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Blackburn Meadows Wastewater Treatment Plant Upgrade, Sheffield, United Kingdom

Key Data

River Don

Blackburn Meadows Wastewater Treatment Plant (WWTP) is located in the city of Sheffield in South Yorkshire, England, in the UK. It was built on a 78 acre site, which falls under the jurisdiction of Yorkshire Water. It currently serves about 800,000 inhabitants of the cities of Sheffield and Rotherham.

The plant is currently being upgraded by a joint venture (JV) of AECOM and Galliford Try. Under two contracts worth £49m ($78m), the JV will primarily improve and add new facilities at the site to expand the plant's capacity to serve up to 830,000 people.

Yorkshire Water, which owns the plant, awarded the two contracts to the JV in April 2012. The first contract, worth more than £30m ($48m), will enable the treatment plant to meet the requirements of the European Union's (EU) Freshwater Fish Directive (FDD).

The second contract, worth about £19m ($30m), will enable the plant to treat about 21,000t of sludge on an annual basis, with an integrated thickening and dewatering processes. Upgradation is expected to be completed by September 2014.

Yorkshire Water's WWTP upgrade project

The project comprises of the construction of new inlet works and eight new primary settlement tanks and aeration lanes, including the replacement of various facilities.

"It currently serves about 800,000 inhabitants of the cities of Sheffield and Rotherham."

All the upgradation works are part of the first contract and will improve the quality of effluent being discharged into the River Don. The primary objective of the upgrades is the reduction of ammonia to no more than 3mg per litre.

The second contract will comprise of installing a new mesophilic anaerobic digestion facility at the plant. It will include the construction of buildings and various other pieces of equipment required for the treatment of sludge. Mesophilic anaerobic digestion enables the breaking down of biodegradable materials using micro-organisms under moderate temperatures.

The new sludge treatment facility will enable the neighbouring farmlands to use the recycled sludge as manure. The facility will also enable Yorkshire Water to generate 1.9MW of renewable energy using combined heat and power units.

The whole project is expected to cut down carbon emissions by 6,500t and reduce greenhouse emissions by up to 30%.

The upgradation project also includes improvements to the Don Valley Pumping Station and the combined sewer overflow, which will ultimately help in controlling floods in the future.

Odour control system for the upgraded WWTP

The odour control system for the WWTP will be provided by Pure Air Solutions and Plasticon UK as part of a contract which was awarded in December 2012. The two companies will integrate SULPHUS technology into the upgraded treatment plant under construction. The technology, which comprises of a compact biotrickling filter (BTF) with a synthetic packing, is the first of its kind in the country.

History of Blackburn Meadows wastewater facility

Construction of the Blackburn Meadows wastewater treatment plant began in 1884 and was completed in 1886. The plant comprised of 30 precipitating tanks and 60 aerating tanks.

The wastewater was treated using lime. The sludge from the plant was used as manure in the neighbouring farms. The sewage from Sheffield to the treatment plant was conveyed initially through trains and later on included trunk sewers.

The effluents from the treatment plant were discharged into the River Don, which polluted the river. The plant underwent a series of upgrades in later years to improve the treatment system and effluent quality.

Past improvements to Sheffield's water treatment plant

The plant has witnessed several upgradation works carried out over the years. The years from 1905 to 1909 witnessed the introduction of a biological treatment system to improve the treatment of effluents. It replaced the lime-based treatment system.

"The whole project is expected to cut down carbon emissions by 6,500t and reduce greenhouse emissions by up to 30%."

A bio-aeration system was later introduced in 1914, which reduced the biochemical oxygen demand of the discharged effluents. The plant was yet unable to restrict the large content of ammonia, which had a large impact on the aquatic life present.

Major upgradation work was carried out in five phases from 1956 to 1969. It added a filter pressing plant, a preliminary treatment plant, a storm sewage treatment plant, new sedimentation tanks to replace the old ones and also a sludge incinerator.

From 1979 to 1983, a tunnel measuring 5.5m in width and 2.14km in length was constructed to connect the treatment plant to a drop shaft in Hawke Street, including a pumping station at the site of the treatment plant. Post 1983, another tunnel connecting a drop shaft near Furnival Road, including several sewers connecting various strategic parts of the city, was constructed.

In 1990, the filter presshouse and incineration plant were replaced by a new sludge-dewatering plant and a fluidised-bed incinerator to meet the requirements under the Waste Incineration Directive.

The problem of the ammonia levels was checked to an extent by 1992 with the introduction of a system using anoxic zones and a diffuse air activated sludge treatment.

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