Effluent Treatment

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Southern water to increase investment in 'green' power

Southern Water has pledged to utilise low-carbon technologies and sustainable best practices to improve water supplies.

One of Anglian Water's sewage treatment works, King's Lynn

Anglian Water invests in dewatering technology to meet renewable energy targets

Anglian Water is investing £1m to optimise screenings and dewatering efficiency at ten sewage treatment works, supporting its targets for enhanced sludge treatment capacity and renewable energy generation.

Yorkshire Water aims to increase biogas production

Yorkshire Water has invested in thermal hydrolysis technology in a bid to create a more sustainable route for sludge treatment and disposal, as well as increase biogas production.

WRc managing director Mark Smith passionately believes the industry needs to collaborate in order to better innovate

Water industry told 'collaborate to innovate'

Innovation is the 'silver bullet' for the water industry and collaboration will be key in delivering it, WRc managing director Mark Smith told delegates at last week's WRc innovation day.

Shared watercourse called for right jet-mixing system

Tony Price of ITT Flygt explains how the sludge-treatment needs of a sewage treatment works, which nestles next to a trout fishery in rural Wales, were met

Lords rule on sewage case

Sewage treatment requires to be regulated under PPC, even when final disposal takes place somewhere else.

Kent coast standards soar in £66M cleanup project

The first flows for the Margate & Broadstairs Urban Wastewater Treatment Scheme were pumped along 11km of new pipeline to a new wastewater works at Weatherlees, Kent, in March. Natasha Wiseman visited the site.

Sludge blanket detector trials

After its weighing systems became unreliable after 15 years' service, Bristol Water reviewed the way it measured sludge blanket levels. And Partech Instruments was called in.

Southern Water scheme to clean up Kent coast nears completion

A £70M scheme will take sewage from Margate and Broadstairs in Kent, previously discharged into the North Sea, pump it 11km, and treat it at a new sewage works near Ramsgate. Dean Stiles reports on the challenging venture.

Eighteen years old, and still pumping

Like the human heart, pumps in industrial processes do not really do anything specifically interesting. But without them no other process could work properly. If you run an internet search on effluent treatment or primary sludge, you can find lots of sites describing the processes. But, says Toby Clarke, none of them describe the pumps that are used to move materials between each process stage

A polished solution

Virotec provides tailored technology for the treatment of water and waste across a broad range of industries. General manager Simon Tillotson reports

Driving forces

Disposal route protection, bioenergy production and increased volatile matter conversion are the new market drivers for sludge treatment in the UK. Aidan Cumiskey and Dorian Harrison of Monsal explore some of the issues when considering investment in the new generation of technologies

Treat less, treat faster - a Seine decision

The Seine Aval wastewater treatment works near Paris is claimed to be the world's second largest. With the help of OTV France (VeoliaWater) and to improve the quality of water returned to the River Seine, the plant is adding a new nitrification-denitrification facility to remove nitrogen from effluent.

France extends Europe's largest WWTP

Europe's largest and oldest wastewater treatment plant, the Seine Aval near Paris, was failing to meet new European discharge standards. Natasha Wiseman reports on the construction of a new nitrification-denitrification unit, using Biostyr technology from French engineering group OTV France (Veolia Water), which will remove the nitrogen contained in the effluent passing through the plant and improve the quality of water returned to the river Seine

Meeting the DBO challenge

Public-Private Partnerships has created a trend towards inclusive contract arrangements that reflect the complexity of modern project management. Many contracts now involve the integration of design, build and operation, says David Parsons.

Best investment

Over the next four years, Scottish Water will be delivering a multi-billion pound scheme

An artistic impression of the planned new facility at Henriksdal WWTP. Image: Sweco.

Rebuild for world's largest underground WWTP

Plans to expand residential, commercial and business faciliites near to the world's largest underground wastewater treatment plant in Stockholm, Sweden, necessitated rebuilding the plant. Johnny Stohne, senior engineer for SWECO, reports on the £30 million project, which includes new mechanical treatment, transportation and ventilation facilities.

