Water and Wastewater Treatment

Efficient solutions for municipal and industrial wastewater treatment plants

AERZEN is an internationally leading supplier in the field of wastewater treatment. For more than 150 years, we have accompanied operators of wastewater treatment plants and industrial partners with innovative solutions and can rightly claim: We know what to do. How can energy costs be saved in wastewater treatment? What possibilities are there for the design of new plants? How can load profiles be determined and optimally operated? AERZEN provides the right answers with its versatile and flexible solutions, as well as the experience from countless implemented projects.
Ask us, we are happy to share our experience - LET'S TALK!

Performances for Wastewater Treatment

As the operator of a wastewater treatment plant, you have to react to the increasing and changing requirements. Make use of our know how. In addition to the right products, we offer one thing above all: Know-how! 

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Performance³ - Increase Efficiency

Not too much, not too little - always exactly fitting. The changing load requirement in the aeration tank is a challenge for any aeration technology. AERZEN has found a way to always operate this load change precisely. Save costs and experience previously unattainable levels of efficiency in overall operations!

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Wastewater Treatment Advisor

Here you will find current information on the subject of water and wastewater treatment, funding opportunities, technological future and much more. Benefit from the decades of experience and the current knowledge of the Aerzener Maschinenfabrik.

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Information & Documents


Solutions for wastewater treatment



Efficiency in wastewater treatment



Digital services in wastewater technology


Case Studies

In our more than 150-year company history, we have acquired extensive know-how as a manufacturer of blowers and compressors. With this bundled know-how AERZEN is currently represented in more than 100,000 wastewater treatment plants worldwide and delivers custom-fit, highly efficient solution concepts for the wastewater market. See for yourself!

Casestudy Liebenwalde From power eater to energy leader

Casestudy Oberengadin Most modern WWTP in Europe

Casestudy Oberschleißheim Efficiency that vitalises

Suitable Products

for Wastewater Treatment Plants

US Units


Screw Blower
Delta Hybrid direct driven

Type of technology
Screw Blowers
Differential pressure (Δp)
300 to 1.250 mbar
Volume flow
400 to 4.800 m3/h

Positive Displacement Blower
Delta Blower Generation 5

Type of technology
Positive Displacement Blowers
Differential pressure (Δp)
-500 to 1.000 mbar
Volume flow
30 to 15.000 m3/h
Air, Neutral Gases

Screw Blower
Delta Hybrid belt driven

Type of technology
Screw Blowers
Differential pressure (Δp)
300 to 1.500 mbar
Volume flow
100 to 9.000 m3/h

Turbo Blower
Aerzen Turbo Generation 5plus

Type of technology
Turbo Blowers
Differential pressure (Δp)
600 to 1.000 mbar
Volume flow
360 to 8.400 m3/h

Turbo Blower
Aerzen Turbo Generation 5

Type of technology
Turbo Blowers
Differential pressure (Δp)
600 to 1.000 mbar
Volume flow
3.000 to 16.200 m3/h

Control Technology

Convenient, safe and efficient control


AERtronic is the intelligent unit control system from AERZEN. Developed to offer you more. More transparency over your plant’s condition. More reliability, driving the best possible operations at any time. Use the path to the digital future.

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AERsmart – intelligent, efficient, trendsetting
The load operation in biological wastewater treatment plants is characterised by strong fluctuations. Taking aeration tank efficiency to the next level - with intelligent master control.

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Digitisation opens up new opportunities for companies in many industries to optimise processes. In blower and compressor technology, the trend is moving more and more towards automated recording, evaluation and analysis of operating data.

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Fairs & Events 360° Experience - Water and Wastewater

Did you miss the last IFAT? No problem! Visit our virtual stand and experience our exhibits from all angles.
AERZEN presented innovative new products at the world's largest trade fair for environmental technologies, hitting the nerve of the times.

  • Performance³ - The new generation
  • AERprogress - More efficient processes by means of digitisation
  • Get the 360° Experience

360° Experience

Wastewater Treatment

How can you save money on energy costs with wastewater treatment? What are the possibilities for a new facility design, replacing old models and components, or modernizing? These are important questions for every operator of any wastewater treatment plant. AERZEN can answer all your questions with its versatile and diverse solutions.

AERZEN is a leading international supplier of solutions for wastewater treatment and purification. Wastewater treatment in sewage plants is one of the largest fields for AERZEN blower technology. Compressors, blowers, and turbo blowers ensure the ventilation of the ventilation tanks in all types of sewage treatment plants. The application ranges from the small biological sewage treatment plant to larger plants, which are responsible for wastewater treatment in several municipalities. The machines from AERZEN enrich the wastewater by supplying compressed air with oxygen. The necessary oxygen is then fed to the bacteria, which enables them to degrade and eliminate waste particles in the ventilation tank in a biological way. This step of wastewater treatment takes 60 - 80% of the total energy costs of the sewage treatment plant. With this large chunk of energy costs, one can assume that a lot of money can be saved by using the most efficient technology available.

