HYDRO-Ingenieure Energie & Wasser GmbH


HYDRO Engineers Energy & Water Ltd

Company profile

Company details

Foundation: 02.11.2009

Legal form: Limited liability company
commercial Register B, Local Court Kaiserslautern, HRB 30814

Managing director: Mr. Dipl.-Ing. Stefan Krieger

Authorized signatory: Dr. Andreas Blank

Headquarters: Kais erslautern

Further locations: Darmstadt, Karlsruhe

HYDRO-Ingenieure Energie & Wasser GmbH is an SME and has no other subsidiaries.

Water is life

HYDRO-Ingenieure Energie & Wasser GmbH provides consulting and engineering services for the sustainable provision and use of the resources energy and water. The focus of our work is on wastewater and sludge treatment, water supply and treatment , and decentralized energy systems. We provide all services required for the realization of projects in these areas from a single source.

Company structure and staff qualification

HYDRO-Ingenieure Energie & Wasser GmbH has its headquarters in Kaiserslautern as well as locations in Darmstadt and Karlsruhe. The number of employees in 2023 is about 30 persons with the following qualifications: Civil engineers, mechanical engineers and technicians, electrical engineers and technicians, environmental engineers, process engineers, graduate business economists and CAD designers.

We act in a fiduciary capacity from the basic evaluation through all service phases of the HOAI (Fee Structure for Architects and Engineers) to the commissioning, irrespective of the task in hand.

Business areas

Wastewater treatment

In the field of wastewater treatment, we offer our customers extensive experience in special areas in addition to the mechanical / biological treatment processes. In particular, in the topic of trace substances, such as the elimination of pharmaceutical residues, heavy metals or poorly degradable organic compounds, which are increasingly becoming the focus of consumers or in the field of nutrient recovery.

Selection of references:

  • Wastewater treatment plant Stuttgart Mühlhausen - Reconstruction and extension of the biological treatment stage /4th treatment stage
  • Wastewater treatment plant Karlsruhe - Reconstruction and optimization of the biological treatment stage
  • Wastewater treatment plant Neustadt/Weinstraße - Optimization of the activated sludge plant
  • Germersheim wastewater treatment plant - renewal of the aeration system
  • Landau wastewater treatment plant - Renewal of the screening system
  • Marburg wastewater treatment plant - construction of the precipitant storage and dosing station for P elimination
  • Wastewater treatment plant Heidelsheim - construction of a 4th treatment stage

Sludge treatment

Due to the regulations of the new legal basis for sewage sludge treatment and disposal (Sewage Sludge Ordinance, Fertilizer Act, Fertilizer Ordinance and Fertilizer Ordinance), which were revised in 2017, there are serious effects on the required treatment processes before disposal of sewage sludge. We consider the field of sludge treatment in its entirety starting from thickening to stabilization and digester generation to dewatering.

Selection of references:

  • Wastewater treatment plant St. Leon-Rot - New construction of a mechanical excess sludge thickening plant (MÜSE)
  • Wastewater treatment plant Weilerbach - New construction of a high-load digestion plant
  • Billigheim wastewater treatment plant - construction of a compact digestion plant
  • Frankenberg wastewater treatment plant - rehabilitation of the digestion tank
  • Wastewater treatment plant Fulda - Replacement of a belt press by a centrifuge
  • Wastewater treatment plant Mühlheim/Main - New sludge dewatering by means of a centrifuge

Pumps & special structures

In the field of pumping stations, e.g. at wastewater treatment plants for wastewater and sludge transport or also in sewer networks for maintaining a regulated operation, Hydro engineers have the required competence and experience.

Selection of references pumping stations:

  • Karlsruhe sewage treatment plant - return sludge pumping stations I and II (incl. EMSR-T)
  • HKW Stuttgart - pump house 4 and 5(incl. EMSR-T)
  • Intermediate pumping station Cologne-Stammheim
  • Altenkirchen wastewater pumping station (incl. EMSR-T)
  • Wastewater pumping station Rodbach (Luxembourg)
  • KA Germersheim, PW Wörth (incl. EMSR-T)

Water supply

HYDRO engineers advise public and private supply and disposal companies on water extraction and treatment, especially in the field of physical/chemical processes, filtration, membrane technology and reverse osmosis. Our range of services is completed by the areas of supply network optimization, renewal and planning of energy-efficient pumping stations, booster stations, of transport pipelines as well as the preparation of management concepts.

