Hazardous waste and incinerator

[Sim]

My current setup for waste disposal looks like this:

Dump -> General Separation -> Waste Container Transfer

Technical services drop all mixed waste at the dump (which is then separated) and biological/hazardous waste to Waste Container Transfer directly.

Then incinerator setup is as follows:

Dump -> Incinerator -> Dump with Claw

Distribution office picks up all mixed garbage from Waste Container Transfer and drops off at the dump near incinerator. The garbage goes through and comes out as ash in the other dump with claw (which naturally disappears shortly). Works great and seems to rid of all useless waste.

The issue is with hazardous waste. Since it includes some non-burnable items (like metal scraps) - burning hazardous waste directly at incinerator produces mixed waste at the dump (composed of ash and scrap metals). Once the ash disappears it turns the other dump with claw into metal scrap storage automatically. Which is a problem as I need to manually empty out the scraps to make the flow work again (otherwise it starts using internal storage for ash and ash does not disappear in internal container storage).

Is there any way to improve this? The only option is to build hazardous waste treatment facility?

[Silent_Shadow]

The easy solution is to just have a waste truck waiting at the last dump to pick up any metal scrap, but this will still prevent ash filling the last dump until all of the scrap is picked up (doesn't sound like an issue in your case). Alternatively, you could just run the mixed waste through a metal separator to extract the scrap, but you may not need it at this rate of ash production.

[Sirius Czech]

You are obviously using too low throughput of your incinerator. This is the best starting setup (if you have seen my guide or not), the midgame setup is simply connected to dump with claw (or stands nearby and mixed ashes are trucked via line/DO) and you have there

dump->separation->dump->waste-to-power->dump with claw

This separates all the ashes and allows for imports of hazmat as well (which can be nice side source of income). The ash from the last dump is always clean in this case and you can earn some extra money on the way :)