Final answer:
Sand filtration, enhanced biological phosphorus removal, and wastewater treatment are processes that can help clean or filter water.
Step-by-step explanation:
The processes that can help clean or filter water include sand filtration, enhanced biological phosphorus removal, and wastewater treatment.
Sand filtration involves passing water through a sand filter to remove particulate matter.
Enhanced biological phosphorus removal is a process where specific bacteria accumulate phosphorus to remove it from wastewater.
Wastewater treatment plants use multiple steps, such as pretreatment, primary treatment, secondary treatment, tertiary treatment, and disinfection, to remove contaminants from wastewater before it is released back into the environment.