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Solid liquid waste management – Waste sludge handling

municipal and industrial wastewater
undergoes various treatment steps in wwt PS before it is released back into
rivers and other waterways in secondary clarifiers most sludge is collected and
recycled back to the aeration basin to generate a stable and productive active
sludge for nutrient removal however as more and more sludge enters the plant
over time and a certain sludge age has to be maintained some sludge has to be
removed from the process removed sludge is also known as waste activated sludge
W a s w a s might contain toxic components so that it cannot be released
into the environment depending on the size of the facility location and sludge
volume different side stroke liquid waste management options are available
smaller plants in rural areas often compost sludge and or use sludge drying
beds for dewatering the remaining sludge cake is either hauled off and disposed
in landfills or in case the sludge doesn’t contain toxic components it’s
used as fertilizer sludge drying beds are a low-cost solution for sludge
dewatering however they require a lot of space and cause odors therefore in areas
with a denser population sludge is mechanically D watered for example with
centrifuges or sludge presses more people equal more sludge volume a sludge
hauling is expensive and a lot of sludge is available it makes economically sense
to treat the sludge chemically to remove toxic components and to use most of it
as fertilizer finally in metropolitan areas with
limited space and very high Slug volumes energy production from lwas is often
economically beneficial in anaerobic digesters microorganisms break down the
organic matter in the sludge and convert parts of it to methane and natural gas
the gas is then burned to either generate electricity or to produce heat
additionally mechanical dewatering might be used to produce fertilizers or to
prepare the sludge cake for incarceration where it’s generating more
electricity in the u.s. about 35% of lwas is used as fertilizers for
agriculture 25% is disposed in landfills and each 15 percent is composted or
incinerated the remaining 10% is treated in anaerobic digesters or processed in
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