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Analysis of Adsorbable Organic Halogens Compounds

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Introduction “AOX” is the abbreviation of the sum parameter for water soluble “adsorbable organic halogens” in which ‘A’ stands for adsorbable, ‘O’ for organic and ‘X’ for the halogens chlorine, bromine and iodine. After the introduction of the AOX in 1976, this parameter has been correctly used for “real” AOX constituents (DDT and its metabolites, PCBs, etc.); but also misused for non-adsorbable adsorbed OX-compounds, mostly high molecular organohalogens in plants and even to inorganic compounds being neither organic nor adsorbable. The question of natural “Adsorbable Organic Halogens” (AOX) formed by living organisms and/or during natural abiogenic processes has been definitively solved by the known existence of already more than 3650 organohalogen compounds, amongst them the highly reactive, cancerogenic vinyl chloride (VC). In 1996, the European Committee for Standardization accepted the “Determination of adsorbable organically bound halogens (AOX)” as European Standard. 2. Physicochemical constants of major AOX compounds in Paper Mill Industry 2.1. Chloromethanols The typical Chloromethanols appear in paper milling industry is dichloromethane and trichloromethane. 2.2. X-phenol compounds: 2.3. X-benzene compounds: 2.4. X-dibenzodioxin compounds: 2.5. Dibenzofurans: 3. Virulence of some major AOX compounds Most of the AOX compounds have toxic effects. These compounds can accumulate in the animal/human fat tissue and lead to cancer, multiple animal/human organs damage and embryonic deformity. Research shows that different AOX compound will case different effects. The different toxic effects from different AOX compounds are shown in Table 3.1. Ta... ... middle of paper ... ...xidize and become less toxic. Usually, this method is combine with ozonation process. Membrane filtration is a filtration technique can well performance in remove color, AOX and COD from paper mill wastewater. Researchers find out that if membrane filtration combine with dissolved air flotation can result a much higher percentage removal of TOC, color and suspended solid. Also, membrane filtration is good for heavy metal removal. Ozonation is very useful in pulp wastewater treatment. This process can convert COD to BOD. Many chemical compounds are sensitive to ozonation process. So this process can have a large impact in decrease the concentration of AOX in pulp wastewater and other colored/colorless chemical compounds. Biological Treatment Performance Works Cited Treatment of pulp and paper mill wastewater—a review
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