An In-Depth Investigation of Bioremediation and Biological Factors Involved in Reducing Sludge at a Municipal Wastewater Treatment Facility Lagoon System
Heather Jennings, PE, Sr. Project Engineer, Probiotic Solutions®
Abstract
AbstractIn this study, the operators of a municipal wastewater treatment facility with 4 lagoons had determined that their 2 primary lagoons—10-foot-deep, with 25-million-gallon holding capacity each—had reached sludge depths of 5–7 feet, putting the lagoons at risk of upset and seriously impacting the facility’s wastewater processing capacity.
A bioremediation plan was implemented that included the use of a biostimulant to support microbial reduction of the organic solids in the system. Sludge judging was performed for the 2 primary lagoons at baseline and at quarterly intervals over a one-year period to measure the impact of the bioremediation plan on sludge reduction. This was supplemented with ATP analysis to identify live biomass energy levels and DNA analysis to identify presence of and changes in relative representation of bacteria species at various stages of plan implementation. It also documented bacteria response to changes in influent due to episodic loading from industry, including a near-septic event. A modified sludge judge was used to collect samples from each of 3 layers of the lagoon: bottom (sludge), middle (interstitial), and top (supernatant).
The results of the ATP and DNA analyses pointed out the often-misunderstood fact that wastewater treatment facility lagoon sludge is not inert: it is the most biologically active layer of the water column and can be efficiently controlled and reduced through proper bioremediation interventions. The ATP analyses also documented the lasting effects (3 months) of an episodic toxic loading on the 2 lagoons. The study reports the 47 most abundant bacteria species present at various quarterly samples and at each of the 3 water/sludge layers. Discussion is provided of the roles several of these bacteria species play in the bioremediation process.
At the end of the one-year bioremediation plan, sludge depth for the 2 lagoons had been reduced by an average of 45%, with sludge depth at some sample points completely reduced to zero. This represented 17,800 dry tons of sludge that did not need to be mechanically removed and hauled to a disposal location, a potential savings to the treatment facility of over $6 million.
Complete the form below to download/read the complete white paper.
(32 pages, 34 figures, 37 tables)
Related Posts
Your Wastewater System Runs Smoothly, Until It Doesn’t!
By Heather Jennings, PE The first thing I usually hear from operators is that they don’t have any problems! Everything runs perfectly, all the time, until it doesn’t. Then the heartburn, extra hours, and long days begin. The only other thing as sure as death and taxes for a wastewater system is that it will
This Week in Ag #20
Wheat harvest is well underway throughout the country. Each morning, the harvest process begins with equipment maintenance. Most farmers and custom cutters will park their fleet in a row, or in close proximity, so they can readily perform daily service. This involves the grease gun. Combines have hundreds of moving parts. Some of the most key
This Week in Ag #64
My #Plant24 corn went in the ground on May 1, and it was up in just five days. We planted in ideal conditions: soil temperature was 76 degrees, and while the surface was dry, the seeds were placed two inches deep in moist soil. We’ve had nearly 1.5” of rain since. Preplant broadcast applications included our Supers
