ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 546

NOTE: Day 1 refers to the day that the aeration tank is full. If dry seed was used this will
be day 7. If nitrifying bacteria were provided begin dosing into the aeration tank
according to the schedule in below.
Flux and nitrifying bacteria dosing schedule
4. Foaming may occur during start-up, which is normal. Foaming can be caused by a number
of factors. Typically during start-up foaming is a result of a high food (BOD) to
microorganism (F/M) ratio. This promotes the growth of long chained filamentous bacteria
that increases the surface tension resulting in strong, long lasting foam. As the quantity of
biomass builds, and the sludge age increases the normal non-filamentous bacteria will
dominate, and the foam should subside. In the meantime foaming can be addressed by
spraying water, food based defoamer (silicone based defoamer is strictly prohibited)
addition, or aeration minimization in the aeration tank. Check for signs of toxicity and
excessive fat, oil and grease.
5. If a defoamer is required, consult with a process engineer for recommendation of an
acceptable antifoaming agent and dosing quantities.
newterra O&M Manual
© 2017 by newterra, ltd.
All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without prior written permission of newterra ltd.
Day Flux (lmh)
1 6.5
2 6.9
3 7.4
4 7.9
5 8.4
6 9.0
7 9.6
8 10.2
9 10.9
10 11.6
11 12.4
12 13.2
13 14.1
14 15.1
15 16.1
16 17.1
17 18.0
18 18.0
19 18.0
20 18.0
21 18.0
22 18.0
23 18.0
1291 California Avenue, Brockville, ON K6V 5W3
(800) 420-4056 / www.newterra.com
Nitrifying
Bacteria to be
Added (% of
Total Provided)
[If Provided]
20%
20%
20%
20%
20%
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
newterra ltd.
79