State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
Waste Manag. 2010 Jul;30(7):1165-70. doi: 10.1016/j.wasman.2010.01.011. Epub 2010 Jan 27.
Bio-drying can enhance the sortability and heating value of municipal solid waste (MSW), consequently improving energy recovery. Bio-drying followed by size sorting was adopted for MSW with high water content to improve its combustibility and reduce potential environmental pollution during the follow-up incineration. The effects of bio-drying and waste particle size on heating values, acid gas and heavy metal emission potential were investigated. The results show that, the water content of MSW decreased from 73.0% to 48.3% after bio-drying, whereas its lower heating value (LHV) increased by 157%. The heavy metal concentrations increased by around 60% due to the loss of dry materials mainly resulting from biodegradation of food residues. The bio-dried waste fractions with particle size higher than 45 mm were mainly composed of plastics and papers, and were preferable for the production of refuse derived fuel (RDF) in view of higher LHV as well as lower heavy metal concentration and emission. However, due to the higher chlorine content and HCl emission potential, attention should be paid to acid gas and dioxin pollution control. Although LHVs of the waste fractions with size <45 mm increased by around 2x after bio-drying, they were still below the quality standards for RDF and much higher heavy metal pollution potential was observed. Different incineration strategies could be adopted for different particle size fractions of MSW, regarding to their combustibility and pollution property.
生物干化可以提高城市固体废物（MSW）的可分选性和热值，从而提高能源回收效率。对于高含水量的 MSW，采用生物干化和尺寸分类，可以改善其可燃性，并减少后续焚烧过程中的潜在环境污染。研究了生物干化和废物颗粒尺寸对热值、酸性气体和重金属排放潜力的影响。结果表明，生物干化后 MSW 的含水量从 73.0%降至 48.3%，而低位热值（LHV）增加了 157%。由于主要由食物残渣生物降解导致干物质损失，重金属浓度增加了约 60%。粒径大于 45mm 的生物干化废物主要由塑料和纸张组成，考虑到更高的 LHV 以及更低的重金属浓度和排放，它们更适合生产垃圾衍生燃料（RDF）。然而，由于较高的氯含量和 HCl 排放潜力，应注意控制酸性气体和二恶英污染。尽管粒径小于 45mm 的废物经生物干化后其 LHV 增加了约 2 倍，但仍低于 RDF 的质量标准，且观察到更高的重金属污染潜力。可以根据 MSW 的可燃性和污染特性，对不同粒径的 MSW 采用不同的焚烧策略。
