Anaerobic biological treatment

Turn wastewater and/or waste into power

Anaerobic treatment systems are based on a biological process operated and controlled under anaerobic conditions that effectively treats COD, BOD and VSS while producing biogas and very little biomass (without oxygen). Nijhuis anaerobic treatment experts have vast experience and knowhow to properly select, design, build and operate anaerobic processes providing clients with the best treatment solution.

Our award winning sustainable anaerobic AECOMIXTM solutions come in a variety of proven options, allowing Nijhuis to offer the best application. Whether you are interested in turning your (waste)water into a power plant, need to reduce industrial wastewater pollutant load to meet surcharge requirements or treat industrial wastewater for water recycling, Nijhuis can incorporate the proper AECOMIXTM technical approach, offering ECOlogical and ECOnomic benefits. AECOMIXTM technologies are applied to a MIXture of substances in wastewater and/or organic wastes.

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  • IMGP9254

The Nijhuis AECOMIXTM-TAURUS reactor system is a complete mixed anaerobic reactor suitable for all types of waste, manure, sludge and renewable energy crops. Under anaerobic circumstances, wastes and organic substances are digested into biogas and digestate. Additionally, a robust separation step such as a decanter centrifuge or screw press can be applied to separate the digestate into a liquid and solid fraction.

For efficient centrate water / digestate treatment, the Nijhuis AECO-NAR allows to threat the liquid fraction to accept challenging co-substrates in the digester, avoiding toxicity in the digester, increase biogas yield, reduce discharge costs ánd recover ammonia into fertilizer. Especially for manure applications, the complete manure treatment solution Nijhuis GENIUS turns manure into green minerals and clean water which consist of modular selectable technologies such as AECOMIXTM-TAURUS, decanter, dissolved air flotation, AECO-NAR and UF/RO.

The anaerobic reactor technology, which is one of the simplest systems with all the anaerobic benefits, fits into any available tank on the market and produces biogas. The AECOMIXTM-AnMBBR is a compact anaerobic carrier technology for greenfield and expansion purposes. The innovative technology setup will reduce the pre-treatment requirement, resulting in a higher biogas yield.

The award winning AECOMIXTM-DGF system is a revolutionary and highly innovative solution, especially tailored for food and beverage plants to effectively treat raw wastewaters that contain high TSS and FOG concentrations. Additional benefits can be realized when the plant also digests factory wastes.

The technology provides a simple and robust anaerobic solution for many substrates and a high COD removal efficiency of more than 95%. The Nijhuis AECOMIXTM-DGF is a perfect solution to deal with factory effluent together with organic wastes without the need of a (chemical) pre-treatment.

High-rate anaerobic technology offers high COD and BOD wastewater removals in a highly loaded anaerobic system, based on a granular sludge process, with minimized footprint. Nijhuis AECOMIXTM-EGSB/UASB/IR includes a simple and efficient internal piping design and improved granular sludge retention offering a more compact, robust treatment system. A pretreatment system will protect and greatly improve the robustness of highrate anaerobic treatment technology.

  • Digester-tank


  • (Craft)Breweries, distilleries and wineries
  • Soft drink, liquid food, coffee and beverage producers
  • Convenience and food processing
  • Potato and crisps processing
  • Milk and liquid milk processing
  • Edible oil processing
  • Fish, meat and poultry processing
  • Agricultural waste, manure and digestate and biogas processing

Customer Benefits

  1. Turn a (waste)water treatment plant into a power generator
  2. Reduce operational costs
  3. High removal rates of BOD and VSS greatly reducing surcharge costs
  4. Highly adaptable to local requirements and conditions
  5. Reduced overall sludge production cost