Byung Joon Lee

Byung Joon Lee
Kyungpook National University | KNU · School of Construction and Environmental Engineering

23.37
 · 
PhD

About

35
Publications
3,554
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
319
Citations

Publications

Publications (35)
Poster
Full-text available
The dynamically changing characteristics of cohesive sediment due to flocculation processes, i.e. aggregation of fine particles and breakup of aggregates that occur at microscopic scale, can affect large scale transport patterns. For gaining better insights, this study aims to incorporate the multi-class population balance equation based (MCPBE) fl...
Article
Organic matter (OM) and suspended sediment are abundant, and interact with each other, in rivers and lakes. OM is usually adsorbed by suspended sediment and causes either particle stabilization or flocculation. In this study, the OM composition and suspended sediment flocculation potential of river water were regularly measured throughout the year...
Article
The Floc Size Distribution (FSD) is crucial to predict cohesive sediment dynamics in aquatic environments. Nowadays, an increasing attention has been paid to biofilm effects on the FSDs of suspended particles, since the presence of ubiquitous biofilms on particle surfaces may lead to an increment of floc sizes and thus of settling velocities. The r...
Article
The Floc Size Distributions (FSDs) of suspended fine-grained sediment flocs play a prime role to estimate their own fate and the transport of contaminates attached to the flocs. However, developing an efficient flocculation model that is capable of simulating continuous and multimodal FSDs is still a challenge. Recently, the population balance equa...
Article
The Floc Size Distributions (FSDs) of biomineral suspended particles are of great importance to understand the dynamics of bio-mediated Suspended Particulate Matters (SPMs). Field observations were investigated at Station MOW1 in Belgian coastal waters (southern North Sea) during two typical periods with abundant and reduced biomass. In addition, t...
Article
Estuarine and coastal regions are often characterized by a high variability of suspended sediment concentrations in their waters, which influences dredging projects, contaminant transport, aquaculture and fisheries. Although various three-dimensional open source software are available to model the hydrodynamics of coastal water with a sediment modu...
Article
Full-text available
Suspended particulate matter (SPM) is abundant and essential in marine and coastal waters, and comprises a wide variety of biomineral particles, which are practically grouped into organic biomass and inorganic sediments. Such biomass and sediments interact with each other and build large biomineral aggregates via flocculation, therefore controlling...
Article
Full-text available
Municipal wastewater treatment plants (WWTPs) in Korea collect and treat not only domestic wastewater, but also discharge from industrial complexes. However, some industrial discharges contain a large amount of non-biodegradable organic matter, which cannot be treated properly in a conventional biological WWTP. This study aimed to investigate the c...
Article
Full-text available
Organic matter in the water environment can enhance either flocculation or stabilization and, thus, controls the fate and transportation of cohesive sediments and causes seasonal variation in the turbidity of river water, determining floc morphology and settling velocity. The aim of this study was to elucidate the way that biological factors change...
Article
Full-text available
The effects of polyacrylamide (PAM) molecular weights (MWs) on the PAM adsorption capacities and PAM-mediated flocculation of kaolinite suspensions were investigated using a series of nonionic PAMs with different MWs. Adsorption tests using aqueous kaolinite suspensions dosed with a series of PAMs with MWs of 1.5 kg/mol, 10 kg/mol, 0.6-1 Mg/mol, 5-...
Article
The bimodal flocculation of cohesive sediments in water environments describes the aggregation and breakage process developing a bimodal floc size distribution with dense flocculi and floppy flocs. A two class population balance equation (TCPBE) was tested for simulating the bimodal flocculation by a model-data fitting analysis with two sets of exp...
Article
Full-text available
Bimodal flocculation describes the particle/floc aggregation and breakage process in which dense microflocs and floppy macroflocs change their relative mass fraction and develop a bimodal floc size distribution (FSD). Such flocculation occurs due to the primary and secondary binding mechanisms of fine-grained cohesive sediments in a coastal zone. T...
Article
A model combining multi-dimensional discretized population balance equations with a computational fluid dynamics simulation (CFD-DPBE model) was developed and applied to simulate turbulent flocculation and sedimentation processes in sediment retention basins. Computation fluid dynamics and the discretized population balance equations were solved to...
Article
The design procedures for a biological reactor and a secondary settling tank (SST) of an activated sludge system are based on the steady state design method (Ekama et al., 1986; WRC, 1984) and the 1-D flux theory design method (Ekama et al., 1997), respectively. This study combined both of the design procedures, to determine the optimum sludge conc...
Article
Full-text available
