The Sharon process for nitrogen removal in ammonium rich waste water
1997
Hellinga, C. | Loosdrecht, M.C.M. van | Heijnen, J.J. (Delft Univ. of Technology (Netherlands). Dept. of Biochemical Engineering)
The biological SHARON process has been developed at the Delft University of Technology for substantial ammonia removal in concentrated waste water flows such as reject water from sludge digesting units. The conversion takes place in a simple well mixed reactor at high temperature (30-40 degrees C) and pH (7-8). There is no need for sludge retention, due to the high growth rate of ammonium oxidisers under these conditions. The reactor is aerated intermittently to allow for denitrification, that is mainly introduced for pH control. A reduction in the ammonia content of 80-90 per cent is well feasible. Investment costs are low and variable costs are minimised by controlling the oxidation route via nitrite. The first full scale SHARON plant will be operational in the beginning of 1998. This contribution focuses on the principles of the process and on full scale process design.
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