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Anbu Clemensis Johnson

Bio: Anbu Clemensis Johnson is an academic researcher from University of Sheffield. The author has contributed to research in topics: Chemical oxygen demand & Anaerobic digestion. The author has an hindex of 7, co-authored 8 publications receiving 336 citations. Previous affiliations of Anbu Clemensis Johnson include Eritrea Institute of Technology & Universiti Malaysia Perlis.

Papers
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Journal ArticleDOI
TL;DR: An overview on MEOR and biorefining relevant to the petroleum industry and highlights challenges that need to be overcome to become commercially successful is provided in this paper, where the emerging field of crude oil refining and associated industrial processes such as biodesulfurization, biodemetallation, biodenitrogenation and biotransformation are also covered.

183 citations

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TL;DR: In this paper, the addition of a co-substrate such as whey to the aerobic treatment pre-treatment of OMW by the yeast Candida tropicalis was studied.

68 citations

Journal ArticleDOI
TL;DR: The total mono-cyclic phenol reduction in OMW in this study was carried out by aerobic pre-treatment using the yeast Candida tropicalis in a 18 L batch reactor at 30 degrees C for 12 days followed by anaerobic co-digestion.

43 citations

Journal ArticleDOI
TL;DR: In this article, the impact of matrix cracks and debonding on the effective stress transfer efficiency (EST) and stress transfer length (STL) of E-glass fibres was investigated.
Abstract: The single fibre fragmentation test is commonly used to characterise the fibre/matrix interface. During fragmentation, the stored energy is released resulting in matrix cracking and/or fibre/matrix debonding. Axisymmetric finite element models were formulated to study the impact of matrix cracks and fibre/matrix debonding on the effective stress transfer efficiency (EST) and stress transfer length (STL). At high strains, plastic deformation in the matrix dominated the stress transfer mechanism. The combination of matrix cracking and plasticity reduced the EST and increased STL. For experimental validation, three resins were formulated and the fragmentation of an unsized and uncoupled E-glass fibre examined as a function of matrix properties. Fibre failure was always accompanied by matrix cracking and debonding. With the stiff resin, debonding, transverse matrix cracking and conical crack initiation were observed. With a lower modulus and lower yield strength resin the transverse matrix crack length decreased while that of the conical crack increased. (C) 2011 Elsevier Ltd. All rights reserved.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of a transverse matrix crack on the matrix stress transfer to an isolated alumina fiber in epoxy resin was investigated and the maximum shear stress at the fibre/matrix interface was found to be displaced away from the fibre-break.

16 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the authors highlight on the treatment approaches and valorization options for dealing with olive mill waste residues, predominantly those allowing for the recovery of valuable natural components such as phenolic compounds, dietary fibers, animal feed, biofuel, biogaz, enzymes, polymers and other.

470 citations

Journal ArticleDOI
TL;DR: The present review describes the potential applications of biosurfactants in the oil industry and the remediation of environmental pollution caused by oil spills.
Abstract: Petroleum hydrocarbons are important energy resources. However, petroleum is also a major pollutant of the environment. Contamination by oil and oil products has caused serious harm, and increasing attention has been paid to the development and implementation of innovative technologies for the removal of these contaminants. Biosurfactants have been extensively used in the remediation of water and soil, as well as in the main stages of the oil production chain, such as extraction, transportation, and storage. This diversity of applications is mainly due to advantages such as biodegradability, low toxicity and better functionality under extreme conditions in comparison to synthetic counterparts. Moreover, biosurfactants can be obtained with the use of agro-industrial waste as substrate, which helps reduce overall production costs. The present review describes the potential applications of biosurfactants in the oil industry and the remediation of environmental pollution caused by oil spills.

305 citations

Journal ArticleDOI
TL;DR: A brief summary of sources of lignin, methods of depolymerization, biological pathways for conversion of the lign in monomers and the analytical tools necessary for characterizing and evaluating key lignIn attributes are given.

285 citations

Journal ArticleDOI
TL;DR: Biosurfactants are going to have a significant role in many future applications in the oil industries and in this review, recent important relevant applications, patents disclosures and potential future applications for biosurfactant in petroleum and related industries are highlighted.
Abstract: The growing global demand for sustainable technologies that improves the efficiency of petrochemical processes in the oil industry has driven advances in petroleum biotechnology in recent years Petroleum industry uses substantial amounts of petrochemical-based synthetic surfactants in its activities as mobilizing agents to increase the availability or recovery of hydrocarbons as well as many other applications related to extraction, treatment, cleaning and transportation However, biosurfactants have several potential applications for use across the oil processing chain and in the formulations of petrochemical products such as emulsifying/demulsifying agents, anticorrosive, biocides for sulphate-reducing bacteria, fuel formulation, extraction of bitumen from tar sands and many other innovative applications Due to their versatility and proven efficiency, biosurfactants are often presented as valuable versatile tools that can transform and modernise petroleum biotechnology in an attempt to provide a true picture of state of the art and directions or use in the oil industry We believe that biosurfactants are going to have a significant role in many future applications in the oil industries and in this review therefore, we highlight recent important relevant applications, patents disclosures and potential future applications for biosurfactants in petroleum and related industries

239 citations

Journal ArticleDOI
TL;DR: In this article, a review of the current status and recent developments in the recovery and removal of phenolic compounds from OMW have been critically examined, including physical and biological methods.
Abstract: Food wastes are today considered as a cheap source of valuable components since the existent technologies allow the recovery of target compounds and their recycling inside the food chain as functional additives in different products. Olive mill wastewater (OMW) is generated from olive oil extraction systems. It has high added-value compounds namely phenolics, recalcitrants, pectin, and some important enzymes. It causes a certain amount of toxicity/phytotoxicity because of its phenolic compounds. OMW also has significant impacts when discharged directly into surface waters. Therefore, the treatment of olive mill wastewater is very much needed. Several types of techniques have been investigated for OMW treatment along with recovery and removal of its phenolic compounds. Among these techniques, physical ones are utilized for extraction purposes, while chemical and biological methods are applied in order to diminish organic load. In this review, current status and recent developments in the recovery and removal of phenolic compounds from OMW have been critically examined.

234 citations