Aerobic thermophilic treatment of sewage sludge contaminated with 4-nonylphenol.
4-Nonylphenol (4-NP) occurs in sewage sludge as a result of the breakdown of detergents which contains nonylphenol ethoxylates (NPEs). 4-NP is of environmental concern because of its toxicity to biological systems. The present paper reports results of aerobic treatment under thermophilic conditions of sewage sludge artificially contaminated with 4-NP. Experiments were carried out using three parallel laboratory-scale batch reactors operating with blank, 50 and 100 mg/l of 4-NP concentration. For the two studied concentrations up to 66% 4-NP reduction was achieved at a specific air flow rate of 16 l/(l.h) and a thermophilic temperature of 60 degrees C, within 10 days of operation. The presence of 4-NP has minor effect on the rate of sludge oxidation and the nitrogen and phosphorous content in the sludge.
Banat
F A
FA
Department of Chemical Engineering, Jordan University of Science and Technology, Irbid. banatf@just.edu.jo
Prechtl
S
S
Bischof
F
F
D000332:Aerobiosis; D000388:Air; D006801:Humans; D007220:Industrial Waste; D010636:Phenols / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D018505:Waste Management / Q000379:methods; D014874:Water Pollutants, Chemical
D007220:Industrial Waste; D010636:Phenols; D012722:Sewage; D014874:Water Pollutants, Chemical; C041594:4-nonylphenol