Shafdan Sludge Thickening and Dewatwring Treatment
Dan Region - Central Israel
The Shafdan WWTP treats approximately 400,000 cubic meters per day of municipal wastewater, serving a population equivalent of 2.5 million, and is designed for biological nutrient removal (BNR).
In the past the waste activated sludge (WAS) was discharged to the sea through an outfall pipe. Due to a new environmental policy, the flow of WAS to the sea was stopped, and replaced with an alternative of sludge disposal.
The treatment includes:
- Sludge thickening by eleven (11) gravity belt thickeners (GBTs)
- Stabilization with thermophilic anaerobic digesters
- Dewatering by centrifuges
- Dewatered sludge removal by trucks from the dewatered sludge silos
Balasha-Jalon has prepared the general and detailed designs of the sludge thickening and dewatering facility. The design was based on 400,000 cubic meters of wastewater per day. The services included process, civil, mechanical electrical, control engineering, and general supervision of construction.
Volume of Waste Activated Sludge - WAS
25,600 - 32,000
m3/day
WAS Solids Weight
192
Ton dry solids/day
Design Data
- 25,600-32,000 cum/day
- 1,280-1,600 cum/hr
- 0.75%-0.6% solids concentration
- 196 ton/day solids (dry matter)
- 9.6 ton/hr solids (dry matter)
- Thickened sludge conc.: 4%-5%
Facilities
- Eleven (11) G.B.T units
- Polymers facility
- P.C feed and thickened sludge pumps
- Electrical and control
Design Data
- 3,840-4,800 cum/day
- 192-240 cum/hr
- 5%-4% solids concentration
- 196 ton/day solids (dry matter)
- 9.6 ton/hr solids (dry matter)
- Dewatered sludge conc.: 18%-24%
Facilities
- Five (5) decanter centrifuges
- Polymers facility
- P.C feed sludge pumps
- Special, high pressure P.C pumps for dewatered sludge
- Electrical and control
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