Kensuke Fukushi

Bio: Kensuke Fukushi is an academic researcher from University of Tokyo. The author has contributed to research in topics: Membrane bioreactor & Sustainability. The author has an hindex of 34, co-authored 144 publications receiving 3604 citations. Previous affiliations of Kensuke Fukushi include United Nations University & University of Wollongong.

Hybrid Treatment Systems for Dye Wastewater

Abstract: Virtually all the known physicochemical and biological techniques have been explored for treatment of extremely recalcitrant dye wastewater; none, however, has emerged as a panacea. A single universally applicable end-of-pipe solution appears to be unrealistic, and combination of appropriate techniques is deemed imperative to devise technically and economically feasible options. An in-depth evaluation of wide range of potential hybrid technologies delineated in literature along with plausible analyses of available cost information has been furnished. In addition to underscoring the indispensability of hybrid technologies, this article also endorses the inclusion of energy and water reuse plan within the treatment scheme, and accordingly proposes a conceptual hybrid dye wastewater treatment system.

Hybrid treatment systems for dye wastewater

Abstract: Virtually all the known physicochemical and biological techniques have been explored for treatment of extremely recalcitrant dye wastewater; none, however, has emerged as a panacea. A single universally applicable end-of-pipe solution appears to be unrealistic, and combination of appropriate techniques is deemed imperative to devise technically and economically feasible options. An in-depth evaluation of wide range of potential hybrid technologies delineated in literature along with plausible analyses of available cost information has been furnished. In addition to underscoring the indispensability of hybrid technologies, this article also endorses the inclusion of energy and water reuse plan within the treatment scheme, and accordingly proposes a conceptual hybrid dye wastewater treatment system.

Denitrification with methane as external carbon source.

Abstract: Methane is a potentially inexpensive, widely available electron donor for biological denitrification of wastewater, landfill leachate or drinking water. Although no known methanotroph is able to denitrify, various consortia of microorganisms using methane as the sole carbon source carry out denitrification both aerobically and anaerobically. Aerobic methane-oxidation coupled to denitrification (AME-D) is accomplished by aerobic methanotrophs oxidizing methane and releasing soluble organics that are used by coexisting denitrifiers as electron donors for denitrification. This process has been observed in several laboratory studies. Anaerobic methane oxidation coupled to denitrification (ANME-D) was recently discovered and was found to be mediated by an association of an archaeon and bacteria. Methane oxidizing consortia of microorganisms have also been studied for simultaneous nitrification and denitrification (SND) of wastewater. This review focuses on the AME-D process, but also encompasses methane oxidation coupled to SND as well as ANME-D.

Sustainability science: bridging the gap between science and society

Abstract: These challenges are nolonger ignorable, as they have triggered fierce debates andcontroversies across all sectors and classes of society,finally infiltrating the ivory towers of academia. Yet, publicattention is captivated by the entertaining media episodeson these catastrophes and hardly any attention is paid to thecatastrophes’ underlying structures and root causes. Recentexamples include Fukushima’s nuclear power plant fiascoand the BP oil spill in the Gulf of Mexico that divertattention from the key drivers, namely, the insatiableenergy consumption in industrialized nations; the eco-nomic ideologies of safety and security that justify militaryinterventions and arms trade, which continue to increaseand spread in spite of humanitarian rhetoric and globalrecession; the continuous urbanization, with the majority ofthe world’s population now living in urban areas, thereby,perpetuating the discredits and exploits of rural areas; thesilent discounting of our children’s future through indus-trial food, resulting in more than a quarter of all children inindustrialized nations being obese or overweight, with themajority staying obese as adults (Wiek et al. 2011b).While research and education slowly recognize theimportance of shifting their efforts to such challenges andtheir root causes (Jerneck et al. 2011; Spangenberg 2011;Wiek et al. 2011a), sustainability scientists lack experienceand expertiseincontributingtofeasibleandeffectivesolutionoptions. The concept of linking knowledge to action forsustainability was initiated a decade ago (Kates et al. 2001)and has been reiterated since then (Komiyama and Takeuchi2006; van Kerkhoff and Lebel 2006); yet, too many scholarsstillbelievethatthislinkwillmiraculouslyemerge.However,it is obvious that it requires a very different type of researchand education (Sarewitz et al. 2010;Wieketal.2011a):namely, research that generates knowledge that matters topeople’s decisions and engages in arenas where powerdominates knowledge; and education that enables students tobe visionary, creative, and rigorous in developing solutionsand that leaves the protected space of the classroom to con-front the dynamics and contradictions of the real world.Against this background, the community of sustain-ability scientists is confronted with two essential questions.First, what is a reasonable mission for sustainability sci-ence, considering that research and education are valuablebut not sufficient contributions to solving sustainability

Development of a submerged membrane fungi reactor for textile wastewater treatment

