Removal of inorganic chemical species and organic matter from slaughterhouse wastewater via calcium acetate synthesized from eggshell

The physicochemical treatment (PT) of slaughterhouse wastewater (SWW) was investigated. In the first stage, calcium acetate (Ca(Ac) 2 ) was synthesized in five different ways: (1) acetic acid (HAc) and chicken eggshell (CaAc1), (2) lime (CaAc2), (3) a 1:1 eggshell and lime mixture (CaAc3), (4) a 1:2...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2019-03, Vol.54 (4), p.295-305
Main Authors: Garduño-Pineda, Laura, Linares-Hernández, Ivonne, Solache-Ríos, Marcos J., Teutli-Sequeira, Alejandra, Martínez-Miranda, Verónica
Format: Article
Language:English
Subjects:
Abattoirs
Acetic acid
Calcium
Calcium acetate
Calcium oxide
Chemical speciation
COD
Color
Copper
Egg shells
eggshell
Environmental impact
Fecal coliforms
Lime
Metals
Organic chemistry
Organic matter
pH effects
Phosphates
Physicochemical treatment
Poultry
Slaughterhouse wastewater
Solid suspensions
Sulfuric acid
Total suspended solids
Turbidity
Wastewater treatment
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Summary:The physicochemical treatment (PT) of slaughterhouse wastewater (SWW) was investigated. In the first stage, calcium acetate (Ca(Ac) 2 ) was synthesized in five different ways: (1) acetic acid (HAc) and chicken eggshell (CaAc1), (2) lime (CaAc2), (3) a 1:1 eggshell and lime mixture (CaAc3), (4) a 1:2 eggshell and lime mixture (CaAc4), and (5) calcium oxide via the calcination of eggshell (CaAc5). The synthesized Ca(Ac) 2 samples were characterized by IR, SEM, XRD, and EDS. Subsequently, the samples were used to precipitate oxyanions and organic matter. The experiments were carried out at pH 4 and 12. For the treatment with CaAc1 at pH 4, an acid (HCl, H 2 SO 4 , or HAc) was also added. The best results for CaAc1 in acid media were attained with HCl, where removal efficiencies of 82.23% total suspended solids, 76% turbidity, 81.43% color, 53.86% Fe, 69.74% Cu, and 14.64% Na were observed. This treatment also removed ∼99% fecal and total coliforms, 26.49% COD, and 78.39% TOC. The experiments were also performed at pH 12 using CaAc1. These afforded removal efficiencies of 92.7% turbidity, 84.7% color, 40.5% phosphates (PO 4 3- ), and 64.7% sulfates (SO 4 2- ). In addition, this method removed metals, 35.37% COD and 99% fecal and total coliforms.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2018.1548190