Regarding this energy technology, another important step for better efficiency is to monitor and optimize your daily and yearly fluctuations. An example would be the energy expenditures for the aeration of an active sewage treatment tank at a popular holiday resort; on a warm summer day with much higher volume, versus a cold day in winter. If the performance of the blowers can be tuned and adapted to these fluctuations, you can save a considerable amount of money and energy. To achieve this, it is worth taking closer consideration of each and every situation. How large is the wastewater treatment plant, are there large fluctuations, and/or is the workload evenly distributed? Are all the blowers at the optimal output, and do they match the control rate and the workload rate of the sewage treatment plant? How much space is available for the blower? How much longer will the facilities last, and when will it need a major overhaul? Basically, every sewage treatment plant needs to draw up some precise plans.

Positive Displacement Blowers (Rotary Piston Blowers)

Rotary piston blowers (e.g. the AERZEN Delta Blower) are the workhorses of the blower solutions. With relatively low initial costs, they can cover large control areas and offer a possibility of flexible applications. Rotary piston blowers can adjust pressure and temperature fluctuations with ease.

The use of positive displacement blowers is, by far, the most widely used in wastewater treatment. The remarkable flexibility within the control range can be easily realized with a frequency converter. Thus, consistency is produced even with fluctuations in capacitance. The comparatively low investment costs pay for itself in very little time.

Turbo Blowers or Turbo Compressors

Turbo technology is often the most efficient solution for a process with a restricted, yet consistent control range and speed. With continuous operation close to its design point, the energy saved by the turbo is substantial compared to rotary piston blowers. The higher costs associated with the purchase will be easily offset by the turbos’ efficiency. The use of turbos is less suitable in a system with frequent extreme pressure and flow fluctuations.

Another advantage of the turbo is its smaller size. It requires a smaller installation space, which allows a more flexible use of blower space (e.g.: for retrofitting or redesigning the system). This can also reduce costs. AERZEN supplies the turbo and the other components as a package: the motor, blower and control are supplied as a complete machine and simple installation.

Hybrid Blower (Rotary Piston Compressor or Rotary Lobe Compressor)

A Hybrid Blower combines the best features and advantages of Rotary Blowers and Screw Compressors, with the efficiency of the Turbo Blowers. The main structural difference is the use of a low-pressure Screw Rotor instead of a straight or lapped rotary piston rotor. As a result, high flow and pressure fluctuations can be controlled flexibly and efficiently. Hybrid blowers offer a similar control range as positive displacement blowers and guarantee a relatively consistent volume of pressure changes. A Hybrid Blower has a control range of 25 to 100%. The advantage over Turbo Blowers is the superior efficiency in the partial load areas of the machine.

The installation of a combination of the above-mentioned machine- technologies is quite worthwhile in large sewerage treatment plants or large capacity and high fluctuation plants (e.g.: turbo compressor is used for the basic load and a hybrid blower is switched on for the peak load or low flow conditions).

The different types of machines can be used equally in the sand catchers and in the ventilation tank. A combination of turbo bowers, rotary lobe compressors, and rotary piston blowers can improve energy efficiency and substantially reduce the operating costs of the wastewater treatment plant. AERZEN offers solutions with its concept "Performance³".

The first is the intelligent AERZEN Performance³ software "AERsmart", which selects the most energy-efficient machine combination for every required operating point, guaranteeing that all machines will operate at their ideal with maximum efficiency.

The applications in wastewater technology are diverse. To assist in identifying the most fit and efficient system, AERZEN offers its customers a special assessment, the “AERaudit”, with which performance data of an existing system are measured and evaluated. Based on this analysis, improvements and energy-saving possibilities can be determined for each customer’s installation. Additionally, AERZEN has compiled a comprehensive assortment of materials for planning the sites for its customers. In addition to numerous product and planning information, plant engineers, engineering firms, and operators of sewage treatment plants will also find help calculating operating data, important information on machine room design, and tips for the possibility of heat recovery during treatment of wastewaters.

Numerous user feedbacks and reports in the field of wastewater purification illustrate, for example, how efficient solutions for very different needs are created with the appropriate use of different blower components.

