Purification of electroplating wastewaters utilizing waste by-product ferrous sulfate and wood fly ash.
A new procedure for electroplating wastewater treatment using waste by-product (ferrous-sulfate) and waste (wood fly ash) is presented. Ferrous-sulfate was employed for Cr(VI) reduction whereas neutralization and heavy metal removal from electroplating wastewaters was performed using wood fly ash. Heavy metal removal efficiency varied from 97.5% for Cu to 99.973% for Zn. Satisfying results can be achieved already at the pH 8. The method is suitable for the purposes of wastewater treatment and disposal in compliance with environmental laws. Furthermore, it is technically simple, cost-efficient and requires less space compared to the classical methodology. According to the composition of its water extractable fraction remaining waste ash could be safely deposited on domestic waste repositories.
Orescanin
Visnja
V
Institute Rudjer Boskovic, Centre for Marine and Environmental Research, Zagreb, Croatia. vobescan@rudjer.irb.hr
Mikelic
Luka
L
Lulic
Stipe
S
Nad
Karlo
K
Mikulic
Nenad
N
Rubcic
Mirta
M
Pavlovic
Gordana
G
D002857:Chromium / Q000302:isolation & purification; D003247:Conservation of Natural Resources; D004595:Electroplating; D005296:Ferrous Compounds / Q000737:chemistry*; D017745:Incineration; D019216:Metals, Heavy / Q000302:isolation & purification; D014865:Waste Disposal, Fluid / Q000379:methods*; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014934:Wood
D005296:Ferrous Compounds; D019216:Metals, Heavy; D014873:Water Pollutants; D002857:Chromium; C074702:chromium hexavalent ion; C020748:ferrous sulfate