Complete Nitrogen Removal from Synthetic Anaerobic Sludge Digestion Liquor through Integrating Anammox and Denitrifying Anaerobic Methane Oxidation in a Membrane Biofilm Reactor

2016 ◽  
Vol 51 (2) ◽  
pp. 819-827 ◽  
Author(s):  
Guo-Jun Xie ◽  
Chen Cai ◽  
Shihu Hu ◽  
Zhiguo Yuan
Keyword(s):  
Methane Oxidation ◽  
Nitrogen Removal ◽  
Biofilm Reactor ◽  
Anaerobic Methane Oxidation ◽  
Anaerobic Sludge ◽  
Sludge Digestion ◽  
Membrane Biofilm Reactor ◽  
Anaerobic Sludge Digestion

Kinetics of anaerobic methane oxidation coupled to denitrification in the membrane biofilm reactor

2019 ◽  
Vol 116 (10) ◽  
pp. 2550-2560 ◽  
Author(s):  
Youneng Tang ◽  
Zhiming Zhang ◽  
Bruce E. Rittmann ◽  
Hyung‐Sool Lee
Keyword(s):  
Methane Oxidation ◽  
Biofilm Reactor ◽  
Anaerobic Methane Oxidation ◽  
Membrane Biofilm Reactor ◽  
Kinetics Of

A membrane biofilm reactor achieves aerobic methane oxidation coupled to denitrification (AME-D) with high efficiency

2008 ◽  
Vol 58 (1) ◽  
pp. 83-87 ◽  
Author(s):  
O. Modin ◽  
K. Fukushi ◽  
F. Nakajima ◽  
K. Yamamoto
Keyword(s):  
Methane Oxidation ◽  
High Efficiency ◽  
Biofilm Reactor ◽  
Practical Application ◽  
Suspended Culture ◽  
Consumption Ratio ◽  
Membrane Biofilm Reactor ◽  
Nitrate Consumption ◽  
Attached Culture ◽  
Aerobic Methanotrophs

Methane would potentially be an inexpensive, widely available electron donor for denitrification of wastewaters poor in organics. Currently, no methanotrophic microbe is known to denitrify. However, aerobic methane oxidation coupled to denitrification (AME-D) has been observed in several laboratory studies. In the AME-D process, aerobic methanotrophs oxidise methane and release organic metabolites and lysis products, which are used by coexisting denitrifiers as electron donors for denitrification. Due to the presence of oxygen, the denitrification efficiency in terms of methane-to-nitrate consumption is usually low. To improve this efficiency the use of a membrane biofilm reactor was investigated. The denitrification efficiency of an AME-D culture in (1) a suspended growth reactor, and (2) a membrane biofilm reactor was studied. The methane-to-nitrate consumption ratio for the suspended culture was 8.7. For the membrane-attached culture the ratio was 2.2. The results clearly indicated that the membrane-attached biofilm was superior to the suspended culture in terms of denitrification efficiency. This study showed that for practical application of the AME-D process, focus should be placed on development of a biofilm reactor.

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.

Sign in / Sign up

Export Citation Format

Share Document