Replacing chemicals in recycle mills with mechanical alternatives

Technology, Institute of Paper Science

United States. Department of Energy. Golden Field Office.

关键词: Oxidizers;    Dollars;    Recycling;    09 Biomass Fuels;    Wood;   

DOI  :  10.2172/828245
RP-ID  :  DE-FC36-99GO10381
RP-ID  :  FC36-99GO10381
RP-ID  :  828245

美国|英语

来源: UNT Digital Library

【 摘 要 】

A high-intensity spark fired underwater decomposes a small amount of the water into hydroxyl radicals, which are strong oxidants. These are able to oxidize contaminants such as glue and wood pitch that enter paper recycling mills as a part of the incoming furnish and cost the industry several hundred million dollars. The sparking technique is safe, inexpensive, and is capable of treating large volumes of water, which makes it attractive for mill applications. Several mill trials were run. Sparking caused a decrease in the tack of the deposits in one case. Lower bleach use occurred in two other mills; sparking reduced the degree of ink reattachment to fiber. The payback for either application is attractive. Sparking induced deposition of contaminants in another mill, which is a positive development--if it can be controlled. The technique is also able to degas water and to oxidize odor-causing sulfur compounds. Although one unit has been purchased by a mill, second-order effects caused by the technology needs to be defined further before the technology can be broadly applied.