At EBS, we understand that the primary concern in preparing for a major storm is the safety and wellbeing of the employees and community members of the mills in the projected path. However, we also understand that business must resume as quickly as possible to provide not only a sense of normalcy to those in the community, but to the many customers depending on your quality products and supply reliability.
In this article, we have provided conceptual ideas and recommendations on how to prepare an ASB to resume treatment of normal effluent loading from the mill. There are a number of parameters to consider when developing a re-start plan for any WWTP, whether it is an ASB or activated sludge system. System volume and retention time, degree of biomass loss, and duration of time without air or food, are some of the key factors that must be addressed when deciding when to start adding bacteria, nutrients, and supplemental food, as well as determining the need for bringing in sludge from a neighboring plant to provide additional mass for activated sludge systems. We understand that each mill situation is unique, and can assist you in customizing a plan to get your system back in shape quickly and cost effectively.
Recommended to have on site:
- Bacteria blend – at least 1 pallet
- Full tank of nutrient
- BAC Unit
Other products available if situations require them:
- EBS MicroCarb – alternative food source for growing (or keeping alive) bacteria in the treatment system.
- EBS CN-9 – alternative oxygen source for insufficient aeration scenarios.
Using the approach and materials described in the accompanying flow chart, EBS has successfully restarted three ASB systems in the past five years after outage periods ranging from one to six months, in addition to supporting dozens of mills during and after routine production outages ranging from a few days to several weeks. Recovery assistance and upset support are always top priorities for EBS. We are making representatives available for the foreseeable future for increased coverage in Irma’s projected path. If your mill needs assistance, please let us know so that we can make arrangements to help as early as possible.
Example ASB Re-Start Plan
Actual Details may vary based on length of time mill is down, system retention time, and difficulties encountered during start up. This plan assumes aeration has resumed and significant biomass washout has occurred.
Monitoring – Be sure to monitor the biomass with microscopic checks at key sampling points on a daily basis. Monitoring other key parameters, such as nutrient residuals (0.1 – 0.3 mg/L), DO (>1.0 mg/L), pH, temperature, BOD, and COD on a daily basis is critical as well.