I think it would be nice to come up with something with liquids. By collecting water, we could create a hydroelectric power plant; at the same time, the land would also be moistened, thereby replenishing groundwater.

If we collect water in valleys, we could both create a lake and create a hazardous environment, making the surrounding area hazardous until the hazardous substances are extracted.

When mixing liquids, you need at least a filter to separate the fractions, water from oil or sewage, etc.

It's also strange why scrap metal, like other bulk materials, can't be stored in the field (similar to Sludge, Biomass, etc.). It seems odd that I can unload Depleted Uranium, but not regular biomass.