Use of on-line data to evaluate the activity in the biological stage at a wastewater treatment plant

摘要

Today many WWTPs are equipped with different on-line instruments for automatic and manual control of the process. The use of computerised systems for data acquisition gives us new possibilities to evaluate collected data. This study shows the possibilities and potentials in using standard equipment, simple calculations and the biological stage as a measuring cell for activity determinations. Evaluation of data from Henriksdal and Bromma WWTP give some examples from the biological stage where activity can be calculated on-line. The calculation of Oxygen Uptake Rates, OUR, can be used in several ways: a) Estimation of the overall activity in the aerated part of biological stage. b) Calculations of the load of oxygen consuming substanses on the aerated basin. c) Calculation of nitrification rate. d) Estimation of necessary aerated volume. e) Rapid detection of inhibition of the nitrification land other oxygen consuming reactions). One advantage with these calculations is the fast response to changes. (C) 1998 IAWQ. Published by Elsevier Science Ltd. [References: 3]