Original scientific paper
Municipal Wastewater and Pig Slurry Treatment in a Batch Reactor
Brigita Tepuš
; Komunalno podjetje Ptuj d.d., Puhova ulica 10, SI- 2250 Ptuj, Slovenia
Milenko Roš
; The National Institute of Chemistry, PO BOX 660, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
Abstract
The degradation of organic compounds, and TKN elimination were studied in a batch reactor under different aerobic and anoxic/anaerobic conditions. The objective of this experimental procedure was to reduce to below 100 mg L-1 and to below 10 mg L-1. The experiments were carried out in such a way that the aeration and non-aeration phases were repeated, in sequences. The following systems were tested: 2+2 (2 h of aeration and 2 h without aeration), 3+2, and 4+1. Satisfactory results were obtained in all cases. The expected results were obtained after 10 h of retention time for systems 3+2 and 4+1 and, after 12 h for system 2+2. The best results were obtained for system 4+1 after 10 h. The wastewater treated in the batch reactor had the following characteristics: was 913 mg L-1, was 56.0 mg L-1, and was 33.0 mg L-1. The following results were obtained for treated wastewater (effluent): = 54 mg L-1, = 4.4 mg L-1, and < 1.2 mg L-1, respectively. The maximal values for specific substrate utilization and nitrification rate were obtained for system 4+1; was 0.406 h-1 and was 0.0182 h-1. Such batch tests are appropriate for fast determination of main treatment parameters in regard to existing wastewater treatment plants, where expansion is on programme.
Keywords
Batch reactor; municipal wastewater treatment; nitrogen removal; pig slurry
Hrčak ID:
21401
URI
Publication date:
28.3.2008.
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