Particle Size Distribution in Municipal Solid Waste Pre-Treated for Bioprocessing
Particle Size Distribution in Municipal Solid Waste Pre-Treated for Bioprocessing
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DOI：
10.3390/resources8040166
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Yue Zhang;S. Kusch-Brandt;S. Gu;S. Heaven
中科院分区：
文献类型：
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作者：
Yue Zhang;S. Kusch-Brandt;S. Gu;S. Heaven
虽然众所周知，颗粒尺寸的减小会影响厌氧消化或堆肥等生物处理的性能，但对于预处理有机材料中的颗粒尺寸分布（PSD），即颗粒在不同尺寸范围内的分布，相对缺乏了解。对机械-生物处理（MBT）预处理后的城市生活垃圾中的PSD进行了研究。在本研究的第一部分中，确定了英国两个全规模MBT工厂预处理废物中的PSD。本研究的主要部分包括减少用于生物处理的城市生活垃圾的颗粒大小和探索所获得的PSD模式的实验试验。使用了碎纸机和浸渍研磨机。对于剪切碎纸机，20毫米的颚口开口被发现有利于有效地减少颗粒尺寸，而较小的颚口开口则将湿有机废物压缩成球。将碎纸机颚口开度设置为20mm并不意味着在输出中所有颗粒都将是20mm或以下。PSD谱显示，每次试验中存在不同的颗粒大小。串联使用不同类型的设备可以有效地减少较大颗粒的存在。浸渍产生的PSD以非常细的颗粒为主，不适合堆肥，也可能用于厌氧消化。得出的结论是，粉碎，设备是精心选择的，是有效地提供一个材料非常适合厌氧消化或堆肥。
While it is well known that particle size reduction impacts the performance of bioprocessing such as anaerobic digestion or composting, there is a relative lack of knowledge about particle size distribution (PSD) in pre-treated organic material, i.e., the distribution of particles across different size ranges. PSD in municipal solid waste (MSW) pre-treated for bioprocessing in mechanical–biological treatment (MBT) was researched. In the first part of this study, the PSD in pre-treated waste at two full-scale MBT plants in the UK was determined. The main part of the study consisted of experimental trials to reduce particle sizes in MSW destined for bioprocessing and to explore the obtained PSD patterns. Shredders and a macerating grinder were used. For shear shredders, a jaw opening of 20 mm was found favourable for effective reduction of particle sizes, while a smaller jaw opening rather compressed the wet organic waste into balls. Setting the shredder jaw opening to 20 mm does not mean that in the output all particles will be 20 mm or below. PSD profiles revealed that different particle sizes were present in each trial. Using different types of equipment in series was effective in reducing the presence of larger particles. Maceration yielded a PSD dominated by very fine particles, which is unsuitable for composting and potentially also for anaerobic digestion. It was concluded that shredding, where equipment is well selected, is effective in delivering a material well suited for anaerobic digestion or composting.