Computer simulations of microbial population dynamics in the activated-sludge process

1971 ◽  
Vol 5 (11) ◽  
pp. 1049-1066 ◽  
Author(s):  
C.R. Curds
Keyword(s):  
Population Dynamics ◽  
Activated Sludge ◽  
Computer Simulations ◽  
Microbial Population ◽  
Activated Sludge Process ◽  
Microbial Population Dynamics

Estimation of Biomass Concentration and Population Dynamics in a Captor® Activated Sludge System

1994 ◽  
Vol 29 (7) ◽  
pp. 149-152 ◽  
Author(s):  
M. P. Reddy ◽  
K. R. Pagilla ◽  
P. R. Senthilnathan ◽  
H. W. Johnson ◽  
P. S. Golla
Keyword(s):  
Population Dynamics ◽  
Activated Sludge ◽  
Microbial Population ◽  
Biomass Concentration ◽  
Activated Sludge Process ◽  
Free Swimming ◽  
Activated Sludge System ◽  
Suspended Growth ◽  
Fixed Film ◽  
The Media

A technique was developed to measure the equivalent MLSS in the fixed film Captor® media-activated sludge process. The technique accounts for the wear in the media as well as unequal wear in different media. The microbial population variations encountered during three years of full scale operation of the Captor® process, at the Moundsville WWTP were recorded. It has been found that fixed film media seem to support predominantly rotifers, followed by free swimming ciliates, and single stalk ciliates. In contrast, the suspended growth activated sludge population contained lower level organisms, mostly free swimming ciliates, followed by stalk ciliates, flagellates, and a few rotifers.

scholarly journals Anammox start-up strategies: the use of local mixed activated sludge seed versus Anammox seed

2018 ◽  
Vol 78 (9) ◽  
pp. 1901-1915 ◽  
Author(s):  
Bilge Alpaslan Kocamemi ◽  
Duygu Dityapak ◽  
Neslihan Semerci ◽  
Esra Keklik ◽  
Alper Akarsubası ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Population Dynamics ◽  
Activated Sludge ◽  
Microbial Population ◽  
Recovery Period ◽  
Process Performance ◽  
Start Up ◽  
Anammox Activity ◽  
Seeding Strategy ◽  
Microbial Population Dynamics

Abstract The start-up period of Anammox systems is still a big challenge due to the unavailability of large volumes of slowly growing Anammox seed locally in most countries. This study aims to evaluate the effects of seeding strategy on the start-up and enrichment period of Anammox systems by monitoring both process performance and microbial population dynamics. Two different seeding strategies, the use of mixed activated sludge culture from a local STP and the use of enriched Anammox culture transported from abroad, were comparatively studied in SBR systems operated for 410 days. The enriched Anammox seed from abroad inhibited seriously during transportation. Anammox activity re-started after 195 days' recovery period. An active Anammox culture was successfully enriched within 95 days from a local activated sludge source without seeding any Anammox. The Anammox population reached levels of 1011 copies/ng at the end of 410 days' enrichment period. Based on FISH, Ca. Brocadia anammoxidans and Ca. Scalindua species were dominant in the enriched culture. The maximum TNRR was observed as 430 mg N/day. DGGE analyses revealed a drastic change in the microbial community (56%) with Anammox enrichment. Phylogenetic analysis demonstrated a significant decrease in phylotype Proteobacteria and increase in phylotypes Planctomycetes, Chloroflexi and Acidobacteria with enrichment.

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