Official water-inspection certification of the expanded sewage treatment plant Handewitt
On December 16, 2019, the water-inspection certification took place in the presence of the technical management and operational management of Wasserverband Nord, as well as representatives of the lower water authority of the district of Schleswig-Flensburg. The sewage treatment plant Handewitt was expanded of approx. 6,000 inhabitants up to 10,000 inhabitants. An additional activated sludge tank was built as an activation in the accumulation plant (SBR), as well as a new blower station, pump station, P-precipitation system, a sludge drying and granulate storage hall and a mobile sludge dewatering facility. Therefore a new NSHV switchgear with automation and process visualization became necessary to be planned and built for the new sewage treatment plant facilities.
Despite the expansion to a two-line operation, the complete energy optimization also in the process itself, as well as the above mentioned improvments, according to the first forecasts, the energy consumption of the sewage treatment plant will be reduced to approx. 90,000 kWh / a.
The remarkable about the expansion of the sewage treatment plant is the close coordination between the Wasserverband Nord (building owner), the water authority and the environmental engineers. Because of the new „EU-Wasserrahmenrichtlinie (EU WRRL)“ the Meyner Mühlenstrom's had to be examined to its sensitivity to the discharge of purified water from the sewage treatment plant. This was a crucial task in during the approval planning. The compatibility of the project and the management objective of the „EU-Wasserrahmenrichtlinie (EU WRRL)“ in accordance to §§ 27 and 47 of WHG had to be considered. Corresponding empirical studies were carried out by a specialist biologist in order to make a technical contribution based on the „EU-Wasserrahmenrichtlinie (EU WRRL)“. The studies ended in the conclusion that there is no project-related deterioration in the ecological status of surface water and its chemical status on the outfall.