Thermal Sewage Sludge Disposal in Stationary Fluidized Bed

Thermal Sewage Sludge Disposal in Stationary Fluidized Bed Combustion DN 400 by using Fuel BRAM (fuel from solid waste) Dr. -Eng. Noama Shareef Senior Engineering Wastewater & Capacity Building Specialist In cooperation between: International Center for development &Migration-Germany /BAU University- Jordan

Learning objectives Introduction. Objectives and aims of sewage treatment. Disposal of sewage sludge in Germany. Future solutions for sludge problems in general Sewage sludge must be burned? (future disposal in Germany? ) Demonstration of low cost sludge/waste thermal treatment by: Stationary fluidized bed firing SWSFDN 400 (Steinbrecht). • Field Applications of SWSF DN 400 in several countries with several sludge and solid waste. • • •

Introduction • Sludge is the secondary product for the sewage water treatment plants. • More than 40% of cost of a treatment plant goes to sludge handling. • 2005, Germany: no disposal of sewage sludge in landfills. • sewage sludge must be burned? Is this a suitable future sludge disposal concept in Germany? ? ? No Agricultural use No Landfilling sewage sludge must be burned higher costs balance between soil-input and soil-output would be disturbed

Development of Sludge Disposal in Germany Sludge disposal in Germany after 2005: • Agriculture • Thermal • Landfill (no disposal of sewage sludge in landfills in Germany 2005). Sludge disposal In Germany Before 2005

Schematic view-Stationary fluidized bed firing SWSFDN 400 Observation Window Freeboard • The plant is designed at Uni-Rostock- Germany, on a semi-technical scale for research (Prof. Steinbrecht). • It is applied in several places for several countries. • Energy use of waste materials • The experimental tests of three different sludges combustion in the 200 kw by using fuel BRAM (fuel from garbage as energy resource). Fuel gas Observation Window Fuel feed Air input

Stationary fluidized bed firing SWSFDN 400 Screen of the Remote Control Computer, Prof. Steinbrecht, Germany.

Sludges test by SWSF DN 400 with respect of (17. BIm. Sch. V) Different 3 -Sludges to test: Influence/Effects on the SWSF process itself Process - Know - how Several different sludges were tested: • Anaerobic treated sludge, wastewater treatment Plant-Rostock, Germany. • Reed Bed Sludge wastewater treatment plant- Mühlbach in Stralsund, Germany. • Raw Sludge, wastewater treatment Plant in Homs -Sy. Additive Process-Management Energy Input -Waste/fuel Process Permitted emissions Used additives, waste Ash

Sludge starting material using BRAM (Soild waste) as fuel BRAM pellets and starting material Conveyor test, pumped digested sludge (DM: 16%, Heizwert: negativ)

The operation diagram of the sewage sludge from WWTP-Homs • The required minimum temperature of 850 ° C can be easily maintained. • Mixing ratio of 2. 6 reached. • For sulfur binding limestone is used. • Combustion temperature: 850 -880 ° C • Heavy metal content in waste gas according to the Ordinance on the incineration of waste (17 th BIm. Sch. V)

Primary Desulfurization in Freeboard (gas-bed) in SWSF DN 400 Combustion system DN 400 was designed to realize a self-sufficient combustion & to control the concentration of exhausted emissions (O 2, CO 2, NO 2, SO 2, Corg. . . ect) by measuring it before it coms out of the system. Ca. CO 3 Ca. O + CO 2 Thermal digestion in the fluidized bed H 2 S + 3/2 O 2 SO 2 + H 2 O Combustion in the fluidized bed SO 2 + 1/2 O 2 + Ca. O Ca. SO 4 Pollutant binding in the fluidized bed • Limestone granules can be reliably transported in the wet state with a screw conveyor in the SWSF reactor. • The limestone is thermally digested, it is formed fine particulate Ca. O. • The Ca. O reacts with the SO 2 and oxygen to form finely particulate Ca. SO 4, which is continuously discharged from the bed with the combustion exhaust gases.

Resluts product of SWSF (End product): Minimiz the treated sludge Volume to landfill Pyrolyseöl Pyrolysekoks Quelle: Steinbrecht , Uni Rostock, Germany

Result of Thermal Sludge treatment for several types of Sludges This technology was applicable for the different sludges from different wastewater treatment technologies which shows similar result and safe treatment , although of difirent chemical compositions, during thermal test by SWSF. This leads to • Minimize operational and disposal cost by low energy consumption. • Minimize sludge tratment process cost and operation (sludge drying, treatment, minimiz the sludge volume to landfill. . etc. . . ) • Good controll on emmisions with respect to German emission limits 17 Bim. Sch. V 1998

SWSF DN 400 - Applications in respect to limits 17 Bim. Sch. V 1998. SO 2 - eliminations in SWSF for other applications (raffirenier Homs) SWSF-combustion of petrokoks from the raffirenier Homs (Steinbrecht).