有机质
化学需氧量
废水
化学
粒径
分数(化学)
工业废水处理
化学成分
环境化学
工业废物
生化需氧量
溶解有机碳
制浆造纸工业
废物管理
环境科学
环境工程
色谱法
有机化学
物理化学
工程类
作者
Cholnatee Sophonsiri,Eberhard Morgenroth
出处
期刊:Chemosphere
[Elsevier]
日期:2004-05-01
卷期号:55 (5): 691-703
被引量:151
标识
DOI:10.1016/j.chemosphere.2003.11.032
摘要
A more detailed characterization of particulate organic matter in wastewater streams is needed to improve solid-liquid separation and biological processes for wastewater treatment. The objective of this paper was to evaluate particle size distributions and the associated chemical composition for municipal, industrial, and agricultural waste streams. Most of the organic matter in these wastewaters was larger than a molecular weight of 10(3) amu and therefore would require extracellular hydrolysis before any bacterial metabolism. Particle size distributions were significantly different for the studied waste streams. In municipal wastewater, the organic matter was evenly distributed in all eight size fractions ranging from 10(3) amu up to 63 microm. The industrial and agricultural wastewaters, however, contained mainly soluble organic matter (<10(3) amu) and larger particles (>1.2 microm for the industrial and >10 microm for the agricultural waste) leaving a gap in the size range of large macromolecules and colloids. The relative protein and carbohydrate concentrations varied for the different size fractions compared to the measured chemical oxygen demand (COD) in the corresponding size fraction. Thus, the design of the solid-liquid separation at a treatment plant could be used to purposefully modify the overall chemical composition of the organic matter before further biological treatment. Particle size distributions will influence design and operation of biological nutrient removal processes such as denitrification or biological phosphorus removal that may be carbon limited if a large fraction of the organic matter is composed of large particles with slow hydrolysis rates. Measured particle size distributions for the different waste streams in this study (municipal, industrial, agricultural) were significantly different requiring specific approaches for treatment plant design.
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