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Sewer pipes are similar to electric conduits (already in the game), connet on one end to toilets and the other to a black water tank; so you have a simple sewage system. Add some other thing like a "Hi-Tech something purifier" for clean water reclamation and maybe a few "algae-vats" for food or biomass production ; then you have a waste disposal/recycling system. Otherwise you can simply dump it somewhere. A grey water removal system maybe is an overcomplication, so the showers (for health and morale) could be linked to the sewer.

Thinking about life on a distant exoplanet has come to my mind that the colonists are still humans (maybe only some of them, and only temporaly) so they need a functioning sewage collection and disposal system; besides treating waste represents also an opportunity for increasing the total biomass available (which has numerous other uses aside for traditional farming), so what the community thinks about adding some sewer building? Also including a trash disposing and recycling system would be a nice touch or not?

AspenShadow you are right, with the term "genetic lab" i mean some tech that will allow to modify your colonists, also some cyber-improvements would be nice; i think that giving the game a little bit of transhumanist's feeling would distinguish it a lot from others sim games. Also as a side note i was thinking about waste recycling, i don't know if is planned but some type of sewage management like building sewer pipes and black and grey water holding tanks is needed. And for last according to me installing artificial lights on walls and/or ceilings is better than building small lamps.
P.S.
My english is not so great (nor my primary language) so with the last sentence i didn't want to sound presumptuous i know that programming a game is not an easy task.

Managing your water supply is a feature i would like to see implemented in the game.

Some hard sci-fi stuff:
3D printers - all purpose tools, weapons and parts builder
vat grown meat - increased food production, maybe mood boost (tasty homey beef)
robot assembly unit - build various various types of robots (farming, mining, construction, etc.)
robot control unit - colonists teleoperating robots
automatic surgery table - like the one in Prometheus (film)
water condenser - use electricity to condense water from air
water recycling - waste less water
heating system - for cold nights and eclipses
genetic lab - modifying animals, plants and colonists for a better future

Having mech suits would be nice, maybe in a simpler form is more fitting the setting. Also using simple robot for mining and/or bulding would be cool too.