Thus the efficiency of the Silverstone Sewage Treatment Plant in Colorado, USA, which was built in 1974, and which is responsible for wastewater purification and treatment in several municipalities - including holiday resorts with high fluctuations in demand – has been clearly improved by replacing the old centrifugal blowers with AERZENER Blower technology and additional frequency converters.

The AERZEN Turbo TB 100 (used here) is equipped with a permanent magnet motor, which has been specially developed for the high frequency and high-speed requirements of a directly-driven turbo application. As a result, the noise level has been drastically reduced and hearing protectors have become unnecessary. Additionally, the hot air from the cooling system of the fan can be used in winter for heat recovery, thus heating the system.

But also numerous success stories from the surrounding area speak for the quality and profitability of AERZEN products: In the Emsbüren Sewage Treatment Plant in southern Lower Saxony (Germany), an air-bearing turbomachine from AERZEN has replaced a magnet-bearing turbo of a competitor in March 2016. The turbo of the Series TB50-0.8 S covers the medium and high load operation of the plant designed for 16,000 EEC. The low-load operation at night is covered by a Rotary Piston Blower. The AERZENER Turbo is operated intermittently.

During start-up, the air bearing turbo initially starts in full-load operation, and maintains this operation for 10 minutes. Subsequently, 60% -70% of the maximum volume flow is reduced for a period of 60-80 minutes. Once the required oxygen reached the aeration tank, the turbo is initially switched to idling and then completely turned off. Through the intermittent operation with the appropriate shutdown processes, it became possible to adapt to different load requirements and to save energy. Based on good customer rapport with the air-bearing turbo from AERZEN, it was Lingener Land water board’s responsibility to replace a magnetic bearing machine with an air bearing turbo from AERZEN in the Spelle waste water treatment plant.

Another AERZEN success story in Germany is the Holzkirchen Wastewater Treatment Plant near Munich. 80% of the total energy costs of the waste water treatment plant are generated here for the drive of the blowers. Therefore, a tailor-made design and increases of impact turned out to be profitable very quickly. For the changing air requirements in the aeration tank, an exact air-dimensioning with an exact regulation was needed. In the AERsmart control of AERZEN a suitable answer was found. Based on the air requirements, this coordinates different blower types. Like an autopilot, the AERsmart adopts the control and regulatory management of the units, with different operating principles and implementations in-line with the requirements. The basic load is provided by a TB75-0.8S Turbo Compressor. In the case of peak loads, a rotary piston compressor of the Delta Hybrid Series is additionally used, with two Delta Blowers of the older type, taking over the air supply when the load is low. Partial loads within the facility are largely avoided by the targeted control and the differentiated use of the individual machines. At the same time, energy efficiency increases. An efficient treatment of wastewaters made easy by AERZEN!

A detailed reference report on the AERZEN ventilation systems in the sewage treatment plant in Holzkirchen near Munich can be found under this link.

For further information on selecting the most effective blower technology, please refer to our Whitepaper.

You have questions? LET'S TALK

Find your regional contact and get personal advice.

Aerzener Maschinenfabrik GmbH (Headquarter)

Reherweg 28

31855 Aerzen

Phone: +49 5154 81-0

Fax: +49 5154 81-9191

Emmerthaler Apparatebau GmbH

Langes Feld 4

31860 Emmerthal

Phone: +49 5155 622-0

Fax: +49 5155 622-11

Aerzen Turbo Europe GmbH

Freibusch 2-4

31789 Hameln

Phone: +49 5151 92384 0

Aerzen Digital Systems GmbH

Hefehof 8

31785 Hameln

Phone: +49 5151 40302660

AERZEN Deutschland GmbH & Co. KG (Sales)

Reherweg 28

31855 Aerzen

Phone: +49 5154 81 4000

AERZEN Deutschland GmbH & Co. KG (Service)

Reherweg 28

31855 Aerzen

Phone: +49 1516 110 2901

Aerzen do Brasil Ltda

Rua Dionysio Rito, n° 300, Distrito Industrial III, L14 Q D

13213-189 Jundiaí

Phone: +55 11 4612-2021

Fax: +55 11 4612 0232


Pezinská 18

901 01 Malacky

Phone: +421 34772 5531

Fax: +421 34772 5529

- Sales Office South West

Brückenstraße 2a

66740 Saarlouis-Fraulautern

Phone: +49 6831 76828 0

Fax: +49 5154 81 716410

Aerzen Argentina SRL

Domingo de Acassuso 4743

B1605BFO Munro, Buenos Aires

Phone: +54 11 47622351

Aerzen France S.A.S

Zone Industrielle 10, Avenue Léon Harmel

92168 Antony Cedex

Phone: +33 1 46741300

Fax: +33 1 46660061

Aerzen Belgium N.V.

