Güçlü Insel

Istanbul Technical University · Department of Environmental Engineering

In this study, the effect of anaerobic hydrolysis rate on biogas production was investigated with mesophilic digesters in seven large-scale wastewater treatment plants. A linear correlation was determined between the percentage of primary sludge mass in the total sludge fed to the digester and the overall anaerobic hydrolysis rate. The anaerobic hy...

The biodegradation of raw wastewater for an organized industrial zone has been studied by means of dedicated respirometric and analytical experiments. The experimental results indicated that the investigated industrial wastewater contains mainly the soluble (slowly) hydrolysable fraction of chemical oxygen demand (COD) (58%) while readily biodegrad...

Moving bed biofilm technology is a successful and promising biological treatment process considered for cost-effective management of wastewaters. In this study, a hybrid moving bed biofilm pilot plant was operated and obtained results were compared with simulation results of two biological processes: a conventional Biological Nutrient Removal (BNR)...

A lab-scale granular sludge sequencing batch reactor (G-SBR) system was operated using synthetic wastewater. The total nitrogen removal efficiency of 85% was obtained together with the achievement of complete total phosphorus removal with average granule diameter of 400 µm. Dual-step nitrification and denitrification model with fixed biofilm thickn...

The present study investigated the deviations of operational parameters of a large-scale wastewater treatment plant (WWTP) from design basis through combining dedicated batch experiments with full-scale dynamic modeling results. The long-term process performance of a full-scale biological nutrient removal (BNR) plant equipped with anaerobic sludge...

Polyhydroxyalkanoates (PHAs) as the next-generation bio-based polymers offer a renewable alternative to traditional petroleum-based counterparts. They can be derived from a wide variety of high carbon content feedstocks including food, biofuel, agricultural products, and carbon dioxide. PHAs have the potential to replace petroleum-based polymers in...

The structure of existing activated models is inherently deficient in reflecting the major role of the membrane filtration. The study developed a novel model, MASM, for the membrane activated process. The effective filtration size imposed by the membrane module, entrapping larger particles, was adopted as the basis of the proposed model. The model...

The increase in the occurrence of the pharmaceuticals in the environmental compartments is becoming emerging concern as it reflects their inefficient treatment in the wastewater treatment plants which are the main sources of these micropollutants. Non-steroidal anti-inflammatory drugs (NSAIDs) are one of the most commonly prescribed and frequently...

Food industry wastewater (FIWW) streams with high organic content are among the most suitable and inexpensive candidates for polyhydroxyalkanoate (PHA) biopolymer production. Due to its high organic acid content, pickle industry wastewater (PIWW), can be considered as one of the prospective alternative for PHA production. In this context, this stud...

The aim of this study was to investigate the efficacy of a hybrid biofilm pilot-scale treatment plant, designed with a novel configuration by the integration of a fixed-film system, to improve nitrogen removal. The pilot-scale system was established at a wastewater treatment plant in Istanbul and operated based on stream separation following a proc...

ZET İklim değişikliğine bağlı olarak derelerce taşınacak sediment miktarında artış beklenmektedir. İstanbul İli sınırları içindeki dere ve dere ağzı bölgelerinden sedimentin (dip çamuru) taranması, nakledilmesi ve depolanması süreçlerinde karbon emisyonuna neden olunmaktadır. Sediment miktarında beklenen artışla doğru orantılı olarak emisyon değeri...

BACKGROUND The paper offers a novel interpretation of microbial mechanisms and evaluates the assets of contact stabilization (CS) using multi‐component modelling. A model structure re‐defining microbial processes is adopted, where the function of the contact tank was limited to the utilization of soluble substrate fractions and that of the stabiliz...

This study evaluated the microbial behavior of activated sludge systems operated with an active heterotrophic biomass inflow. The evaluation focused on the possibility of sludge minimization. Thus, related process stoichiometry was derived on the basis of mass balance for essential parameters. Stoichiometric relationships showed that the reactor ho...

