Unravelling the impacts of perfluorooctanoic acid on anaerobic sludge digestion process

2021 ◽  
pp. 149057
Author(s):  
Chen Wang ◽  
Lan Wu ◽  
Yu-Ting Zhang ◽  
Wei Wei ◽  
Bing-Jie Ni
Keyword(s):  
Perfluorooctanoic Acid ◽  
Anaerobic Sludge ◽  
Digestion Process ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion

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

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.

Fate ofCryptosporidiumoocysts,Giardiacysts, and microbial indicators during wastewater treatment and anaerobic sludge digestion

1999 ◽  
Vol 45 (3) ◽  
pp. 257-262 ◽  
Author(s):  
Christian Chauret ◽  
Susan Springthorpe ◽  
Syed Sattar
Keyword(s):  
Wastewater Treatment ◽  
Clostridium Perfringens ◽  
Heterotrophic Bacteria ◽  
The Other ◽  
Anaerobic Sludge ◽  
Somatic Coliphages ◽  
Aerobic Wastewater Treatment ◽  
Sludge Digestion ◽  
Cryptosporidium Oocysts ◽  
Anaerobic Sludge Digestion

The extent of reduction in selected microorganisms was tested during both aerobic wastewater treatment and anaerobic digestion of sludge at the wastewater treatment plant in Ottawa to compare the removal of two encysted pathogenic protozoa with that of microbial indicators. Samples collected included the raw wastewater, the primary effluent, the treated wastewater, the mixed sludge, the decanted liquor, and the cake. All of the raw sewage samples were positive for Cryptosporidium oocysts and Giardia cysts, as well as for the other microorganisms tested. During aerobic wastewater treatment (excluding the anaerobic sludge digestion), Cryptosporidium and Giardia were reduced by 2.96 log10and 1.40 log10, respectively. Clostridium perfringens spores, Clostridium perfringens total counts, somatic coliphages, and heterotrophic bacteria were reduced by approximately 0.89 log10, 0.96 log10, 1.58 log10, and 2.02 log10, respectively. All of the other microorganisms were reduced by at least 3.53 log10. Sludge samples from the plant were found to contain variable densities of microorganisms. Variability in microbial concentrations was sometimes great between samples, stressing the importance of collecting a large number of samples over a long period of time. In all cases, the bacterial concentrations in the cake (dewatered biosolids) samples were high even if reductions in numbers were observed with some bacteria. During anaerobic sludge digestion, no statistically significant reduction was observed for Clostridium perfringens, Enterococcus sp., Cryptosporidium oocysts, and Giardia cysts. A 1-2 log10reduction was observed with fecal coliforms and heterotrophic bacteria. However, the method utilized to detect the protozoan parasites does not differentiate between viable and nonviable organisms. On the other hand, total coliforms and somatic coliphages were reduced by 0.35 log10and 0.09 log10, respectively. These results demonstrate the relative persistence of the protozoa in sewage sludge during wastewater treatment.Key words: Cryptosporidium, Giardia, indicators, wastewater, sludge.

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