Why to choose a decetralized sewage plant and not septic tank only? 

What does it look like? Concrete or plastic tank well insulated and accessible for sludge collection/disposal Tank with more chambers and possibly ground filter to final cleaning of water before release Tank with more chambers which represent the most effective way of wastewater liquidation
How to empty it? No outflow, frequent sludbe collection/disposal Outflow of repeatedly cleaned water, sludge collection/ disposal Possibly to re-use the treated sewage water ( flush a toilet, water the garden), sludge collection/disposal
Where to use it? Used in less frequently objects/ buildings without sewage connection Short-term used objects (cottages, chalets) or family houses Permanently lived in objects/building up to 500 PE/1000 PE
Advantages Low acquisition price, no water analysis necessary Relatively low price, no electric power necessary, less frequent sludge collection/ disposal than from a cesspit Optional eco mode (night, holidays etc.) controlled by a control unit. Re-use of cleaned water in the house. High efficiency without final treatment. Smaller space for the contruction (SBR plant). Regular monitoring of the WWTP operation can be solved by online telemetry systems
Disadvantages High operation costs / disposal Bigger space for the septic tank construction, final repeated water treatment is necessary Higher procurement costs but guaranteed return on investment. Electricity consumption



Wastewater treatment in Lithuania at the present

At present, Lithuania, Latvia and Estonia, Baltic countries with almost 6 million inhabitants, deal with wastewater treatment as much as the pioneers in the decentralized sewage treatment plants, Germany or France.

As Aušra Mažeikienė and Rasa Vaiškūnaitė, the authors of the original research "Analysis and Assessment of Biological Treatment Processes in a Small-Scale Wastewater Treatment Plant" claim: "In recent years the variety of different types of small-scale household wastewater treatment plants produced in Lithuania and abroad has increased considerably within the country.
With stricter requirements for wastewater treatment, small-scale individual wastewater treatment plants can provide a financially attractive alternative to a sever connection in locations far from the existing sewer network. Systems operating under the basis of active sludge are considered advanced, and their producers declare high levels of wastewater treatment not only according to BOD, but also under biogenic materials."

In order to help WWTP manufacturers particularly in Lithuania, in February 2019, BIBUS Baltics and BONNEL TECHNOLOGIE realized a special knowledge-exchange tour highlighting the importance of WWTP monitoring and its effective operation. During the three-day tour of the Baltic countries, both partners visited four local WWTP producers of continuous plants.

Dipl.-Ing. Jan Bonn, managing partner of the Czech manufacturer of electronics for sewage treatment, points out: "We had a unique opportunity to meet wastewater professionals in Lithuania, who implement decentralized sewage treatment plants for communities and households not connected to sewage systems. Since the local manufacturers have to face ever stricter legislation here, they were very interested to learn more about our Sequetrol® starter controllers which can assist the owner and the service staff and provide better cleaning results, especially when it comes to denitrification. We have also introduced the idea of "smart home" with our free, smart GSM monitoring application Aquavisor and our IoT product range.


Smart decentralized wastewater treatment may be an attractive, cost-efficient and ecologically friendly improvement for small communities and individual homes in the Lithuanian countryside.



BONNEL at the conference on rainwater and wastewater treatment

On Tuesday, January 29th, professionals from Germany and from other countries met on a one-day conference on "Rainwater and wastewater treatment - technology status and outlook". BONNEL TECHNOLOGIE, which focuses on development and manufacture of smart controllers for decentralized sewage treatment plants, represented the Czech sector. In the BONNEL portfolio for 2019, a brand new control unit marked IoT will be launched. It will include a long-distance monitoring of decentralized WWTPs using an integrated webserver and Wi-Fi connection.

Jan Bonn, BONNEL CEO, summed up the latest technological trends: "The climate and the weather have been changing. In the future we have have to count on strong discrepancies - heavy rains and long spells of dry weather even in Central Europe. That is why the trend of smart rainwater use with long-distance monitoring devices for rainwater retention is coming into question. At BONNEL TECHNOLOGIE we are ready to support our partners, manufacturers of decentralized WWTP, with smart monitoring control units and software."

