Recycling of shell wastes into nanosized calcium carbonate powders with different phase compositions

Lu, Jinshan; Lu, Zhangyang; Li, Xibao; Xu, Huiyan; Li, Xiaoyong

doi:10.1016/j.jclepro.2014.12.093

Cited by 55 publications

(27 citation statements)

References 41 publications

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“…Generally, shell powder has aragonite shape, however the addition of alcaline solution (e.g. NaOH, NaClO, KOH, and LiOH) enable transform the aragonite to calcite shape which implies mineralization process in sub-micron particle size [30]. In addition, the calcite form is generally found in nature and more stable at ambient temperature and atmosphere [28].…”

Section: Physical Characteristicsmentioning

confidence: 99%

The Utilization of Catfish Bone Waste as Microcalcium by Different Preparation Methods

2020

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In order to improve the quality of catfish bone flour, the sol-gel method was used to extract calcium. The purpose of the research was to compare calcium characterization, specifically chemical and physical quality based on discrepancy extraction methods. Completely Random Design was used as a factor with different calcium extraction, which were sol-gel method with agitation, a sol-gel treatment without agitation and the conventional way. Each treatment replicated in three folds. The results showed that the sol-gel process with agitation increased catfish bone flour quality (p<0.05), namely calcium (16.02%) and phosphor (5.13). Compared to the conventional method, the sol-gel way with and without agitation reduced particle size from from micro to sub-micro size by 174.67 µm to 3.82 and 5.12 µm respectively. The highest whiteness index (84.18) made micro calcium prepared by sol-gel method with agitation process as prospective for food fortification. Based on microscopic observation, catfish bone flour has calcite shape and stable structure which prospective used to substitute calcium loss in the bone.

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Section: Physical Characteristicsmentioning

confidence: 99%

The Utilization of Catfish Bone Waste as Microcalcium by Different Preparation Methods

2020

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“…As evidenced by the authors, marine mollusks are abundant and easy-to-process substrates used worldwide by humans since the mid-Holocene period (see [78] and references within). As described in [79], millions of tons of shell waste are annually generated as byproducts by the Chinese shellfish industry. From the economic and sustainable viewpoint, it is desirable to convert these residues into usable products for industrial applications.…”

Section: Chitin: a European Opportunitymentioning

confidence: 99%

“…From the economic and sustainable viewpoint, it is desirable to convert these residues into usable products for industrial applications. Nowadays, several studies are involved in their re-use, mainly in wastewater and soil treatments [75,79].…”

Section: Chitin: a European Opportunitymentioning

confidence: 99%

Aquatic-Derived Biomaterials for a Sustainable Future: A European Opportunity

Nisticò

2017

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Abstract:The valorization of aquatic-derived biowastes as possible feedstock for the production of value-added chemicals and materials is proposed here as a sustainable alternative compared to the exploitation of the more conventional (fossil) resources. In this context, the comprehension of the opportunity related to the valorization of the shellfish industry biowaste for the production of useful materials, especially focusing on chitin and its derived byproducts, is investigated. The large amount of waste produced each year by the shellfish processing industry seems to be an appealing opportunity for the European market to produce valuable products from underutilized waste. In order to highlight this important market-opportunity, the actual European situation concerning the shellfish volume of production is presented. The industrial processes necessary for the recovery of chitin, chitosan, and their derivatives are largely described, together with a wide description of their peculiar (and interesting) physicochemical properties. Even if nowadays the scientific literature suggests that this class of biopolymers is very appealing, further research is still necessary for overcoming some criticisms still present in the extraction and valorization of such substrates. However, the principles of both circular economy and green chemistry encourage the reduction of such biowastes and their exploitation as an alternative resource for a global sustainable future.

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“…On the other hand, the aquaculture industry produces between 6,000,000 and 8,000,000 tons of waste worldwide annually and only 25% is recycled [21], and the rest is usually dumped in coastal waters or landfills [22]. Part of the seashell waste generated by the aquaculture industry is recycled as lime substitute, wastewater decontaminant, soil conditioner, fertilizer constituent, feed additive, and liming agent [23]. However, these recycling options are not able to consume a significant amount of seashell waste produced annually [24].…”

Section: Introductionmentioning

confidence: 99%

Is Recycling Always the Best Option? Environmental Assessment of Recycling of Seashell as Aggregates in Noise Barriers

et al. 2020

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Waste recycling is an essential part of waste management. The concrete industry allows the use of large quantities of waste as a substitute for a conventional raw material without sacrificing the technical properties of the product. From a circular economy point of view, this is an excellent opportunity for waste recycling. Nevertheless, in some cases, the recycling process can be undesirable because it does not involve a net saving in resource consumption or other environmental impacts when compared to the conventional production process. In this study, the environmental performance of conventional absorption porous barriers, composed of 86 wt % of natural aggregates and 14 wt % cement, was compared with barriers composed of 80 wt % seashell waste and 20 wt % cement through an attributional cradle-to-grave life cycle assessment. The results show that, for the 11 environmental impact categories considered, the substitution of the natural aggregates with seashell waste involves higher environmental impacts, between 32% and 267%. These results are justified by the high contribution to these impacts of the seashell waste pre-treatment and the higher cement consumption. Therefore, the recycling of seashells in noise barrier manufacturing is not justified from an environmental standpoint with the current conditions. In this sense, it could be concluded that life cycle assessments should be carried out simultaneously with the technical development of the recycling process to ensure a sustainable solution.

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Recycling of shell wastes into nanosized calcium carbonate powders with different phase compositions

Cited by 55 publications

References 41 publications

The Utilization of Catfish Bone Waste as Microcalcium by Different Preparation Methods

The Utilization of Catfish Bone Waste as Microcalcium by Different Preparation Methods

Aquatic-Derived Biomaterials for a Sustainable Future: A European Opportunity

Is Recycling Always the Best Option? Environmental Assessment of Recycling of Seashell as Aggregates in Noise Barriers

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