Classic system (bio trickle-bed reactor):
Never. SH SULPHTEC systems do not get clogged. The CLASSIC system type has a fully automatic cleaning system integrated in the reactor as standard. This system operates permanently. In addition, the system prevents the elemental sulphur contained in the suspension from constantly trickling back over the packing.
This ensures almost 100% uptime (364 days per year; 1 day is required for annual maintenance).

SulphPur® system (bio fluidized-bed reactor):
Never. With SulphPur® systems, clogging is technically impossible since the SulphPur® system does not use conventional fillers.

The elementary sulphur falls directly into the container sump and circles out from there.

Classic system:
This depends on the H2S content. About every four to five years. Duration: one day.

SulphPur® system:
Never, or only with very high H2S loads. However, we recommend annual maintenance. Our trained service personnel can then advise you whether the system requires cleaning.

Yes, SH SULPHTEC guarantees that the system will not get clogged, provided the design parameters are observed. In case the system does get clogged, we will clean it free of charge and, if necessary, replace the packing at no cost to the customer.

(The necessary oxygen is supplied to the biogas in the SH Sulphtec desulphurisation system)

Classic system:
2 v % min. Oxygen as a function of the H2S content.
With 2 v % O2, each bio trickle-bed reactor produces approx. 80% of sulphate and approx. 20% of elemental sulphur.
The less oxygen is contained in the gas, the more elemental sulphur is formed.
When the oxygen content reaches 0.5%, the ratio of sulphate to elemental sulphur reverses. The system then produces only approx. 20% sulphate and approx. 80% elemental sulphur. A bio trickle-bed reactor would clog.

SulphPur® system:
0.3-0.5 v % Oxygen as a function of the H2S content.
Since the SulphPur system cannot technically clog, it does not matter how much elemental sulphur is formed.
In addition, the low oxygen requirement offers a significant advantage for biomethane processing, since the oxygen content in the clean gas after desulphurization is only 0.1-0.3%.

Both Classic and SulphPur® systems are equipped with Siemens or WAGO controls as standard. Touch screen operation is standard with these systems. On request (depending on display size), the system components can also be controlled visually.

SH SULPHTEC systems do not require any additional personnel, as all processes are fully automatic. Occasional visual checks are recommended, however.
Nutrient reservoirs can be individually designed with capacities of up to three months.

Classic system:
Three to four days after commissioning, the Classic system already achieves up to 100% of the required degradation capacity.
In biogas plants with a high NH3 content, the start-up phase can take 1-2 days longer depending on the outside temperature.

SulphPur® system:
The SulphPur® system reaches its maximum degradation capacity after three to four days.

Both Classic and SulphPur® systems can be custom-designed. Overall heights and diameters are adapted to local conditions. Gas inlets and outlets can be designed according to local conditions in order to ensure pipelines are designed in an optimal, cost-effective way.

If necessary, height restriction issues can be avoided by using a Classic CUBE system. (see:

A SulphPur® system requires up to 95% less water than a comparable bio trickle-bed reactor.
This offers the advantage of much cheaper waste water transport.

All required signals can be passed on to the higher-level control system. Profibus, Profinet or special customer specifications are available as an option.

Advantages of a SH SULPHTEC desulphurisation system:


  • Very reliable degradation of high to very high H2S loads.
  • An always-on, fully automatic packing cleaning system ensures high availability. (No clogging by elemental sulphur)
  • Only one regular maintenance per year is necessary. 364 days per year availability.
  • 5-year guarantee against clogging (provided the design parameters are adhered to)


  • Very reliable degradation of high to very high H2S loads.
  • Only 0.3-0.5% of oxygen required. (Important for biomethane systems)
  • Up to 90% less water consumption than a bio trickle-bed reactor. This is a considerable advantage in the case of high wastewater transport costs.
  • Lifetime guarantee against clogging.