The real problem with chemical wastewater
Chemical wastewater is nasty. It has fine suspended solids, high viscosity, and often oil mixed in. Regular treatment gear like plate and frame presses or screw presses clogs up fast. Then you have to stop and clean, which kills your production schedule.
Horizontal screw centrifuges don't clog easily. They're designed for high solid, high viscosity sludge. That's why they've become the standard solid liquid separator in chemical wastewater stations.
How it works
No filter screens or cloth. The drum spins fast, generating strong G force. Heavier solids get thrown to the wall, while cleaner liquid flows out the other end. It runs 24/7, which is what you need when your plant is making wastewater non stop.
What to watch on site
Pre treatment matters. Put a simple bar screen ahead of the centrifuge to catch rags, hard bits, and plastic. Otherwise they'll scratch the drum or cause breakdowns. You also need to add flocculant based on the sludge concentration-helps the fine particles form bigger clumps. With good operation, the dewatered sludge cake can hit 25% solids or more.
Economics
These things run mostly automatically. You don't need someone standing there all shift. Dewatering cuts sludge volume way down, so you pay less for disposal and transport. The separated water goes back to the treatment tank for another pass.