Ordinary heterotrophic organism (OHO) active biomass plays key roles in biological wastewater treatment processes. However, due to the lack of measurement techniques, the OHO active biomass exists hypothetically within the design and simulation of biological wastewater treatment processes. This research was purposed to develop a quick and easy quan...
Article
Multimodal particle size distributions (PSDs) of fine-grained cohesive sediments are common in marine and coastal environments. The curve-fitting software in this study decomposed such multimodal PSDs into subordinate lognormal PSDs. Four modal peaks, consisting of four-level ordered structures of primary particles, flocculi, microflocs, and macrof...
Article
Full-text available
The suspended particulate matter (SPM) concentration in the high turbidity zones of the southern North Sea is inversely correlated with chlorophyll (Chl) concentration. During winter SPM concentration is high and Chl concentration low and vice versa during summer. This seasonality has often been associated with the seasonal pattern in wind forcing....
Article
Ordinary heterotrophic organisms (OHO) of an activated sludge wastewater treatment system showed an atypical growth behaviour when they are inoculated to batch aerobic growth tests with a high substrate-loaded condition. For example, the OHO maximum specific growth rates on readily biodegradable substrates (μ H) increased with a high ratio of subst...
Article
Divalent cations have been reported to develop bridges between anionic polyelectrolytes and negatively-charged colloidal particles, thereby enhancing particle flocculation. However, results from this study of kaolinite suspensions dosed with various anionic polyacrylamides (PAMs) reveal that Ca(2+) and Mg(2+) can lead to colloid stabilization under...
Article
Full-text available
Suspended particulate matter (SPM) concentration and particle size distribution (PSD) were assessed in a coastal turbidity maximum area (southern North Sea) during a composite period of 37 days in January–April 2008. PSDs were measured with a LISST 100X and classified using entropy analysis in terms of subtidal alongshore flow. The PSDs during tide...
Article
Full-text available
Particle size distributions (PSDs) of suspended particulate matters in a coastal zone are lognormal and multimodal in general. The multimodal PSD, which is caused by the mixing of multiple particle and aggregate size groups under flocculation and erosion/resuspension, is a record of the particle and aggregate dynamics in a coastal zone. Curve-fitti...
Article
Bimodal flocculation of marine and estuarine sediments describes the aggregation and breakage process in which dense microflocs and floppy macroflocs change their relative mass fraction and develop a bimodal floc size distribution. To simulate bimodal flocculation of such sediments, a Two-Class Population Balance Equation (TCPBE), which includes bo...
Article
The capabilities of three simplified analytical equations to accurately model electrostatic interactions during proton binding and release by linear anionic polyelectrolytes in aqueous solution were evaluated. The impermeable sphere (IS), Donnan (DN), and cylindrical (CY) electrostatic models were fit to experimental acid-base titration curves of l...
Article
Nonionic and anionic polyacrylamides (PAMs) are being used more extensively in soil erosion prevention and sediment control applications. Of their various physicochemical properties, the molecular weight (MW) and charge density (CD) of PAMs have been reported as being the most important characteristics for soil stabilization and sediment flocculati...
Article
Ordinary heterotrophic organism (OHO) active biomass (ZBH) is a key parameter in models for activated sludge systems, which defines quantitatively the kinetic rates of relevant processes. However, ZBH has not been measured directly with consistent success: a simple respirometric batch test has provided varying correspondence between measured and th...
Article
Full-text available
We have developed a model which combines Computational Fluid Dynamics (CFD) with multi-dimensional Discretized Population Balance Equations (DPBEs) to simulate turbulent flocculation and sedimentation processes in flocculant-aided sediment retention basins. Our CFD-DPBE model generates steady state flow field data and simulates flocculation and sed...
Article
Full-text available
Particle Size Distributions (PSDs) of suspended particulate matter are log-normal and multi-modal in general. The log-normality describes a more or less skewed distribution toward small size particles, and the multimodality describes a distribution consisting of multiple peaks. In a coastal environment suspended sediments consist often of flocs. Th...
Article
Full-text available
The biological population dynamics (e.g. algae bloom) have been concerns of biologists and ecologists, whereas the sediment dynamics have been interest of geologists and hydraulic engineers, in a marine and coastal environment. The biological and mineralogical populations seem separate in different fields of study. Recent studies however have found...
Article
Summary in English. Word processed copy. Thesis (M. Sc. (Civil Engineering))--University of Cape Town, 2002. Includes bibliographical references.

Questions and Answers

Question & Answer (1)
,

Projects

Project (1)
Project
1. Investigate flocculation kinetics, developing bimodal PSDs 2. Understand interactions between mineralogy and biochemistry 3. Develop a flocculation kinetic model for cohesive sediment transport 4. Develop a new water quality model with cohesive sediments