Composite Material for Effective Cheese Whey Anaerobic Digestion

Ruģele, Kristīne; Būmanis, Ģirts; Erina, L. V.; Erdmane, Daira

doi:10.4028/www.scientific.net/kem.604.236

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The porous structure ensures wider surface, where Na + ions can diffuse. Alkali release over a longer period of time is an advantage for using material in water treatment systems [17]. The porous material structure can be obtained by mixing gas-releasing agents like aluminium paste [18].…”

Section: Introduction mentioning

confidence: 99%

The Effect of Heat Treatment on Alkali Activated Materials

Būmanis

Vītola

Fernández-Jiménez

et al. 2017

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The primary object of the present research was to investigate the porous low calcium alkali activated material (AAM). Traditionally Na+ ions for alkali activation solution ensure highly alkaline media which enhances the dissolution of amorphous phase in the raw materials forming solid cementitious material with sodium aluminosilicate hydrate (N-A-S-H) structure afterwards. Almost all alkali ions are partially hydrated filling the pores in the gel structure (N-A-S-H gel, type zeolite precursor) and neutralizing the charge on Al(OH) -4 groups. These alkali ions are available for leaching in water environment. Due to this property the application of porous AAM in this research is related to the water treatment systems similar to those of natural zeolites which are considered as effective sorbent because of their porous structure, high specific surface and ion exchange. Porous AAM was obtained from metakaolin, sodium silicate glass, modified sodium silicate solution with Ms = 1.68 and diethylene glycol (DEG) aluminium paste as pore forming agent. The density of AAM was 1150 ± 12 kg/m 3 and compressive strength fc > 12 MPa. The effect of heat treatment to microstructure and structural properties of AAM was investigated. Heat treatment is an effective method for changing the alkali leaching kinetic form AAM structure.

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Section: Introduction mentioning

confidence: 99%

The Effect of Heat Treatment on Alkali Activated Materials

Būmanis

Vītola

Fernández-Jiménez

et al. 2017

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“…The porous structure ensures a high surface area where Na + ions could diffuse. Gradual alkali release is an advantage for using material in biotechnologies [7]. The porous material structure can be obtained by mixing gasreleasing agents like aluminium paste [8].…”

Section: Introduction *mentioning

confidence: 99%

The Effect of Alkaline Material Particle Size on Adjustment Ability of Buffer Capacity

Būmanis

2015

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The pH control in biotechnological processes like anaerobic digestion is one of the key factors to ensure high efficiency in the biogas production process. The decrease of pH level in the digestion process occurs due to the rapid acid formation during metabolic processes of bacteria, which leads to the inhibition of the methane producing bacteria; therefore further digestion process is limited. The efficiency of anaerobic digestion reactor decreases dramatically if the pH level falls under pH 6.6. This problem is common for single-stage continuous digesters with a high organic solid content; therefore the active pH controlling method is commonly used. By creating inorganic alkaline material, the passive pH controlling system could be created. Soluble alkalis are enclosed in the matrix of material during the activation process thus providing slow leaching of free alkalis from the material structure in water medium and ensuring pH increase. In this research a porous alkaline composite material was developed as a pH controlling agent for the biogas production. Two mixture compositions with a different Si/Al and Si/Na ratio were created and tested. The effect of particle size of the material was investigated in order to provide different leaching rates for the described material. Granular material with particle fractions 1 -2 mm, 2 -4 mm and 4 -8 mm and a cubical specimen with dimensions 20 × 20 × 20 mm were tested. The pH level of water medium increased up to pH 11.6 during the first day and final pH value decreased to 7.8 after 20-day leaching. Alkali leaching can be increased by 19 -32 % with changing the mixture composition by adding glass powder to the alkaline material. The particle size factor had negligible effect on leaching rate of alkaline material due to the high porosity of material. Research results show that this composite material has a potential to be applied in pH control for biotechnological purposes.

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Composite Material for Effective Cheese Whey Anaerobic Digestion

Cited by 2 publications

References 6 publications

The Effect of Heat Treatment on Alkali Activated Materials

The Effect of Heat Treatment on Alkali Activated Materials

The Effect of Alkaline Material Particle Size on Adjustment Ability of Buffer Capacity

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