Sludge treatment, reuse and disposal. Sludge is produced from the treatment of wastewater in on-site (e.g. septic tank) and off-site (e.g. activated sludge) systems. This is inherently so because a primary aim of wastewater treatment is removing solids from the wastewater.
The central vacuole is a cellular organelle found in plant cells. It is often the largest organelle in the cell. It is surrounded by a membrane and functions to hold materials and wastes. It also functions to maintain the proper pressure within the plant cells to provide structure and support for the growing plant.
The vacuole is the organelle that stores food, water, and waste.  They're are present in both plant and animal cells, but are more  prominent in plant cells.he central vacuole, an organelle that a plant cell has that an animal cell doesn't have, stores food, water, and wastes. The central vacuole also supports the plant cell's st â¦ ructure when full.