BONNEL TECHNOLOGIE and its highly skilled development team have been working on electronics for future smart homes which shall represent a comfortable solution for house owners, users and service companies. It shall provide a quick access to information about the operation of their devices.

More about our development here.



Efficient and sophisticated operation of decentralized wastewater plants

In 2006 BONNEL TECHNOLOGIE, a Czech manufacturer of electronic and mechatronic devices, stepped into the branch of wastewater treatment. BONNEL technologies of the present aim at the IoT solutions for decentralized sewage treatment plants of tomorrow. Smart controllers, which are developed and manufactured with 100% quality assurance in the Czech plant in Cheb, ensure efficient and sophisticated operation of WWTPs. Globally, countries, communities and individuals search for environmentally friendly, sustainable and online accessible solutions for operation and monitoring of their decentralized plants.

BONNEL IoT controls designed for SBR plants

Sequetrol IoT, a flagship in this segment, can be operated by phone/ tablet/ touchscreen via browser.

You can connect this powerful smart control unit to the world of PLC/ SCADA via HTTP-REST.

It allows the user to program the process and menu with a fast PC tool MenuMaker 4. The controller measures water level in the decentralized sewage plants by pressure sensing. In addition, it can offer current measurement as an option, max. 8 relay outputs, 3 digital inputs, 4-20mA analogue input etc.
More details here

In 2019, BONNEL will launch an new IoT control unit with integrated, stepper motor actuated valves, quiet and reliable in operation. Read more about BonBloc IoT soon!

Owners (private and public entities) and service staff can benefit from remote control and monitoring of the WWTP operation. BONNEL TECHNOLOGIE offers smart apps and advanced telemetry systems for this purpose. The IoT controllers have already been installed in many European countries. Moreover, BONNEL partners in countries, where decentralized wastewater treatment prevails, such as India, also implement IoT controllers in order to control and to supervise efficiently the treatment process worldwide.

Inquire about IoT control units for your decentralized sewage treatment plant at This email address is being protected from spambots. You need JavaScript enabled to view it.



Do you change your summer cottage for a mountain chalet in winter?

How can you adjust your sewage treatment plant for winter operation?

A biological SBR plant is already adjusted for this operation when it will be switched to an eco mode or even turned off from the inflow. Thanks to a control unit, the plant can be set up for winter months with a decreased inflow of effluent. It is necessary to keep the biological fuction of the plant. It means to protect live microorganisms in the tanks even without aeration and „feeding“.

Our partner TopolWater tested and operates its SBR plants with control units in demanding climatic conditions in Sweden and the company claims: „The operation has been tested under the conditions that a fully running plant was turned off from the inflow and after three months´ operation there was still 70 per cent of microorganisms present in the WWTP. According to the partner´s information from Sweden, even though the WWTP Topas 75 had been running 4 months in the winter time without any effluent, its biological function was preserved.“

At low temperatures technologies cannot freeze if they are in operation. If your plant is equipped with a control unit, our partner advises you to set up manually the operation which will make the wastewater circulate permanently and the blower will not switch off automatically.
Christmas season can mean a great load for your decentralized sewage treatment plant. WWTP manufacturers strongly recommend to avoid pouring the substances listed below into your plant.

They cannot be processed or even more they can be very harmful for your sewage treatment plant:

  • oil
  • strong lye (used in dishwashers), solvents
  • chemicals and disinfectant liquids (concentrated or not biodegradable)
  • food
  • sanitary items



Smart concepts in decentralized sewage treatment

Smart solutions help wastewater professionals and customers in domestic sewage treatment.
With over one decade of experience, BONNEL TECHNOLOGIE provides versatile and tailored solutions for modern, efficient wastewater treatment in the areas which are not linked to central sewage systems. At present, IoT technologies significantly contribute to the increased quality and value of service.

Who are our customers?

Manufacturers, service companies, municipalities

In order to ensure smooth development and production for our customers, we
provide an initial analysis

  • draft possible tailored solutions
  • develop and produce hardware, the firmware and the software containing the menu and process in house
  • test samples on site/ in our test lab and
  • consult their implementation at the customer´s plant.

