Regarding the issue of black suspended particles in gray water

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Dear seniors, there have been black particles suspended in our graywater system all along. The turbidity of graywater is also low, only in the teens, but there are always some suspended particles that cannot settle. Our system is in two phases, totaling three sets: one vaporization furnace in Phase 1, and two vaporization furnaces in Phase 2, all of which are space-grade furnaces. The three systems use the same type of coal, but this phenomenon did not occur in Phase 1. The settlement time in phase two is slightly lower than that in phase one, but it is still sufficient; it should not be a problem related to the settlement time. Some people say it’s a problem with the floating beads, but I found some documents stating that these beads are white or gray, while the particles in our system are black. I wonder if any of the seniors have encountered the same problem and how it was resolved?