Tema Engineers gravity drainage decks are used to dewater thinner sludges, with low suspended solids of 0.3-1.5%. Typical applications of the gravity drainage decks include sewage sludges including raw waste activated; primary, aerobically and anaerobically digested; primary waste activated mixtures; extended aeration sludges; dissolved air flotation sludges; sewage lagoons; and water treatment alum lime.
The sludge is combined with a dilute polymer solution in the flocculation tank to form flocs. Free water drains away from the flocs on an inclined belt and ploughs turn the sludge to remove more
water. Dewatered sludge is removed from the belt with a doctor blade. High pressure water spray cleaning removes residual sludge, preparing the belt for incoming sludge from the flocculation tank.
The GDD works with the Tema belt filter press series for the added benefit of mechanical dewatering. Tema Belt Filter Presses (BFP) are used to dewater any type of sludge. Tema experienced engineers can customise their standard models for your specific requirements. Typical applications of the gravity drainage decks include: municipal and industrial sludge production by-products – e.g. from chemical, food, and paper processing mineral industries.
Benefits of the gravity drainage decks include:
- The TEMA Gravity Drainage Deck generates output of between 2 to 10 percent solids and can process between 20 to 160m3 per hour
- Our models are space efficient, offering continuous operation and excellent processing capability with a small footprint
- Economic to set up
- Low maintenance and running costs
- Saves on sludge transport costs by removing surplus water volume
- Speeds up performance of drying beds
- The new 7000 series design is more space efficient than conventional BFPs. Smaller diameter rollers exert higher pressures, increasing dewatering performance
- Economic to set up
- Minimal power requirements and automatic eration lower running costs
- Delivers excellent dewatering results
The sludge is combined with a dilute polymer solution in the flocculation tank to form floccs. Free water drains away from the floccs on an inclined belt and ploughs turn the sludge to remove more
water. The sludge is compressed between two belts which pass around a perforated roll, followed by 8 solid rolls. Water is squeezed out of the sludge throughout. Discharge rolls remove sludge from the belts prior to high pressure spray cleaning.