Following the latest IoT trends, we improve our control units continuously. These smart concepts involve IoT controllers, smart applications and smart telemetry solutions including database and web-viewers. BONNEL control units enable the plant operators and users a more comfortable, highly efficient and better quality of plant operation. At the same time, our IoT control units fulfill the ever-stricter legislation.

How will you benefit?

  • A complex smart solution tailored for your plant
  • Access to the plant data in your mobile phone, tablet or notebook at any time
  • Limited operational costs
  • Professional service support

Where can you find our IoT solutions?

  • Germany
  • India
  • Greece
  • Romania
  • Norway

Do you need more information?

Contact our Sales team at This email address is being protected from spambots. You need JavaScript enabled to view it.



Interview with Jan Bonn about the market trends in France

At the beginning of our interview with Mr. Jan Bonn, managing partner of BONNEL TECHNOLOGIE and professional in wastewater treatment (WWTP), we should be aware of the following facts:

At present there are 65 million inhabitants in France. In some regions without any sewage system, the French use decentralized sewage treatment. What is the current status in this branch?
Which types of decentralized sewage treatment plants can be found most frequently in France? Most frequently we can find biofilter sewage treatment plants or simple MBBR plants.

Which trends have you noticed during your October trip to the international fair in Dunkerque?

At the fair we noticed a great interest in monitoring of decentralized sewage treatment plants in particular regarding applications which have not been monitored until now. These are solutions with biofilter as well as simple MBBR plants. This monitoring should be ideally integrated into the "smart home" concept, the overall digital and long-distance monitoring of your home. In addition, applications for mobile devices, which enable to organize and optimize service trips more efficiently, were in focus.

Which trends has France followed in decentralized wastewater treatment recently?

In contrast to the Czech Republic or Germany, a solution based on biofilters is spread a lot in France. The fact is that in France their effluent values (= quality of water treatment) are often better than those of simple continuous sewage treatment plants without control unit. However, this solution is financially more demanding. MBBR plant manufacturers aim to offer intelligent concepts and control units which increase reliability and performance of these WWTP so that they can compete with biofilter-based plants.

How do biofilter producers respond?

This group of manufacturers tends to integrate monitoring and electronic solutions, which simplify the detection and analysis of failures, into their sewage treatment plants.

In which aspects do France and the Czech Republic differ significantly?

The Czech Statistical Office states that in 2016 the ration of sewage system coverage in the Czech Republic is 84.7%. In the capital city of Prague and in some regions, it is even higher than 90%. This ratio sets the conditions and regions where domestic sewage treatment plants can be used.

The overall situation in the Czech Republic and in France does not differ that much. The usage of decentralized WWTPs is limited in both countries by the fact that their types are tested only in testing institutions under laboratory conditions. For the real operation, often no explicit or neutral analyses of treated water are required. As a result, the end users do not obtain any information or overview which WWTP has which performance. The key factor for purchasing a WWTP is, therefore, its price.

The Czech Republic and France respond to this fact in a different way. The Czech Republic has announced an invitation to tenders which offers a subsidy program for decentralized WWTP under the condition that the municipality can prove that its WWTP has been cleaning wastewaters reliably for over 10 years. This approach is neutral, and it makes sense. A WWTP can reliably treat water for at least 10 – 20 years! However not all models. The cheapest ones often fail to do so in the day-to-day operation. Due to the financial possibilities from the subsidies and the project responsibility, municipalities have an opportunity to choose a WWPT which will provide a real contribution to environmental protection.

The French government subsidizes the WWTP types that have been proven successful on the French market and it means the subsidies go to WWTPs with a biofilter. At the first sight it is a logical but not neutral approach. In fact, it puts restraints on the development of quality technical WWTP which demonstrate good performance and excellent results of effluent water for example in Germany. In addition, compared to the WWTP with a biofilter they have a number of other advantages. In my opinion what makes a good functioning WWTP is its quality, intelligent design, suitable control units and service, not its type. Each customer / application case requires a tailor-made approach and some technologies are better suited in one case, some in another case.

