Open AWE Magazine menu
Subscribe Login

Home / Articles and Press Releases / Press Release / Sewage Treatment Plant Brought up to Date

CATEGORIES

  • Latest Issue
  • Air Quality
  • Chromatography
  • Construction
  • Climate Change
  • Emissions
  • Environmental & Monitoring Technology
  • Gas Detection
  • Health and Safety Awareness
  • Humidity & Temperature
  • Laboratory Testing
  • Land Remediation
  • Marine Pollution
  • Noise Monitoring
  • Regulations & Legislations
  • Sludge and Biosolids
  • Soil Analysis
  • Spectroscopy
  • Weather Monitoring
  • Water Analysis
  • Water Monitoring

MORE

  • Press Releases
  • Events
  • Videos
  • Magazines

COMPANY

  • About
  • Advertising
  • Newsletter
  • Contact
HSI White logo
Open AWE Magazine menu
Subscribe

Home / Articles and Press Releases / Press Release / Sewage Treatment Plant Brought up to Date

CATEGORIES

  • Latest Issue
  • Air Quality
  • Chromatography
  • Construction
  • Climate Change
  • Emissions
  • Environmental & Monitoring Technology
  • Gas Detection
  • Health and Safety Awareness
  • Humidity & Temperature
  • Laboratory Testing
  • Land Remediation
  • Marine Pollution
  • Noise Monitoring
  • Regulations & Legislations
  • Sludge and Biosolids
  • Soil Analysis
  • Spectroscopy
  • Weather Monitoring
  • Water Analysis
  • Water Monitoring

MORE

  • Press Releases
  • Events
  • Videos
  • Magazines

COMPANY

  • About
  • Advertising
  • Newsletter
  • Contact

CATEGORIES

  • Heat and Flame
  • Press Release|Gas Detection
  • Article
  • Press Release
  • Air Quality
  • Chromatography
  • Construction
  • Climate Change
  • Emissions
  • Environmental & Monitoring Technology
  • Gas Detection
  • Health and Safety Awareness
  • Humidity & Temperature
  • Laboratory Testing
  • Land Remediation
  • Marine Pollution
  • Noise Monitoring
  • Personal Protective Equipment
  • Regulations & Legislations
  • Sludge and Biosolids
  • Soil Analysis
  • Spectroscopy
  • Weather Monitoring
  • Water Analysis
  • Water Monitoring
  • Wellbeing at work

Press Release

Sewage Treatment Plant Brought up to Date

By Tsurumi

| Read Bio

Published: June 11th, 2019

Share this article

Japanese TRN submersible aerators have proven themselves in the pilot project of a medium-sized sewage treatment plant. After completion, the operator immediately placed a follow-up order and retrofitted the plant: Extensive maintenance is a thing of the past, and the energy balance is significantly improved. It is interesting to take a look at the technical background of the process.

The Klettgau wastewater treatment plant treats domestic, commercial and industrial wastewater from nine communities in the German-Swiss border region. It is located outside the town of Hallau in the canton of Schaffhausen, west of Lake Constance.

After 36 years of operation, it was decided to carry out a complete renovation. “The plant had to be comprehensively renovated, extended and adapted to the regulations,” says plant manager Werner Bringolf. It was once designed for 14,000 inhabitants. Today it is dimensioned for 21,000. A mixing channel system with a total length of 26 km ensures a dry weather intake of 6,400 m3 per day. The modernisation was completed in 2014.

Circular grit trap with grease separator

There is an aerated sand trap that removes sediment and inorganic substances from the wastewater. This is combined with a grease trap to float out grease, oil and other floating substances. The construction element was designed as a round basin into which outside air is introduced by a submersible aerator for material separation. The solids settle at the bottom of the separator cone and the light materials separate. This combined solution can be found in many municipal sewage treatment plants.

