| Project type: | Biogas Plant |
| Place: | Kirchhain, Hessen, Germany |
| Operator: | EAM Natur GmbH, Maibachstraße 7, D-35683 Dillenburg |
| Capacity: | 0.000 tpa of source separated organics + 15.000 tpa of renewable resources |
| Focus: | Production of 3 Mio. m³ biogas and compost |
ACCOUNT
Until 2012 E.ON Mitte AG, headquartered in Kassel, was a regional energy supplier majority-owned by E.ON Energie AG. In large parts of Hesse, Southern Lower Saxony, West Thuringia and East Westphalia E.ON Mitte AG operated the electricity and natural gas network. In 2010 E.ON Mitte Natur GmbH, a subsidiary of E.ON Mitte AG intended to extent the existing composting plant in Kirchhain-Stausebach.
CONDITIONS
It was intended to extend the plant in Kirchhain-Stausebach from a throughput capacity of 8,000 tpa when processing source separated organics (SSO) to an AD plant with a downstream composting facility and a processing capacity of 25,000 tpa of SSO plus in addition 5,000 tpa other organic wastes. It was also intended to build an AD plant for 15,000 tpa of renewable resources in conjunction with a biogas treatment plant (approx. 700 Nm³/h) processing the biogas of both plants.
Via a newly to build gas compressor and feed station of E.ON Mitte AG the processed gas (approx. 350 Nm³ / h) should than be injected into the gas grid and supplied to the end users.
IMPLEMENTATION
Waste Tec GmbH did convince the client with the concept for
- SSO fermentation with downstream composting,
- wet fermentation of renewable resources
- and gas processing.
Waste Tec was commissioned with the concept development, the general planning as well as with the construction supervision and project management.
In addition, Waste Tec GmbH got the order by E.ON Mitte Natur GmbH for the design, supply and commissioning of two composting tunnels.
CONCEPT DEVELOPMENT, GENERAL PLANNING AND CONSTRUCTION SUPERVISION
The objective for the concept development was production of biogas from the 30,000 tpa of source separated organics and the economical injection of the processed biogas into the gas grid of E.ON. As an economic injection could not be achieved of the SSO based gas production an AD plant for renewable resources was integrated into the overall concept.
Based on the footprint of the existing property (excisting composting plant and additional plot of land) a plant layout was developed by Waste Tec. In the next steps a tender for the design, supply and commissioning of an AD plant for renewable resources, source separated organics, composting of digestate, incl. exhaust air purification and biogas processing was prepared by Waste Tec.
After the successfully finished tender process Waste Tec was appointed by E.ON to carry out the construction supervision until final take over. The planning and subsequent realization of the gas injection system was mainly the responsibility of E.ON Mitte Natur and therefore was not part of the planning services provided by Waste Tec. Waste Tec did remain responsible for the space planning and interface coordination for the biogas processing system.
CONSTRUCTION OF TWO COMPOSTING TUNNELS
The type of composting process to be used for the digestate was developed in conjunction with the conceptual development and subsequent concretion of the plant design. It was defined that the composting process should be completely enclosed and exhaust air captured. Waste Tec got the order for two composting tunnels (inner dimensions length 32,00 m x width 6,20 m x height 5,00m) including a PLC operated ventilation system.
The composting tunnels are operated with a mixture in the majority consisting of digestate and to a lesser content of fresh SSO. Normally the retention time is 7 days. The low odour compost is matured in a sheltered area to finished compost.
Biowaste mixing area
Biogas plant
Ventilationsystem biodrying
Biofilter
Maturation area
