This study was aimed to evaluate the effectiveness of polyaluminium chloride (PACl) dosage into a pilot scale MBR fed with a mixed textile (65% as flow and 70% as COD load) and domestic wastewater in terms of permeate quality enhancement and fouling control. The pilot operated for 7.5 months without PACl (period P-1, flux: 10 LMH) and then with the addition of polyaluminium chloride (12.5 mg gMLSS-1) at 10 LMH for 3 months (period P-2) and at 12.5 LMH for other 3 months (period P-3). The addition of PACl resulted in a significant enhancement of permeate quality. In particular, between P-1 and P-2 removal rates related to total phosphorus and textile macro-parameters such as color and anionic surfactants, increased of +64%, +16% and +7%, respectively. No significant effect was observed on COD, non ionic surfactants and nitrogen compounds removal. Apart from color, macro-pollutants data were lower (P-1 and P-2) or close (P-3) to that of full scale Wastewater Treatment Plant, that comprised advanced treatments (high rate clarification and ozone oxidation). Differently, permeate color was similar to that of the filtered WWTP secondary effluent but double the value of the WWTP tertiary treatments effluent.
Removal rates enhancement by polyaluminium chloride in a Membrane BioReactor (MBR) treating textile wastewaters
TELI, ARONNE;ANTONELLI, MANUELA;BONOMO, LUCA;MALPEI, FRANCESCA
2012-01-01
Abstract
This study was aimed to evaluate the effectiveness of polyaluminium chloride (PACl) dosage into a pilot scale MBR fed with a mixed textile (65% as flow and 70% as COD load) and domestic wastewater in terms of permeate quality enhancement and fouling control. The pilot operated for 7.5 months without PACl (period P-1, flux: 10 LMH) and then with the addition of polyaluminium chloride (12.5 mg gMLSS-1) at 10 LMH for 3 months (period P-2) and at 12.5 LMH for other 3 months (period P-3). The addition of PACl resulted in a significant enhancement of permeate quality. In particular, between P-1 and P-2 removal rates related to total phosphorus and textile macro-parameters such as color and anionic surfactants, increased of +64%, +16% and +7%, respectively. No significant effect was observed on COD, non ionic surfactants and nitrogen compounds removal. Apart from color, macro-pollutants data were lower (P-1 and P-2) or close (P-3) to that of full scale Wastewater Treatment Plant, that comprised advanced treatments (high rate clarification and ozone oxidation). Differently, permeate color was similar to that of the filtered WWTP secondary effluent but double the value of the WWTP tertiary treatments effluent.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
