Scalable recycling of oyster shells into high purity calcite powders by the mechanochemical and hydrothermal treatments

Lu, Jinshan; Cong, Xinquan; Li, Yingde; Hao, Yong; Wang, Chunlei

doi:10.1016/j.jclepro.2017.11.228

Cited by 48 publications

(29 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The major chemical compounds observed in each binder are listed in Table S1 . This chemical composition coincides with the findings of Shin, et al [ 41 ], Xu, et al [ 42 ] and Lu, et al [ 38 ]. Moreover, the structure of each binder (i.e., surface and porosity) was observed in macroscale via scanning electron microscopy (SEM) ( Figure 1 ).…”

Section: Methodssupporting

confidence: 92%

“…However, stabilising wide areas of polluted soil by using such cementitious materials is economically infeasible due to the cost associated with such binders. To address this issue, many researchers have investigated nature-based materials, such as chitosan [ 33 ], zeolite [ 34 ], compost [ 35 ], hydroxyapatite [ 32 ] and waste products from certain industries, including fly ash [ 29 , 36 ], oyster shell powder [ 37 , 38 ], red mud [ 39 , 40 ] and coal, for their potential use as binders. At present, these materials have gained popularity as binders because of their local availability and low cost [ 26 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…At present, these materials have gained popularity as binders because of their local availability and low cost [ 26 , 30 ]. Oyster shell have been investigated for its interactions with toxic metal ions in an aqueous medium [ 38 , 41 , 42 ]. However, only a few researchers have investigated its application to soil [ 30 , 43 , 44 , 45 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea)

Torres-Quiroz

Dissanayake

Park

2021

IJERPH

View full text Add to dashboard Cite

Low-cost absorbent materials have elicited the attention of researchers as binders for the stabilisation/solidification technique. As, there is a no comprehensive study, the authors of this paper investigated the performance of Oyster shell powder (OS), zeolite (Z), and red mud (RM) in stabilising heavy metals in three types of heavy metal-contaminated soils by using toxicity characteristic leaching procedure (TCLP). Samples were collected from surroundings of an abandoned metal mine site and from military service zone. Furthermore, a Pb-contaminated soil was artificially prepared to evaluate each binder (100× regulatory level for Pb). OS bound approximately 82% of Pb and 78% of Cu in real cases scenario. While Z was highly effective in stabilizing Pb in highly polluted artificial soil (>50% of Pb) at lower dosages than OS and RM, it was not effective in stabilising those metals in the soils obtained from the contaminated sites. RM did not perform consistently stabilising toxic metals in soils from contaminated sites, but it demonstrated a remarkable Pb-immobilisation under dosages over than 5% in the artificial soil. Further, authors observed that OS removal efficiency reached up to 94% after 10 days. The results suggest that OS is the best low-cost adsorbent material to stabilize soils contaminated with toxic metals considered in the study.

show abstract

Section: Methodssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea)

Torres-Quiroz

Dissanayake

Park

2021

IJERPH

View full text Add to dashboard Cite

show abstract

“…The seafood industry generates a vast amount of waste in the form of discarded shells such as oyster shells, much of which goes to landfill. As such, the recycling of oyster shells is an important issue because of the environmental pollution caused by odors and leachate and the damage caused to the natural landscape 36,37,38,39 . Therefore, the radiation-shielding performance was evaluated with a view to broadening the scope of shellfish recycling.…”

Section: Discussionmentioning

confidence: 99%

Development of Medical Radiation Shield Using Density-Enhanced Recycled Oyster Shells

Kim

2021

Preprint

View full text Add to dashboard Cite

As radiation-based techniques become an increasingly important tool for medical diagnostics, medical professionals face an increasing risk from the long-term effects of scattered radiation exposure. Although existing radiation-shielding products used in medicine are traditionally lead-based, recently, attention has turned to the development of more eco-friendly materials such as tungsten, bismuth, and barium sulfate. To date, however, the proposed alternative materials have struggled to compete with lead in terms of shielding performance and economic feasibility. This study explores the potential of radiation shielding materials based on the shells of bivalve mollusks such as oysters that are discarded from aquaculture, thereby preventing them from going to landfill. In addition, a firing process for enhancing the shielding performance of the original material is proposed. Experiments showed that shielding sheets comprising 0.3-mm-thick layers of oyster shell achieve a shielding efficiency of 37.32% for the low-energy X-rays typically encountered in medical institutions. In addition, the shielding performance was improved by increasing the density of the powdered oyster shell via plastic working at 1,200°C. This raises the possibility of developing multi-material radiation shields and highlights a new potential avenue for recycling aquacultural waste.

show abstract

“…Some examples are ashes, bottom ashes, and slags [17]; construction and demolition wastes [18]; and farming wastes, such as corn, wheat, bamboo, coconut shells, and olive stone [19,20]. 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].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Scalable recycling of oyster shells into high purity calcite powders by the mechanochemical and hydrothermal treatments

Cited by 48 publications

References 43 publications

Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea)

Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea)

Development of Medical Radiation Shield Using Density-Enhanced Recycled Oyster Shells

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

Contact Info

Product

Resources

About