[OANNES Foro] APROVECHAMIENTO DE VALVAS DE CONCHAS DE ABANICO. Algunas ideas

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 <http://www.scirp.org/Journal/Home.aspx?JournalID=192> NR
<http://www.scirp.org/Journal/Home.aspx?IssueID=1810#20232> Vol.3 No.2, June
2012 PP. 71-74  

DOI:  <http://dx.doi.org/10.4236/nr.2012.32011> 10.4236/nr.2012.32011     

http://www.scirp.org/Journal/PaperInformation.aspx?PaperID=20232

 

Preparation of Calcium Phosphate with Oyster Shells

 
<http://www.scirp.org/Journal/AuthorInformation.aspx?AuthorID=62783&searchCo
de=Hiroaki++Onoda&searchField=authors&page=1> Hiroaki Onoda,
<http://www.scirp.org/Journal/AuthorInformation.aspx?AuthorID=62784&searchCo
de=Hironari++Nakanishi&searchField=authors&page=1> Hironari Nakanishi

 
<http://www.scirp.org/Journal/articles.aspx?searchCode=Department+of+Informa
tics+and+Environmental+Sciences%2c+Kyoto+Prefectural+University%2c+Kyoto%2c+
Japan&searchField=affs&page=1> Department of Informatics and Environmental
Sciences, Kyoto Prefectural University, Kyoto, Japan. 

 

ABSTRACT

Oyster shells have received attention for use as a calcium resource. For
this study, calcium phosphate was prepared from phosphoric acid and oyster
shells. The influences of the concentration of phosphoric acid and pH in the
preparation conditions were studied from the yields of calcium phosphate and
unreacted carbonate, and the Ca/P ratios in precipitates. The yield of
calcium phosphate and carbonate was low in the preparation condition with
0.1 mol/l of phosphoric acid. The obtained precipitates were the mixture of
calcium hydrogen phosphate dihydrate and the unreacted calcium carbonate.
The reactivity of the oyster shells with phosphoric acid was discussed from
the yields and Ca/P ratios in precipitates.

 

////////////////////////////////

 

 <http://www.sciencedirect.com/science/journal/1226086X> Journal of
Industrial and Engineering Chemistry

 <http://www.sciencedirect.com/science/journal/1226086X/15/1> Volume 15,
Issue 1, January 2009, Pages 40-44

http://www.sciencedirect.com/science/article/pii/S1226086X09000069

 


Recycling wasted scallop shell as an adsorbent for the removal of phosphate


ˇ
<http://www.sciencedirect.com/science/article/pii/S1226086X09000069> Sung Ho
Yeom, ,
<http://www.sciencedirect.com/science/article/pii/S1226086X09000069>
Kang-Yeoun Jung

Abstract

Lots of scallop shells were discharged from local restaurants and marine
product manufacturers around the city of Gangneung and most of them are
dumped into landfill. The scallop shell was recycled as an adsorbent for the
removal of phosphate. The shell size greatly affected phosphate removal. One
gram of shell having diameter of around 45 μm removed 100 mg/L of phosphate
in 3 h while that of 3 mm hardly removed in 80 h. Phosphate removal was not
much affected by the pH in the range of 2.0-7.5 but it was scarcely removed
beyond pH 8.0. Higher temperature was preferred for phosphate removal but
the removal efficiency was almost constant over 35 °C. The maximum phosphate
removal capacity was obtained through Langmuir isotherm plotting and it was
as high as 23.0 mg-phosphate/g-shell. On the purpose of enhancing the
adsorption capacity of scallop shell, it was treated with chemical reagents
such as HCl, NaOH, NH4HCO3 and EDTA. HCl-treatment increased the adsorption
capacity of the shell having diameter of 45 μm by 39.8% than raw scallop
shell, but the treatment showed negligible effect on the shell of 1000 μm in
diameter. Packed-bed containing HCl-treated scallop shell with 500 μm in
diameter removed 20 mg/L of phosphate stably for 15 days and the removal
efficiency was over 85% throughout operation.

 



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