Selection of references:

  • Water supply Khabarovsk/Russia (incl. EMSR-T)
  • New construction of the main waterworks Rodalben of the city of Pirmasens (incl. EMSR-T)
  • Waterworks Heltersberg

Decentralized energy systems

We accompany and support companies and municipalities in measures to increase energy efficiency, such as energy saving and recovery, the coupling of power and heat supply (CHP) and the integration of renewable energies into existing plants.

Selection of references:

  • ZKA Kaiserslautern, renewal of CHP unit, construction of heat storage and central heat distributor
  • BHKW hospital Siloah, hydraulic and thermotechnical integration (incl. EMSR-T)
  • AV Weißach- und Oberes Saalbachtal, renewal of CHP and heating system
  • Wastewater association Obere Lutter - renewal of sewage gas treatment and CHP plant


HYDRO engineers offer services in the form of preliminary investigations, feasibility studies, all planning phases, tendering and construction management as well as operation optimization in the above mentioned fields. In particular in the following areas:

  • Process engineering and hydraulics
  • Engineering structures
  • Mechanical and piping engineering
  • Electrical, measurement and control technology
  • Heat supply technology

Furthermore, we offer services such as energy checks, preparation of energy concepts, feasibility/efficiency analyses and consulting services in the field of application and process technology.


Managing Director

Dipl.-Ing. Stefan Krieger

Phone: +49 (0) 173 516 82 11


Office Kaiserslautern
Dipl.-Ing. Nico Barthel

Richard-Wagner-Strasse 45

D-67655 Kaiserslautern

Phone: +49 (0) 631 205 80-20


Darmstadt Office

Kirstin Claußen, M.Sc.

Havelstr. 7a

D-64295 Darmstadt

Phone: +49 (0) 6151 384 88-13


Karlsruhe Office

Dr. Ing. Andreas Blank

Albtalstrasse 13

D-76137 Karlsruhe

Phone: +49 (0) 721 957 969-11



Sustainable water management

Mechanical and biological wastewater treatment, elimination of trace substances, anaerobic sludge treatment, sludge dewatering, process water treatment, sewage gas treatment, combined heat and power plants, pumping stations, sewer network calculations

Environmentally friendly energy generation and storage

Heat recovery, heat generation, heat networks, cogeneration, absorption chillers, heat storage, electric heaters (power to heat)

Sustainable water management

Water treatment (phys./chem. processes, filter technology, membrane technology, reverse osmosis), drinking water reservoirs, pressure boosting systems, network calculations, network management concepts, energy recovery (pump as turbine)


Reference Project Sustainable Water Management

Energy self-sufficient group wastewater treatment plant Weilerbach
Minimization of energy consumption by converting sludge stabilization to high-load digestion, optimizing drive technology and energy management.
Maximization of own energy generation through power, heat coupling (CHP)
Measure was a prize winner at the Federal Innovation Award in 2011

Reference Project Environmentally Friendly Energy Generation and Storage

Cogeneration of power, heat and cold (CHP)
Hydraulic and thermal integration of a CHP unit (Ptherm = 2 MW) into the district heating network of the city of Pforzheim and the secondary circuit of a hospital, concept for the utilization of the waste heat of the CHP unit for cooling by means of an absorption chiller.

Energy efficiency

Overall optimization concept for the water supply of a Russian city
Hydraulic network calculation, network management concept, machine and
and electrotechnical optimization of the water production and pressure boosting systems.




HYDRO-Ingenieure Energie & Wasser GmbH

HYDRO-Ingenieure Energie & Wasser GmbH
Albtalstraße 13
76137 Karlsruhe

More locations

Kaiserslautern, Darmstadt

HYDRO-Ingenieure Energie & Wasser GmbH is responsible for the content of this company profile as well as the compliance with the copyrights of the image material.