Solving harvest season challenges, cutting treatment costs, and saving freshwater

BACKGROUND:
This plant averages 350 GPM influent flow, peaking to 600 GPM during crush. Water is sent to a DAF and then to secondary treatment, while float solids are pressed and hauled. The incumbent chemistry program included ACH / DADMAC + anionic / cationic PAM.
PROBLEM:
The plant’s KPI of ≤ 750 mg/ L TSS could not be met during harvest. The operations team routinely doubled polymer feed, yet DAF effluent still drifted past 1 000 mg /L. Daily chemistry spend increased from $850 to $1 ,700. High doses strained pump capacity, disrupted secondary treatment, and undermined cost targets just when production margins were tightest.
APPROACH:
We designed a program to address the challenges of harvest season and simplify things year round. Based on site conditions, we moved the flocculant injection point downstream to reduce shear, and integrated progressive cavity pumps with SCADA for consistent dosing to cut down on labor during peak season. These operational changes were paired with a new chemistry program:
RESULTS:
The new program consistently held DAF effluent between 600–700 mg/L TSS, even during peak harvest. Switching to SCADA-integrated pumps improved dose stability as flow rates shifted. Together, these changes cut manual adjustments and reduced chemical handling during the busiest weeks of the year.
CarboNet’s chemistry is now in full-time use, where site operators reported 20–25% reductions in treatment cost.