The process performance of a MBR operated on municipal sewage at elevated temperatures was evaluated by dynamic modeling. The enhanced biological phosphorus removal (EBPR) performance varied from 40% to 95% with process temperature ranging from 24 to 38 °C. The respective maximum substrate uptake rate (qPHA) was estimated at 1.5 gCODS/gCODX.day⁻¹ f...

The objective of this study is to evaluate the effect of wastewater reuse on product quality for an oven manufacturing plant. The industry has two production lines composed of paint and enamel coating. Paint line is further divided into white-black, anti-finger and silver lines. A total of 1670 m 3 per week of wastewater is generated from paint lin...

A lab-scale Sequencing Batch Reactor (SBR) was implemented to investigate biological treatability and kinetic characteristics of paint shop wastewater (PSW) together with main stream wastewater (MSW) of a bus production factory. Readily biodegradable and slowly biodegradable COD fractions of MWS were determined by respirometric analysis: 4.2% (SS),...

Operating a wastewater treatment plant (WWTP) efficiently is a knowledge required key issue than the entity of treatment plant. In this study, efficiency of WWTP of a metal finishing industry was evaluated and optimized after the process renovation by means of a modern eco-friendly process application. Three processes intensively consuming water an...

The study tested the performance of super fast membrane bioreactor (SFMBR) using starch as a slowly biodegradable substrate, exploring the fate of starch, and the response of the microbial community. SFMBR was operated at extremely low sludge ages of 0.5–2.0 days, with a hydraulic retention time of 1.0 h. Average values for permeate chemical oxygen...

Municipal sludge has energy content in the range of (9,000-23,000 kJ/kg) depending upon the organic content. This entrapped energy can be transformed into heat and electrical energies by different technologies combining biological and thermal processes. Recently, the combination of advanced digestion and incineration or gasification was found to be...

The study provided a critical appraisal of the extended aeration process as a single-sludge system for nitrogen removal, emphasizing its inherent deficiencies. For this purpose, the system was designed first using the prescribed procedure in the German practice, ATV A-131. The design used the basic data reported in different studies related to conv...

The study involved experimental observation and performance evaluation of a membrane bioreactor system treating municipal wastewater for nutrient removal for a period 500 days, emphasizing the impact of high temperature on enhanced biological phosphorus removal (EBPR). The MBR system was operated at relatively high temperatures (24-41 °C). During t...

In this study, the enhanced biological phosphorus removal (EBPR) of industrial wastewater was investigated using lab scale SBR and full scale modeling studies. The operation of SBR system under different chemical oxygen demand (COD)/phosphorus(P) ratios (COD/P: 65-120) indicated that nearly 80% of phosphorus removal was possible via implementing an...

This study evaluated the scientific and technical basis of the dissolved organic carbon (DOC) limitation imposed on municipal sludge for landfilling, mainly for assessing the attainability of the implemented numerical level. For this purpose, related conceptual framework was analyzed, covering related sewage characteristics, soluble microbial produ...

The nutrient removal performance of a membrane bioreactor (MBR) plant treating the wastewater of 10,000 PE was investigated with dynamic simulations. The average process performance with respect to chemical oxygen demand and total nitrogen were reported to be 97 and 81 %, respectively. The modeling study showed that low dissolved oxygen (DO) levels...

Nitrogen monoxide (NO) and nitrogen dioxide referred as NOx are one of the most important air pollutants in the atmosphere. Biological NOx removal technologies have been developing to reach a cost-effective control method for upcoming stringent NOx emission standards. The BioDeNOx system was seen as a promising biological NOx control technology whi...

The study investigated the effect of intermittent aeration on the nitrogen removal performance of a membrane bioreactor (MBR) treating black water. A pilot-scale MBR with an effective volume of 630 L operating as a sequencing batch reactor (SBR) with intermittent aeration was used in the experiments. Substrate feeding was limited to the initial non...

Istanbul is a megacity with a population of over 13 million. Due to experienced droughts and population growth in the city, interbasin water transfer from Melen Watershed was considered as the most feasible alternative to supply water that can compensate for water demand in the future. This decision changed the beneficial use of the Melen Watershed...

