Solution: Design of wastewater treatment facilities

• Customized consulting and proposed solutions for a wide variety of challenges, taking other infrastructure into account
• Development of wastewater disposal concepts
• Preparation of wastewater disposal projects for submission, including participation in negotiations with authorities
• Processing of grant applications
• Detailed design
• Tendering and participation in the awarding of contracts
• Overall supervision during the construction phase and on-site construction supervision
• Preparation of documentation for the final water law review, including participation in the review hearing
• Preparation of documentation for the technical acceptance inspection (funding), including participation in the acceptance inspection hearing

Operation of Small-Scale Wastewater Treatment Plants

To ensure that a small wastewater treatment plant is operated in compliance with regulations and the law, the following points must generally be taken into account:

• The plant operator must perform weekly/monthly operational checks and maintain an operational logbook.
• If the operator does not have their own qualified wastewater treatment personnel available for annual maintenance of the system, a maintenance contract must be concluded with an authorized specialist company.
• In the case of third-party monitoring, the system’s functionality and treatment performance must be verified once a year under increased load (this is usually carried out by the same company as part of the maintenance contract).
• Proper disposal of sewage sludge, including documentation.
• The system must be inspected by a qualified expert at least every 5 years in accordance with § 134 WRG 1959, as amended. A report on the findings must be submitted to the competent authority (online) without being requested.

Normative basis and applicable regulations:

• ÖNORM B 2502-1: Small-scale wastewater treatment plants (domestic wastewater treatment plants) for systems up to 50 population equivalents (PE) – On-site constructed systems – Application, design, construction, and operation
• ÖNORM B 2505: Sewage treatment plants – Intermittently fed soil filters (“plant-based sewage treatment plants”) – Application, design, construction, operation, maintenance, and inspection
• ÖNORM B 2508: Wastewater treatment plants – Small wastewater treatment plants for 51 to 500 population equivalents – Supplementary provisions to ÖNORM EN 12255 (all parts) for design, construction, testing, and operation
• Regulation of the Federal Minister of Agriculture and Forestry on the General Limitation of Wastewater Discharges into Watercourses and Public Sewer Systems (General Wastewater Discharge Regulation – AAEV)
• Water Rights Act (WRG 1959, as amended)