US EPA

2078620 

Journal Article 

Degradation of nitroaromatic xenobiotics by ozonization and subsequent biological treatment 

Saupe, A; Wiesmann, U 

1996 

Yes 

Acta Hydrochimica et Hydrobiologica
ISSN: 0323-4320
EISSN: 1521-401X 

WILEY-V C H VERLAG GMBH 

BERLIN 

BIOSIS/96/24553 

24 

3 

118-126 

German 

10.1002/aheh.19960240302 

WOS:000168748000002 

BIOSIS COPYRIGHT: BIOL ABS. Ozonization for 2,4-dinitrotoluene (DNT) and 4-nitroaniline (NA) was conducted in completely mixed reactors by semi-batch tests. At pH 7, both direct and radical reactions contribute to the oxidation of the nitroaromatic compounds. In the dominantly mass transfer-limited reaction, a specific ozone absorption of A* = 3.0 ... 3.5 g g-1 was measured for a \ 98% elimination of the target compounds. About 80 ... 90% of the input ozone were absorbed, and 10 ... 20% left the system unreacted. At pH 7, the degree of DOC reduction increased linearly with the specific ozone absorption to final values of 35% (NA) and 44% (DNT), respectively. A subsequent biological treatment of the oxidation products by non-acclimated bacteria increased the degree of mineralization to 75%. Compared to ozonization alone, 35 and 50% of ozone were thus saved by the sequential chemical-biological process. Batch tests with a real wastewater from the alkaline hydrolysis of a mixture of 2,4,6-trinitroto 

dinitrotoluene; nitroaniline; dinitrobenzene; wastewater ozonization; biodegradation; mineralization