The Valenton sludge processing plant in Paris, France, which consists of three DDS 70 drum dryers with heat recovery by thermal oil, opened in 2005. Image: Andritz

Thermal dried sludge meets EU standards

Efficient sludge management is facing the twin challenges of more stringent land disposal regulations and an increase in the quanity of wastewater. Doris Thamer, senior sales manager, and Werner Jenewein, senior process manager, of Austrian sludge specialist Andritz claim that drying technologies can meet both these demands.

All-in-one sustainability

New, highly mechanised wastewater treatment systems use more energy and produce more sludge. But LAS has a more sustainable answer

The right choice for shifting sludge

Handling sludge efficiently is a challenge for anyone trying to plan and run a waste-processing facility. Finding the right type of pump to cope with these varying demands is critical to the whole operation's success, says Andrew Barry.

Worms turn most sludges into soil

A new environmental research centre at the University of Hull in England was launched by the UK Secretary of State for Trade and Industry, Alan Johnson, on 16 September. Natasha Wiseman took the opportunity to find out more about a pilot project investigating into the use of worms for sludge sewage treatment.

From Russia with sludge

Black & Veatch has successfully mobilised the design-build contract for St Petersburg's South West Wastewater Treatment Plant (SWWWTP) - almost two decades since construction first began.

Coastal rescue

A new WwTW will help preserve the bathing areas of Cornwall's tourist trap, the Lizard Peninsula. South West Water's Steve Cross and Hyder Consulting's Dominic Lovell report.

Some like it hot

Adapting temperature-phased anaerobic digestion is being seen as a way to upgrade plant to achieve a Class A sludge product. Frank Rogalla reports

Inlet chamber to fine screens and grit-removal facilities. Photo: B&V

Better treatment for St Petersburg - at last!

Two decades after construction first began on the St Petersburg South West Wastewater Treatment Plant, consulting engineers, Black & Veatch, have successfully mobilized the long-overdue design-build contract in under two years. Mike Walsh chief engineer at Black & Veatch reports on the most important environmental project in the Baltic Sea area.

Preventing odour nuisance

Pat Coleman of Black & Veatch investigates key odour control issues that need to be taken into account when designing new or upgrading current WwTWs

Meeting sludge obligations

Purac's improvements to SWW's digester plant are set to ensure the water company meets new sewage sludge treatment regulations

Making sense of sludge

Paul Lowe, Nigel Horan and John Hudson1 discuss the implications of new sewage sludge recycling regulations and the landfill directive

Making sense of sludge

Paul Lowe, Nigel Horan and John Hudson1 discuss the implications of new sewage sludge recycling regulations and the landfill directive

Looking good and smelling good

Thames' new WwTW at Island Road, Reading, is something of a flagship - with an unusual appeareance, combination of processes and odour management system. WWT reports.

Technically speaking

Black & Veatch's Frank Rogalla looks at ozone hydrolysis in wastewater treatment

Technically speaking

Black & Veatch's Frank Rogalla, with co-author Grzegorz Bujocze, looks at handling solids for low nutirent residuals

Slashing costs not standards

Pressures on sludge disposal routes have given water companies cause for concern and led to UK trials of a system which tackles the problem at source, in the activated sludge process

The crowning glory

What does the Crown Sludge Disintegration System have to offer?

The crowning glory

What does the Crown Sludge Disintegration System have to offer?

Regulations back on agenda

Now that plans to implement the HACCP system governing sludge are now back in motion, Max Rooksby from Atkins Water describes how water companies are preparing themselves

Sewage treatment contract showcases expertise

In association with sister company, Consolidated Contractors International Company SAL, ACWa Services has won a contract to design, install and commission the Phase 6 extension to Sharjah Sewage Treatment works in the United Arab Emirates. The contract forms part of an £18million project being carried out by CCIC for the Sharjah Municipality, with the Halerow International Partnership acting as the client’s engineer.

