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Solar Biosolids Drying Systems

Design. Supply. Integrated Delivery.
One Water Technologies provides turnkey solar sludge drying systems using Wendewolf® mechanical turning technology and U.S.-manufactured Agratech engineered greenhouse structures. Systems can be purchased as capital equipment or delivered as a service with payments over time.

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The Challenge Facing Utilities

Biosolids management costs continue to rise due to:

  • Increasing hauling and disposal rates
  • Pressure to produce Class A biosolids
  • Carbon reduction and fossil fuel reduction goals
  • High labor costs
  • Limited space or competing land uses at the plant
Solar drying directly addresses these issues.

Typical benefits include:

  • Up to 70% reduction in hauling and disposal volume
  • Long service life (25+ years)
  • Automated turning and conveying
  • Capable of producing Class A biosolids under 40 CFR Part 503
This is proven mechanical and greenhouse-based drying technology deployed worldwide.

How the System Works

01

Dewatered cake (typically 18–22% dry solids) is placed at the inlet end of the greenhouse.

02

The Wendewolf tilling drum turns, aerates, and slowly conveys the material down the hall.

03

Solar radiation drives evaporation through high-transmission roof panels.

04

Internal air circulation fans and roof ventilation remove saturated air.

05

Dried product exits at 70–90% dry solids. Systems can be designed to meet your specific dryness target.
The process is continuous and automated. Operators place wet cake at one end and remove dried product at the other.

Core Components

Wendewolf Mechanical Turning System

  • Heavy-duty drum with engineered paddles
  • Automated forward and reverse travel
  • Sidewall-supported drive system
  • Low energy consumption (approximately 20 kWh per ton of water evaporated)

Agratech Engineered Greenhouse Structure

  • U.S.-manufactured steel framing
  • Designed for snow, wind, and seismic loads per U.S. codes
  • Roof light transmission ≥ 80%
  • Sidewall transmission ≥ 60%
  • Polycarbonate, ETFE, or engineered polyethylene options

Integrated Controls & Ventilation

  • Climate-responsive operation
  • Gravitational or mechanical ventilation options
  • Continuous air circulation to remove saturated air boundary layer
  • Motorized roof louvers and sliding gates

Delivery Models 

  • Traditional design-bid-build
  • Design-build
  • Service agreement with fixed annual payment
  • No upfront capital option available

We can coordinate with your trusted engineer as part of the project team.

Annual payments can be  structured below current hauling and operating costs.

Call Us:  1-216-710-6514

Email Us: sales@one-water-tech.com

Location: Cleveland, Ohio

One Water Technologies delivers municipal solutions guided by decades of industry experience. We help our clients implement reliable and high quality solutions with great field support.