Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)<sub>2</sub>

Adriana Reyes-Serrano; Joel E. López-Alejo; Manuel A. Hernández-Cortázar; Ignacio Elizalde

doi:10.1016/j.cjche.2019.12.023

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Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)₂

Process Systems Engineering and Process Safety | Updated：2026-01-06

- Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)₂
- Chinese Journal of Chemical Engineering Vol. 28, Issue 4, Pages: 1107-1111(2020)
- Affiliations：
  
  Instituto Politécnico Nacional, Centro Mexicano para la Producción más Limpia, Ciudad de México,Mexico,07340
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.12.023
  CLC：
- Published：2020
- Accepted：
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[J]. 中国化学工程学报, 2020, 28(4): 1107-1111.
DOI：

[J]. 中国化学工程学报, 2020, 28(4): 1107-1111. DOI： 10.1016/j.cjche.2019.12.023.

摘要

Abstract

The removal of Cr

sulfates and Chemical Oxygen Demand (COD) from industrial tannery wastewater by chemical precipitation was carried out using Calcium oxide (CaO) and Calcium hydroxide (Ca(OH)

). Different doses of alkalis

ranging from deficiency to excess hydroxyl species over the stoichiometric necessary

were used to remove theoretically the 100% of Cr [0.3-3.2 g alkali·(g Cr

)

-1

]

. The precipitation was carried out at room temperature

10 min of vigorous stirring

200 r·min

-1

and a settling time of 24 h

followed by separation and characterization of liquid product. As result of addition of alkalis

pH underwent increase as did the alkali concentration. The removal of Cr

and sulfates also increased as alkali concentration did

although for first species the changes at higher alkali contents were less evident. COD removal on the other hand

did not follow a unique trend

instead exhibited a maximum. Based on our results

selection of a specific dose of alkali was carried out taking as reference the efficiency on total chromium removal

keeping the pH in the range 7 to 9 to ensure Cr precipitation as chromium hyd

roxide. With those conditions

jar test was used to produce enough liquid product in order to determine the removal percent of several other species. The removal percent of the species was as follows: Cr

ZnSO

FeSO

-1

NiSO

[Fe(CN)

]

at 99.8%

66.9%

99.6%

21.4%

70.9%

52.8% and 76.4% with CaO

and 99.8%

61.6%

99.9%

7.1%

84.0%

54.4% and 90.5% with Ca(OH)

respectively.

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⁰

Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)2

DOI：10.1016/j.cjche.2019.12.023

摘要

Abstract

关键词

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references

Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)₂