Start-up of anaerobic fixed film reactors: Technical aspects

• Published in: Water Science & Technology Vol. 20; no. 10-11; pp. 297 - 308
• Main Authors: Austermann-Haun, U, Seyfried, C F, Zellner, G, Diekmann, H
• Format: Conference Proceeding
• Language: English
• Published: 01.01.1994
• ISSN: 0273-1223

For two years lab-scale experiments were done to find the conditions to enhance the start-up of anaerobic fixed film reactors. Five reactors were operated in parallel with a synthetic wastewater containing acetic, propionic and butyric acid in a weight relation of 2:1:1 resulting in a COD of 20,000 mg/l. Using polypropylene curlers (NOR-PAC R 92/1) as support medium (substratum) and mostly digested sludge of a municipal wastewater treatment plant as inoculum, we found that the activity of the starter culture, effluent recirculation, calcium dosage and the mode of increasing the organic loading rate had a significant influence on start-up behaviour. Depending on the way to run the start-up space loading rates of 10 to 30 g COD/(1 x d)could be reached within 58 days. In contrast to these "manual" start-ups it is shown that the most efficient way is to run a start-up pH-statistically with an automatic substrate feeding regulated by the pH measured in the top of the reactor. Within 36 days a space loading rate of 60 g COD/(1 x d) with a COD removal efficiency of 70% could be reached.