000 μ...
Article
Rare earth elements (REEs) are commercially used in an increasing number of critical or widely popular consumer and industrial products. Neodymium (Nd) element has emerged in recent years as one of the most critical REE, due to risks associated with its security of supply at required amounts. It has been widely reported that end of life (EoL) consu...
Article
Livestock production residues are commonly used as substrates in agricultural biogas plants for energy recovery. Cattle and poultry manure can be converted to biogas in farm-scale or centralized biogas plants to produce heat and power. This study investigated batch anaerobic digestion of chicken manure coupled with a biological pre-treatment step....
Article
Full-text available
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...
Article
Full-text available
Waste mobile phones constitute one of the fastest growing Waste Electrical and Electronic Equipment (WEEE) types all over the world due to technological innovations and shortening of their life span. They contain a complex mix of various materials, such as basic metals, precious metals and rare earth elements and represent an important secondary ra...
Article
Nano-ZnO enters landfills mostly through disposal of cosmetics, sunscreens and catalysts. However, its effects on waste degradation are still unclear. In this paper, a fuzzy-based model is proposed to predict biogas and methane production from simulated bioreactor landfill with and without ZnO nanomaterials. Eight deterministic inputs (pH, RedOx po...
Chapter
As a result of extensive use of engineered nanomaterials (ENMs) in consumer products, significant amounts of ENMs are eventually released to the environment and find their way to wastewater treatment plants, incineration plants and landfills. Recent concerns about the potential impacts of these materials on the environment and human health, have di...
Book
Full-text available
Welcome to the final conference of the COST Action ES1205. The most important aim of our Action was to create a pan-European network and, glancing at the book of abstracts – I can say – we were successful. The majority of contributions you will find here were influenced by our activities. The foundations of this Action however, must certainly be th...
Article
Extensive use of nanomaterials in commercial consumer products and industrial applications eventually leads to their release to the waste streams and the environment. Nano-ZnO is one of the most widely-used nanomaterials (NMs) due to its unique properties. It is also known to impact biological processes adversely. In this study, the effect of nano-...
Article
Aims: Here we report how different cell disruption methods, PCR primers and in-silico analyses can seriously bias results from microbial population studies, with consequences for the credibility and reproducibility of the findings. Our results emphasize the pitfalls of commonly used experimental methods that can seriously weaken the interpretation...
Article
The extensive production of conventional plastics and their use in different commercial applications poses a significant threat to both the fossil fuels sources and the environment. Alternatives called bioplastics evolved during development of renewable resources. Utilizing renewable resources like agricultural wastes (instead of petroleum sources)...
Article
Despite widespread use of engineered nanomaterials (ENMs) in commercial products and their potential disposal in landfills, the fate of ENMs in solid waste environments are still not well understood. In this study, the leaching behavior of nano ZnO -one of the most used ENMs- in fresh municipal solid waste (MSW) was investigated. Batch reactors con...
Article
Engineered nanomaterials (ENMs) are commonly used in commercial products nowadays. As a result of increasing demand and consumption, a greater amount of nanoparticle (NP) containing products eventually reach wastewater treatment plants, incineration plants and landfills. Anaerobic digestion (AD) processes are extensively used for stabilization of s...
Article
Anaerobic batch experiments were conducted at mesophilic temperatures to investigate the possibility of biogas recovery from tannery sludge originating from a tannery wastewater treatment process. According to preliminary findings, the highest biogas yield was obtained as 0.172 L biogas/g VS added within an inoculum to substrate (I:S) ratio of 1:10...
Article
Nanoparticles have been used widely in industry and consumer products in recent years. Most of the engineered nanoparticles (NPs) eventually enter municipal wastewater treatment systems (WWTP) through sewers. In this experimental study, the impact of nano-TiO2, nano-ZnO, and nano-Ag on methanogenesis was investigated during mesophilic batch anaerob...
Article
Abstract The objective of this experimental study was to demonstrate the impact of trace metal supplementation, namely nickel (Ni), cobalt (Co) and molybdenum (Mo), on the methane yields obtained from batch mesophilic anaerobic digestion of maize silage as mono-substrate. The maize silage used in this experimental work initially lacked Ni and Co. T...
Article
The author reviews the current state of recent microbial community studies conducted on lab-pilot-full scale agricultural biogas digesters fed with energy crops operated in mono- and codigestion modes with or without use of manure as cosubstrate. It is commonly concluded by researchers that methane (CH4) formation mostly resulted from conversion of...
Article
Fruit, vegetable, flower waste (FVFW), dairy products waste (DPW), meat waste (MW) and sugar waste (SW) obtained from a supermarket chain were anaerobically digested, in order to recover methane as a source of renewable energy. Batch mesophilic anaerobic reactors were run at total solids (TS) ratios of 5%, 8% and 10%. The highest methane yield of 0...
Article
Full-text available
In this experimental study, the biogas digestate from mesophilic batch anaerobic co-digestion of poultry manure and an agricultural residue, sunflower hulls, was characterized, particularly in terms of heavy metal content, in order to evaluate whether the biogas digestate was suitable for land applications. Ni, Zn, Cu, Pb, Cr, Cd, and Hg were detec...
Article
Proper management of waste streams and residues from agro-industry is very important to prevent environmental pollution. In particular, the anaerobic co-digestion process can be used as an important tool for safe disposal and energy recovery from agro-industry waste streams and residues. The primary objective of this laboratory-scale study was to d...
Article
Full-text available
The availability of trace metals as micro-nutrients plays a very significant role on the performance and stability of agricultural biogas digesters, which are operated with energy crops, animal excreta, crop residues, organic fraction of municipal solid wastes or any other type of organic waste. The unavailability of these elements in biogas digest...
