Removal of Cr (VI) and Cu (II) from tannery effluent with water hyacinth and arum shoot powders: A study from Jashore, Bangladesh

Molla Rahman Shaibur,F.K Sayema Tanzia,Sayedunnesa Nishi,Nazneen Nahar,Shahnaz Parvin,Thomas Aquinas Adjadeh

doi:10.1016/j.hazadv.2022.100102

Molla Rahman Shaibur, F.K Sayema Tanzia + Show 4 more

Open Access

https://doi.org/10.1016/j.hazadv.2022.100102

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Abstract

The hexavalent form of chromium [Cr (VI)] and divalent form of copper [Cu (II)] are the major pollutants found in discharge effluents of tannery industries. Therefore, before discharging the effluent to the surrounding environment these elements need to be removed. Usually, low-cost bio-adsorbent are used to clean up the polluted effluent. Current research was conducted to determine the effectiveness of two bio-adsorbents namely water-hyacinth (Eichhornia crassipes) shoot powder (WSP) and arum (Colocasia sculenta) shoot powder (ASP) in removing chromium [Cr (VI)] and copper [Cu (II)] from tannery effluent (TE). To achieve the objectives, the two adsorbents were added to Cr (VI) and Cu (II) stock solutions (SS) and TE to determine their effectiveness in removing those metals. Removal of the metals from the SS and TE were investigated in batch processes at different contact times with the same bio-adsorbent doze of 5.0 mg L−1. The Cr (VI) and Cu (II) were determined with the Spectrophotometer HACH DR3900. Chromium was determined by using Method No. 8023 and Cu (II) was determined by using Method No. 8506. The highest amount of Cr (VI) removed from the SS and the TE with the WSP were 85.29% and 87.50%, respectively at 180 mins. The WSP removed the highest amount of Cu (II), 87.96%, from the SS at 180 mins whereas 83.35% was the highest removal from the TE at 120 mins. The ASP removed the highest amount of Cr (VI), 79.46%, at 180 mins from the SS, while 77.08% of the metal was removed from the TE for the same. The highest amount of Cu (II), 78.57%, was removed from SS at 180 mins with the ASP, while 75.0% was the highest amount removed from the TE at the same contact time. The WSP was more effective than the ASP in removing Cr (VI) and Cu (II) from both the solutions. From these results, it could be said that the WSP and ASP could be used as the alternative bio-adsorbents for removal of Cr (VI) and Cu (II) from polluted TE.

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