Location, location, location

Despite the need to improve the quality of Glasgow's water supply, getting approval for a new WTW has not been easy. Norrie Hunter reports on the Loch Katrine Project's progress

Addressing sludge concerns

Three UKWIR projects evaluate the risks of contaminants in sludge

Sludge reuse: the time is now

Mike Rewcastle, technical strategy manager - sludge, for Northumbrian Water, argues the water industry should not be exclusively responsible for the future management of sludge

Local conditions save on primary energy

Regulations in most European countries stipulate a specific ranking for methods of organic waste treatment.

Spanish capital gets all fired up

Centralised sludge treatment in Madrid will employ two sludge-drying plants fuelled 100% by co-generation exhaust gas flow to meet European Union regulations.

The desirability of power cuts

The power utilities use to meet treatment standards is growing, as is political pressure to reduce energy consumption. Chris Webb looks into the problem and some of the solutions

Water supply in all weathers

With a lack of groundwater and limited storage capacity Jersey is designated an area of water scarcity. Howard Snowden tells WWT about challenges facing the water company

Figure 1 : Full scale hydrolysis system with digesters in background – source United Utilities

Sludge Treatment - Process intensification and optimisation

Aidan Cumiskey of Monsal examines opportunities for optimisation of existing sludge assets.

Making a critical assessment

Chris Webb looks at the use of supercritical oxidation to treat sludge

Performance comparisons

Meniscus reports on how benchmarking has cut WWs energy costs

Techically speaking

Black and Veatch's Frank Rogalla looks at the Ringsend works in Dublin

Sewage sludge in the dock

Tackling the loading and unloading of Northumbrian's sludge tankers

The costs are much lower for on-site wastewater treatment at large treatment works than those incurred from trade effluent charges

The economics of treatment versus discharge

Senior group engineer at W S Atkins Consultants, Martin Kimber, argues that if actual costs were applied, the treatment of wastewaters from water treatment plants would be seen to be more economical than discharge to a sewer.

Technically speaking

Black and Veatch's Frank Rogalla looks at biosolids vermistabilisation

Embracing the natural cycle

Colin Brade and Aidan Cumiskey of Monsal look at the positive benefits of using biosolids in agriculture and why the water industry should do more to promote organic recycling

Dryers at Ford STW use methane from the digesters

Technically speaking

Black and Veatch's Frank Rogalla looks at thermal drying of wastewater biosolids

Southern spent £2M developing new technology

Flagging-up improvements

Southern Water's capital investment plan begins to pay dividends

Sustainable, safe and economically viable

Juan Gonzalez, Ingemar Karlsson of Kemira outline advances in treatment to produce a high quality product

Belgian plant finally gets the go-ahead

But the new Brussels North wastewater scheme - one of Europe's biggest BOOT projects - is facing a challenge in the courts from an unsuccessful contender in the race for the $320M project as Alan George reports from Brussels.

Computer-aided compliance

Watermill Environmental's Peter Garnett looks at audit trail software

Putting the squeeze on sludge

Simon-Hartley's Peter McLoughlin on maintaining process efficiency

Sewage sludge: a burning issue

Health and environmental concerns are making the spreading of sludge on agricultural land less attractive. The alternatives, however, are far from established as Chris Webb reports

The use of silicone antifoams in STWs is common practice

Foam dispute bubbles away

Dow Corning's C Stevens and J Pollack refute STW silicone side-effects

Fuel of the future

SEGHERSbetter technology sees sludge drying as one way forward to zero emission industrial zones.

The shape of things to come

As part of WWT's 50th birthday edition, we invited people from some of the industry's key organisations and companies to assess the present and future state of the water world

A contemporary view of Maple Lodge

A case of long-term treatment

Like WWT, Maple Lodge STW in Hertfordshire is 50 this year. Looking back at the site's history Malcolm Hallsworth finds a microcosm of the UK's wastewater treatment industry

Choosing the right deodorant

With so many odour control technologies available, how do you pick the best one? Joanna Burgess and Richard Stuetz from Cranfield University's school of water services help out.

Secondary treatment works

Project manager Bill Williamson on the £70M Howdon STW upgrade.

Welsh challenge for Galliford

Galliford Northern's contracts manager Stuart Smith describes his company's progress with Welsh Water in AMP2 and explains how a series of new projects will be managed in AMP3.

