ISSN:
0956-6163
Source:
Emerald Fulltext Archive Database 1994-2005
Topics:
Medicine
,
Economics
Notes:
In this study tannery industrial wastewater was supplied from aleather industry plant in the south of Germany. An anaerobic pilot plantwas erected for the treatment of this wastewater. Discusses the effectof such an anaerobic process with special reference to the fate ofchronium and the other associated heavy metals throughout the process.The studied metals were Cr, Cd, Pb, Ni, Cu, Fe and Zn. The eliminationrate of these metals throughout the anaerobic processes from thewastewater and the increasing rate of metal correlations in the sludgewere studied extensively. Levels of Cr, Cu, Fe, Cd, Ni, Pb and Zn in theraw wastewater after acidification were 33.72, 0.13, 1.82, 0.06, 0.19,0.21 and 1.07 mg/l respectively. In the sludge the levels were 6,296,16, 141, 31, 12.4, 23 and 94 mg/kg dry weight respectively. The levelsof these metals were decreased by stabilization. The overall resultsrevealed that a remarkable decrease has been achieved in the reductionlevel of metals in the final wastewater. The elimination of such metalsreached 98 per cent for Cr, 53.8 per cent for Cu, 81.3 per cent for Fe,16.7 per cent for Cd, 21.1 per cent for Ni, 72.9 per cent for Zn. On theother hand, such metals were concentrated in the sludge, on the dryweight basis, up to the levels of 13,193 mg Cr/kg, 27.7 mg Cu/kg, 348 mgFe/kg, 3.2 mg Cd/kg, 13.7 mg Ni/kg, 28 mg Pb/kg and 110 mg Zn/kg.Meanwhile, the studied anaerobic process exhibited significantimprovement in the quality of the tannery wastewater to meet theguideline characteristics. However, the partial high level of Cr (III)and the other associated metals in the produced sludge strongly militateagainst the use of such tannery sludges as manure in agriculture.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1108/09566169510085135
Permalink
