Powder could make cooking oil disposal easier
Porta-potties could make waste collection / conversion easy, provide jobs, and include handwashing stations
Human waste could be turned into energy, insect feed, and/or fertilizer
Wet wipes could be compostable, refillable, stylish, and biodegradable
Greywater recycling could be used
Hormones, antidepressants, steroids, antibiotics, pharmaceuticals etc. could be removed from drinking water
Treated sewage could provide water
Leaky septic tanks and fertilizer runoff could be prevented to provide seagrass to manatees
Urine / human waste could be used as large scale fertilizers
Ozone, UV light, and carbon could treat water instead of chlorine
Desertification could be limited with forests grown from wastewater
Foam could be used instead of wet wipes
Sewage could be converted into potable water and electricity
Sewer systems could use real-time monitoring and control "smart valve" technology