scholarly journals Zero emission technology of excess sludge. Research on the sludge disappearance type organism method (organism method by hydrothermal) using the hydrothermal reaction.

1999 ◽  
Vol 28 (8) ◽  
pp. 566-570 ◽  
Author(s):  
Sadaaki MURAKAMI ◽  
Minoru TANIGUCHI ◽  
Hideo SHIMIZU ◽  
Masami TAKEUCHI ◽  
Munetaka ISHIKAWA ◽  
...  
Keyword(s):  
Hydrothermal Reaction ◽  
Excess Sludge ◽  
Zero Emission

Application of hydrothermal reaction for excess sludge reuse as carbon sources in biological phosphorus removal

2005 ◽  
Vol 52 (10-11) ◽  
pp. 533-541 ◽  
Author(s):  
K. Kim ◽  
M. Fujita ◽  
H. Daimon ◽  
K. Fujie
Keyword(s):  
Reaction Temperature ◽  
Phosphorus Removal ◽  
Biological Treatment ◽  
Treatment Process ◽  
Hydrothermal Reaction ◽  
Carbon Sources ◽  
Biological Phosphorus Removal ◽  
Excess Sludge ◽  
Biological Phosphorus ◽  
Biological Treatment Process

An application of hydrothermal reaction was investigated to reuse excess sludge as carbon sources for enhancement of biological phosphorus removal. Under the tested conditions, solubilization of treated excess sludge did not present much variation, sustaining around 65%, except the results obtained at 400°C. Biodegradability of excess sludge was improved through its content change by the reaction, without much reduction of carbon contents even in 7min. From the results of respirometric test, readily biodegradable substrate was found at 300°C. Then its portion of reaction products increased with increasing reaction temperature. In the readily biodegradable substrate, acetic and propionic acid, which are useful carbon sources for phosphorus accumulating microorganism under anaerobic condition, increased with increasing reaction temperature. Hydrothermal reaction might be accepted as suitable pretreatment method to treat excess sludge prior to biological treatment process. This technology also secures excess sludge reuse, enhancing biological phosphorus removal and improvement of biological treatment process.

Control of refractory pollutants as useful resources by hydrothermal reaction coupled with biological treatment methods

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
K. Kim ◽  
M. Fujita ◽  
H. Daimon ◽  
K. Fujie
Keyword(s):  
Biological Treatment ◽  
Hydrothermal Reaction ◽  
Carbon Sources ◽  
Poly Vinyl Alcohol ◽  
Excess Sludge ◽  
Hydrothermal Conditions ◽  
Structural Conversion ◽  
Treatment Methods ◽  
Chloroacetic Acids ◽  
The Moment

Relationship between structural conversion of refractory pollutants and their biodegradability improvement was clarified under various hydrothermal conditions to know the usability of treated refractory pollutants in biological treatment methods. Hydrothermal reaction was also verified by using real wastewater. High-molecular-weight structured poly vinyl alcohol and hydrocarbon structured chloroacetic acids were partially fractured by hydrolysis and dehydration at the beginning of hydrothermal reaction. Then partially fractured refractory pollutants were rapidly converted to easily degradable substances by thermal decomposition depending on hydrothermal conditions. This significant change occurred within 3 min from the moment reaching the desired conditions at 350 and 400oC. These results were very similar to the results of soybean milk, except dyeing wastewater involving aromatic compounds. Excess sludge treated by hydrothermal reaction was also converted to easily degradable substrate as carbon sources in a bioreactor. Hydrothermal reaction should be adjusted to increase the amount of biodegradable products in reactants, without much reduction of total organic carbon. The content change of refractory pollutants and excess sludge by hydrothermal reaction was the most important factor on the viewpoint of treated reactant reuse, for the following biological treatment methods.

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