Considering the 2-to-1 ratio these recipes have, I guess that is a bit (with the current stats) a bit OP. I suggest including steel in both buildings recipes, maybe advanced circuits to electric one. Plus for electric one, should not have less pollution per plate than miners, e.g. 17.14 per ore while current settings yield 4.655, quarter of what I like to be. It's true it's electric, but more ore means massive pollution, also most pollution comes from miners even in the beginning of the game.
The space taken is really small compared with output, the easiest way is to quadruple either pollution or recipe time, preferring the later.
For recipes suggestion I say:
8 iron plate + 10 electronic circuit + 10 stone brick + 5 steel for macerator; and
30 iron plate + 10 electronic circuit + 5 advanced circuit + 20 stone brick + 15 steel for electronic macerator.
Recipe time is convenient with smelting time so I like changing time with multipliers of 3.5.