Employer/ Beneficiary: Passavant-Roediger Anlagenbau GmbH – Germany/ Sofia Municipality by concessioner “Sofiyska voda” AD
Implementation period: 04/2003 – 11/2009

Design parameters:

• Anaerobic Sludge Stabilization Plant with Biogas Utilization with following parameters:
  – Anaerobic digesters – 4 pcs., each digester with a volume of 7 000 m³;
  – Amount of treated sludge – 1 680 ÷ 1 920 m³/d;
  – Amount of produced biogas – 27 000 ÷ 40 000 m³/d.
• Parameters WWTP – Kubratovo:
  – Capacity 1 300 000 PE
  – Wastewater quantity 484 000 m³/d.
• Performed activities:
  Site survey and inspection of existing facilities;
• Preparation of two-phase design by all design parts:
  – Preliminary Design;
  – Issuing a construction permit;
  – Detailed Design;
  – Coordination in accordance with the different phases of construction;
• Preparation of tender documents for the local civil works under FIDIC Conditions of Contract;
• Assistance in tendering and evaluation of offers; Construction supervision on site as FIDIC Engineer;
• Bill of quantities for construction and construction works;
• Supervision of site construction, such as FIDIC Engineer;
• Assistance in start-up procedures and commissioning;
• Preparation of us-built documentation, issuing a use permit (2009);

Investment value of the project: 4 602 000 € (without VAT)