Municipal Wastewater Treatment by Periodic Biofilter without Excess Sludge Production

2005 ◽  
Vol 95 (6) ◽  
pp. 447-455 ◽  
Author(s):  
Claudio Di Iaconi ◽  
Roberto Ramadori ◽  
Antonio Lopez ◽  
Roberto Passino
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Excess Sludge ◽  
Sludge Production

scholarly journals ESTABLISHING A KINETIC EQUATION TO ESTIMATE SLUDGE PRODUCTION IN MUNICIPAL WASTEWATER TREATMENT BY MEMBRANE BIOREACTOR

2011 ◽  
Vol 14 (1) ◽  
pp. 56-64
Author(s):  
Uan Khac Do ◽  
Banu J. Rajesh ◽  
Ick T. Yeom
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Equation ◽  
Retention Time ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Biomass Concentration ◽  
Municipal Wastewater Treatment ◽  
Decay Coefficient ◽  
Theoretical Yield ◽  
Sludge Production

Sludge production in the membrane bioreactor treating municipal wastewater can be estimated from the kinetic equation which describes a relationship between sludge concentration and substrate, decay coefficient, sludge retention time and hydraulic retention time. Based on the experimental data and using the mathematical approximate method, the theoretical yield factor (Y) and the decay coefficient (kd) were found to be 0.33 mg VSS/mg COD and 0.04 1/day, respectively. Sludge production in the system can be estimated from the obtained kinetic equation. The calculated values were fluctuated around the measured ones. This result proved the potential application of the obtained equation for estimation of the biomass concentration and kinetic parameters in the wastewater treatment systems using membrane bioreactor technology.

Treatment of Excess Sludge Containing Heavy Metal by Chemical Ways

2012 ◽  
Vol 178-181 ◽  
pp. 507-511
Author(s):  
Zhi Min Zhang
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Metal Removal ◽  
Wastewater Treatment Plants ◽  
Heavy Metal Removal ◽  
Municipal Wastewater Treatment ◽  
Excess Sludge ◽  
Municipal Wastewater Treatment Plants

The concentration of heavy metals in excess sludge from municipal wastewater treatment plants has restricted its convertion to soil fertilizer, so it is necessary to remove the heavy metals from sludge. In this article, the effects of heavy metal removal by some mineral acids such as HCl, H2SO4, H3PO4, HNO3 were analysed, when treating excess sludge from a second sediment tank in municipal wastewater treatment plants. To improve the treatment, a combination of H2O2 and acid was also investigated. Consequently, the difference of heavy metal removal among those acids was showed. Its removal of Hg by HNO3 was better than by other acids. Lower pH enhanced the dissolving of heavy metal, yet the removal of Cr was insensitive to the pH. Aided by H2O2, the removal by the acid was enhanced. The suitable dosage of H2O2 was specially related to the solid content of sludge, pH and the acid kind.

STUDIES REGARDING THE PERFORMANCES OF MUNICIPAL WASTEWATER TREATMENT PROCESSES

2006 ◽  
Vol 5 (4) ◽  
pp. 685-692
Author(s):  
Elisabeta Chirila ◽  
Ionela Carazeanu Popovici ◽  
Techin Ibadula ◽  
Alice Iordache
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Treatment Processes
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