Water Science and Technology Vol 33 No 1 pp 311323 © IWA Publishing 1996
Respirometry for determination of the influents SS-concentration
A. Witteborg*, A. van der Last**, R. Hamming* and I. Hemmers*
*Vertis bv, P.O. Box 73 9640 AB Veendam The Netherlands
**AVEBE Process Research, P.O. Box 15 9640 AA Veedam The Netherlands
A method is presented for determining influent readily biodegradable substrate concentration (SS). The method is based on three different respiration rates, which can be measured with a continuous respiration meter which is operated in a cyclic way. Within the respiration meter nitrification is inhibited through the addition of ATU. Simulations were used to develop the respirometry set-up and decide upon the experimental design. The method was tested as part of a large measurement programme executed at a full-scale plant.
The proposed respirometry set-up has been shown to be suitable for a semi-on-line determination of an influent SS which is fully based on the IAWQ #1 vision of the activated sludge process. The YH and the KS play a major role in the principle, and should be measured directly from the process.
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