Anaerobic Digestion Unit


Anaerobic Digestion is simply the controlled breakdown of organic matter without air, used to manage waste and/or to release energy. It is a biological process that produces an energy-rich biogas, principally composed of methane (CH4) and carbon dioxide (CO2), which can be used as a fuel.

CleanWorld’s Commitment to R&D
Anaerobic digestion is an ever-evolving technology. The CleanWorld R&D team continuously strives to develop innovative processes and technologies to improve biogas system efficiency, stability, and usability. The following are examples of some of our R&D efforts:

  • Improved process modeling
  • Dynamic modeling of anaerobic digestion systems
  • Prototype development
  • Pilot-scale digester operation for feedstock evaluation and process enhancement
  • Testing and design of pre- and post-processing equipment
  • Testing of advanced biogas-energy conversion technologies

The benefits of Anaerobic Digestion are:

  • Captures 100% of the harmful greenhouse gas emissions from organic waste
  • Reduces odor
  • Produces renewable energy
  • Produces nutrient rich compost and other valuable soil amendments
  • Processes concentrated liquid waste to significantly reduce BOD
  • Diverts waste from landfills

CleanWorld’s BioDigester is a thermophilic, high-rate, high-solid digestion system, with a three-stage design. It is especially engineered with food waste in mind, including agricultural residues, commercial food processing waste, and restaurant and supermarket food scraps.


High-solids: CleanWorld’s BioDigesters efficiently digest a high-solid waste stream (up to 50% solids) without requiring substantial preprocessing and with minimal added water. The system can handle de-packaging and sorting, so organic waste streams that include cans, bottles, plastic-wrapped foods, and other contaminants can be used.

High-rate: CleanWorld’s proprietary high-rate digester design uses continuous—rather than batch—processing, allowing for rapid waste throughput. This technology has a higher organic loading rate, shorter hydraulic feedstock retention time (approximately 20 days), and a longer solids retention time to maximize bacterial populations and solids digestion in the system. High-rate processing reduces retention times by up to 50% over other systems, which means smaller tanks, a smaller system footprint, and lower site costs, allowing for economical applications in a wide range of industries.

Three-stage processing: By dividing the anaerobic digestion process into three stages, CleanWorld’s BioDigesters provide the optimum environment for the bacteria used in each stage of processing. This means more complete digestion of waste, resulting in higher energy production and greater carbon reductions compared with single stage digesters

Thermophilic: CleanWorld’s AD systems operate at thermophilic temperatures (122-140º F), in contrast to most AD systems, which operate at mesophilic temperatures (86-104° F). Operating at higher temperatures results in faster processing and reduces the size of the digester required. In addition, it destroys pathogens in the waste, making the residual materials safe for use as compost and organic soil amendment products.

Energy usage: The low parasitic load of CleanWorld BioDigesters increases system energy efficiency in comparison with traditional power-hungry, high-liquid AD systems. The tanks and pipes are well insulated to minimize heat loss. In most cases, our digesters only require a small fraction of the heat and electricity produced to support the digester’s parasitic load. 

Construction: CleanWorld’s AD design combines the use of low-cost manufacturing and assembly techniques with a standardized, modular design that makes possible economically viable AD systems. Simplified assembly, reduction of labor, and the elimination of complicated on-site construction minimize up-front costs and speed construction. A CleanWorld BioDigester can be operational in as little as four to six months. The modular design also improves serviceability and enables easy scale-up when waste processing needs increase.

Monitoring: Advanced instrumentation and control systems allow remote monitoring and control of the digester by PC, tablet, or smartphone, improving operational efficiency while reducing staffing needs and operating costs. The system provides real-time data trending; historical data is collected as well and analyzed to produce reports for monitoring system performance and detecting trends.

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