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Grit separation and washing plants
Description and operation
This kind of plant is used for separating mineral parts from the so-called sand pulp, or mud, coming from a grit trap or other devices in the waste water treatment line. The sand pulp, being a mixture of mineral and organic material, is fed through the inlet pipe in the top part of the machine. When inside the machine, the content is rinsed by jets of water coming from a set of directional nozzles. The process, additionally supported by a mixer arm slowly rotating in the direction opposite to that of the rinsing system, serves separating the lighter organic particles and the heavier mineral particles (grit). As a result, the clean grit deposits on the bottom of the machine, while the fluidized organic slurry flows to the outlet pipe to be returned to the waste water treatment process.
The grit deposited on the bottom is removed by a screw conveyor and dewatered when travelling to a discharge container outside. The screw conveyor can be automatically controlled by means of a hydrostatic sensor mounted in the lower part of the machine.
Typical characteristics (SW-MT-7-15 type plant)
| capacity (sand pulp inflow rate) | – 7 to 15 l/s |
| capacity (grit output rate) | – 1500 kg/h |
| total length | – 4815 mm |
| separator width | – 2500 mm |
| total height | – 3400 mm |
| net weight | – ca. 1450 kg |
| loaded weight | – ca. 5100 kg |
| inlet diameter (of sand pulp) | – DN150 PN10 acc. to DIN 2576 |
| liquid outlet diameter | – DN200 PN10 acc. to DIN 2576 |
| organic slurry outlet diameter | – DN150 PN10 acc. to DIN 2576 |
| rinsing water connector | – 1″ (inner thread) |
| mixer drive power | – 0.55 kW |
| screw conveyor drive | – 0.75 kW |
| knife gate valve drive power | – 0.37 kW |
Typical performances
| separation efficiency | – 95% for grain size ≥ 0.2 mm |
| dewatering efficiency | – 85% |
| residual organic content | – ≥ 3% of ignition loss for up to 60% organic matter in the feed |
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