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Use of the upflow sludge blanket (USB) reactor concept for biological wastewater treatment, especially for anaerobic treatment
Author(s) -
Lettinga G.,
van Velsen A. F. M.,
Hobma S. W.,
de Zeeuw W.,
Klapwijk A.
Publication year - 1980
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260220402
Subject(s) - denitrification , chemical oxygen demand , wastewater , environmental science , hydraulic retention time , blanket , sewage treatment , pilot plant , waste management , anaerobic respiration , anaerobic exercise , activated sludge , anaerobic digestion , pulp and paper industry , environmental engineering , chemistry , nitrogen , engineering , materials science , methane , biology , physiology , organic chemistry , composite material
In recent years considerable effort has been made in the Netherlands toward the development of a more sophisticated anaerobic treatment process, suitable for treating low a strength wastes and for applications at liquid detention times of 3–4 hr. The efforts have resulted in new type of upflow anaerobic sludge blanket (UASB) process, which in recent 6 m 3 pilot‐plant experiments has shown to be capable of handling organic space loads of 15–40 kg chemical oxygen demand (COD)·m −3 /day at 3–8 hr liquid detention times. In the first 200 m 3 full‐scale plant of the UASB concept, organic space loadings of up to 16 kg COD·m −3 /day could be treated satisfactorily at a detention times of 4 hr, using sugar beet waste as feed. The main results obtained with the process in the laboratory as well as in 6 m 3 pilot plant and 200 m 3 full‐scale experiments are presented and evaluated in this paper. Special attention is given to the main operating characteristics of the UASB reactor concept. Moreover, some preliminary results are presented of laboratory experiments concerning the use of the USB reactor concept for denitrification as well as for the acid formation step in anaerobic treatment. For both purposes the process looks feasible because very satisfactory results with respect to denitrification and acid formation can be achieved at very high hydraulic loads (12 day −1 ) and high organic loading rates, i.e., 20 kg COD·m −3 /day in the denitrification and 60–80 kg COD·m −3 /day in the acid formation experiments.