Waste Heat

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PART B. WORKS INFORMATION
^ D w r Cymru

Location
Site Location Map

Welsh Water

Cardiff WWTW. Operating Manual

1. 1

Site Location Map
National Grid Reference: Asset No.: ST 213 758 33785

Cardiff WWTW

Directions Heading West along M4, turn onto A48 at Junction 29. After approx. 2 miles turn left onto A4161. After approx. 1 mile continue on A4232. After approx. 2 miles at roundabout, take second exit onto Rover Way towards the Docks. At 1st roundabout turn left onto Tide Fields Road. Entrance to Works is 20 metres along Tide Fields Road.

WOL 33785-01, Issue: 01, 27 March 2003

B- 1.1 Page 1 of 1

PART B. WORKS INFORMATION
^ D w r Cymru

Location
Site Precautions

Welsh Water

Cardiff WWTW. Operating Manual

1. 2

Site Precautions
There is a Site speed limit 15 mph and all vehicles entering the site must travel through a security post where the vehicle details are recorded. The site assembly point is located outside the main office block on the grassed area. All persons visiting the site must sign in and out; the works visitor log book is located in the entrance hallway to the operations block.

WOL 33785-01, Issue: 01, 27 March 2003

B- 1.2 Page 1 of 1

PART B. WORKS INFORMATION
^ D w r Cymru

Works Description
Works Description

Welsh Water

Cardiff WWTW. Operating Manual

2. 1

Works Description
Cardiff waste water treatment works is designed to serve Cardiff and the surrounding valleys. Raw sewage is treated before being discharged into the Bristol Channel from a 4km long sea outfall. • Population Equivalent • Dry Weather Flow • Flow to Full Treatment = 888,250 = 4,540 l/sec = 6,060 l/sec

The Works receives flow from two stations (Central PS and Interceptor tunnel Inlet PS), the interceptor tunnel collects flows from Eastern District PS, Rhymney Valley Storm Works and Western Valley Storm Works, each equipped with 6 mm Rotamat storm screens. Flows are pumped into the works via either the main inlet pumping station or the Cardiff Central Pumping Station, the two flows converging at the inlet screening works immediately before the screen inlet penstocks. The main process sections are the inlet pumping station, inlet works, Interstage Pumping Station, Sequential Batch Reactor (SBR) tanks, Outfall Pumping Station, and Sludge Treatment Plant. There is also a visitor centre at the Works. Storm Water All Storm Water is processed at the off site Pumping Stations. Inlet Works Incoming flow is screened, the screenings then being macerated and compacted for disposal. The screened flow then continues through a grit removal plant, where the grit is separated out before being classified and put into skips for removal from site. Interstage Pumping Station The screened and de-gritted effluent gravitates to the Interstage Pumping Station from where it is pumped along dedicated pipelines to one of two SBR distribution chambers (one for each SBR phase). Sequential Batch Reactor (SBR) Flow is directed to a SBR basin where a process of settlement, aeration and decanting takes place. A proportion of sludge is returned to the SBR basin as returned activated sludge (RAS), whilst the remainder is collected as surplus activated sludge (SAS) Outfall Pumping Station On completion of the SBR process, treated effluent gravitates to a final effluent extract pumping station (where process water is drawn off) and then to an outfall pumping station from which it is discharged into the Bristol Channel. Sludge Treatment Plant Surplus activated sludge is pumped to a sludge treatment building where it is mixed with polymer solution, centrifuged and pumped into the drying plant for thermal drying before being removed from the site. Visitor Centre A visitor centre has been incorporated into the WWTW site (located at the south west corner of the works between the SBR tanks and the sludge handling plant) to provide VIP and management facilities for Dwr Cymru Welsh Water and other interested...
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