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Browsing by Author "Johakimu, Jonas K"

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Beneficiation of pulp mill waste green liquor dregs: applications in treatment of acid mine drainage as new disposal solution in South Africa

Author: Sebogodi, Keolebogile R ; Johakimu, Jonas K ; Sithole, Bishop B Date: Oct 2019 Acid mine Drainage (AMD) is a low pH, sulphate and heavy metal rich leachate that is produced from oxidation of sulphide bearing minerals commonly found in the host rocks of some mineral ores. The pH augmentation, and sulphate and metal removal ... Read more
Beneficiation of pulp mill waste green liquor dregs: Applications in treatment of acid mine drainage as new disposal solution in South Africa

Author: Sebogodi, Keolebogile R ; Johakimu, Jonas K ; Sithole, Bishop B Date: Feb 2020 Acid mine Drainage (AMD) is a low pH, sulphate and heavy metal rich leachate that is produced from oxidation of sulphide bearing minerals commonly found in the host rocks of some mineral ores. The pH augmentation, and sulphate and metal removal ... Read more
Beneficiation of sawdust waste in the context of an integrated forest bio-refinery mill: Kraft and pre-hydrolysis Kraft pulping properties

Author: Andrew, JE ; Johakimu, Jonas K ; Lekha, P ; Gibril, ME ; Sithole, Bishop B Date: 2018 As part of a broader objective to extract cellulose from sawdust waste material for the production of nano-crystalline cellulose, conventional industrially available processes such as the Kraft and pre-hydrolysis Kraft (PHK) processes were ... Read more
Bleaching of kraft pulps produced from green liquor pre-hydrolyzed South African Eucalyptus grandis wood chips

Author: Andrew, JE ; Johakimu, Jonas K ; Sithole, Bishop B Date: 2014 The effect of hemicellulose pre-extraction of South African Eucalyptus grandis wood chips using green liquor, on subsequent kraft pulping and bleaching processes was studied. This was done in the context of a biorefinery mill producing both ... Read more
Extraction of hemicellulose from South African eucalyptus grandis using weak white liquor activation technology and its impact on kraft pulping efficiency

Author: Johakimu, Jonas K ; Sithole, Bishop B Date: Sep 2017 This work summarises the findings of our research on the activation of woodchips using weak white liquor as an alternative mill self-generated alkaline solvent. The ultimate goal was to gain a better understanding on: the effectiveness of the ... Read more
Fractionation of high Kappa number kraft pulps of the South African softwoods and sulfonating of coarse fibre enriched fraction for production of sack paper

Author: Johakimu, Jonas K ; Bush, T Date: Mar 2011 The focus of this study was to seek an alternative way of manufacturing sack paper with uniform quality properties at increased refining energy efficiency compared to currently applied technologies. Kraft pulp produced at Kappa number ... Read more
Fractionation of organic substances from the South African Eucalyptus grandis biomass by a combination of hot water and mild alkaline treatments

Author: Johakimu, Jonas K ; Jerome, A ; Sithole, Bishop B ; Prabashni, L Date: Sep 2015 An alternative way of fractionating lignocellulose biomass into its individual components, hemicelluloses, lignin and cellulose, was investigated. South African Eucalyptus grandis wood chips were fractionated using a combination of hot water ... Read more
Green liquor impregnation and Kraft pulping of South African Pinus Patula – “A practical approach to provide cost savings in a Kraft mill’s pulping operation”

Author: Johakimu, Jonas K ; Bush, T ; Lucia, L Date: Feb 2011 The effect of green liquor pre-treatment (GLP) on Kraft pulping of Pinus Patula has been investigated. Wood chips were pre-treated with green liquor, and subsequently subjected to Kraft pulping to achieve a target Kappa number of 65-70. The ... Read more
Ozone bleaching of South African Eucalyptus grandis kraft pulps containing high levels of hexenuronic acids

Author: Andrew, JE ; Johakimu, Jonas K ; Ngema, NE Date: Aug 2013 Ozone use in conjunction with chlorine dioxide during pulp bleaching offers several advantages over conventional bleaching sequences that make use of chlorine dioxide only. Despite this, in South Africa, only one mill uses ozone. The current ... Read more
Preliminary study on the potential of improving pulp quality and energy efficiency in a South African TMP mill

Author: Johakimu, Jonas K ; Bush, T Date: Sep 2010 Under the current mill refining practices, the mill is introducing too much refining energy into the fibre. The lower levels of freeness for the accept samples (18 vs. 90 CSF ml required) and the higher amounts of fines confirms this (Table ... Read more
Preliminary study on the potential of improving pulp quality and energy efficiency in a South African TMP mills

Author: Johakimu, Jonas K ; Bush, T Date: Mar 2010 The main focus of this work was to evaluate an opportunity for product quality and refining energy efficiency improvement through assessing the current mill practices in South African TMP mills. The fractionation trials were conducted at a ... Read more
A review of technologies used in handling the acid mine drainage challenge: Perspectives on using green liquor dregs as a sustainable option for treatment of acid mine drainage

Author: Sebogodi, Keolebogile R ; Johakimu, Jonas K ; Sithole, Bishop B Date: Feb 2021 Acid mine drainage (AMD) is one of the repercussions that result from earth-moving activities around the sulfide-bearing mineral hosts. The detrimental effects associated with this AMD are driven by its characteristics, which include low pH ... Read more
Valorisation of mango seed via extraction of starch: preliminary techno-economic analysis

Author: Tesfaye, T ; Johakimu, Jonas K ; Chavan, RB ; Sithole, Bishop B ; Ramjugernath, D Date: Nov 2017 Reducing environmental impacts and obtaining economic benefits based on utilisation of waste materials are drivers for the implementation of cleaner production policies and technologies in food processing industries. Starch is a very versatile ... Read more

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Browsing by Author "Johakimu, Jonas K"

Browsing by Author "Johakimu, Jonas K"

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