Article
Full-text available
Anaerobic digestion processes have often been applied for biological stabilization of solid and liquid wastes. These processes generate energy in the form of biogas. Recently, high-rate methane and hydrogen fermentation from renewable biomass has drawn much attention due to current environmental problems, particularly related to global warming. The...
Article
The potential, opportunities and drawbacks of biogas technology use in Turkey are evaluated in this paper. Turkey is dependent on foreign sources of energy. Therefore, use of biogas technology would provide a safe way of waste disposal and recovery of renewable energy, particularly from a sustainable domestic source, which is less unlikely to be in...
Article
The aim of this laboratory-scale study was to investigate the long-term anaerobic fermentation of an extremely sour substrate, an energy crop, for continuous production of methane (CH4) as a source of renewable energy. The sugar beet silage was used as the mono-substrate, which had a low pH of around 3.3–3.4, without the addition of manure. The mes...
Article
The presence of organic materials plays an important role in the fate of heavy metals that are co-disposed together with municipal solid wastes. As a part of an on-going research project, which aims to find out the most effective attenuation mechanism of heavy metal removal in landfills, sorption batch experiments were performed to assess the sorpt...
Article
Continuous bio-methanization of an energy crop, namely the beet silage, was investigated in this laboratory-scale work as mono-substrate, using a mesophilic biogas digester controlled by a fuzzy logic control (FLC) technique and without using any supplementing or buffering agent, despite the low pH of the substrate around 3.80. The temperature, pH,...
Article
Two lab-scale, mesophilic anaerobic digesters (namely reactors R-1 and R-2) were operated simultaneously for continuous production of biogas from fodder beet silage as mono-substrate. The digesters were operated by a control system, developed at HAW Hamburg, which allowed an automatic auto-feeding up to a given maximum set-point. Within a period of...
Article
Full-text available
The performance and the behaviour of the microbial community of an anaerobic mesophilic biogas digester fed with the sugar beet silage (SBS) were investigated in this laboratory-scale work. The biogas digester was operated using a fuzzy logic control (FLC) technique, which was developed at the Hamburg University of Applied Sciences. The SBS, which...
Article
Full-text available
A fuzzy logic control (FLC) system was developed at the Hamburg University of Applied Sciences (HAW Hamburg) for operation of biogas reactors running on energy crops. Three commercially available measuring parameters, namely pH, the methane (CH4) content, and the specific gas production rate (spec. GPR = m(3)/kg VS/day) were included. The objective...
Article
Full-text available
The aim of the study was to investigate the long-term fermentation of an extremely sour substrate without any addition of manure. In the future, the limitation of manure and therefore the anaerobic digestion of silage with a very low buffering capacity will be an increasing general bottleneck for energy production from renewable biomass. During the...
Article
Full-text available
Among different conversion processes for biomass, biological anaerobic digestion is one of the most economic ways to produce biogas from various biomass substrates. In addition to hydrolysis of polymeric substances, the activity and performance of the methanogenic bacteria is of paramount importance during methanogenesis. The aim of this paper is p...
Article
Full-text available
Single-stage continuous anaerobic conversion of sugar beet silage without manure to methane was investigated in this experimental work, using a laboratory-scale mesophilic anaerobic biogas digester. The sugar beet silage had an extreme low pH of 3.3. The reactor was operated in a hydraulic retention time (HRT) range of between 95 and 15 days, and a...
Article
Following the attacks on America on September 11, a comprehensive review was carried out to examine London’s resilience and its ability to respond to, and recover from, a major or catastrophic attack. After the completion of the review it was discovered that while London had good tried and tested procedures for dealing with “conventional” – e.g. ca...
Article
This study examined the behaviour of the microbial population in an anaerobic reactor, in terms of changes in numbers of total bacterial community, autofluorescent methanogens, non-methanogens and morphology of the autofluorescent methanogens, using epifluorescence microscopy and microbiological enumeration techniques. A laboratory-scale, continuou...
Article
Full-text available
Anaerobic treatment is often reported to be an effective method for treating dairy effluents. The objective of this paper is to summarize recent research efforts and case studies in anaerobic treatment of dairy wastewaters. The main characteristics of industrial dairy waste streams are identified and the anaerobic degradation mechanisms of the prim...
Article
The performance of a laboratory-scale mesophilic acidogenic reactor was evaluated in this study, in terms of volatile fatty acid production and distribution, with respect to variations in hydraulic retention time (HRT). The continuous flow-completely mixed anaerobic reactor, coupled with a conventional gravity settling tank and a continuous recycli...
Article
Full-text available
The effects of changes in composition of a volatile fatty acid mixture (namely acetic, propionic and butyric acids) fed to a methanogenic upflow filter reactor (UFAF) were investigated in terms of reactor chemical oxygen demand (COD) removal efficiency and biogas production level. A mixed substrate consisting of differing proportions of VFAs (on a...
Article
Full-text available
This review provides a detailed comparative summary of the recent and current research activities in the area of two-phase anaerobic digestion processes. The acid phase and the methane phase are first evaluated, individually, from microbiological, kinetic and modelling, process optimization, operation and control, inhibition, and toxicity points of...
Article
Full-text available
Applicability of the ferrite process in industrial wastewater treatment was investigated in this study. Preliminary experiments were carried out on synthetic wastewater samples, bearing copper, nickel, and zinc cations, to determine the optimum experimental conditions providing ferrite formation and satisfactory metal removal rates from solutions....

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Project
Fate and impact of NPs during waste stabilization in landfills, which play a very crucial role in integrated waste management systems, is mostly unknown. Moreover, there are no other studies in the literature that investigated the long term impact of nano-ZnO in simulated landfills. For this reason, aim of this study will be understand the fate, transport and impact of nano-ZnO on waste stabilization including landfill gas generation.