ABSTRACT: Appropriate management of wastewater and sludge requires several systems. One of these systems is the collection of data about generation rates and characteristics of sludge. This paper aims to summarize the work done as a part of a threeyear project requested by the Turkish Ministry of Environment and Urbanization. Efforts involved prepa...

The study involved model evaluation of the fate and utilization of starch by microbial culture acclimated to different growth conditions and feeding regimes. For this purpose, parallel sequencing batch reactors were operated with pulse and continuous feeding of soluble starch at sludge ages of 8 and 2days. High-rate adsorption was identified as the...

The design and operational parameters of an activated sludge system were analyzed treating the municipal wastewaters in Istanbul. The design methods of ATV131, Metcalf & Eddy together with model simulations were compared with actual plant operational data. The activated sludge model parameters were determined using 3-month dynamic data for the biol...

The heterotrophic biomass has the capacity of utilizing substrate predominantly for growth or storage processes under steady-state conditions. In this study, the short-term variations in growth and storage kinetics of activated sludge under disturbed feeding conditions were analyzed using a multi-component biodegradation model. The variations in gr...

This study investigated the acute effect of benzo[a]anthracene, a significant compound among polycyclic aromatic hydrocarbons, on the biodegradation of a synthetic organic substrate-a peptone/meat extract mixture-under aerobic conditions. A laboratory-scale sequencing batch reactor was sustained at steady state at a sludge age of 10 days with subst...

This study investigates the pilot scale MBR performance for total nitrogen removal under aerobic mesophilic (36°C) conditions. The calculated stoichiometry for denitrification was compared to the overall nitrogen process performance data. Much higher denitrification performance was experimented compared to the stoichiometric calculation between COD...

This study is focused on the physical filtration characteristics of a flatsheet membrane bioreactor (MBR) operated under a novel filtration mode. The objective of this research was to demonstrate the possibility of running a membrane bioreactor with high MLSS concentration for prolonged periods without frequent blocking of the membranes. Current MB...

The study investigated the effect of feeding regime and sludge age on acetate utilization. Parallel sequencing batch reactors (SBRs) were operated at steady-state with pulse and continuous feeding of acetate at sludge ages of 8 and 2 days. Acetate was always partially converted to poly-β-hydroxybutyrate (PHB). The adopted model remained equally app...

This study investigated the effect of stream segregation on the biodegradation characteristics of wastewaters generated by fur-suede processing. It was conducted on a plant located in an organized industrial district in Turkey. A detailed in-plant analysis of the process profile and the resulting pollution profile in terms of significant parameters...

Effect of low dissolved oxygen on simultaneous nitrification and denitrification was evaluated in a membrane bioreactor treating black water. A fully aerobic membrane bioreactor was operated at a sludge age of 60 days under three low dissolved oxygen (DO) levels below 0.5mg/L. It sustained effective simultaneous nitrification/denitrification for th...

The study investigated the stability of the simultaneous nitrification and denitrification process in membrane bioreactors with specific emphasis on mass transfer limitations for oxygen diffusion. It mainly focused on the effect of biomass (MLSS) concentration on the relative magnitude of mass transfer coefficients. For this purpose, a functional r...

This study deals with respirometric modeling of biodegradation of complex organic matter generated from a chemical industry. Evaluation with a multi-degradation model indicated that organic matter in raw wastewater has four types of biodegradable components having different biodegradation characteristics. The model evaluation of batch respirogram i...

This paper evaluated the effect of sludge history on the efficiency of aerobic sludge stabilization. The fate of excess sludge in activated sludge systems is closely related to the nature of biomass sustained in the system. The composition of biomass greatly affects stabilization performance. In this study, the impact of sludge history was investig...

This study is focused on the physical filtration characteristics of a flatsheet membrane bioreactor (MBR) operated under a novel filtration mode. The objective of this research was to demonstrate the possibility of running an MBR with high MLSS concentration for prolonged periods without frequent blocking of the membranes. Current MBR designs, most...

Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Feder...

