Oct 05, 2017
Compact plant offers considerable benefits over activated sludge treatment / Site design enhances landscape and visual aspect / Civil engineering minimised at challenging site
The four-unit modular system is part of a £1.2m municipal sewerage scheme to help clean up the environment in Mělník District, 30km north of Prague. The centralisation of wastewater collection and redundancy of poorly maintained septic tanks is expected to raise the quality of local surface waters significantly.
The high-performance aerated filter – HiPAF - designed and manufactured by UK packaged treatment specialist WPL was specified by the Dřínov municipality’s engineering consultant prior to tender and is designed for 620 population equivalent. To meet rigorous environmental standards and budgetary targets, WPL carefully scrutinised a range of measures including installation technique, maintenance requirement and real-time telemetry monitoring.
Frantisek Mikulinec, WPL’s sales manager for central Europe said, “WPL fully supported the consultant’s requirements by creating a bespoke technical solution for wastewater treatment at Dřínov, paying particular attention to the environmental quality standards, site aesthetics and making further reductions to the whole life cost of the plant.
“We have worked closely with the municipal consultant and local contractor in Dřínov and have been involved at every stage of the project. This has included site layout, process design and supervision of the installation, including electrical works and telemetry. We have also undertaken the commissioning.”
The environmental impact of the whole WwTP project at Dřínov was minimised by careful planning. It was agreed that earth excavated at the site would be used to create a grassed embankment, keeping spoil on site and reducing truck journeys and waste disposal costs.
To further mitigate the visual impact of the treatment plant on the rural landscape and local community, a gabion stone wall was built at the entrance to the site. The wall combines with a wooden fascia to screen the walk-in kiosk, which houses the control panel and washroom facilities, and support the backfill around the modular tanks.
“By investing in more sophisticated, flexible technology for wastewater treatment, significant costs savings could be made in other areas and minimising the visual impact of the plant could be prioritised and realised. This investment helped to achieve goals shared by the community including maintaining the environmental quality standards and ensuring life continued to flourish in the stream where the effluent is emitted.”
The benefit of a WPL HiPAF package wastewater treatment plant compared to traditional activated sludge (AS) treatment is that it is engineered off-site and delivered in modular units. This means WPL HiPAF units are simpler to install and require a much shorter project lead time than AS plants.
Scheduling of works is less likely to be disrupted by inclement weather or logistical factors and the onsite labour requirement is reduced. Further, the plant is manufactured according to the individual design and process specification of the project and is very reliable and easy to maintain and operate in the long-term.
Onsite civil engineering work and construction risk is reduced as minimal concrete surround is required and excavation material can be reused. Baird said, “In conventional wastewater treatment installations in the Czech Republic, approximately 70% of costs would be spent on civil engineering works alone.”
A standard AS plant is a complete onsite build and unlike the modular WPL HiPAF, offers no off-site quality assurance and is not manufactured in a controlled environment. The compact WPL HiPAF units also require a much smaller site footprint than standard installations.
In countries like Czech Republic, where land costs are rising, packaged plants fulfil the growing need for high quality treatment delivered with smaller take-up of ground space. In Dřínov, the multiple cost-savings meant more of the project budget could be allocated to the landscaping and aesthetics of the site which, given its prominent location, was an important benefit to the local population.
The WPL HiPAF plant comprises four units; the primary settlement tank, a SAF for biological treatment and a final settlement module are connected in series. In addition, effluent passes in a circular stream from the primary settlement tank to a robust aerobic digestion system – RADS – and back.
Aerobic digestion is industry-recognised to reduce sludge output and extend desludging intervals without use of chemicals, which in turn reduces tankering costs. This is particularly cost effective in remote rural locations where long distances need to be covered.
Baird said, “Based on industry findings, our expectation is for the plant to significantly reduce sludge by up to 70% when it is fully loaded and matured.”
Martin Jakoubek, Senior Consultant said, “Along with a robust treatment process, the whole-life functionality of the WPL HiPAF was a key consideration when we were specifying for the Dřínov wastewater treatment plant. It was important that operation and maintenance was easy to carry out and that the routine technical skills required were not specialised.
“I am very happy that the site limitations, including the presence of groundwater and the need for careful landscaping, were overcome imaginatively through close collaboration with WPL.”
Mikulinec said, “I’m pleased that WPL is the company to introduce SAF technology to the Czech market. Prior to the installation of the Dřínov wastewater treatment plant, most houses had septic tanks and the effluent was slowly seeping into the village pond, causing considerable pollution.
“The villagers are now taking up the option to connect into the treatment works, which should take three months to complete. Each house has an individual pump station delivering wastewater into the WPL HiPAF.”
The Mayor of Dřínov, Jitka Bockova said, “Improving the quality of the environment and surface waters for the Dřínov community was a priority for me when I took office and better management of wastewater plays a major role. EU regulations like the Water Framework Directive are an important driver for raising environmental standards.
“They can also help smaller villages access the extra funding they need for an investment on this scale. Municipalities need technologies that provide robust treatment and are simple to install and operate, which is why I was impressed with WPL’s HiPAF.”
Gareth Jones, managing director of WPL said, “WPL’s technical expertise is helping us win contracts for applications like the Dřínov wastewater treatment plant. Building the plant off-site means there is a much shorter project lead-time and a much smaller site footprint is required.
“WPL’s RADS system is proving especially cost-effective in places like Czech Republic where there are many remote villages and tankering is costly.”
Mikulinec concluded, “WPL’s HiPAF is a very robust and reliable technology that is simple to install and easy to operate, which is exactly what is required in small villages which may not have skilled operators living nearby. The site can be examined via our real-time telemetry monitoring which will reduce maintenance for our client.
“Once proven locally, we expect uptake to increase significantly.”
Oct 18, 2017
This free poster serves as a handy visual reference for sewer rehab professionals.
Oct 16, 2017
The North American Society for Trenchless Technology (NASTT) - the leading association serving and promoting the North American trenchless industry - is bringing its annual No-Dig Show to the sun and beauty of southern California in 2018. The trenchless community ...
Oct 13, 2017
The Full Phase 1 of the Project is Estimated to be in Service by the End of the Year
Oct 12, 2017
This free poster illustrates how to protect yourself from wastewater biohazards.
Oct 11, 2017
Jeschke Umwelttechnik GmbH installs 50,000th Alphaliner
Oct 10, 2017
British Water’s Data & Analytics Focus Group is calling on professionals from the water and utilities sector to contribute case studies and unsolved challenges. A searchable, universally accessible digital library is being created by the group to share examples of ...
Oct 09, 2017
Department of Energy grant focuses on creating renewable fuels at wastewater treatment plants
Oct 06, 2017
Lightweight and compact, the MiniFlex plumbing camera is designed for navigating multiple bends in pipes from 1.25’’ and up. Features include a small camera head (0.76’’ in diameter) with 512 Hz sonde, a digital recorder and footage counter.
Oct 04, 2017
Organizers of the 5th China International Plastic Pipe Conference have announced a top international line-up of speakers for their event. Hosted jointly by CPPA (China Plastics Piping Association) and PPCA, the conference and exhibition will take place in Hangzhou on ...
Oct 02, 2017
First of Two Mixed Ground Machines will begin boring this autumn
Sep 29, 2017
A recent acquisition makes Thompson Pipe Group one of the largest and most diversified water, drainage and sanitary pipe resources in North America.
Sep 28, 2017
Industry Leaders Recognize Benefits of Innovative Technology as Part of KC’s Smart City Initiative