Clients

Kevin Martin

Category:

Web & App Developement

Date:

20 August, 2021

DEMOS

Demo Plant 1

DEMO 1, located in Thiva,Viotia, Region (Greece), is connected to an existing anaerobic digestion plant with a capacity of 480 kW. This plant utilizes agricultural residues from various cultivations and manure as feedstock, employing a sustainable approach to energy production.

The first step in the process involves the mechanical separation of the entire digestate using a cost-effective screw press. This method boasts lower capital and operational expenses, as well as reduced energy consumption (0.2-0.6 kWh/m3) in contrast to more energy-intensive solid/liquid separation methods, such as decanters and belt filter presses.

The liquid fraction, enriched with ammoniacal nitrogen, undergoes further processing using a LOW-TEMPERATURE EVAPORATOR patented prototype separating system developed by MADISI (WO2010/045892 A1).

This innovative system efficiently separates the liquid digestate into two distinct fraction:

(a) a nutrient-rich solid product and

(b) high-quality water suitable for reuse and irrigation

Remarkably, the energy requirements of this system are less than 1 kWh/m3 of liquid digestate, significantly lower (8 to 25 times) than existing evaporation systems.

To minimize environmental impact, an ammonia scrubbing system, specifically tailored for this application, is incorporated into the prototype evaporator’s gas emission stream. This system not only reduces environmental harm but also produces a high-quality inorganic nitrogen fertilizer.

The solid fraction of the digestate undergoes composting, producing a nitrogen, phosphorous, and potassium-rich organic fertilizer.

The DEMO 1 system is designed to treat an average of 50 tons per day of raw digestate, yielding compost (3 tons per day), solid organic fertilizer (2 tons per day), (NH4)2SO4 (490 kg per day), and process water (38 m3 per day).

This comprehensive and sustainable approach to digestate valorization demonstrates a commitment to environmental responsibility and resource optimization.

Clients

Kevin Martin

Category:

Web & App Developement

Date:

20 August, 2021

DEMO 1 Key components

The main process units include:
  • Objective: Mechanical separation of the entire digestate from anaerobic digestion into liquid and solid fractions.
  • Objective: Further processing of the liquid fraction rich in ammoniacal nitrogen using a novel and patented evaporator system designed by MADISI (WO2010/045892 A1).
  • Process: The evaporator exposes the liquid digestate fraction to specific thermodynamic conditions, facilitating phase change (low temperature, pressure). This process results in the separation of nutrient-rich solid and process water with low energy consumption (<1 kWh/m3).
  • Prototype will be designed, manufactured, and installed by MADISI, ensuring operational readiness for DEMO 1.
  • Objective: Integration into the evaporator’s gas emission stream for environmental impact mitigation and production of ammonium sulfate (NH4)2SO4, an inorganic, high-quality nitrogen fertilizer.
  • Tailored to the specific requirements of LIFE DIMITRA DEMO 1, designed by NTUA, and manufactured by KAFSIS.
  • Objective: Composting of the solid fraction of digestate to produce nitrogen, phosphorous, and potassium-rich solid organic fertilizer.
  • Adheres to windrow composting principles, leveraging NTUA’s extensive composting experience and utilizing existing infrastructure from the KAFSIS AD plant.
  • Objective: Design and installation of a supervisory control and data acquisition (SCADA) system by NTUA for real-time monitoring and control of DEMO plant operations.
  • SCADA translates raw system data into Key Performance Indicators (KPI) to ensure optimal performance and efficiency.

The successful implementation of these components will contribute to a sustainable and efficient valorization process, aligning with the objectives of LIFE DIMITRA. The engineering design will be meticulous, ensuring timely construction and installation of all necessary equipment.