BONNEL TECHNOLOGIE as a manufacturer of control units does not supply France directly. What are the advantages of working with a distribution partner?

The benefits are definitely their language knowledge, local market knowledge and options of service support. Our partner, the BIBUS company, offers control units made by BONNEL TECHNOLOGIE as well as SECOH blowers /air pumps, one of the most widely used high quality blower in the market. The BIBUS team has a wide portfolio of customers and they also demonstrate great know-how about systems of decentralized wastewater treatment.



Select the right battery – Ensure reliable operation of your control unit

The control units made by BONNEL TECHNOLOGIE, which monitor reliable operation of your decentralized sewage treatment plant, are complex electronic devices. In general, control units in continuous and SBR plants are exposed to demanding conditions. Among others the following operational parameters are crucial: 

  • Maximum temperature of WWTP ambience 50-55°C
  • Batteries have to be of the right dimensions, capacity and type.
  • Another criterion for their selection is re-charging through permanently low current.

BONNEL TECHNOLOGIE as a manufacturer of control units regularly checks and tests suitable battery types available on the market. Based on our experience we generally recommend:

  • Type of the battery: Ni-MH
  • Size: AA, HR6
  • Capacity: ≥ 1800 mAh
  • Execution: Suitable for permanent recharging with low current

Upon request with every control unit purchased we can supply 1 or more pieces of batteries.

You can buy the rechardable batteries in specialized shops, order them from your KKA supplier or from us.


Description for your order by BONNEL TECHNOLOGIE:

99591929 Energizer NiMh AA ACCU-R6/2000-EG 1,2V/2000mAh

Technical specifications of this accumulator: Datasheet or



Stay connected with the Sequetrol® IoT !

A comfortable IoT solution for your decentralized sewage plant

Do you operate or own decentralized sewage treatment plants?
Have you ever wondered if you could monitor your WWTP from your office or home?

The new Sequetrol® IoT designed and manufactured by BONNEL TECHNOLOGIE can offer you a reliable and comfortable solution. You can operate the controller by a smart phone, a tablet or a touchscreen via any selected browser. No need to install any additional application. The new Sequetrol® IoT contains an integrated webserver. Moreover, you can receive instant SMS messages and alarm emails about the status of your sewage treatment plant.

Choose the best option for you

  • If you have a Wi-Fi router, which allows a VPN connection to that router and/or supports DDNS + port forwarding – the Sequetrol® IoT can be remote controlled and send alarm e-mails.
  • If you have a Wi-Fi router, which does NOT allow a VPN connection to that router – the Sequetrol® IoT can still send alarm e-mails. 
  • If you have VPN SIM cards – the Sequetrol® IoT can be remote controlled and send alarm e-mails.
  • If you have only a normal SIM card (2G) – the Sequetrol® IoT can still send alarm e-mails.

In winter-spring 2019 we are introducing a new solution based on MQTT. This is a widely used technology, for example by Facebook messenger. It will allow you to remote control and operate your Sequetrol® IoT from anywhere via GSM or Wi-Fi without the need of VNP.

We will keep you updated…

Order a test sample at This email address is being protected from spambots. You need JavaScript enabled to view it.

Read more about this control unit at



ForArch - Matchmaking Business Meeting

an opportunity for Czech companies to find new partners

On Friday, September 21 during the 2018 FOR ARCH Fair a bilateral discussion platform called „Matchmaking Business Meeting“ (MBM) opened up for companies. The 6th MBM attracted to Prague almost eighty companies from 16 countries for B2B sessions. BONNEL TECHNOLOGIE, which designs and manufactures among others control units for decentralized sewage treatment plants for the „smart home“ segment in its Cheb plant, used this opportunity to build new relationships with foreign clients.

