Higher gas yield and efficient use of substrates – these are the advantages offered to biogas plant operators using NETZSCH’s NEMO® B.Max® mixing pump. As the core element of a biogas plant, substrate feeding is decisive in terms of achieving a biologically stable methane production process. The NEMO® B.Max® mixing pump is setting new standards with its maximum homogenisation and continuous pressure-stable, smooth and low-pulsation conveyance of biosubstrates – and all this with a high commitment to customer friendliness and maintainability too.

The NEMO® B.Max® progressing cavity pump made by NETZSCH presents itself as the feeding technology which is perfectly tailored to biogas applications. Solids from the dosing unit are mixed with recirculated substances in the mixing pump. The homogeneous mixture with a dry matter content of up to 25% is then conveyed to the fermenter. The NEMO® B.Max® provides twofold assurance of optimum product feed into the conveying chamber: its pump housing is fitted with a large, rectangular feed hopper and removable, conically shaped compression chamber, as well as a coupling rod with patented, horizontally positioned conveying screw. This conveys quantities of up to 75 m3/h at pressures of up to 48 bar. Ideal feeding and mixing of the substrates into the biomass are ensured by the spiral lobes of the mixing and screw conveyor, which have been strengthened and offset. This not only prevents bridging, but also leads to optimum mixing of the liquid phase and dry substrate in the hopper chamber. At the same time, the feed tube, installed on the hopper housing contra to the flow direction of the pump, also ensures improved substrate mixing – which means a higher gas yield as well.

NETZSCH designers have achieved compact dimensioning, low overall weight and constant shaft height, irrespective of the design and size of the drive, by flanging the drive directly to the pump’s lantern. The system can be flexibly adjusted to the dosage unit in each case through the various hopper lengths on offer. Numerous inspection openings in the hopper and compression chamber of the NEMO® B.Max® make it easier for operators to carry out inspection and maintenance. In the event of the pipework getting clogged up, the NETZSCH mixing pump has no problem flushing this out with a pressure of up to 12 bar, as the NEMO® B.Max®, with its two-stage construction, is also designed for high back pressures. The speed can be adjusted on the NEMO® B.Max® using a frequency inverter. This means the system can be flexibly adjusted to suit various raw materials, the mix ratio of the substrate and feed times.

The NEMO® B.Max® is particularly well suited to fermented, renewable raw materials, macerated biological waste, food waste and sugar beet, co-substrates, whole plant, maize and grass silage, solid manure, dry chicken manure and liquid manure.

[3.030 Zeichen inkl. Leerzeichen]

For more than 60 years, NETZSCH Pumps & Systems has served markets worldwide with NEMO® progressing cavity pumps, TORNADO® rotary lobe pumps, NOTOS® screw pumps, grinding machines, barrel emptying systems, dosing systems and accessories, providing customised, sophisticated solutions for applications in every type of industry. With a workforce of over 2,000 and a turnover of more than 245 million euros (2016 financial year), NETZSCH Pumps & Systems is the largest business unit with the highest turnover in the NETZSCH Group, alongside NETZSCH Analysing & Testing and NETZSCH Grinding & Dispersing.


NETZSCH Pumpen & Systeme GmbH

Geretsrieder Strasse 1

84478 Waldkraiburg


Phone: +49 8638 63-0

Fax: +49 8638 63-67981


Author: Michael Groth, Head of Global Business Field Environmental & Energy




The NEMO® B.Max® mixing pump guarantees continuous, pressure-stable, smooth and low-pulsation conveyance of biosubstrates to feed biogas plants.



The long screw system means that the NEMO® B.Max® mixing pump achieves optimum substrate mixing.



To protect it against corrosion, the NEMO® B.Max® mixing pump is available as an option in stainless steel or with coatings.




Numerous inspection openings in the hopper and the compression chamber of the pump facilitate maintenance of the NEMO® B.Max®.



Michael Groth, Head of Global Business Field Environmental & Energy



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