Laddonia, MO is in the process of figuring out how to comply with their new NPDES permit issued by the Missouri DNR. While the original thought was to switch from a continuous discharge lagoon to a land application system, there were some concerns with land availability and potentially not being able to land apply during rainy seasons. In an effort to find an alternative that will not break the bank, one of Laddonia’s Council Members contacted WCS to request more information. After working with Laddonia to provide a preliminary design, WCS agreed to deliver a Mobile Pilot Unit to Laddonia for onsite testing of the Bio-Domes.

Solution & Results

The pilot unit was delivered to Laddonia in January of 2013 and started up during the dead of winter. In addition to a cold start, WCS was asked to reproduce the effects of having a significant sludge blanket in the pilot unit and as such the initial fill of the pilot tank contained a large amount of bottom sediments. The pilot unit took 3 weeks to develop a robust bio-film during which the sediments were being consumed in the Bio-Dome as evidenced by an effluent value higher than the influent. After the third week of operation however the bio-film established itself very robustly and the effluent ammonia hasn’t exceeded 0.3 mg/L since. Below is a chart of the ammonia data collected to date.


Customer Feedback

When asked for his opinion on the pilot study to date, Mark had this to say: “The pilot unit appears to be functioning well. It took about 3 weeks in cold weather to establish a biomass to treat and remove ammonia. I have been happy with the ability of the bi-dome unit to remove ammonia even at short hydraulic retention times.”