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By A.J. Dragt, J. van Ham

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Additional info for Biotechniques for air pollution abatement and odour control policies: proceedings of an international symposium, Maastricht, the Netherlands, 27-29 October, 1991

Example text

En& 1 (1%) 61-59 [a]H e 4 H, Proc Int. M e t . B i d Treatm. I d Gasy DECHEMA. Heidelberg March 24-26 (19sr). , part 1-11 Biopror Eng 3 (l991). 3W399 1331 P u n RH. d al.. G e m . Ene Handbook 6" d. , Rlnner N, in Biokcbtrology, Rehm H. Rced G. Cb. VCH-Verla&cscUschaR Weinheim vol 8, chap. 3(l981) Kohler H, Forlxhritt-Berichtc WI-Zeitsehr. Rcihc U P (1982). Schmldt F, European patent nr O-U3-222. (l986). Beck-Gsscbc B, Fartccbrilt-Berichte VDI-Zcitschr. Rcihe l5,68(1989). Schlpptti %VDI-BerichIe 735 (1989) 77-88.

4. NEED OF AN INTERNATIONAL APPROACH I would finally like to point out t h e importance of an international discussion such as this. In my view odor policy must be developed in a transnational context. That may a t first sound somewhat exaggerated, since odor nuisance is primarily a local problem. But international agreement would help when i t comes t o selecting methods for measuring and establishing norms for permissible levels of odor nuisance. I further would like t o 14 argue in favour of an international approach that measures t o tackle the problem will, as a rule, have to be implemented by companies, which are operating in a common market.

Data dealing with the concentration of micro-organisms in an effluent gas Erom a biological system are very limited. However, in recent years a few investigations have been a n i e d out on the subject (41,421 determining the number of microorganisms in effluent gases from full-scale as well as laboratory scaled biological waste gas purification systems. From the evaluation of the 30 results a number of important conclusions have been drawn. ’,which is of the same order of magnitude as the numbers encountered in indoor air and slightly higher than encountered in open air.

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