Production d’eau potable et traitement des eaux usées

Unique : La variété des technologies AERZEN

Production d’eau potable et traitement des eaux usées dans une station d’épuration

Il existe de nombreuses options pour appliquer des méthodes permettant d’éviter de porter atteinte à l’environnement. Dans le cas des eaux usées, il s’agit par exemple de l’aération du dessableur-déshuileur ou de l’aération sous pression des systèmes de traitement biologique. L’apport adéquat d’oxygène est déterminant, peu importe si le bassin d’eaux usées est ou non très profond, ou si le traitement des eaux est réalisé par lagunage.

Si les eaux usées ont déjà été réintroduites dans le cycle naturel, l’aération des lacs et des rivières empêche une pollution supplémentaire des eaux. Lorsque de la production d’eau potable, le nettoyage des filtres avec de l’air comprimé garantit qu’une eau parfaite soit fournie et que les réserves en eau naturelle ne soient pas surexploitées.

Le gaz produit dans les décharges, sur les sites, ou dans les digesteurs d’enfouissement, ainsi que le gaz de digestion produit dans les stations d’épuration, ne s’échappe plus directement dans l’environnement et n’est donc plus brûlé inutilement. Il est utilisé de façon durable pour produire de l’énergie, soulager l’environnement et pallier les déficits de ressources. Du fait de l’augmentation de la pression obtenue grâce aux surpresseurs biogaz, le gaz est transporté vers des centrales de cogénération CHP ou des générateurs où l’énergie transformée peut par exemple être utilisée pour chauffer des bâtiments ou des serres. Le gaz produit est mesuré au moyen des compteurs de gaz à pistons rotatifs AERZEN.

Lors de la phase de séchage des boues, les surpresseurs à pistons rotatifs AERZEN peuvent être utilisés pour le transport pneumatique des boues séchées.

Les produits AERZEN ne sont pas uniquement performants pour effectuer les travaux susmentionnés. Il y a de nombreuses façons de protéger de l’environnement, et donc de nombreuses applications des surpresseurs à pistons rotatifs, des compresseurs à vis et des turbocompresseurs AERZEN.

Performance3. Régulation précise des cycles de charge.
Performance3. Régulation précise des cycles de charge.

Performance3. Régulation précise des cycles de charge. Pour une efficacité accrue dans les process d’aération de bassin.

La variation du besoin en air dans les bassins d’aération, les spécifications techniques et celles de construction sont des défis pour la technologie d’aération de chaque station d’épuration. Le résultat : une consommation d’énergie extrêmement importante qui peut représenter jusqu’à 80 % du total des coûts La solution : des associations innovantes de surpresseurs, de turbocompresseurs et de compresseurs à vis Hybrid AERZEN. Efficacité énergétique maximale pour la charge de base, ajustements précis pour les charges maximales. Le résultat : une efficacité énergétique jusqu’à présent inégalée pendant toute l’exploitation. Le retour sur investissement est déjà obtenu au bout de 2 ans !


AERsmart

Des performances encore meilleures dans les bassins d’aération

Efficacité optimale en matière de surpresseurs, profils de charge en adéquation, et fonctionnement nettement plus efficace des stations d’épuration — le nouveau système de commande machines AERZEN rend cela possible.

Projet de récupération de chaleur

RÉCUPÉRATION DE CHALEUR

Réduit les coûts de production d’air comprimé

Dans les villes et les municipalités, les stations de traitement des eaux usées sont les installations qui consomment le plus d’électricité. En raison de l’incertitude sur l’avenir du mix énergétique au niveau mondial et des prix des énergies qui en résultera, il y a un besoin urgent d’améliorer l’efficacité énergétique.

Études de cas

EN AVANT, METTEZ VOS RÉTICENCES DE CÔTÉ !

AIR EFFICACE POUR LES USINES DE TRAITEMENT DES EAUX USÉES

Lorsque des stations d’épuration nécessitent une rénovation, la limitation réglementaire de plus en forte des teneurs maximales en ammoniaque, en nitrates et en phosphates pousse à prendre la décision d’investir. Si cela est une question de budget, au regard de la protection du climat et des finances, cela vaut la peine d’inclure l’efficacité énergétique dans les plans ;

Turbocompresseur et surpresseur à pistons rotatifs AERZEN sur la station d’épuration de Kötz

AERZEN assure la production d’air process avec un minimum d’énergie

L’histoire d’une réussite — l’usine de traitement des eaux usées Koetz

L’usine de traitement des eaux usées de Koetz a choisi la solution idéale pour la production d’air process : la configuration associant des turbocompresseurs AERZEN pour la charge de base et des surpresseurs à pistons rotatifs ou des Compresseurs à vis Delta Hybrid pour la charge maximale délivre avec fiabilité et à moindre coût l’air process aux bassins d’aération de la station d’épuration biologique.

Wastewater Treatment with Blower Technology from AERZEN

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.

Why Choosing the Right Blower Technology is Crucial in Wastewater Treatment

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 ventilation of an active sewage treatment basin 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.

What Technologies are Available, and What are the Advantages?

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.

When is a Combination of Different Blower Components Worthwhile?

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".

How Can I Find the Most Sustainable and Cost-Effective Solution for my Needs?

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.

Various Applications - Precise Solutions

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 basin, 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.