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.
As stated earlier, the primary function of the central vacuole in plant cells is to maintain the turgor of the cell. Turgor is the pressure exerted on the cell wall by the contents of the cell. The central vacuole determines the amount of turgor based on it water content as a result of osmotic pressure.