In treatment of sewage one process used is the activated sludge process in which air is passed through a mixture of sewage and old sludge to allow the micro-organisms to break down the organic components of the sewage. Sludge is continually drawn off as new sewage enters the tank and this sludge must then be settled so that the supernatant (the remaining liquid) can be separated to pass on to further stages of treatment.
Sludge bulking occurs when the sludge fails to separate out in the sedimentation tanks. The main cause of sludge bulking is the growth of filamentous bacteria.[1]
Filamentous microorganisms grow in long strands that have much greater volume and surface area than conventional floc and are very slow to settle. Under certain growing conditions, filamentous organisms predominate. There is little robust scientific evidence that can be used to avoid sludge bulking but what there is indicates that over-loading works, having a carbohydrate rich input and having too low a recycle rate may all contribute.[citation needed]
To avoid sludge bulking some of the flow that enters the reactor can be bypassed, recycle ratio can be increased, lime or soda can be added to the reactor or the re-aeration rate increased.[citation needed]
^C. C. Lee and Shun Dar Lin (2007). Handbook of environmental engineering calculations (2nd ed.). McGraw-Hill Professional. p. 1.550. ISBN 9780071475839.
of treatment. Sludgebulking occurs when the sludge fails to separate out in the sedimentation tanks. The main cause of sludgebulking is the growth of...
aerators (cones) or, rarely, pure oxygen aeration. Sludgebulking can occur which makes activated sludge difficult to settle and frequently has an adverse...
and Control of Activated SludgeBulking and Foaming (2nd ed.). Michigan, USA: Lewis Publishers. p. 15. ISBN 0873718739. "SLUDGE VOLUME INDEX (SVI)". Retrieved...
sludgebulking Sphaerotilus natans is often associated with a buoyant floc (or "bulkingsludge") causing poor solids separation in activated sludge clarifiers...
Sewage sludge treatment describes the processes used to manage and dispose of sewage sludge produced during sewage treatment. Sludge treatment is focused...
removal of sludge). The sludge removed from the liquid line goes to the sludge treatment line. Aerobic processes (such as the activated sludge process)...
removal of sludge). The sludge removed from the liquid line goes to the sludge treatment line. Aerobic processes (such as the activated sludge process)...
settling tank in the activated sludge process. The excess sludge has to be removed from the system. The process is prone to bulking of solids and the treatment...
bacterium from the genus of Terrimonas which has been isolated from bulkingsludge from a wastewater treatment plant from Beijing in China. "Terrimonas"...
the carbon to nitrogen ratio. Bulking material also covers feces and reduces insect access. Absent sufficient bulking material, the material may become...
from the genus of Neomegalonema which has been isolated from activated bulkingsludge from industrial wastewater in Grindsted in Denmark. LPSN lpsn.dsmz.de...
Filamentous Anaerobes Belonging to the Phylum KSB3 That Cause Bulking in Methanogenic Granular Sludge". Applied and Environmental Microbiology. 77 (6): 2081–2087...
centrifuge and cleaning out the sludge space inside the bowl. The simpler design does not have the hydraulic mechanism for sludge ejection thereby eliminating...
sewage treatment plant is often accomplished using conventional activated sludge systems. These systems generally require large surface areas for treatment...
separation and classification and as a separator of sand from water or sludge Oil-water separation: Separation of oil and water in, among other things...
some dry bulking material such as sawdust, wood chips, or shredded yard waste under controlled aerobic conditions. Alkaline Treatment: The sludge is mixed...
Manufactured topsoil based on minerals, biosolids, compost and/or paper mill sludge is available commercially. A Victorian open-cut coal mine was rehabilitated...
is used as part of the process to treat biodegradable waste and sewage sludge. As part of an integrated waste management system, anaerobic digestion reduces...
Development of the standard approach to minimising the effects of bulkingsludge on activated sludge Only public body of extensive research of trickling filters...
metals compared to other types of compost composed of things such as sewage sludge. This can protect consumers and the environment from biomagnification caused...
peat, animal wastes, plant wastes from agriculture, and treated sewage sludge. Minerals can be mined from fossil products of animal activity, such as...
100% of patients on TPN longer than 13 weeks develop biliary sludge. The formation of sludge is the result of stasis due to lack of enteric stimulation...
to reduce friction and wear on moving parts and to clean the engine from sludge (one of the functions of dispersants) and varnish (detergents). It also...
opens a new product range for themselves. In 1972 the first WinklePress for sludge dewatering was launched. In 1994 the brothers Philipp, Martin and Erich...
biological flocs (the sludge blanket) to settle, thus separating the biological sludge from the clear treated water. Part of the waste sludge is recycled to...
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