Using oyster-shell foamed bricks to neutralize the acidity of recycled rainwater

Chiou, Ing–Jia; Chen, C.H.; Li, Y.H.

doi:10.1016/j.conbuildmat.2014.04.101

Cited by 42 publications

(22 citation statements)

References 18 publications

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“…Oyster shell waste has been investigated as an alternative material for construction-related applications, such as a substitute for aggregates in building materials or cement clinker [6,13,[48][49][50][51]. Some authors studied the replacement of aggregates in the cement manufacture by grinding down the oyster shells and mixing with sand.…”

Section: Building Materialsmentioning

confidence: 99%

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The Potential Use of Oyster Shell Waste in New Value-Added By-Product

et al. 2019

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Calcium carbonate is one of the most used raw materials in various industries, such as construction materials, food supplement, pharmaceutics, animal feed, plastic production, and others. Calcium carbonate can derive from marine wastes, like crustaceans and bivalve’s shells. The worldwide demand for new sources of food has increased exponentially, and following that tendency, the mariculture—especially the oyster culture—has been increasingly resorting to farming techniques. In 2016, 438 billion tons of oysters were produced. The majority of the shells were unduly discarded, presenting a public health problem. This article offers a solution based on the reuse and recycling of oyster shell residues in the production region of Florianópolis, SC, Brazil. The presented solution is an oyster shell by-product developed by a local company which produces artificial stone. The main component of the artificial stone is a composite material made of oyster shells incorporated in a polymeric resin. The mechanical properties, such as its flexural strength, hardness, Weibull modulus, and fracture analysis, were held in the artificial stone. The mechanical results of the new artificial stone were compared with other natural stones, such as granite and marble, and other commercial artificial stones. This material owns suitable mechanical properties for table tops and workbenches. Using this product as an artificial stone represents an innovation in the development of a new product and adds commercial value to local waste. This product is an excellent example of a circular economy for local producers who care about the environment, and it encourages the reduction of extraction of natural stone, such as granite and marble.

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Section: Building Materialsmentioning

confidence: 99%

“…The calcium carbonate in calcined oyster shells mostly transforms into calcium oxide, which can be used as an anti-acid agent. Based on that, the oyster shells were calcined, hydrated, and foamed by adding cement and a foaming agent to produce the oyster-shell foamed bricks [48].…”

Section: Building Materialsmentioning

confidence: 99%

The Potential Use of Oyster Shell Waste in New Value-Added By-Product

et al. 2019

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“…This is supported by the results of Sophia & Sakthieswaran (2019) where a significant porosity reduction was recorded due to the addition of fine shell powder which modified the porous network of plaster by filling the inter-crystalline and interlaminate pores. Another research on the ability of seashells brick to neutralize acidity in water tanks confirmed the porosity improvement even though the material has been immersed in an acid environment for some time (Chiou et al 2014).…”

Section: Compressive Strengthmentioning

confidence: 86%

The Effects of Using Ground Cockle Seashells as an Additive for Mortar in Peat Environment

Olivia

Rahmayani

Wibisono

et al. 2020

Journal of the Civil Engineering Forum

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Seashells are available abundantly in coastal areas and have the potential to be used as aggregates and replacement for cement in mortar and concrete. They are also applied as mineral additives for mortar or concrete to increase the resistance of these materials in an aggressive environment, especially in constructing structures such as drainage and sewer networks which require good resistance to organic acid attack. This paper discusses the potential addition of ground seashells to improve the performance of mortar used as a drainage lining in an acidic environment such as peatland. The mix was designed using a 4% ground cockle shell (Anadara granosa) by cement weight as an additive in two mixes which include Ordinary Portland Cement (OPC) and OPC Cockle Shell (OPCCS). The samples were cured in a water pond for 28 days before they were placed in water and peat water for 120 days after which the compressive strength, porosity, sorptivity, change in weight, and visual characteristics were investigated. The results showed the compressive strength of OPCCS mortar increased by 11.29% after immersion in peat water for 120 days with its porosity and sorptivity decreased by 5.78% and 31.07% due to the refinement of the pores and capillary network in the mortar. Moreover, the weight of the brushed and unbrushed OPCCS mortar in peat water was lesser compared to the OPC due to the increase in CaO content which has the ability to fill the pores and reduce disintegration. The visual examination showed an improvement in the pH of OPCCS mortar due to the ability of the ground cockle shells to neutralize the acidity of the peat water. This study, therefore, shows the use of ground cockle shells as an additive makes it possible to use mortar as a drainage lining because the shells provide excellent resistance to acidic peat environments.

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“…; Chiou et al . ). However, as stated above, high‐energy conversion of shells is not deemed a sustainable or scalable solution to the issue of large‐scale shell waste at present.…”

Section: Biofilter Mediummentioning

confidence: 97%

“…However, a large proportion of that research does not use shells directly, but pretreats them via calcination or pyrolisation, forming CaO. This adjusted product is then found to be a good filter medium (Kwon et al 2004;Ma & Teng 2010;Castilho et al 2013;Chiou et al 2014). However, as stated above, high-energy conversion of shells is not deemed a sustainable or scalable solution to the issue of large-scale shell waste at present.…”

Section: Biofilter Mediummentioning

confidence: 99%

Shells from aquaculture: a valuable biomaterial, not a nuisance waste product

Morris

Backeljau

Chapelle³

2018

Reviews in Aquaculture

134

108

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Mollusc aquaculture is advocated as a highly sustainable food source and may play an important role in future food security globally. With production increasing worldwide, it is timely to appraise all aspects of aquaculture when considering its expanding role as a food source. In this regard, one regularly overlooked aspect of mollusc aquaculture is waste generation: namely the production of calcareous shells. Shells from the aquaculture industry are widely regarded as a nuisance waste product, yet at the same time, calcium carbonate is mined in the form of limestone and viewed as a valuable commodity. In a time of increased awareness of the need for a circular economy, the aquaculture and seafood industry should consider shells as a valuable biomaterial that can be reused for both environmental and economic benefit. This review discusses the current waste shell issue and identifies large‐scale shell applications that are already in place. Further, it highlights proposed applications that have the potential to be scaled up to address the problem of waste shell accumulations and reduce our reliance on environmentally damaging incineration and landfill disposal. Of the plethora of shell valorisation techniques proposed in the scientific literature, this review will focus only on those that can incorporate large‐scale shell utilisation, and do not require high‐energy processing, and are thus; simple, sustainable and potentially economically viable. Further, this review questions whether, in many cases, shells can provide more inherent value being returned to the marine environment rather than being used in land‐based applications.

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Using oyster-shell foamed bricks to neutralize the acidity of recycled rainwater

Cited by 42 publications

References 18 publications

The Potential Use of Oyster Shell Waste in New Value-Added By-Product

The Potential Use of Oyster Shell Waste in New Value-Added By-Product

The Effects of Using Ground Cockle Seashells as an Additive for Mortar in Peat Environment

Shells from aquaculture: a valuable biomaterial, not a nuisance waste product

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