Water & Sanitation

 

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Project 1
Design, Tendering, Detailed Engineering and Technical Support During Construction for Wastewater Treatment Plant Sousa,
2014 – 2015

Client:
DST S.A / CONDURIL Engenharia S.A. for Aquas do Noreste, Portugal

Project description:
Design, tendering, detailed engineering and technical support during construction for wastewater treatment plant (WWTP) Sousa: 90,000 population equivalent (PE).

Technical data:
– maximum flow 1,027 m3/h,
– inlet pumping station (h = 17,7 m),
– fine screen (3 mm),
– 2 primary clarifiers (340 m3), 2 anaerobic selectors (2 x 157 m3),
2 biological reactors for nitrification/denitrification (2 x 6,600 m3)
with 2 x 2 surface aerators (4 x 75 kW),
– 2 final clarifiers (V = 1,310 qm),
– mechanical dewatering of surplus sludge (2 x 50 m3/h),
digester (2,145 m3), gas tank (800 m3),
– combined heat and power plant (250 kWel),
2 centrifuges (2 x 7 m3/h) and discharged air system (23,500 m3/h).

Services provided:
– Conceptual design and layout of entire plant;
– Detailed engineering for all components of plant;
– Tendering of all works and services;
– Technical support during construction period.

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Project 2
Energy Optimization of Nine Wastewater Treatment Plants of Wastewater Association “Main-Taunus“,
2010 – 2011

Client:
Wastewater Association “Main-Taunus“, Germany

Project description:
The 9 municipal wastewater treatment plants of the wastewater association “Main-Taunus“ are located in the vicinity of Frankfurt / Germany. The plants‘ population equivalents range between 1,600 and 50,000 PE with maximum daily inflow of 2,400 to 9,000 m3. All apply the activated sludge process, either with surface aerators or using fine-bubble aeration systems. All plants are designed for nitrification and denitrification, some for phosphorous removal, all for (additional) chemical phosphorous removal, applying different process cycles. The oldest plant has been put into operation in 1957, the youngest in 2007. Although the majority of the plants have been refurbished updated during the last years, but the owner / operator of the plants wished to reduce their energy costs by thorough analysis and optimization of the entire process, considering all stages and components of the plants. To describe the as-is situation of each plant, in-depth analyses including inventory and conditional and functional rating of the plants’ major components has been executed.
Highest attention was paid to aeration systems, process and operation of the process, as well as to measuring the current energy consumption. Process and operation along with the respective energy consumption has been assessed and evaluated, and optimization potential has been identified and quantified. After identifying a set of appropriate measures for energy saving / optimization, required investments and operational expenditures for such measures have been elaborated and proposed to the client.
Besides rather fundamental measures, quick-win measures – easily to be implemented at moderate cost – have been proposed. Systems analysis and elaboration of energy optimization measures did not only cover the individual plants, also interdependencies between the 9 plants have been investigated and synergies with respect to cost reduction and energy optimization have been identified.

Services provided:
– Analysis of as-is situation with regards to energy efficiency;
– Evaluation and assessment of current energy consumption and process;
– Identification of energy optimization potential and required measures;
– Cost estimate for implementation of measures (invest and operational expenditures);
– Elaboration of required optimization measures, including quick-win measures.

Project 3
Rehabilitation, Extension and Modification of WWTP Stuttgart Mühlhausen (2 separate projects),
2004 – ongoing

Client:
Landeshauptstadt Stuttgart, Eigenbetrieb Stadtentwässerung, Germany

Project description:
To adapt the purification capacity of WWTP Stuttgart Mühlhausen (1,200,000 PE) to increasing incoming loads, the existing aeration basin (36,000 m3) had to be increased and an additional secondary clarifier as well as a new return-sludge pumping station had to be constructed. Moreover, four existing secondary clarifiers had to be integrated into the new flow scheme. The existing blower station had to be rehabilitated and adapted to the new conditions. Also the SCADA system and the electrical installations had to undergo extensive rehabilitation and adaptation measures.
In the second project, six existing aeration basins will be removed and the site will be utilized for construction of two new large aeration basins with a blower station. Furthermore, an ammonification stage with two sequencing batch reactors and blower station, as well as all electrical power supply including transformer station, switchgears, power distribution will be implemented.
All works are executed during regular operation of the plant.

