Study of seashell waste recycling in fireproofing material: Technical, environmental, and economic assessment

Peceño, Begoña; Alonso-Fariñas, Bernabé; Vilches, Luís F.; Leiva, Carlos

doi:10.1016/j.scitotenv.2021.148102

Cited by 20 publications

(17 citation statements)

References 47 publications

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“…To prepare the samples, the solid components were weighed in compositions of 40% scallop shells and 60% gypsum (40% S), 50% scallop shells and 50% gypsum (50% S), and the control sample, 100% gypsum (0% S). The technical feasibility of using shells in these compositions for this application was shown in [46]. All solids were mixed into a homogeneous mixture using a mixer, and water was added at a water/solid ratio equal to 0.5.…”

Section: S (%)mentioning

confidence: 99%

“…The use of aquaculture wastes as inputs for materials from other industries is a productive strategy that has been developed in recent decades [46][47][48][49][50]. Initially recognized as recycling strategies and studied through economic or life cycle cost (LCC) analysis, they are nowadays associated with circular economy strategies and studied using life cycle assessment (LCA).…”

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confidence: 99%

“…Looking at the performance of the aquaculture and construction industries in Chile allows us to identify linear economic models, where scallop shell waste is discarded without use [46,59] and more than 70% of raw materials for construction materials come from virgin natural resources [60]. Figure 1 shows both the amount of calcium carbonate and gypsum extracted to supply the resource demand for the production of construction materials, and the amount of scallop landings (i.e., muscle and shells).…”

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confidence: 99%

“…The performance of scallop shells as an ingredient in the fabrication of building materials has been addressed in the literature, which nonetheless indicates challenges such as the economic evaluation of substitution [38] and comparison with the production cost of conventional materials [11]. The recycling of mollusk shells into fireproof materials has been evaluated in this context [46]. However, the durability of building materials using scallop shell waste has not been evaluated for these applications.…”

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confidence: 99%

“…(2) The economic performance of the experience was measured to evaluate the circular economy potential between the two industries. The recycling of mollusk shells into fireproof materials has been evaluated in this context [46]. However, the durability of building materials using scallop shell waste has not been evaluated for these applications.…”

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Assessing Durability Properties and Economic Potential of Shellfish Aquaculture Waste in the Construction Industry: A Circular Economy Perspective

et al. 2022

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The construction industry’s high demand for natural resources, combined with the waste generated by agriculture, creates an opportunity for the circular economy. This experiment used the CaCO3 found in scallop shells as an ingredient for the manufacture of fire-resistant materials, replacing gypsum in compositions of 40% and 50% by weight. The mechanical compressive strength was estimated for both freeze-thaw cycles and acid and sulfate attacks. The cost of disposing of scallop shell waste in landfills, savings from substitution, and the payback period relative to the amount of production were determined. The compressive strength of the materials decreased by 80% when subjected to freeze-thaw cycles and sulfate attack. In response to acid attack, they showed a 100% increase in strength during the first three weeks and a decrease thereafter. The savings amounted to $46.36 (22.4%) for 40% replacement and $58.93 (28.4%) for 50%. Respectively, return on investment is achieved at 800- and 630-per-metric ton produced. The difference between the costs of waste disposal (in aquaculture) and the potential savings from using CaCO3 as a raw material (in construction) creates an opportunity for commercialization between the two industries, serves as a reference for decision-makers, and complies with circular economy principles, reducing both inputs of raw materials and outputs of waste.

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Section: S (%)mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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