The paper provided a comprehensive evaluation of the mechanism and design of intermittent aeration activated sludge process for nitrogen removal. Based on the specific character of the process the total cycle time, (T(C)), the aerated fraction, (AF), and the cycle time ratio, (CTR) were defined as major design parameters, aside from the sludge age...

BACKGROUND: Household wastewater was segregated to grey and black water components as part of a recent approach aiming to separate wastewater fractions for more efficient treatment and reuse. Chemical oxygen demand (COD) fractionation and biodegradation characteristics of black and grey water were determined by means of model calibration of the oxy...

This study was focused on evaluating the role and the effect of anoxic decay on the extent of simultaneous nitrification-denitrification (SNdN) process sustained in a single membrane bioreactor. The membrane bioreactor was fed with relatively strong domestic sewage and operated at steady state at a sludge age of 36 days at a corresponding suspended...

This study evaluates the biodegradation kinetics of an integrated dairy wastewater, with the main purpose of defining the experimental basis for modelling of the activated sludge process. Besides conventional characterization, the experiments involved detailed chemical oxygen demand (COD) fractionation and assessment of major kinetic and stoichiome...

In this study, the ammonia removal efficiency for high ammonia-containing wastewaters was evaluated via partial nitrification. A nitrifier biocommunity was first enriched in a fill-and-draw batch reactor with a specific ammonium oxidation rate of 0.1 mg NH(4) (-)-N/mg VSS.h. Partial nitrification was established in a chemostat at a hydraulic retent...

The effect of settling on mass balance and biodegradation characteristics of domestic wastewater and on denitrification potential was studied primarily using model calibration and evaluation of oxygen uptake rate profiles. Raw domestic wastewater was settled for a period of 30 minutes and a period of 2 hours to assess the effect of primary settling...

The study investigated the effect of biomass concentration on nitrogen removal in a membrane bioreactor by model evaluation of system performance. The steady state operation of a pilot membrane bioreactor fed with domestic sewage at a sludge age of 74 days and an average biomass concentration of 27,000 mg/L was monitored. The results were evaluated...

This study was conducted to evaluate and optimize a simultaneous nitrification/denitrification process in a membrane bioreactor operated with no separate anoxic volume. The membrane bioreactor was fed with strong domestic sewage and operated at steady state at a sludge age of 36 days and a corresponding suspended solid levels in the range of 17,500...

This study was focused on providing a model evaluation that could be used as an effective prediction tool for nitrogen removal performance of membrane bioreactors (MBRs) with emphasis on the effect of dissolved oxygen concentration variations in the reactor. A pilot-scale MBR fed with raw domestic sewage was operated in a predenitrification mode wi...

This paper evaluates model-based upgrading of an activated sludge plant treating wastewaters of leather tanning industrial district with an average capacity of 13,000 m(3)/d. Significant impact of temperature changes on biochemical processes, such as nitrification and denitrification were quantified and used in setting the aeration control for proc...

This study is mainly focused on evaluating the impact of dissolved oxygen and anoxic decay on simultaneous nitrification and denitrification (SNdN) in a pilot scale membrane bioreactor (MBR). Nitrate utilization rates for anoxic and MBR tanks were calculated from a previously calibrated model to quantify the effect of each tank on the total nitroge...

Xenobiotic compounds are widely used in several industries; hence they frequently appear in industrial wastewaters. It is a well-known fact that even the discharge of conventionally treated wastewater may have adverse effects on the receiving water environment. Turkey, a developing EU applicant country, has many industrial sectors producing large a...

The study evaluated the biodegradation characteristics of a mixture of organics with different biodegradation characteristics in an integrated chemical plant effluent. The wastewater had a total chemical oxygen demand (COD) content of 12,800mg/L, mostly soluble and 93% biodegradable. The evaluation was based on respirometry, and mainly consisted on...

Nutrient removal capability of the MBR process has attracted more attention than organics removal in the past few years. Apart from the conventional schemes for nitrogen removal in MBR process, simultaneous nitrification-denitrification (SNDN) requires the most attention for further research. In order to fully understand the fundemantals and mechan...