- Terratec Environmental Ltd
 - Biosolids recycling specialists, with long-term regional programmes, field application technology, agronomic advisory services, and lagoon and digester cleaning. - N-Viro International
- Provides recycling technologies to convert wastewater sludge and other organic and mineral byproducts into soil fertility products.
- AKT International
- Offers organic waste recycling, solutions in the recovery of proteins, oils, and nutrients from waste streams, and dehydrator and feed meal production systems.
- Trooper Technologies Inc.
- Builds rendering plants and thermophilic fermentation plants which recycle organic waste.
- Land Resource Recycling Management, Inc.
- Specialises in the reuse of sewage biosolids and food processing wastes as fertilizer replacement/supplements for farming. Offices in Pennsylvania and New Jersey.
 Lammas Resources Limited
- Specialises in bio-recycling of organic residues and effluents into reusable products using environmentally benign processes.- Harmony Environmental, Inc.
- Service company which specilizes in the recycling of grease trap by-products. Also recycles fryalator oils.
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