Jan Bonn, company CEO, confirmed: „The Matchmaking Business meeting was a brand new experience for BONNEL TECHNOLOGIE since we participated for the very first time. We welcome similar types of presentations for local and international partners. They give us a change to present our product and its functionalities, answer any questions and suggest specific bilateral co-operation.“

And he added: „At the 2018 FOR ARCH Fair we also had an opportunity to visit our partners´ presentation stand. We could see the interest our complex telemetry solutions awoke among visitors. This monitoring will make the work easier for service companies and municipalities which service regular operation of decentralized sewage treatment plants.“

On a long-term basis, BONNEL TECHNOLOGIE has been co-operating with the European Enterprise Network and its professional consultants when presenting its competences abroad.

Read more information at

How to choose a control unit for your WWTP

When you go shopping for clothes or shoes, there are some basic information you will need to get the right jacket or a fitting pair of shoes. In order to choose the right control unit for your domestic sewage treatment plant, you will need to answer some basic questions, too.

Try our 10 GUIDELINES to help you:

1. What WWTP type do you have? SBR, MBBR, Fixed-Bed or any other?

BONNEL TECHNOLOGIE can offer you customized control units for almost all types. Read more HERE.

2. How many valves do you need for your WWTP?

At BONNEL we offer four-valve stepper motor manifolds or control units with integrated stepper motor valve units for SBR (BonBloc® series). To all our control you can also connect solenoid valves and our latest smart control unit Sequetrol® IoT can control up to seven valves.

3. How many 230V outputs (=relays) do you need?

You can use them to operate the blower, valves, submersible pumps, dosing pumps, UV-lamps, alarm lamps, …

4. How will you measure the water level?

By a float switch or a pressure sensor (SBR plants only)? This specification is crucial for your future control unit.

5. Which alarms can be a useful help for your staff or customers?

We can monitor: Mains failure. Fuse error. Overfill. Pressure. Current. Monitoring of the valve function. Do you wish to have a multiple login for more members of your staff? Ask us at BONNEL TECHNOLOGIE.

6. Will you need an event protocol?

Legislation and regulations in some countries may require one.

7. Do your staff members or customers speak no English?

Would you like to have another language for the menu? Make the usage easier for your staff and customers in their mother tongue if available. There is also another option. BONNEL can provide the texts and you may translate them.

8. Is the decentralized sewage treatment plant to be aerated 24/7 or do you wish to operate it more ecofriendly – load dependant?

If so, ask for additional programmes, such eco- or holiday modes.

9. Do you have skilled staff who are able to design your own customized software?

Then, you can choose out of three options to design or modify your proces: Excel for quick and easy adoptions on our entry-level control units, MenuMaker for sophisticated programs and menu structures or DataBuilder for continuous plants.

10. Are you going to use the best of high-tech and IoT technologies in your plant?

Look into the latest GSM options with Aquavisor app and telemetry solutions. Ask us about the integration of wifi or webserver. 

And there is much more we offer at BONNEL TECHNOLOGIE, such as tailor-made solutions for different countries and customers, professional technical consultancy five days a week.

You can find a complete portfolio of BONNEL control units on our homepage. Request your personal guidelines and choose the control unit with this great information kit wisely and efficiently, contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. 

How to take good care for your control unit

Do you have a family house, a weekend cottage or a challet? Do you have to deal with a location without a central sewage system?
Have you decided to benefit from modern decentralized sewage treatment plants which can enable you to re-use the treated water efficiently in your house for flushing the toilet or watering your garden?
Is a control unit part of your WWTP? Does it monitor its operation 24/7 and does it work in the eco and holiday modes? Does it prevent sludge from settling and smelling?

We asked BONNEL technicians how to keep your control unit – the brain of your WWTP – in the best shape for the longest time possible.