Systems range from towers to tunnels

A case for controlled composting

Windrow composting can be difficult to manage, but conditions in a closed system can be closely controlled. Sludge consultant Jim Walker makes a case for in-vessel composting.

Membranes for estuary water

Faced with insufficient water for their planned expansion, Dow Benelux1, operating from its Terneuzen site in the South West corner of The Netherlands, awarded a Build-Own-Operate contract to a joint venture comprising USF Benelux2 and Delta Nutsbedrijven3. The contract covers the design, construction, supply, installation, operation and maintenance of a water treatment system providing high purity demineralised water for on-site high pressure boilers and make-up water for cooling towers.

Dublin STW project underway

Work on the Dublin Bay STW in Ireland is now underway. The process will include lamella plate settlement, sequential batch reactors (SBRs) and thermal hydrolysis of sludge.

Wessex Water has opted for settlement lagoons instead of coarse screening.

Wessex upgrade aimed at sea change

The IT network is at the heart of the modern STW. A recent project to improve bathing water quality at Weston-super-mare demonstrates the levels of sophistication now required.

Interstage pumping station, Hidrostal pumpsets and discharge pipework

Welsh Water chooses to go with the flow

In April 2000 the expansion of Welsh Water's Nash STW was completed. Sited on the banks of the River Usk, a tributary of the Severn, Nash serves the whole of Newport courtesy of a new tunnel and pipeline connecting the western half of the town. The project is of vital importance to Welsh Water, which aims to improve the coastline of the Severn estuary between Chepstow and Newport. The work represents an investment of £89M and will eventually take wastewater not only from the population that borders the Usk but also, via another pipeline, from Chepstow's coastal strip.

Plenty of muck ­ but is there enough brass?

Safety and cost-minimisation were central issues at this year’s IBC conference on Sewage Sludge; Disposal, Treatment and Use. Peter Minting reports.

Space-age Swansea plant complete with UV

Welsh Water's showpiece Swansea Bay STW has been opened by the minister for Wales, Alun Michael. Designed by Hyder Consulting and OTV Birwelco, the plant has been praised by environmental groups, including Surfers Against Sewage.

Frank Elskens, OEC managing director (right), and technical and commercial executive Ivo Pallemans with part of the mobile soil washing plant used in West Africa.

Belgian technology targets UK

OVAM, the Flemish equivalent of the UK's Environment Agency, was first given powers to enforce clean-up of contaminated sites by a Parliamentary Waste Decree of 1981. In the UK, by contrast, similar powers will only come into force with the implementation of Part IIA of the 1990 Environmental Protection Act - due this Summer. In short? The Belgians are coming.

Integrating approach to maintaining quality

Bob Borrill, water supply process manager at West Midlands Region of Severn Trent Water, explains how the collection and interpretation of data, often provided by computer control systems, is vital in the drive to improve the standard of service provided to its customers.

Investment goes west

West of Scotland Water has just been reorganised to ensure that it is capable of meeting and exceeding the demands of its customers. To meet this challenge, the authority is spending millions on its capital expenditure programme upgrading and constructing its infrastructure.

Ernesettle stream with the main sludge storage tank showing the odour control unit to the left.

Sludge treatment and handling scheme

Sludge production in the South West Water region is predicted to rise from 25,000 tonnes dry solids to 48,000 tonnes dry solids by 2011. Stephen Roberts, project director for Oscar Faber, describes South West Water's new sludge treatment and handling facility.

Gaining planning permission for sludge incinerators can sometimes be difficult

Burning and burying - dealing with sludge

Sludge treatment and disposal has recently been a common discussion subject especially with only three months before the disposal of sludge to sea is banned and recent talks with retailers on what treatment is safe. Gary Wilson examines some of the issues concerning sludge treatment and disposal and what the industry is doing to deal with them.

Can earthworms provide the answer to the sludge treatment problem?

Vermistabilisation is the use of earthworms to treat sewage sludges. Dr Piers Clark of WS Atkins Water explains how vermistabilisation, with its low capital cost and relatively simple operation, may represent the ideal solution to some rural UK sites, where raw sewage has traditionally been disposed direct to agriculture.

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