A.De. Coninckstraat 11

3070 Kortenberg

Phone: +32 2 757 22 78

Fax: +32 2 7572283

Aerzen Schweiz AG

Gewerbepark Morgenstern Im Alexander 4

8500 Frauenfeld

Phone: +41 52725-0060

Fax: +41 527250066

AERZEN Nederland B.V.

Bedrijventerrein Nieuwgraaf Fotograaf 3

6921 RR Duiven

Phone: +31 26 3197530


Typograaf 5

6921 VB Duiven

Phone: +31 88 9100050

ASP AERZEN Special Products B.V.

Bedrijventerrein Nieuwgraaf Fotograaf 3

6921 RL Duiven

Phone: +31 26 4463432

Fax: +31 26 4463049

Aerzen Finland OY AB

Teollisuustie 15

FI-02880 Veikkola

Phone: +358 9 8194720

Aerzen Colombia S.A.S.

Centro Empresarial Metropolitano, Bodega 27, Módulo 2 (Autopista a Medellín, km 3,4) Cota, Cundinamarca,

Código Postal 250017 Código

Phone: +57 601 841 5730

Fax: +57 601 841 5730

Aerzen Austria Handelsges.m.b.H.

Gewerbepark Tresdorf II/1

2111 Tresdorf

Phone: +43 2262 74388

Fax: +43 2262 74399


Al. Niepodleglosci 18

02-653 Warszawa

Phone: +48 22 489 55 22

Fax: +48 22 489 55 27


Alíz Utca 4

1117 Budapest

Phone: +36 1 4392200

Fax: +36 1 4391922

AERZEN CZ s.r.o.

Hraniční 1356

69141 Břeclav

Phone: +420 519 326 657

Fax: +420 519 326658

Aerzen Ibérica S.A.U

Calle Adaptación 15-17

28906 Getafe (Madrid)

Phone: +34 91 642 4450

Fax: +34 91 642 2903


Rua Alfredo Lopes Vilaverde, 15B Escritório 3

2770-009 Paço de Arcos

Phone: +351 21 468 2466

Fax: +351 21 468 2467


Aerzen House, Langston Road

IG10 3SL Loughton, Essex

Phone: +44 2085028100

Fax: +44 2085028102


61 Woodlands Industrial Park E9 E9 Premium, #07-01

757047 Singapore

Phone: +65 6254 5080

Fax: +65 6254 6935


company profile

Aerzen Taiwan Machinery

Branch office of Aerzen Asia No.170, Ln. 879, Guangfu Rd., Bade Dist.,

Taoyuan City 33457

Phone: +886 3 366 6660

Fax: +886 3 366 6536


company profile

Aerzen Scandinavia AB

Östra Bangatan 20

19560 Arlandastad

Phone: +46 8 59441880

Fax: +46 8 59117209

Aerzen Scandinavia Norway

Raveien 320

3184 Borre

Phone: +47 33 29 22 12

Aerzen Scandinavia Denmark

Industrivej 2

5550 Langeskov

Phone: +45 20 44 55 81

Aerzen USA Corporation

108 Independence Way

Coatesville, PA 19320

Phone: +1 610 380 0244

Fax: +1 610 380 0278


980 Rue Valois, Suite 100 Vaudreuil-Dorion

J7V 8P2 Quebec

Phone: +1 450 424 3966

Fax: +1 450 424 3985

Aerzen México S.A. de C.V.

Cerrada Uniroyal # 18-A, Col. La Michoacana

Metepec, 52166

Phone: +52 722 235 9400

Fax: +52 722 235 9401

AERZEN MAKINE San. Ve Tic. Ltd. Sti.

IMES Sanayi Sitesi, C Blok, 308. SK, No:14, Y.Dudullu

34776 Ümraniye Istanbul

Phone: +90 216 420 00 32

Fax: +90 216 420 00 79


company profile

AERZEN Machines (India) PVT. LTD.

Plot No. E-115/116, G.I.D.C , Manjusar, Tal. Savli, Dist:

Vadodara-391 775 Gujarat

Phone: +91 2667 264-817

Fax: +91 2667 264-818


company profile


Via Raffaello Sanzio, 52

20021 Bollate (MI)

Phone: +39 02 6707 5277

Fax: +39 02 6707 5003


No. 655 Yuan Dian Road, Min Hang District

Shanghai 201108

Phone: +86 21 3323 9000

Fax: +86 21 3323 9199

Aerzen Romania S.R.L.

