Description: Das Projekt "Use of ozone technology for the advanced treatment of wastewater from productions using no recov-ered paper" wird vom Umweltbundesamt gefördert und von Papiertechnische Stiftung München durchgeführt. The project aims to assess the effects and determine the criteria for efficient advanced ozone treatment of effluents from paper mills using no recovered paper. Besides evaluating the influence of ozone on wastewater properties, this includes the determination of the ozone dosage and retention time required. Until now samples from biologically treated effluents of three different mills have been subjected to continuous ozone trials. An ozone dosage of 0.7 g O3/g COD0 reduced the COD by more than 40 percent in systems with COD0 between 230 (mill B) and 400 mg/l (mill A) prior to ozone treatment. The BOD5 could be increased from below detection limit to up to 49 mg/l by 0.7 g O3/g COD0, which means an increase in biodegradability, measured as BOD5/COD ratio, from 0.01 up to 0.23. The enhanced biodegradability of the ozone treated wastewater could also be shown in aerobic degradation tests. Where the COD in the original sample was only reduced by 4 percent in the relevant period, the COD of ozonized water was reduced by up to 40 percent in the same period (mill A). In samples taken from mill B the biological COD elimination was enhanced from 25 percent to 60 percent by ozone pre-treatment. In effluents from two mills the AOX was below detection limit, even before subjecting the water to ozone trials. In mill B the AOX could be reduced from 1,000 myg/l to 300 myg/l by 0.8 g O3/g CSB0. 0.7 g O3/g CSB0 reduced the colour at 436 nm significantly from 14 m-1 to 2 - 5 m-1 (mill A and B) and from 25 to 5 m-1 (mill C), respectively. Biological tests showed that the biologically treated wastewater was not toxic, neither before nor after ozone treatment or further biological treatment. The COD/DOC ratio of the effluent prior to ozone treatment differed between 3.1 and 3.6 for the tested mills, varied from sampling to sampling within the mills and was decreased by ozone treatment to 1.7. LC-OCD analysis showed that ozone treatment leads to a decrease in humics as well as in the aromaticity and molecularity of humics. Building blocks arise.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: München ? Kabeljau ? Ozon ? Biopharmazeutikum ? Altpapier ? Pflanzensamen ? Aerober Abbau ? Abwasserbehandlung ? AOX-Wert ? Betriebswasser ? Gebäude ? Industrieabwasser ? Ozonung ? Papier ? Gelöster organischer Kohlenstoff ? Abwasser ? Biologische Abbaubarkeit ? Biotest ? Mühle ? Nachweisgrenze ? Toxizität ? Wasserprobe ? Wirkungsanalyse ? Wasser ? Biologische Behandlung ? Biologische Probe ? Nachweisbarkeit ?
Region: Bayern
Bounding box: 12.53381° .. 12.53381° x 47.795° .. 47.795°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2007-10-01 - 2009-09-30
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