Within the framework of this announcement, the following services will be awarded for the project "Conversion/Extension ZKA (Central Wastewater Treatment Plant) Wertheim-Bestenheid" as part of an overall planning phases 1 to 9 for the following planning services:
Services according to HOAI Part 3 Section 1, §§41 ff. - Object Planning Engineering Structures;
Services according to HOAI Part 4 Section 1, §§49 ff. - Structural Engineering;
Services according to HOAI Part 4 Section 2, §§53 ff. - Technical equipment; EI&C plant groups 4, 5 and 8
Services according to HOAI Part 4 Section 2, §§53 ff. - Technical equipment; Plant group 7.2. Process plants.
The total value estimated under II.1.5) is not based on a detailed cost estimate, it is a notional cost estimate in order to be able to obtain comparable offers in stage 2 of the procedure.
Within the framework of this announcement, the services listed under II.1.4) will be awarded. The client reserves the right to commission further special services, and it is also pointed out that any parts of the plant currently planned will not be planned/executed. As part of the planning, the connection of further municipalities is planned and must be taken into account.
The project description can be found in the tender documents, here is an excerpt:
The Wertheim-Bestenheid central sewage treatment plant (ZKA) is a collective sewage treatment plant operated by Wertheim's own wastewater disposal company with a capacity of 29,000 EEC. Wastewater is discharged from the city center, from 10 districts and commercial and industrial areas with about 150 indirect discharging companies.
In order to take into account future developments and to determine the current status of the plant, an energy efficiency analysis (EEA) was carried out in 2021 and 2022 as of 28.10.2022. This report contains conceptual considerations for the expansion of the ZKA, from which the measures, which are now to be planned via the VgV procedure, result.
Objective/task:
At the core of the upcoming overall planning are process engineering and hydraulic aspects that can be used to meet the future requirements for the purification performance of the wastewater treatment plant. At the same time, energy aspects of the present energy efficiency analysis are to be planned and implemented in the course of the expansion of the plant. The aim is to examine the extent to which the measures can be implemented in several construction phases.
If, in the context of the upcoming planning, findings deviating from the investigations of the energy efficiency analysis emerge, these must be discussed and included.
Furthermore, it is to be examined whether funding from the state of Baden-Württemberg is possible through the implementation of structural improvement measures (connection of the KA Hasloch).
The following components of the central sewage treatment plant are to be newly built or checked and adapted if necessary:
1.) Inlet hoist, mechanical stage (overcalculation, adjustment if necessary depending on the result
2.) DN basins 1 and 2
3.) New construction of the distribution structure, aeration tank
4.) Construction of new aeration tank and blower station
5.) New construction of the distribution structure for secondary clarification
6.) New 2 secondary clarifiers (NKB)
7.) Drain pipes and shafts
8.) Replacement Excess Sludge Thickening
9.) Faulgasbehälter
10.) Sludge press building (building should remain in the existing building)
11.)Replacement of digester gas storage tank
The design of the two CHP modules must be coordinated with the control system and the digester gas storage tank.
13.) "Thinking ahead" 4th purification stage
The plant for the 4th cleaning stage is not to be specifically planned in the course of the current planning, but connection options etc. for their subsequent execution.
14.) "Thinking ahead" new hall construction and photovoltaic system
The construction of a new hall and photovoltaic system are not to be specifically planned in the course of the current planning, but connection options etc. for their subsequent execution.
15.) "Thinking ahead" production of hydrogen
A study is currently being conducted on this topic, the result of which is not foreseeable. This fact should be taken into account in the planning process in order to incorporate new findings into the planning of the upcoming expansion work for the ZKA Wertheim, if necessary.
16.) Blackout
The possible case of a blackout should be taken into account in planning and conception. It should be noted that both the power supply for process plants and the power supply for switchgear/computers can be maintained separately from each other.
The schedule is planned as follows:
VgV procedure until the end of October 2023
Start of planning immediately after commissioning, from November 2023
Construction approx. 01.01.2026 to 30.09.2027