Biodegradation of phenolic compounds in waste foundry sand: Physical and chemical characterization of foundry sand and bacterial degradation kinetics

Spent waterglass foundry sand (SwFS) is a bulk waste of the metallurgical industry containing at least 2–5 wt% of the waterglass layer without effective utilization. To this end, this paper proposes the disposal of SwFS as fine aggregates for MgO-activated slag materials (MASMs). Two types of SwFS subjected to different treating temperatures (100°C and 800°C) were prepared to investigate their effects on fluidity, compressive strength, pore structure, and micromechanical properties of MASM. The experimental results showed that the coated waterglass of SwFS played an important role in affecting the performance of MASM mortars. For SwFS subjected to 100°C, the coated waterglass could be partially dissolved and released into the surrounding paste to activate slag along with MgO. Compared with the group without SwFS, the resulting compressive strength (MPa) of mortars with SwFS was increased by 33.6–74.1% at all ages, and the average elastic moduli (GPa) of C-A-S-H were increased by 19.6%. In contrast, for SwFS subjected to 800°C, the coated waterglass can hardly be dissolved, which induced a complex interface in the microstructure of mortars, leading to the reduced compressive strength of mortars.

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Biodegradation of phenolic compounds in waste foundry sand: Physical and chemical characterization of foundry sand and bacterial degradation kinetics

Cited by 2 publications

References 20 publications

Co-biodegradation of Phenol, o-Cresol, and p-Cresol in Binary and Ternary Mixtures: Evaluation of Bioreactor Performance and Toxicity of Treated Effluents

Co-biodegradation of Phenol, o-Cresol, and p-Cresol in Binary and Ternary Mixtures: Evaluation of Bioreactor Performance and Toxicity of Treated Effluents

Effect of spent waterglass foundry sand on the performance of MgO-activated slag materials

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