Description
Thickening is often the first step in a sludge treatment process. Sludge from primary or secondary clarifiers may be stirred (often after addition of clarifying agents) to form larger, more rapidly settling aggregates. Primary sludge may be thickened to about 8 or 10 percent solids, while secondary sludge may be thickened to about 4 percent solids. Thickeners often resemble a clarifier with the addition of a stirring mechanism.Thickened sludge with less than ten percent solids may receive additional sludge treatment while liquid thickener overflow is returned to the sewage treatment process.
FDT Series is Widely used prior to belt press, plate filter press , centrifuge and other kinds of sludge dewatering units in municipal and industry wastewater treatment .

Features
FDT Rotary Drum Thickener
1. Main structure made of stainless steel.
2. Cylinder tensioning device. Integrated dewatering  system, continuous auto running;
3. Optional of stainless steel and polyester for drum sieve belt cloth.
4. No operation fault as bearings adopt tin bronze (graphite) self-lubrication copper sleeve
5. Low Power  consumption : power requirement and greenhouse gas emissions, even including washwater booster pumps, are typically 20% ~30% of other sludge dewatering unit .
6. Widely used prior to belt press, plate filter press , centrifuge and other kinds of sludge dewatering units.
7. Polymer  rate : Offers the lowest possible polymer dosage rate
8. Enclosed : To fit covers around all the zones of the unit  so that ensure the worksite clean .

SFC Rotary Drum thickener mechanism
1. Sludge  pump into the mixing reaction tank, sufficiently stir and fully mixed with the polymer solution from polymer dosing system.
2. Sludge is rapidly flocculate into large particles by the fine particles, and large-group flocs  formed into the network structure, then flow into the rotating drum .
3.Most of the free water is released through the filter cloth of the drum . Reach the purpose of  pre-dehydration .


Application Field

Specification		FDT Series Rotary Drum Thickener
		FDT-20	FDT-25	FDT-35	FDT-40	FDT-50	FDT-70	FDT-100
Filter Opening(micron)		30~80	30~80	30~80	30~80	30~80	30~80	30~80
Treating Capacity (m3/hr) SS 0.4%~3 %		7.5~20	12~25	15~35	20~40	30~50	35~70	50~100
Dried Sludge D.S.(Kg./hr)		90~200	120~250	150~350	200~400	300~500	350~700	500~1000
Sludge outlet concentration (%)		3.5~11	3.5~11	3.5~11	3.5~11	3.5~11	3.5~11	3.5~11
Power Consumption (KW)	Driving Motor	0.37	0.55	0.75	0.75	0.75*2	1.1*2	2.2*2
	Thickener Motor	0.37	0.37	0.55	0.55	0.37*2	0.55*2	0.75*2
	Washing pump *	0.75	0.75	1.125	1.125	1.5	1.5	1.5
Filtrate Collecting Tray		YES	YES	YES	YES	YES	YES	YES
External Dimension (mm)	Length	3600	4100	4200	4700	4100	4200	4700
	Width	1200	1200	1500	1500	2100	2500	2500
	Height	1800	1800	2050	2050	1800	2050	2050
Reference Weight (kgs)		450	700	1200	1600	2800	3200	3800
* Washing pump for optional