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Atmosphere | Free Full-Text | Emission Characteristics of Gaseous and Particulate Mercury from a Subcritical Power Plant Co-Firing Coal and Sludge
![Boiler wasn't heating, went downstairs and saw this? What even is this? Mildly thick brown sludge? : r/hvacadvice Boiler wasn't heating, went downstairs and saw this? What even is this? Mildly thick brown sludge? : r/hvacadvice](https://i.redd.it/gjfce92pysua1.jpg)
Boiler wasn't heating, went downstairs and saw this? What even is this? Mildly thick brown sludge? : r/hvacadvice
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