scholarly journals Zero emission technology of excess sludge. Effect of excess sludge reduction in excreta disposal treatment plant by saponin addition.

1999 ◽  
Vol 28 (8) ◽  
pp. 539-542 ◽  
Author(s):  
Yasuhiro KOSAKI ◽  
Eiichi TASHIRO ◽  
Munetaka ISHIKAWA
Keyword(s):  
Treatment Plant ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Zero Emission ◽  
Excess Sludge Reduction

Comparison between ozonation and the OSA process: analysis of excess sludge reduction and biomass activity in two different pilot plants

2012 ◽  
Vol 66 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Michele Torregrossa ◽  
Gaetano Di Bella ◽  
Daniele Di Trapani
Keyword(s):  
Municipal Wastewater ◽  
Process Analysis ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Anaerobic Sludge ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Biomass Activity ◽  
Excess Sludge Reduction ◽  
Ozone Contactor

The excess biomass produced during biological treatment of municipal wastewater represents a major issue worldwide, as its disposal implies environmental, economic and social impacts. Therefore, there has been a growing interest in developing technologies to reduce sludge production. The main proposed strategies can be categorized according to the place inside the wastewater treatment plant (WWTP) where the reduction takes place. In particular, sludge minimization can be achieved in the wastewater line as well as in the sludge line. This paper presents the results of two pilot scale systems, to evaluate their feasibility for sludge reduction and to understand their effect on biomass activity: (1) a pilot plant with an ozone contactor in the return activated sludge (RAS) stream for the exposition of sludge to a low ozone dosage; and (2) an oxic-settling-anaerobic (OSA) process with high retention time in the anaerobic sludge holding tank have been studied. The results showed that both technologies enabled significant excess sludge reduction but produced a slight decrease of biomass respiratory activity.

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