The wastewater of leather industry which is one of the most widespread industries having large amount of water consumption and very high pollution loads, may be characterized by several key parameters including toxic pollutants exhibiting toxicity. Therefore the effluent of leather tanning industry must be handled carefully in terms of both choise of treatment process and the operation of the existing treatment plant. The aim of this study was to improve the coagulation process for toxicity reduction of raw wastewater taken from a leather tanning district central treatment plant in Solofra, Southern Italy. A series of jar test experiments were performed using poly-aluminium ferric chloride (PAFC) at 800-1200 mg/l dose interval and varying pH in the range of 8-9. pH was adjusted NaOH or Ca(OH)(2). The optimum coagulation conditions were determined as 8,5 pH, 900 mg/l PAFC with Ca(OH)(2) proving a 76% COD, 98% TSS removal and less than 50% D. magna immobilization at 50% dilution.
Toxicity reduction in leather tanning wastewater by improved coagulation flocculation process
Lofrano G;
2005-01-01
Abstract
The wastewater of leather industry which is one of the most widespread industries having large amount of water consumption and very high pollution loads, may be characterized by several key parameters including toxic pollutants exhibiting toxicity. Therefore the effluent of leather tanning industry must be handled carefully in terms of both choise of treatment process and the operation of the existing treatment plant. The aim of this study was to improve the coagulation process for toxicity reduction of raw wastewater taken from a leather tanning district central treatment plant in Solofra, Southern Italy. A series of jar test experiments were performed using poly-aluminium ferric chloride (PAFC) at 800-1200 mg/l dose interval and varying pH in the range of 8-9. pH was adjusted NaOH or Ca(OH)(2). The optimum coagulation conditions were determined as 8,5 pH, 900 mg/l PAFC with Ca(OH)(2) proving a 76% COD, 98% TSS removal and less than 50% D. magna immobilization at 50% dilution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