“We were not completely satisfied with the French submersible aerators,” reports Bringolf. “They often had to be serviced. In particular, the abrasive waste water caused leaks in the mechanical seal. “However, we also put the power consumption of the motor up for discussion. It is an important factor in the operating time of the plant, which runs around the clock and therefore has no downtime.

At IFAT, they turned to the pump manufacturer Tsurumi. The Japanese company is known in the waste water sector for its TRN submersible aerators. At the trade fair, the experts calculated the demand and suggested a comparatively small replacement model. “We agreed to a test installation”. Pumpen Lechner near Bilten took over the support of the customer on site.

“after 36 years of operation, it was decided to carry out a complete renovation”

Impressive maintenance situation

Hallau has two flotation tanks with a capacity of 70 m3 each. The 50TRN42.2 submersible aerator selected by Tsurumi has a rated output of 2.2 kW, rotates at 1450 rpm and weighs 140 kg free-standing. It was mounted in a grit chamber (210 cm diameter) suspended at a depth of two metres. In order to compensate the own movement of the unit by the torque of the rotor, the tube of the air supply was fixed to the tank, and therefore also the submerged aerator.

Tsurumi works with an adapted hydraulic system (60 Hz), which produces comparatively small air bubbles. A TRN offers some headspace compared to standard aerators.

After almost a year of continuous operation, early maintenance was carried out to check the condition of the unit. The competitor’s product ran parallel in the second tank.

The operator was astounded by the condition of the replacement unit: “The aerator was in absolute new condition,” emphasizes Bringolf. No wear or abrasion was detected. “Mechanical freedom of movement was given, the oil was as good as new, and the cable as well as the windings were also continuous and error-free after measurement. Even the degree of contamination was insignificant: “Nobody expected that,” he reveals.

In this respect, experts suspect a weak point in the aerator in question. If the mechanical seal had direct contact with the rough waste water, small particles could penetrate the sealing gap and destroy the sliding surfaces, reported Tsurumi. The manufacturer has therefore opted for a different concept for its submersible aerators and pumps: the double mechanical seal is located on the inside and is shielded from the abrasive medium by an air cushion during operation.

27 percent energy savings

The cleaning performance of the TRN corresponds to that of the competitor’s product – which should be the case, as both were designed to suit the operator’s requirements. Nevertheless, this point is surprising, because the Japanese aerator is satisfied with 2.2 kW motor power in contrast to the competitor with 3.0 kW. For the flotation in Hallau, this results in a saving of around CHF 2700 per year.

For the customer it was clear that the entire clarification stage was to be converted to Tsurumi equipment. The decision was made during the maintenance check. A nice confirmation for the Japanese: They offered a technically reliable solution that also saves costs for the customer. What more could you ask for?

The self-priming TRN submersible aerators are a key product of the manufacturer. The portfolio includes ten models with engine outputs from 0.75 to 40 kW. Submersible aerators work on the principle of a pump but move air instead of water. This makes them generally more fail-safe, even in long continuous operation.

Their fine air bubbles are produced according to the Venturi principle, which also sets the tank contents in motion. The aerators do not require a compressor or any structural attachment, as they are simply lowered to the ground or suspended. Only cable, air supply and holding chain are required. The manufacturer’s expertise in this field is rich: Tsurumi has specialised exclusively in pump technology since 1924, favours generously dimensioned designs and uses the hardest materials.

Air cushion protects seal

The technical meticulousness of the Japanese is remarkable. This can be seen in detailed solutions such as the individually encapsulated electrical conductors or the aforementioned internal double mechanical seal. Measures that may have contributed to Tsurumi’s rise to become the world’s largest construction pump manufacturer.

The decisive factor in protecting its mechanical seal is a centrifugal oil lifting device: a patented in-house development for lubrication and cooling that is not available on the market for other ventilators. There, the seal is cooled by the waste water, which causes it to come into contact with the medium. With Tsurumi, on the other hand, there is always a cushion of air in front of the sensitive seal when the aerator is in operation, which keeps away the aggressive waste water. Chemical substances, granular particles, synthetic fibres: they can only reach the mechanical seal to a very limited extent.

