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Czech town welcomes wastewater treatment installation

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Construction & Commissioning, Water & Waste Water
Czech town welcomes wastewater treatment installation

A new wastewater treatment system installed in a town in the Czech Republic will protect valued fishing ponds and raise the quality to required EU environmental standards. Packaged wastewater treatment plant provider WPL installed a below-ground system in Klimkovice, in the country’s Moravian-Silesian region, as part of a municipality-led project to construct a first-time sewerage network to serve 340 of the town’s residents.

Some 110 properties will connect to the new system, replacing ageing septic tanks that had been seeping into streams which flowed into the popular fishing ponds, impacting the quality of the waters, which have protections under the EU’s Water Framework Directive. The project was welcomed by the local community and its successful completion marked with an opening ceremony.

Frantisek Lindovsky, WPL’s manager for central Europe, said: “It was the municipality’s aim to protect the ponds and provide a clean and healthy environment for the fish, which is why the decision was taken to invest in a new sewer network and sewage treatment plant. WPL’s technology was considered the most suitable because our treatment units are modular, compact and ready-to-use.

“The completed system, which will be fed by the town’s new sewer network, will significantly improve the quality of the local streams and fishing ponds and ensure they meet the environmental standards set out by the EU.”

The project team had to overcome significant challenges caused by high groundwater levels, which hindered installation of the treatment tanks.  To manage this, engineers built a temporary well so that water could be continually pumped out and levels kept down throughout construction.

The installed treatment plant – WPL’s Hybrid-SAF biological system – comprises units designed to control chemical oxygen demand (COD), biochemical oxygen demand (BOD) suspended solids, and ammonia. A remote monitoring system was also installed.  The high environmental standards required included 30mg/l BOD, 110mg/l COD, 40mg/l suspended solids and 20mg/l ammonia.

To protect the below-ground units from excess groundwater the excavation was fully backfilled with water-resistant concrete.  A small biological pond was also constructed by a municipality-sourced supplier to provide tertiary treatment and extra capacity was built into the system to cater for population growth. The scheme was financed by the EU Cohesion Fund, which aims to promote sustainable development, and the Ministry of the Environment of the Czech Republic.

The mayor of Klimkovice, Jaroslav Varga, said: “The area’s fishing ponds are used for fish farming as well as leisure, so it was important to protect them.  Installation of the project was executed without any problems and WPL worked with us very proactively. We’re happy they will assist us in the first few months of operation.”

Lindovsky said: “The mayor considered this to be a very successful project because it was on time and within budget and they wanted to celebrate completion with drinks and a speech. As wastewater treatment specialists it is very satisfying to see the pride taken in the new system and the level of appreciation for the environmental benefits it will bring.” The site will be managed by the municipality with WPL providing supervision and support.

Construction & Commissioning Measurement, Instrumentation, Control & Automation News

New diode laser spectrometer with optimum combustion control

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Yokogawa Electric Corporation plans to launch its newly developed TDLS8200 tunable diode laser spectrometer as part of its OpreX™ Analyzers product family on May 6, 2021. The new product features the same low installation cost, high measurement stability and high reliability as its predecessor, the TDLS8100, and can simultaneously measure oxygen, carbon monoxide and methane gas concentrations directly and at high speed.

Development background

Excess air supplied during combustion control in heating furnaces absorbs heat in the furnace before exiting through the exhaust stack. This not only leads to heat loss, but can also generate large amounts of nitrogen oxides and sulfur oxides, which are a major cause of air pollution. On the other hand, if there is insufficient air supply, complete combustion does not occur, resulting in energy losses, emission of carbon monoxide and black smoke, and residual methane. Carbon monoxide and methane are flammable gases that can easily form an explosive mixture with air if they accumulate in a furnace. Therefore, in oil and gas, electric power, iron and steel, petrochemical, and ceramic plants, the concentrations of oxygen, carbon monoxide, and methane in furnaces must be monitored to ensure an efficient, environmentally friendly, and safe combustion process.

Features

1. Efficient combustion and high safety through stable, simultaneous measurement of oxygen, carbon monoxide and methane.

The main feature is the dual laser light source and optics, which enables simultaneous measurement of oxygen, carbon monoxide and methane concentrations for efficient combustion control. The direct measurement system is based on the use of lasers, which are easier to maintain than conventional sampling systems and more robust than catalyst-based sensors. This provides stable, simultaneous and lossless measurement of oxygen and carbon monoxide concentrations.

 

2. Easy replacement of sampling systems

The new product is an easy-to-install diode laser spectrometer with in-situ probe. Existing sampling systems can be quickly and easily replaced, which can be installed at the same port as the previous instrument. Since sample collection or preparation systems are unnecessary, little floor space is required.

