Study on the filtration characteristics of green liquor dregs

Golmaei, Mohammad; Kinnarinen, Teemu; Jernström, Eeva; Häkkinen, Antti

doi:10.1016/j.cej.2017.02.104

Cited by 16 publications

(3 citation statements)

References 30 publications

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“…cement), hindering the recycling of the wastes. The presence of Cd in dregs chemical compositions has been reported by other authors (Golmaei et al, 2018b;Golmaei et al, 2017). However, this hazardous heavy metal was not detected in this study, or its concentration was below the XRF detection limit.…”

Section: Raw Materials Chemical Compositionsupporting

confidence: 44%

In-depth investigation of the long-term strength and leaching behaviour of inorganic polymer mortars containing green liquor dregs

Novais

Carvalheiras

Senff

et al. 2019

Journal of Cleaner Production

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Section: Raw Materials Chemical Compositionsupporting

confidence: 44%

In-depth investigation of the long-term strength and leaching behaviour of inorganic polymer mortars containing green liquor dregs

Novais

Carvalheiras

Senff

et al. 2019

Journal of Cleaner Production

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“…The specific resistance to filtration (SRF) (m/kg) of MFT after flocculation was calculated using eq where P is the pressure (Pa), A is the filter area (m 2 ), b is the slope calculated from the plot of t / V against V , V is the volume of filtrate (m 3 ), t is the filtration time (s), μ is the viscosity of filtrate (Pa·s), and ω is the mass of solids cake formed per unit filtrate volume (kg/m 3 ). A detailed procedure to measure SRF is described elsewhere. − …”

Section: Methodsmentioning

confidence: 99%

Dewatering of Oil Sands Tailings with Novel Chitosan-Based Flocculants

et al. 2018

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Mature fine tailings need to be dewatered to reduce the environmental impact caused by oil sands extraction. Polymer flocculants are commonly used to accelerate this process. In this work, we modified chitosan, a naturally occurring biopolymer, with 3-chloro-2-hydroxypropyltrimethylammonium chloride (Chito-CTA) and also grafted polyacrylamide to chitosan (Chito-g-PAM). We compared the dewatering performance of these two flocculants with that of a commercial cationic polyacrylamide (C-PAM). Chito-CTA and Chito-g-PAM dewatered tailings at rates of 18.27 and 20.72 m/h, respectively. The dewatering ability of Chito-CTA and Chito-g-PAM, measured in terms of capillary suction time (CST), was below 10 s, whereas the value for C-PAM was 82.3 s at optimum dosage. The turbidity of the supernatant obtained after flocculation with Chito-CTA or Chito-g-PAM was below 10 NTU, while C-PAM produced turbid supernatants. We studied the effect of flocculant microstructure on the specific resistance to filtration of the sediments. Chito-g-PAM produced sediments with the lowest resistance, 2.99 × 1012 m/kg, while C-PAM’s sediments had a much higher resistance of 40.26 × 1012 m/kg. We also used the focused beam reflectance measurement technique to determine floc size evolution, floc stability, and time required to induce floc formation. Our results indicate that chitosan-based polymers may be successfully used to treat oil sands mature fine tailings.

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“…This indicates that as the amount of wood processed increases, so does the concentration of non-process elements in the GLD, but factors such as type of wood/ratio of wood types and process-specific details also have a noticeable impact. Mechanical separation methods have been shown to create physical separation of Cd, Ni, Pb, and Zn (Kinnarinen et al 2018 ; Golmaei et al 2018 ), and the rate and temperature of filtration when separating dregs from green liquor by cake filtration can affect the concentration of boron, potassium, and sodium in the filter cake (Golmaei et al 2017 ).…”

Section: Ph and Electrical Conductivitymentioning

confidence: 99%

Chemical characterization of green liquor dregs from 16 Swedish pulp and paper mills between 2017 and 2019

Stahre,

Sartz,

Bäckström

2024

Environ Sci Pollut Res

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Green liquor dregs (GLD) is an alkaline by-product from the pulp and paper industry with a pH between 10 and 14. Today most of the produced GLD in Sweden is landfilled. As a fine-grained alkaline material, it might be possible to use it for acid-generating mining waste remediation. To increase the utilization, quality characteristics and environmental performance need to be determined. In this study samples were collected 5 times from 16 mills during a period of 2.5 years, and were characterized by analyzing dry matter content, loss on ignition (LOI) 550 °C and LOI 950 °C, elemental analysis, pH, electrical conductivity, and calorific value. The results were then evaluated using multivariate statistics (PCA) as well as being compared to other studies and Swedish till. The results show that even if GLD is heterogenous (both within a mill and between different mills) trends can be seen for samples from most mills. When samples do stand out, it is predominately related to the same four mills. Most of the studied parameters showed characteristics favorable for use as a remediant; however, TOC, sulfur, and some of the elements require further study. In general, this study concludes that GLD can be a viable option for the remediation of small orphaned sulfidic mining sites and thus worthy of further studies on the interaction between GLD and acidic mining waste.Overall, GLD can be a good alternative for cost-effective remediation of smaller orphaned mining sites. It is readily available in large quantities, has the qualities needed for remediation of many orphaned acidic mining sites, and can often be locally sourced near the mining site. The use of GLD for mining site remediation is likely also a more sustainable method compared to traditional remediation methods.

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Study on the filtration characteristics of green liquor dregs

Cited by 16 publications

References 30 publications

In-depth investigation of the long-term strength and leaching behaviour of inorganic polymer mortars containing green liquor dregs

In-depth investigation of the long-term strength and leaching behaviour of inorganic polymer mortars containing green liquor dregs

Dewatering of Oil Sands Tailings with Novel Chitosan-Based Flocculants

Chemical characterization of green liquor dregs from 16 Swedish pulp and paper mills between 2017 and 2019

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