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.
C) central vacuole A) food vacuole- store food in cell B) contractile vacuole- stores food, wastes, pigments, toxic materialsacuole- remove excess water from cell (found in fresh water cells protozoans) C) central vacuole- stores food, wastes, pigments, toxic materials (to taste bitter so won't get eaten) (plant)