Abstract: A submerged microfiltration membrane bioreactor implementing the white-rot fungus Coriolus versicolor was developed for the treatment of textile dye wastewater following explorations with different fouling-prevention techniques. The optimum combination ensuring permeate quality and precluding membrane fouling comprises of placing a bundle of hollow fibers within a non-woven coarse-pore (50–200 μm) mesh cage, so as to avoid direct deposition of sludge onto it, together with arrangements for its periodic high-pressure back-washing (3 s/10 min) and chemical back-flushing (100 ml/m 2 , every third day). Under controlled temperature (29±1°C) and pH (4.5±0.2), and applied HRT and an average flux of 15 h and 0.021 m/d, respectively, the reactor accomplished around 97% TOC and 99% color removal from the synthetic wastewater (TOC = 2 g/L; dye = 100 mg/L) for a prolonged period of observation. Realization of excellent stable pollutant removal along with alleviation of the membrane-fouling problem by employing reasonable chemical-cleaning dose presents the proposed novel system as an attractive one.

Application of low-cost adsorbents for dye removal – A review

Abstract: Dyes are an important class of pollutants, and can even be identified by the human eye. Disposal of dyes in precious water resources must be avoided, however, and for that various treatment technologies are in use. Among various methods adsorption occupies a prominent place in dye removal. The growing demand for efficient and low-cost treatment methods and the importance of adsorption has given rise to low-cost alternative adsorbents (LCAs). This review highlights and provides an overview of these LCAs comprising natural, industrial as well as synthetic materials/wastes and their application for dyes removal. In addition, various other methods used for dye removal from water and wastewater are also complied in brief. From a comprehensive literature review, it was found that some LCAs, in addition to having wide availability, have fast kinetics and appreciable adsorption capacities too. Advantages and disadvantages of adsorbents, favourable conditions for particular adsorbate-adsorbent systems, and adsorption capacities of various low-cost adsorbents and commercial activated carbons as available in the literature are presented. Conclusions have been drawn from the literature reviewed, and suggestions for future research are proposed.

Fouling in membrane bioreactors used in wastewater treatment

Abstract: The membrane bioreactor (MBR) can no longer be considered as a novel process. This reliable and efficient technology has become a legitimate alternative to conventional activated sludge processes and an option of choice for many domestic and industrial applications. However, membrane fouling and its consequences in terms of plant maintenance and operating costs limit the widespread application of MBRs. To provide a better understanding of the complex fouling mechanisms and propensities occurring in MBR processes, this review compiles and analyses more than 300 publications. This paper also proposes updated definitions of key parameters such as critical and sustainable flux, along with standard methods to determine and measure the different fractions of the biomass. Although there is no clear consensus on the exact phenomena occurring on the membrane interface during activated sludge filtration, many publications indicate that the extracellular polymeric substances (EPS) play a major role during fouling formation. More precisely, the carbohydrate fraction from the soluble microbial product (also called soluble EPS or biomass supernatant) has been often cited as the main factor affecting MBR fouling, although the role of the protein compounds in the fouling formation is still to be clarified. Strategies to limit fouling include manipulating bioreactor conditions, adjusting hydrodynamics and flux and optimizing module design.

Combination of Advanced Oxidation Processes and biological treatments for wastewater decontamination—A review

Abstract: Nowadays there is a continuously increasing worldwide concern for development of alternative water reuse technologies, mainly focused on agriculture and industry. In this context, Advanced Oxidation Processes (AOPs) are considered a highly competitive water treatment technology for the removal of those organic pollutants not treatable by conventional techniques due to their high chemical stability and/or low biodegradability. Although chemical oxidation for complete mineralization is usually expensive, its combination with a biological treatment is widely reported to reduce operating costs. This paper reviews recent research combining AOPs (as a pre-treatment or post-treatment stage) and bioremediation technologies for the decontamination of a wide range of synthetic and real industrial wastewater. Special emphasis is also placed on recent studies and large-scale combination schemes developed in Mediterranean countries for non-biodegradable wastewater treatment and reuse. The main conclusions arrived at from the overall assessment of the literature are that more work needs to be done on degradation kinetics and reactor modeling of the combined process, and also dynamics of the initial attack on primary contaminants and intermediate species generation. Furthermore, better economic models must be developed to estimate how the cost of this combined process varies with specific industrial wastewater characteristics, the overall decontamination efficiency and the relative cost of the AOP versus biological treatment.

Remote Sensing And Image Interpretation

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Recent advances in membrane bioreactors (MBRs): membrane fouling and membrane material.

Abstract: Membrane bioreactors (MBRs) have been actively employed for municipal and industrial wastewater treatments. So far, membrane fouling and the high cost of membranes are main obstacles for wider application of MBRs. Over the past few years, considerable investigations have been performed to understand MBR fouling in detail and to develop high-flux or low-cost membranes. This review attempted to address the recent and current developments in MBRs on the basis of reported literature in order to provide more detailed information about MBRs. In this paper, the fouling behaviour, fouling factors and fouling control strategies were discussed. Recent developments in membrane materials including low-cost filters, membrane modification and dynamic membranes were also reviewed. Lastly, the future trends in membrane fouling research and membrane material development in the coming years were addressed.