Composting of sewage sludge - Windrow turner applications Dipl.-Ing. Karsten Runge, BACKHUS GmbH Sigulda,

1. Sewage sludge treatment in Germany 2. Composting of sewage sludge 3. Windrow turner applications content

1. Sewage sludge treatment in Germany general figures

1. Sewage sludge treatment in Germany tendency – decreasing amount of sewage sludge

1. Sewage sludge treatment in Germany Compost from sewage sludge? – Yes, but quality please! Past situation: - problems with contaminations in compost from sewage sludge - decreasing acceptance for compost in agriculture Present situation: - increasing prices for mineral fertilizer - limited recourses on phosphate (prices +100% since 2004) - decreasing amount of heavy metals in sewage sludge - Farmers starting again thinking about compost Future outlook: 1. ongoing discussion about limits for heavy metals, PCB (“Klärschlammverordnung”) 2. installation of a quality assurance system for compost made from sewage sludge more information: Compost from sewage sludge – future outlook

2. Composting of sewage sludge general process design pre treatment (shredding, mixing) composting (regular turning & monitoring) fine treatment (screening) sewage sludge Compost structure material

Moisture C/N Ratio Oxygen 2. Composting of sewage sludge composting process design Main influences in composting process

2. Composting of sewage sludge increasing capacity process control hygenisation homogenisation turning makes the difference

3. BACKHUS Windrow Turner applications BACKHUS – Slupsk, Poland – t/a sewage sludge start:1999 structure:straw, green waste rotting:8 weeks turning:2 times per week product:agriculture & landscaping

3. BACKHUS Windrow Turner applications BACKHUS – Vilnius, Lithuania – t/a sewage sludge start:2005 structure:green waste rotting:3 month turning:1 - 2 times per week product:landscaping & agriculture

3. BACKHUS Windrow Turner applications BACKHUS 5.45 – Chojnice, Poland – t/a sewage sludge start:2000 structure:straw & bark rotting:6 month turning:1 - 2 times per week product:landscaping, agriculture, gardening, nurseries

3. BACKHUS Windrow Turner applications BACKHUS – Elk, Poland – t/a sewage sludge start:2006 structure:straw, green waste, wood waste from saw mill rotting:3 -5 month turning:2 - 3 times per week product:agriculture & landscaping

3. BACKHUS Windrow Turner applications BACKHUS – Lezajsk, Poland – t/a sewage sludge start:2004 structure:straw, wood waste from saw mill, tobacco waste rotting:6 month turning:2 - 4 times per week product:landscaping & gardening

3. BACKHUS Windrow Turner applications BACKHUS – Rumianek, Poland – t/a sewage sludge start:2006 structure:straw, chicken manure rotting:3 -4 month turning:1 times per week product:landscaping & gardening

3. BACKHUS Windrow Turner applications BACKHUS – Sarzyna, Poland – t/a sewage sludge start:2006 structure:straw rotting:6 month turning:2-3 times per week product:landscaping

3. BACKHUS Windrow Turner applications BACKHUS – Swarzewo, Poland – t/a sewage sludge start:2001 structure:straw, green waste rotting:6 month turning:2 times per week product:agriculture, gardening

3. BACKHUS Windrow Turner applications BACKHUS – Nordhorn, Germany – t/a sewage sludge start:2003 structure:straw rotting:2 - 4 month turning:2 - 3 times per week product:agriculture

3. BACKHUS Windrow Turner applications BACKHUS – Asendorf, Germany – t/a sewage sludge start:2005 structure:green waste rotting:6 - 8 weeks turning:1 - 2 times per week product:agriculture

3. BACKHUS Windrow Turner applications BACKHUS 9.45 – Luxemburg – t/a sewage sludge start:2000 facility:10 lanes aeration:under floor structure:green waste rotting:4 weeks composting 4 weeks maturation turning:2 - 3 times per week product:agriculture

3. BACKHUS Windrow Turner applications BACKHUS 5.45 – Nihyregyhaza, Hungary – t/a sewage sludge start:2002 structure:straw rotting:8 -12 weeks turning:2 - 3 times per week product:agriculture

BACKHUS Egypt – t/a sewage sludge 3. BACKHUS Windrow Turner applications start:2005 structure:straw rotting:6 weeks turning:3 times per week product:agriculture

BACKHUS – drying of sludge from WWTP – Australia – t/a 3. BACKHUS Windrow Turner applications

BACKHUS – composting of sugar cane waste – Columbia – t/a 3. BACKHUS Windrow Turner applications

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