UNEP Environmental Science- Solid waste management(4) composting Niu Dongjie niudongjie@tongji.edu.cn
Environmental Science— Solid waste management(4) composting Niu Dongjie niudongjie@tongji.edu.cn
Content oIntroduction o Principle of composting o Composting technology Water UNEP
Content Introduction Principle of composting Composting technology
Introduction ----Organic fraction in MSW 0.5 1.5 ■Food waste 51 Ash ■Plastics 8 45 ■Papers 10 ■Textile ■Wood 20 ■Rubber Organic fraction increase greatly In MSW UNEP
Introduction ----Organic fraction in MSW Organic fraction increase greatly In MSW
Why Compost? o Percentage of organic material increase o Agricultural wastes potential for nutrient pollution o Yard wastes-banned from landfills in some developed countries o Compost benefits to soil -11.4 kg N, 5.9kg P(as P2Os),and 3.2kg K (as K2O) per ton of compost o Environmental sustainability UNEP
Why Compost? Percentage of organic material increase Agricultural wastes potential for nutrient pollution Yard wastes – banned from landfills in some developed countries Compost benefits to soil – 11.4 kg N, 5.9kg P (as P 2 O 5), and 3.2kg K (as K 2O) per ton of compost Environmental sustainability
What is composting? UNEP
What is composting?