Fibres often cause problems for the impeller of the aerator. The design previously used in Hallau had an external impeller. Such a design is susceptible to impurities and deposits – which lead to imbalances, the typical consequences of which are worn out bearings. Here, too, Tsurumi takes a different approach, as the impellers are protected on the inside by a wear plate. A less susceptible design in terms of wear, clogging and plugging.

Share this article

ABOUT THE AUTHOR

Tsurumi

Tsurumi is a one-stop-shop for all your pumping needs. We have over 250 models in our range and a pan-European network of distributors.

Connect with Tsurumi

Visit Website

POPULAR POSTS BY Tsurumi

Press Release

Sewage Treatment Plant Brought up to Date

Press Release

Water Logistics for the “Industry 4.0”

Press Release

New 2018 Sewer Shaft Pump KRSU Installed for First Time

Press Release

New Highly Efficient Sewage Pump BP at the IFAT 2018 ‘Best Performance’

Press Release

Pump Quality and Safety

Press Release

Drinktec 2017 – Pumps for Water Logistics

Get email updates

Sign up for the AWE newsletter

Keep up-to-date through the power of email and receive the latest environmental monitoring product information and newsletter emails from AWE - Monitoring and Analysing the Impact of Industry on the Environment

"*" indicates required fields

Country
*
This field is for validation purposes and should be left unchanged.

FEATURED ARTICLES

Press Release

Blackline Safety and NevadaNano Reach Milestone in Deployment of Industry-First Sensors

Press Release

The Benefits of Using Refurbished Parts in Your Lab

Advertisement

SOCIAL MEDIA

AWE on Facebook

https://www.facebook.com/AWEIMagazine/

Advertisement

SOCIAL MEDIA

AWE on Twitter

Avatar AWE International Magazine @aweimagazine ·
25 Jan

Soil is a vital component of natural capital, hosting rich biodiversity and providing critical ecosystem services, such as food production, water purification and carbon storage.

Read more from the @EUEnvironment here:
https://www.aweimagazine.com/press-release/monitoring-soil-threats-in-europe/

#aweinternational #EEA #soil

Reply on Twitter 1618284319327543296 Retweet on Twitter 1618284319327543296 Like on Twitter 1618284319327543296 Twitter 1618284319327543296

Advertisement

SUBSCRIBE

Stay up to date with our newsletter

    • Keep up-to-date with Europe’s largest audited environmental monitoring magazine

 

    • Delivering the latest information on new products and emerging technologies related to industrial environmental monitoring.

 

This field is for validation purposes and should be left unchanged.

Subscribe

SUBSCRIBE TO AWE MAGAZINE

5 reasons to subscribe to our digital and print package

  • Stay up to date from anywhere in the world, with instant access to the latest issue straight from your phone, tablet or laptop.
  • Trust that you’re getting the best content from our range of internationally accredited authors.
  • Get full access to our archives and see how the environmental monitoring landscape has evolved with us over the years.
  • Enjoy our monthly newsletter curated with up-to-the-minute news and a selection of editor’s top picks.
  • Hot off the press and straight to your door – look forward to your own glossy copy of AWE, delivered five times a year
Subscribe View Subscription levels

STAY SAFE & INFORMED

Subscribe to the latest environmental monitoring articles, news, products and regulations

Find out more

Stay up to date with our newsletter

  • This field is for validation purposes and should be left unchanged.

ABOUT

  • About AWE
  • Advertise
  • Contact Us

YOUR ACCOUNT

Sign In Register Account Subscribe to AWE

RESOURCES

Request Media Pack

CONNECT

ACCREDITATIONS

Copyright Bay Publishing 2023. All Rights reserved.

Designed & Built by:
  • Terms & Conditions
  • Privacy Policy
  • Cookie Policy
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Cookie settingsACCEPT
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT