Microbiology Photos

Print
Press Enter to show all options, press Tab go to next option

Microscopic Organisms in Activated Sludge

stalked400x.jpg (73061 bytes)

stalkedcloseup.jpg (58455 bytes)

flocstalked.jpg

stalked ciliate.jpg

Stalked Ciliates: Stalked ciliates feed on the stray bacteria cells. They are easily identified from other ciliates because the main body of the organism is attached to a stalk that is usually implanted in the floc. Stalked ciliates are very efficient feeders and will predominate when the food to microorganism ratio (F:M) is low. They also do best when there are higher dissolved oxygen readings.

acradine orange.jpg (24631 bytes)

Bacteria from an Nitrifying Trickle Filter (NTF) stained with acridene orange.  The stain makes
DNA appear yellow and
RNA appear orange.

nsnb2.jpg (12256 bytes)

Nitrifying bacteria stained with oligo's. 
The green stain is Nitrobacter,
the red, Nitrosomonas.

Z Ns Cluster Nso.jpg (8458 bytes)

Z Spirillum DAPI.jpg (6243 bytes)

Z Spirillum EUB.jpg (6770 bytes)


rotifer.jpg (10324 bytes)

rotifer2.JPG (36169 bytes)

Rotifers: Rotifers are very large as compared to other organisms. Unlike the protozoa, they are multicellular organisms. The rotifers are only found as the sludge age increases because it takes three days for their eggs to hatch. The principal role of rotifers is the removal of bacteria and the development of floc. Rotifers contribute to the removal of effluent turbidity by removing non-flocculated bacteria. Mucous secreted by rotifers at either the mouth opening or the foot aids in floc formation.

filaments100x.jpg (80070 bytes)

Filamentous bacteria serve as the backbone of floc formation. Sludge settles most efficiently when it contains a moderate number of filaments which provide structure for the floc and aid in the stripping of the water column. The floc cannot form properly if there are too few filaments, and the floc cannot settle properly if there are too many. The filamentous bacteria are analyzed in two ways: their effect on floc structure and their abundance.

ciliate400x.jpg (56511 bytes)

PARAMECIUM.JPG (8092 bytes)

Free-swimming ciliates: Free-swimming ciliates are identified by the cilia that surround most or all of their bodies. Free-swimmers swim faster than flagellates so they can out compete them for food. Free-swimmers are usually found when no large flocs have been formed so that it is easier to swim around.

nocardia.jpg (48890 bytes)

nocardiaoutbreak.jpg (30873 bytes)

Nocardia: A filamentous organism that has a hydrophobic (water repellant) waxy nature.  Nocardia floats under aeration making it difficult to waste from the system.  The foam layer that results entraps other organisms.

tokophrya mollis.JPG (37733 bytes)

sn-9.jpg (57843 bytes)

beggiatoa400x.jpg (45926 bytes)

Tokophrya Mollis

Snail egg?

Beggiatoa at 400x