Wastewater Sludge Reduction Case Study: 4-MGD MUD Achieves Major Cost Savings with Aqua Assist
Wastewater treatment plants dealing with high biosolids handling costs and chemical usage can reduce both without capital upgrades. In this case study, a 4-MGD municipal utility district (MUD) achieved 25–33% biosolids reduction, 32% less bleach usage, and lower polymer and labor costs using biological treatment over a 12-month period.
Not sure how much sludge is impacting your system?
Request a Technical Assessment
Overview
- 32% less bleach used for disinfection
- 33% reduction in biosolids
- Reduced polymer use and labor-hours for pressing sludge
The Challenge: Rising Biosolids and Operating Costs
A municipal utility district (MUD) in the Houston area was facing increasing operational costs driven by:
- High biosolids production requiring frequent hauling
- Rising polymer usage for sludge dewatering
- Labor-intensive sludge handling and pressing
- Chemical costs associated with disinfection
Like many wastewater treatment plants, the facility needed a way to improve performance without adding new infrastructure or increasing operational complexity.
System Overview
- Facility Type: Municipal wastewater treatment plant
- Capacity: 4 MGD
- Treatment Type: Aerated system with sludge dewatering
- Primary Challenges: Biosolids volume, chemical usage, and operational costs
The Solution: Biological Sludge Reduction with Aqua Assist
The facility implemented Aqua Assist, a biological treatment designed to accelerate the breakdown of organic solids within the system.
Unlike traditional approaches that rely solely on mechanical removal or chemical treatment, Aqua Assist works by enhancing microbial activity directly within the sludge layer—reducing solids at the source.
This allows facilities to:
- Reduce sludge accumulation over time
- Improve overall treatment efficiency
- Lower downstream chemical demand
Results: Measurable Reductions in Solids and Costs
After more than 12 months of continuous use, the facility achieved consistent and measurable improvements:
Key Results:
- 25–33% reduction in biosolids production
- 32% reduction in bleach usage for disinfection
- Reduced polymer consumption for sludge dewatering
- Decreased labor hours required for sludge pressing
- Lower monthly hauling and disposal costs
The reduction in biosolids directly decreased hauling frequency, while improved effluent quality reduced the need for chemical disinfection.
Facilities seeing similar sludge accumulation and rising costs can often achieve comparable results with the right biological strategy.
Talk to a Drylet Specialist
Why It Worked
The results were driven by improved biological activity within the treatment process.
By accelerating the breakdown of organic solids:
- Less sludge accumulated in the system
- Dewatering efficiency improved
- Effluent quality increased, reducing chemical demand
This approach targets the root cause of biosolids buildup rather than managing it after the fact.
Operational and Environmental Impact
Beyond cost savings, the facility also reduced its environmental footprint.
Lower biosolids production means:
- Less material sent to landfills
- Reduced methane generation during decomposition
- Lower overall greenhouse gas (GHG) impact
At the same time, reduced chemical usage improved operational safety and sustainability.
When This Approach Makes Sense
Biological sludge reduction is especially effective for facilities experiencing:
- Increasing sludge hauling costs
- High polymer or chemical usage
- Capacity limitations due to solids buildup
- Pressure to reduce operational expenses without capital upgrades
If sludge distribution within the system is unknown, facilities may benefit from first evaluating sludge levels and accumulation patterns.
Lagoon Sludge Depth Measurement
FAQ: Wastewater Sludge Reduction
How long does biological sludge reduction take?
Most facilities begin seeing measurable results within 30–90 days, with continued improvement over time.
Can this reduce chemical usage?
Yes. Improved effluent quality can reduce the need for disinfectants like bleach.
Does this replace sludge hauling completely?
Not always—but it significantly reduces the volume and frequency, lowering overall costs.
Get a Technical Assessment of Your System
If you're dealing with rising sludge volumes, chemical costs, or performance issues, Drylet can evaluate your system and recommend a tailored approach.
Request a Technical Assessment
Stay Ahead of Wastewater Performance Issues
Get operator-focused insights on sludge reduction, lagoon performance, and troubleshooting. Systems and Solids is Drylet's free monthly newsletter.