1. Install the device into suitable location.

Your control unit should be

  • Outside your WWTP (or)
  • In the well-aired space inside the WWTP
  • Sufficiently high above the terrain to prevent a snowfall, flooding or dust from coming in
  • In dry space – humidity can cause corrosion of electrical parts
  • In a closed and well-aired object/box/pillar/wooden box. The blower will need fresh air not the air from WWTP.
  • Inside, not in the direct sun. The control unit cannot be exposed to temperatures permanently exceeding 45-50 degrees Celsius. In the southern part of the control cabinet these values can be reached easily. 
  • Good access for the service staff and the owner
  • No access for unauthorized persons and children

2. Check the control unit regularly – visually and by listening to it

Check once a week if your control unit sends any alarm.
Check if the WWTP smells like „rotten eggs“. This odour near the control unit may signal faulty functioning of your WWTP. These gases may cause corrosion of your control unit (electrical components) and the concrete tanks, too.

3. Take preventive care and maintain your WWTP regularly

Follow instructions and recommendations given by the producers regarding preventive maintenance.
Prevention and good care are two important steps to a reliable operation of your control unit and your WWTP.

If you have any questions, please do not hesitate to contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

Innovations in the monitoring of sewage treatment plants

Not only in our everyday lives but also in a branch such as wastewater treatment there is a demand for cost-effective, quick and accessible solutions. BONNEL TECHNOLOGIE brings smart technologies and remote access as a great bonus for decentralized sewage treatment plants. For a service company or a community that have no access to a centralized sewage system, BONNEL telemetries offer a comfortable solution. Moreover, a control unit equipped with monitoring and remote control opens the door for new approaches for the operation and servicing of a higher quantity of plants: Automatic service planning and billing, sewage treatment as a service (XaaS), public-private-partnerships (PPP) any many more.

The data about individual wastewater treatment plant (wwtp) facilities for the headquarters and the staff in the field are available in real time and accessible from any place.

What data are available?

  • Alarms
  • Events (i.e. manual operation, last service, blower change)
  • Contact data of the plant owner / responible
  • Location of each wwtp including GPS coordinates and navigation

What are the evident benefits for the maintenance staff on duty?

  • Continuous overview of all the plants
  • Quick reaction time to individual problems
  • Job planning for individual plants
  • Cost-effective planning of service trips

Interested in a tailor-made telemetry solution?

Please contact the BONNEL sales team at This email address is being protected from spambots. You need JavaScript enabled to view it. or check out our free telemetry app for our entry-level SMS telemetry system here.



4 reasons why you should use telemetry systems for your sewage treatment plant

The digital age and the concept of "smart cities" and "smart homes" have brought changes to the rigid field of wastewater treatment. Authorities and individual owners of sewage treatment plants no longer wish to wait for hours and days. They want to be informed continuously about their operation and be ready to tackle technical issues just in time. There are 4 good reasons why BONNEL telemetry systems are an invaluable tool for the WWTP monitoring now and in the future.

Monitor your sewage treatment plant 24/7

Embrace the IoT era and monitor your WWTP from your office, home or elsewhere thanks to BONNEL telemetry systems online. You can look up any details about your plant and its operation.
You can even pre-set the monitoring intervals when your WWTP will be called and asked for a status report. No need to wake up in the middle of the night, our telemetry system will automatically contact the plant and store the data for you. Sleep well while your service takes care. BONNEL telemetry systems can always guarantee a good operation.

Optimize your maintenance costs

Telemetry systems can make you some serious money. How, you may ask? BONNEL telemetry will help you schedule your service staff visits on sites and maximize their efficiency. Thanks to the SMS messages you will be informed of failure descriptions in advance. So, you can optimize business trips and save transportation and labor costs.

Monitor the whole network

Another good news is that you can include all your plants in the telemetry network at once. So, less paper work if you are a municipality with a high number of WWTPs. It will also foster trust among your fellow citizens - users if your service works flawlessly and if you keep them engaged in the community and ecology. If applicable you can even facilitate an operation model (BOOT, BOT...).

Report the data according to valid legislation

In many countries round the globe, environmentally friendly sewage treatment comes into focus. As a result, numerous legislations become stricter and they require accurate reporting from your WWTP. Go with the telemetry flow and provide precise reports on your WWTP operation to the local and national authorities.

If you wish to learn more about telemetry benefits, please contact our Sales team. We will be happy to schedule a presentation of BONNEL telemetry systems and share with you the best practices e.g. from Germany or Czech Republic.