 

3. Planned second version for measurements in environments with temperatures up to 850°C.

Available May 6, 2021, the spectrometer is designed for high temperatures of 600°C, making it ideal for use in boilers and exhaust ducts. A second version of the TDLS8200 for measurements at temperatures up to 850℃, such as when used in heating furnaces, is scheduled for release later this year.

Laser-based gas analyzers from Yokogawa

Yokogawa’s laser-based gas analyzers operate on the principle of tunable diode laser spectroscopy (TDLS) for concentration determination in gases. They offer best-in-class real-time performance because they are installed on channels and do not require a sampling system, so they can measure concentrations directly and at high speed. They use a spectral domain method that calculates gas concentration from the area in a light absorption distribution pattern – enabling accurate and stable concentration measurement even in an environment with temperature and/or pressure variations or in the presence of other types of gases or large amounts of dust.

Since their launch in 2008, Yokogawa’s laser gas analyzers have gained worldwide acceptance for their high reliability and performance in even the most challenging environments. Previously, Yokogawa had two models in its lineup: the TDLS8000 and the TDLS8100. The former is equipped with a separate laser light source and detector and is suitable for concentration measurement in high-temperature and high-pressure gases, even with high dust levels. The TDLS8100 is capable of measuring the concentration of gases whose flow rate ranges from 1 to 30 meters per second. With the addition of a third model to this series, simultaneous measurement of multiple gas types is now possible.

 

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Construction & Commissioning News Quality Management

New pusher centrifuge with multiple functions

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The new producte of the company ANDRITZ has only one motor for both functions, thus significantly reducing installed power and power consumption. Pusher centrifuges with two motors generally only require the full power of the drive motor during the start-up process, and the drive motor usually operates at partial load during steady state operation. Conversely, the pusher motor runs at virtually no load during machine start-up because there are no solids in the machine yet to be pushed. Hence, the pusher motor does not operate under load until stationary operation begins.

 

Therefore, it allows the reserve capacity available for pushing to be used for accelerating the basket during the start-up process, while the reserve capacity available for the start-up process can be used for pushing during stationary operation. This results in significantly lower installed power and a motor that operates in the optimum efficiency range at all times. Total power consumption is thereby reduced by around 10 to 20%, while the installed power is reduced by around 20-40%. Furthermore, the new high-pressure pushing system cuts hydraulic fluid use by up to 40%.

 

The new pusher features innovative technologies such as the GentleFeederTM wear-reducing feed system, the PreFiltration technology for integrated thickening as well as the unique cartridge technology to reduce downtime. With this system, the entire rotating unit can be pulled out of the centrifuge in one piece without having to detach the machine’s pipework, with the result that operations are generally down for less than a single shift. What’s more, the baskets in an ecoOne pusher centrifuge are designed so that the centrifuge can easily be converted from two-stage to three-stage design and vice versa. This gives the centrifuge unrivalled flexibility because the design can be adjusted as upstream requirements change or if the centrifuge is used for campaign-based operations.

 

Suitable for bulk chemicals, technical salts and agrochemicals as well as plastics production, the latest innovation of the company retains the reliability and washing efficiency of traditional pusher centrifuge technology while increasing energy efficiency, flexibility, and ease of maintenance, thereby reducing operating costs and downtime. In addition, the weight of the ecoOne pusher centrifuge is significantly lower and its space requirement and environmental footprint are substantially smaller than those of previous generations.

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Construction & Commissioning

Songflame
Songwon expands its range

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Following the launch of SONGFLAME® at K-2019, Songwon has further developed its proprietary halogen-free technology and is adding a new product to its portfolio of flame-retardant synergists.

Songflame WB 201 solvent-free, aqueous, flame-retardant dispersion is designed especially for the coatings, adhesives, sealants and elastomers (CASE) market and is also highly suitable for textile applications requiring flame-retardant properties. The benefits of the new product include easy handling for customers working with waterborne systems, low viscosity and a high active content.

“Songflame products provide a powerful building block for formulators of halogen-free materials. They allow our customers to achieve an ideal balance between increasingly stringent market requirements and overall cost efficiency,” said André Le Gal, Leader Market Center Flame Retardants at Songwon. He added: “There has been significant progress since the launch of the Songflame range in terms of project momentum and technical approvals despite the challenging market conditions for our customers resulting from the impact of COVID-19.”

In keeping with its commitment to help improve sustainability throughout the value chain, Songwon has built up the new flame-retardant synergist portfolio with a view to promoting the growth of halogen-free solutions.

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