Technical data:
– 4 existing secondary clarifiers (dia. 50 m),
– additional secondary clarifier (dia. 50 m, depth 15 m),
– 2 new aeration basins (2 x 13,860 m3),
– ammonification stage with 2 sequencing batch reactors (2 x 3,150 m3).

Services provided:
– As-is analysis and economic investigations;
– Development of concepts;
– Preliminary design;
– Approval planning;
– Detailed design;
– Tendering;
– Site supervision;
– Project management services.

Project 2
Expansion of Wastewater Treatment Plant Forchheim,
2014 – ongoing

Client:
AZV Breisgauer Bucht, Germany

Project description:
Implementation of various expansion phases to upgrade the capacity from 600,000 to 660,000 population equivalent (PE) and increasing volume of the biological treatment stage and the secondary clarifiers by 50 %.
The major project tasks comprise connection of a new biological stage to the existing primary treatment stage, construction of a new return-sludge pumping station, new biological stage and blower station, construction of two new secondary clarifiers, connection of carbon dosing station and precipitation unit, construction of photovoltaic system, process optimization measures and implementation of new effluent measurement station.

Technical data:
– new return-sludge pumping station (Qmax = 2.7 m3/s),
– new biological stage (V = 18,300 m3, two-line),
– new blower station (4 x 2,500 m3/h – 6,000 m3/h),
– new secondary clarifiers (dia. 72 m),
– photovoltaic system with 119 kWp.

Services provided:
– Preliminary design;
– Approval planning;
– Detailed design;
– Tendering;
– Site supervision;
– Project management services.

Sellmannsbach
Project 2
Conceptual Design, Preliminary Design and Detailed Design of Sewer System Sellmannsbach,
2000 – ongoing

Client:
Emschergenossenschaft, Germany

Project description:
Sellmannsbach is a tributary watercourse of the river Emscher, which currently undergoes extensive rehabilitation and renaturation measures. Located in the old industrial and coal-mining region of the Ruhr in the western part of Germany, river Emscher and its tributaries (as Sellmannsbach) were traditionally utilized as open sewer channels for industrial and domestic wastewater. Since the area was prone to subsidence caused by the mining activities, construction of underground sewers was not recommendable in the past. After shutting down the vast majorities of the coalmines and eventual abatement of subsidence, underground sewers are implemented for the densely populated area and the river Emscher and its tributaries are being re-naturalized to improve standard of living of the residents.
The sewer system Sellmannsbach with a total length of approximately 5 km is located in the city area of Gelsenkirchen. It is realized as gravity flow sewer with storage capacity of concrete pipes (DN 1,200 to DN 3,200) with one lifting station. It dewaters parts of the City of Gelsenkirchen and flows into the main trunk sewer “Emscherkanal”.

Technical data:
– lifting station (head approx. 5 m),
– flow rate up to 15 m3/s.

Services provided:
– Project preparation (incl. initial data collection and inventory of basic data, feasibility study, development of the general design basis and field surveys);
– Preparation of conceptual design, preliminary design and detailed design;
– Approval planning;
– Tendering;
– Site supervision;
– Overall project management.

Project 2
Design and Ecological Improvements of Sewer System Boye,
2002 – 2015

Client:
Emschergenossenschaft, Germany

Project description:
Boye is the second largest tributary of river Emscher located in Ruhr region in the western part of Germany.
The Project, which was part of rehabilitation and renaturation of Emscher System, comprised planning of an approx. 4 km long section of the Boye mixed water sewer channel with diameters DN 1,600 to DN 3,500, including shafts and connecting structures. Planning covered determination of optimized pipe diameters for several alternative routings, crossing of main roads B224 and L511 and two railway lines, connection of several lateral channels and waterbodies and design of a relief structure.

