Enia Carpets BV - Wastewater treatment plant for wastewater containing dyes and latex from carpet production - Case Study
Enia Carpets BV, a company based in Goirle in the Netherlands, manufactures and dyes carpets. The production of latex backings for the carpets creates wastewater, e.g. when cleaning the tanks and during mixing and adhesion.
During the carpet dying process, wastewater is generated as a result of rinsing processes and when the tanks are cleaned. The wastewater from these two processes is buffered separately in large tanks so that it can undergo homogenisation. After the quality of both types of wastewater has been homogenised, they are pumped to the treatment reactor, controlled by a PLC. Iron chloride, lime milk and flocculating agents are automatically dosed while the stirrers are running. The contaminants clump together to form filterable flocs that form a sediment once the stirrer has been turned off. The clear supernate then undergoes final pH testing before being discharged into the sewage system. A chamber filter press compresses the sedimented thin sludge into semisolid filter cake.
- Throughput: 12.5 m³/batch
- Solids content: 2-4%
- Temperature of latex wastewater: 20 °C
- Temperature of dye wastewater: 90 °C
- Space requirements: 50 m² on 2 floors
- Energy requirements: 1 kWh/m³
- Material: PP
- Control system: Siemens S7 PLC
- Filter press volume: 416 l
- Filter press system: Automatic plate transport