Abstract
Due to the fast depletion of water reserves globally, the toxicity of heavy metals and the negative impact posed to the environment; the current focus in wastewater treatment is now on the removal and re-use of these heavy metals rather than removal and disposal in landfills. This study investigated the use of hydrazine as a reducing agent to remove and recover Ni, Cu and Fe from wastewater by reduction crystallization. Feasibility studies were carried out to test the efficiency and find the optimum operating conditions for this method and generate an understanding of the chemical and particulate process occurring. The experiments were conducted on a 20L batch reactor using synthetic solutions containing a mixture of nickel, copper and iron. The results show that hydrazine can recover and crystallize Ni, Cu and Fe into their elemental form: 99.30% Ni was removed from the Ni-solution, 99.26% Ni and 98.81% Cu were removed from the Ni-Cu solution, over 99.90% Ni and 97.70% Fe were removed from the Ni-Fe solution. Evolution of the PSD revealed that breakage and molecular growth were the predominant particulate processes occurring, a finding which was validated by the scanning electron micrographs of the powder obtained.
Original language | English |
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Title of host publication | Water Resources Management VI |
Publisher | WITPress |
Pages | 681-690 |
Number of pages | 10 |
Volume | 145 |
ISBN (Print) | 9781845645144 |
DOIs | |
Publication status | Published - 2011 |
Event | 6th International Conference on Sustainable Water Resources Management, WRM 2011 - Riverside, CA, United States Duration: May 23 2011 → May 25 2011 |
Other
Other | 6th International Conference on Sustainable Water Resources Management, WRM 2011 |
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Country/Territory | United States |
City | Riverside, CA |
Period | 5/23/11 → 5/25/11 |
All Science Journal Classification (ASJC) codes
- General Environmental Science