Technical data:
– Sewer channel: approx. 3,300 m of tunneling up to DN 3,500; approx. 700 m of open trench pipe laying; approx. 75,000 m3 of earthworks; approx. 45,000 m2 of sheeting wall system; approx. 5,000 m2 of bored pipe wall.
– Stormwater treatment: sewage channel storage volume: 20,000 m3; stormwater retention basin volume: 25,000 m3; soil filter volume: 7,500 m3; max. flow rate: 20 m3/s.
– Water body and landscaping: approx. 209,000 m3 of earthworks; approx. 11.5 ha of planting; approx. 3,200 m of foot paths and cycle paths.

Services provided:
– Preliminary design;
– Approval planning;
– Detailed design;
– Tendering;
– Project management;
– Structural design for river crossing.

Project 2
Design and Ecological Improvements of Sewer System Haarbach,
2002 – 2015

Client:
Emschergenossenschaft, Germany

Project description:
The sewer Haarbach is located alongside the upper reaches of Haarbach brook in the Emscher catchment, near the city of Gelsenkirchen in the western part of Germany.
The project was part of rehabilitation and renaturation of Emscher system and comprised planning and construction of an approx. 3.2 km long mixed water sewer channel with diameters DN 1,800 to DN 3,500 providing sufficient storage capacity. Planning included crossing of motorway A2 by tunnelling and structural planning of new pipe bridges of the Ruhr Oil AG., planning and construction of stormwater retention basin with soil filter as a pre-treatment unit for further downstream stormwater treatment, planning and implementation of the ecological improvement of the water body Haarbach and landscape planning services.

Technical data:
– Sewer channel: approx. 1,800 m of tunneling up to DN 3,500; approx. 1,400 m of open trench pipe laying; approx. 60,000 m3 of earthworks; approx. 20,000 m2 of sheeting wall system.
– Stormwater treatment: sewage channel storage volume: 15,000 m3; stormwater retention basin volume: 2,500 m3; soil filter volume: 7,000 m3; max. flow rate: 30 m3/s.
– Water body and landscaping: approx. 22,000 m3 of earthworks; approx. 1.4 ha of planting; approx. 2,500 m of foot paths and cycle paths.

Services provided:
– Preliminary design;
– Approval planning;
– Detailed design;
– Tendering;
– Project management;
– Structural design for river crossing.

Project 2
Planning and Design of Pumping Stations Gelsenkirchen and Bottrop (2 separate projects),
2005 – 2014

Client:
Emschergenossenschaft, Germany

Project description:
Gelsenkirchen and Bottrop pumping stations are backbone infrastructures of the future “Emscherkanal” (55 km long, 40 m deep, dia. up to 3.80 m). In order to allow for gravity flow (flow rate of up to 13.3 m3/s) lifting of the sewage by around 30 m at these locations is necessary.
The projects were implemented by a German consortium and comprised all planning and design stages from conceptual design to detailed design, tendering and site supervision and management for two huge greenfield infrastructures located in the densely populated industrial region of the Ruhr Area in the western part of Germany.

Technical data:
– construction pit with overlapped bored pile wall (dia. of pile: 1.5 m – 1.8 m),
– upper ring (dia. 47 m (Gelsenkirchen) / 48 m (Bottrop)),
– lower ring (dia. 41 m (Gelsenkirchen) / 42 m (Bottrop)),
– depth of excavation 37.25 m (Gelsenkirchen) / 40 m (Bottrop),
– excavated soil (V= 61,000 m3 (Gelsenkirchen) / 64,000 m3 (Bottrop)),
– concrete C 35/45 (approx. 5,200 m3) and acid-resistant concrete C 35/45 (approx. 8,750 m3),
– formwork (24,000 m2),
– reinforcement (1,500 t),
– PE-HD lining (approx. 7,700 m2).

Services provided:
– Structural engineering;
– Site supervision.