Inorganic Waste Generated in Kraft Pulp Mills: The Transition from Landfill to Industrial Applications

Quina, Margarida J.; Pinheiro, Carolina T.

doi:10.3390/app10072317

Cited by 38 publications

(35 citation statements)

References 77 publications

(126 reference statements)

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“…The irregularly shaped particles sometimes forming agglomerates founded for the studied dregs is typical of this industrial solid waste (Mymrin et al, 2016). Diffractogram peaks at 2θ angles between 25º and 30° indicates the presence of a crystalline fraction of calcite (CaCO 3 ) and other minor minerals, such as perovskite (Ca 4 Ti 4 O 12 ), dolomite (CaMg(CO 3 ) 2 ), quartz (SiO 2 ), and manganite (Mn 4 O 8 H 4 ) (Mymrin et al, 2016;JIA et al, 2019;Quina and Pinheiro, 2020). The infrared spectrum obtained for the dregs corroborates those reported previous studies, in which intense bands near 1428 cm -1 , 874 cm -1 , and 710 cm -1 indicate the presence of calcium oxides and salts, and magnesium carbonate (Almeida et al, 2007;Matias, 2012).…”

Section: Discussionmentioning

confidence: 81%

SARS-CoV-2 Removal with a Polyurethane Foam Composite

Schoeler¹,

Afonso²,

Demarco³

et al. 2021

Preprint

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The pandemic of COVID-19 (SARS-CoV-2 disease) has been causing unprecedented health and economic impacts, alerting the world to the importance of basic sanitation and existing social inequalities. The risk of the spread and appearance of new diseases highlights the need for the removal of these pathogens through efficient techniques and materials. This study aimed to develop a polyurethane (PU) biofoam filled with dregs waste (leftover from the pulp and paper industry) for removal SARS-CoV-2 from the water. The biofoam was prepared by the free expansion method with the incorporation of 5wt% of dregs as a filler. For the removal assays, the all materials and its isolated phases were incubated for 24h with an inactivated SARS-CoV-2 viral suspension. Then, the RNA was extracted and the viral load was quantified using the quantitative reverse transcription (RT-qPCR) technique. The biofoam (polyurethane/dregs) reached a great removal percentage of 91.55%, whereas the isolated dregs waste was 99.03%, commercial activated carbon was 99.64%, commercial activated carbon/polyurethane was 99.30%, and neat PU foam reached was 99.96% for this same property and without statistical difference. Those new materials endowed with low cost and high removal efficiency of SARS-CoV-2 as alternatives to conventional adsorbents.

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Section: Discussionmentioning

confidence: 81%

SARS-CoV-2 Removal with a Polyurethane Foam Composite

Schoeler¹,

Afonso²,

Demarco³

et al. 2021

Preprint

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“…Farage et al (2020) reported a pzc of 9.75 for another dregs waste. Most of the wastes leftover from pulp and paper industry have an alkaline character with pH values up to 13.0 (Quina and Pinheiro, 2020). Regarding the pzc of 8.40 obtained for the dregs, the high efficiency of this residue at pH 6 is probably related to the presence of carbonates and hydroxides, which suggests a potential for adsorption of anionic ions (Farage et al, 2020).…”

Section: Discussionmentioning

confidence: 93%

“…The peaks at 2θ angles between and 30° refer to the crystalline fraction of calcite (CaCO3). Besides of that, there were small amounts of other minerals, such as perovskite (Ca4Ti4O12), dolomite (CaMg(CO3)2), quartz (SiO2), and manganite (Mn4O8H4) (Mymrin et al, 2016;Jia et al, 2019;Wolff, 2008;Quina and Pinheiro, 2020). Nevertheless, as any industrial leftover, the particle size and composition of a dregs waste may vary depending on the applied process, environmental and, storage conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The use of pulp and paper industry wastes for acidic wastewater neutralization provides savings for mills and cost reduction in waste transportation and disposal (Pöykiö et al, 2006;Quina and Pinheiro, 2020). The retention of heavy metal contamination in soils due to the presence of carbonate and buffering capacity was also suggested (Ouhadi et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

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Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Schoeler

Afonso

Delucis

et al. 2021

Preprint

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Water bodies contaminated by heavy metals cause a series of severe environmental and health issues. Chromium compounds stand out as one of the main contaminants since they are widely used by several industries. The low efficiency of effluent treatment facilities and the expensive sanitation procedures needed to remove metals from the water lead to serious concerns about the water quality in Brazil. In this study, a rigid polyurethane foam incorporated with green liquor dregs waste was prepared by the free expansion method. The foam composite and its isolated phases were evaluated for removing Cr(III) from water. The isolated dregs removed 81.93% of the Cr(III), which yielded a removal capacity of 135.45 mg·g-1. Whereas, the foam composite displayed Cr(III) removal percentage and capacity of 36.15% and 58.50 mg·g-1, respectively. Results suggests that the hybrid material may be considered for selective removal and extraction of Cr(III) from contaminated water.

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“…Some of the studies suggest that the inorganic pulp mill residues may use as fertilizers and soil improvement chemicals in the agriculture field [12], likewise wastewater treatment and construction field [8] and also utilizing as the controlling agent for acid mine drainages [29]. Consequently, waste lime mud sample management, recycling, and a cost-effective re-utilization process are essential for development [30]. The present study mainly focuses on the sustainable use of green colored lime mud waste from the paper mill for recovering a purified lime mud by calcination and hydration processes.…”

Section: Source Of Limementioning

confidence: 99%

Sequential In-Situ Carbonation Process for the Preparation of Hand Sheets with Waste Lime Mud

et al. 2020

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In the pulp and paper industry, the white liquor obtained from the causticizing green liquor in the smelting process mostly contains NaOH and Na2S. These chemicals are returned to the digester for reuse in the pulping process. The lime mud (LM) material is obtained from the reaction of the causticization process in paper industries. It is mainly composed of CaCO3; it appears with a green color with a high moisture content; and it has a small proportion of impurities such as non-process elements, for example Fe, Na, Mg, Al, Si, P, and S oxides and other toxic metals. This lime mud has poor whiteness with less efficiency due to its contaminated with impurities. The recycling or reutilizing process for lime mud and solid wastes are minimizing its toxic effect on the environment. The present study proposed to improve the whiteness of the waste lime mud by the calcination and hydration process at high temperatures and reutilizing it for hand sheets, making the process improve the paper brightness. In this study, we used a lime mud sample for calcination at 1000 °C and 1200 °C for 2 h and hydration at different times (3–24 h) with different temperatures (30–80 °C) and measured the powder whiteness and hand sheet brightness. The results indicated that after the calcination and hydration process, the lime mud sample whiteness was improved and that re-utilization with pulp for making hand sheets also can improve the paper brightness. It can be concluded that waste lime mud sample purification and the re-utilization process are more advantageous in paper industries.

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Inorganic Waste Generated in Kraft Pulp Mills: The Transition from Landfill to Industrial Applications

Cited by 38 publications

References 77 publications

SARS-CoV-2 Removal with a Polyurethane Foam Composite

SARS-CoV-2 Removal with a Polyurethane Foam Composite

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Sequential In-Situ Carbonation Process for the Preparation of Hand Sheets with Waste Lime Mud

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