Up-to-date modification of the anaerobic sludge digestion process introducing a separate sludge digestion mode

2001 ◽  
Vol 44 (10) ◽  
pp. 143-147 ◽  
Author(s):  
K. Sato ◽  
S. Ochi ◽  
M. Mizuochi
Keyword(s):  
Sewage Treatment ◽  
Anaerobic Sludge ◽  
Advanced Treatment ◽  
Treatment Mode ◽  
Primary Sludge ◽  
Sewage Treatment Plants ◽  
Advantages And Disadvantages ◽  
Digestion Process ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion

Sewage treatment plants in Japan are subjected to advanced treatment to remove nutrients and hence control eutrophication problems in lakes and bays. This paper discusses the advantages and disadvantages of the separate digestion treatment mode for sludge generated from advanced wastewater treatment. In the separate digestion only primary sludge is digested and the excess activated sludge is directly dewatered. Separate digestion can reduce the return load of nutrients to approximately one third, and has major potential for the beneficial use of sludge.

Electrochemical reduction of carbon dioxide to formate with Fe-C electrodes in anaerobic sludge digestion process

2016 ◽  
Vol 106 ◽  
pp. 339-343 ◽  
Author(s):  
Zisheng Zhao ◽  
Yaobin zhang ◽  
Yang Li ◽  
Huimin Zhao ◽  
Xie Quan
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Anaerobic Sludge ◽  
Digestion Process ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion

Formation and Biodegradation of Toluene in the Anaerobic Sludge Digestion Process

2005 ◽  
Vol 77 (3) ◽  
pp. 274-278 ◽  
Author(s):  
Boz˙ena Mrowiec ◽  
Jan Suschka ◽  
Tim C. Keener
Keyword(s):  
Anaerobic Sludge ◽  
Digestion Process ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion

scholarly journals THE IMPACT OF CHEMICAL PHOSPHORUS REMOVAL ON THE PROCESS OF ANAEROBIC SLUDGE DIGESTION

2010 ◽  
Vol 2 (5) ◽  
pp. 71-74
Author(s):  
Svetlana Ofverstrom ◽  
Ieva Sapkaitė ◽  
Regimantas Dauknys
Keyword(s):  
Anaerobic Digestion ◽  
Phosphorus Removal ◽  
Biogas Production ◽  
Anaerobic Sludge ◽  
Primary Sludge ◽  
Sludge Digestion ◽  
Volatile Solids ◽  
Anaerobic Sludge Digestion ◽  
Gas Volume ◽  
The Impact

The paper investigates the efficiency of the mixture of primary sludge and excess activated sludge in Vilnius WWTP with reference to the anaerobic digestion process. Sludge digestion was carried out under laboratory conditions using anaerobic sludge digestion model W8 (Armfield Ltd., UK). Laboratory analyses consist of two periods – the anaerobic digestion of the un-dosed and Fe-dosed sludge mixture. The results of digestion were processed using the methods of statistical analysis. The findings showed reduction in volatile solids approx. by 6% when dosing min FeCl3·6H2O and 15% when dosing max FeCl3·6H2O into feed sludge. Gas volume produced during the digestion of the un-dosed sludge was 90–160 ml/d and 60–125 ml/d in min Fe-dosed sludge and 45-95 ml/d. Also, correlation between VS loadings and biogas production was found. A rise in VS loading from 0,64 g/l/d to 1,01 g/l/d increased biogas production from 90 ml/d to 140–160 ml/d.

Treating an aged pentachlorophenol- (PCP-) contaminated soil through three sludge handling processes, anaerobic sludge digestion, post-sludge digestion and sludge land application

2001 ◽  
Vol 44 (10) ◽  
pp. 149-156 ◽  
Author(s):  
S.-T. Chen ◽  
P.M. Berthouex
Keyword(s):  
Contaminated Soil ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Land Application ◽  
Anaerobic Sludge ◽  
Primary Sludge ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion ◽  
Soil Cleanup ◽  
Sludge Application

The extensive pentachlorophenol (PCP) contamination and its increasing treatment costs motivate the search for a more competitive treatment alternative. In a municipal wastewater treatment plant, anaerobic sludge-handling processes comprises three bio-processes, namely the anaerobic sludge digestion, post-sludge digestion and sludge land application, which reduce sludge organic content and make sludge a good fertilizer for land application. Availability and effectiveness make the anaerobic sludge handling processes potential technologies to treat PCP-contaminated soil. The technical feasibility of using anaerobic sludge bioprocesses was studied by treating PCP soil in two pilot digesters to simulate the primary sludge digestion, in serum bottles to mimic the post-sludge digestion, and in glass pans to represent the on-site sludge application. For primary digestion, the results showed that up to 0.98 and 0.6 mM of chemical and soil PCP, respectively, were treated at nearly 100% and 97.5% efficiencies. The PCP was transformed 95% to 3-MCP, 4.5% to 3,4-DCP, and 0.5% to 3,5-DCP. For post-digestion, 100% pure chemical PCP and greater than 95% soil PCP were removed in less than 6 months with no chlorophenol residues of any kind. Complete removal of PCP by-products makes this process a good soil cleanup method. For on-site treatment, PCP was efficiently treated by multiple sludge application; however, the PCP residue was observed due to the high initial PCP content in soil. Overall, more mass PCP per unit sludge per day was processed using the primary sludge digestion than the on-site soil treatment or post-sludge digestion. And, sludge acclimation resulted in better PCP treatment efficiencies with all three processes.

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