New Trends in Removal of Heavy Metals from Industrial Wastewater

2021 ◽  
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Removal Of Heavy Metals

A review on polypyrrole-coated bio-composites for the removal of heavy metal traces from waste water

2019 ◽  
pp. 152808371987127 ◽  
Author(s):  
Subhankar Maity ◽  
Ashish Dubey ◽  
Supriyo Chakraborty
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Industrial Wastewater ◽  
Waste Water Treatment ◽  
Absorption Properties ◽  
Adsorption Capacities ◽  
Ion Absorption ◽  
Removal Of Heavy Metals ◽  
Day By Day

With the development of industrialization and human activities, discharge of waste water containing heavy metals in the environment is increasing day by day. It causes serious threats to the human civilization and the flora and fauna in this earth. Conducting polymers like polypyrrole and polyaniline can be used for treating wastewater due to their inherent ion absorption properties. This article has been focused on the development of polypyrrole coated bio-composites and their potential about the removal of heavy metals from industrial wastewater. Adsorption process can be successfully employed to remove heavy metals from the wastewater by the treatment of water with polypyrrole-coated composites. It was reported in literature that the polypyrrole and polyaniline-coated adsorbents had good adsorption capacities for Mg, Fe, Cu, Cd, Pb, Zn, and Ni. Polypyrrole-coated saw dust, rice husk, chitin, and cellulosic materials could be able to remove Cr, Fe, Cu, and Zn from wastewater. This method would be a replacement for costly conventional methods of removing heavy metal ions from wastewater. It is expected that this method would be an alternative for waste water treatment which will benefit the industries in future.

scholarly journals Implementation of Modified Acacia Tannin by Mannich Reaction for Removal of Heavy Metals (Cu, Cr and Hg)

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 352 ◽  
Author(s):  
Lorena Lugo ◽  
Alison Martín ◽  
John Diaz ◽  
Alejandro Pérez-Flórez ◽  
Crispin Celis
Keyword(s):  
Heavy Metals ◽  
Mannich Reaction ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Direct Mercury Analyzer ◽  
Removal Of Heavy Metals ◽  
Mercury Analyzer ◽  
Flocculation Process ◽  
Different Levels ◽  
Different Doses

The modified tannin by Mannich reaction was investigated for wastewater treatment. The removal of heavy metals, such as copper, chromium and mercury, in industrial wastewater was evaluated through the coagulation–flocculation technique, using modified Acacia tannin (MAT) as a coagulant agent. The successful tannin modification was evaluated by infrared spectopometry (FTIR), nuclear magnetic resonance (NMR); monitoring the removal of heavy metals was performed by atomic absorption (AA) and a direct mercury analyzer (DMA). Additionally, the parameters of water quality, total suspended solids (TSS), turbidity and chemical oxygen demand (COD) were assessed. Different doses of MAT were evaluated (375 ppm, 750 ppm, 1250 ppm and 1625 ppm) and three different levels of pH (4, 7 and 10). The highest percentages of removal obtained were copper 60%, chromium 87%, mercury 50%–80%, COD 88%, TSS 86% and turbidity 94%, which were achieved with the dose of 375 ppm of MAT at pH 10. The coagulation–flocculation process with the modified Acacia tannin is efficient for the removal of conventional parameters and for a significant removal of the metals studied.

Preparation of Nanometer Titanium Dioxide Adsorbent and its Application in Industrial Wastewater Treatment

2012 ◽  
Vol 573-574 ◽  
pp. 521-525
Author(s):  
Nan Zhang ◽  
Pu Liu ◽  
Ben Quan Fu ◽  
Li Na Wang
Keyword(s):  
Heavy Metals ◽  
Titanium Dioxide ◽  
Wastewater Treatment ◽  
Hydrochloric Acid ◽  
Surface Area ◽  
Industrial Wastewater ◽  
Operating Conditions ◽  
Adsorption Condition ◽  
Removal Of Heavy Metals ◽  
Nanometer Titanium Dioxide

In this paper, nanometer titanium dioxide was synthesized by a simple reaction. The prepared adsorbent was characterized by surface area and porosimetry analyzer and it was used for the removal of heave metals in industrial wastewater. The main parameters affecting the adsorption of heavy metals including pH, adsorption condition and elution condition have been investigated in detail. Under the optimized operating conditions, most of the target heavy metals could be fast removed. The adsorbent could be simply regenerated by hydrochloric acid. Thus, the prepared nanometer titanium dioxide was an adsorbent which is suitable for the removal of heavy metals in industrial wastewater.

Sign in / Sign up

Export Citation Format

Share Document