Sat Tunari Comuna Tunari Sos. De Centura nr. 25A

RO 077180 Judet Ilfov

Phone: +40 21 243 1883

Fax: +40 21 243 1884

Aerzen ME - FZE

DSO-DDP-Office-A1-222 Dubai Silicon Oasis P.O. Box: 341445


Phone: +971 0 432 431 66

Aerzen Adria d.o.o.

Varazdinska ulica, II odvojak 3

42000 Varazdin

Phone: +385 42 370 808

Fax: +385 42 370 018

Aerzen Australia Pty Ltd

57-59 Rodeo Drive

3175 Dandenong

Phone: +61 3 97067702

Fax: +61 3 9706 8584

Aerzen Chile SPA

Limache 3363 – Bodega 13

CP: 2520642 Viña del Mar

Phone: +56 32 235 8900

Aerzen Perú SAC

Carr. Panamericana Sur Km. 29.5 Almacenes F-08 y F-09 ZI Megacentro – Altura Puente Vidu

 Lurin – Lima

Phone: +51 1 434 3831


Sheraton Housing 35 el moltaka el araby, Nozha elgedida. Appt - 7, 8, 9.


Phone: +20 2 22698855

Fax: +20 2 22696611

Aerzen AIRGAS (PTY) Ltd.

175 Domkrag Street, Robertville Ext. 1

Roodepoort, Johannesburg

Phone: +27 0 11 474 2193

Fax: +27 0 11 474 2321


4-Jinnah Cooperative Housing Society, Block 7/8, Main Sharea Faisal

75350 Karachi


company profile


Patraikou 21-23, Flat 101, Palouriotisa TK 1048, P.O. Box 25283

1308 Nicosia

Phone: +357 22441222

Fax: +357 22490641

L.A Engineering & Consulting Ltd

PO Box 2907, 25 Ha‘ela Street

40500 Even Yehuda

Phone: +972 9 8996544

Fax: +972 9 8996547


Ul. Archaritza 2A

4006 Plovdiv

Phone: +359 32 966 681

Fax: +359 32 966 702

Aerzen Adria d.o.o.

Varazdinska ulica, II odvojak 3

42000 Varazdin

Phone: +385 42 370 808

Fax: +385 42 370 018

Airgas Compressors (PTY) Nigeria Limited

3, Adebukola Omolabake Street, Off Eric Omobude Street, Ifako Bus Stop, Along Oworonsoki - Ogudu Expressway


Phone: 00234 0 1 843 4234

Aerzen Thailand Co., Ltd

36/60 Village No. 5, Phlu Ta Luang, Subdistrict, Sattahip District

20180 Chonburi

Phone: +66 0 38 020 090

Fax: +66 86 664 1337


Representative office of AERZEN ASIA PTE. LTD Floor 8th, Unit 802A, Dai Minh Convention Tower, 77 Hoang Van Thai, Tan Phu Ward, District 7, Vietnam

 Ho Chi Minh City

Phone: +84 28 3535 2760

Aerzen Turbo Co, Ltd

800 Jeongjung-ri, Osong-eup, Heungdeok-gu, Cheongju-si,

Chungcheongbuk-28220 Korea

Phone: +82-43-238-6500

Fax: +82 70 4170 4567

local partner: DEWA Projekt OÜ

Väike-Ameerika 15

10129 Tallinn

Phone: +372 50 39239

Aerzen Finland OY AB

Teollisuustie 15

FI-02880 Veikkola

Phone: +358 9 8194720

Aerzen Australia - New Zealand Office

Unit 17a Hobill Avenue Wiri

2104 Auckland

Aerzen Australia Pty Ltd

57-59 Rodeo Drive

3175 Dandenong

Phone: +61 3 97067702

Fax: +61 3 9706 8584


Unit 6a, Castlecomer Business Park, Kilkenny Rd, Ballyhimmin

R95 Castlecomer, Co. Kilkenny

Phone: + 353 567807085

Aerzen Korea Ltd

Hyundai Terrace Tower, E-dong #608, 7, Yeonmujang 5ga-gil, Seongdong-gu,

04782 Seoul

Phone: +82 2 6463 0063

Fax: +82 2 6463 0064

Aerzen Turbo Co, Ltd

800 Jeongjung-ri, Osong-eup, Heungdeok-gu, Cheongju-si,

Chungcheongbuk-28220 Korea

Phone: +82-43-238-6500

Fax: +82 70 4170 4567

Aerzen Arabia Ltd.

Abed Al-Mis’hal Tower 9th Floor, office 907, Building 3958, District 35514 Al Jubail, Kingdom of Saudi Arabia


Phone: +966 13 362 8826

Service Centre - Aerzen Arabia Ltd.

Rezayat Group Dammam Port Area, Dammam Kingdom of Saudi Arabia


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