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Focus Water & waste treatment Controlling overflow risk

Problem: Following major and damaging floods in 2010, it became clear that the existing control and monitoring regime that controlled the flow to the Sandon Dock Wastewater Treatment Works on Merseyside was not operating as it should. Solution: Pulsar Process Measurement has supplied non- contacting ultrasonic level mea- surement instruments for incorporation into United Utilities’ Mersey Estuary Pollution Alleviation Scheme (MEPAS). The instruments pro- vide control and monitoring functions throughout the net- work of CSO/SSO chambers, vortex and interceptor sewers that form the MEPAS network. After the flood, the new con- trol systems contractor, Ramptec, along with UU’s modelling team,

redesigned the system operation through the 39 CSOs within the network. Pulsar Process Measurement supported, ensur- ing the instruments at each loca- tion were performing correctly. Under the new control arrangement, the holding capac- ity of the system is maximised, so storm flows are better man- aged and flooding risks reduced. Pulsar Process Measurement T: 01684 891371

Enter 225

When the flowing gets tough

Transforming system life cycle costs

Problem: Yorkshire Water was looking to replace the DC drive system used to con- trol a set of pumps at the Blackburn Meadows Wastewater Treatment Works in Sheffield. The aim was to lower energy consumption and reduce maintenance costs. Solution: Medium voltage AC drives from ABB have been selected to control the multi-pump arrangement. Six ACS 2000 drives with motors rated at 2 x 645kW, 2 x 505kW and 2 x 300kW were specified. The ACS 2000 was selected as it can be used without an input isolation transformer, thereby allowing a direct connection to the 6.6kV line supply (direct-to-line). The active front end (AFE) enables transformerless operation with reduced harmonic loadings. Direct-to-line combines the cost savings of a transformerless variable-speed drive with the benefits of voltage source inverters, including availability and reliability, high and constant power factor and superior dynamic control performance. As the drive has no transformer, the heat output is reduced.

The overall system, including drive, motor and pump, is more efficient due to the lower heat losses and the use of AC motors. As a result, Yorkshire Water has been able to achieve the required lower energy consumption and reduced maintenance costs. ABB Enter 226 Life’s a beach for actuators

Problem: As part of its AMP5 environmental improvement pro- ject, Wessex Water wanted to improve bathing water quality for the resort of Weston-super-Mare. The improvements will ensure the site can cope with the increased population and contin- ues to comply with Environment Agency standards. Flow control

equipment was required for use throughout the works. Solution: New process plant and equipment has been constructed to improve secondary treatment, while storm settlement tanks have also been introduced. Rotork has been chosen to supply IQ multi- turn and IQT quarter-turn intelli- gent electric actuators and IB manual gearboxes for motorised and hand operated valves and penstocks throughout the new works. All the electric actuators are Profibus-DP V1 network enabled and centrally controlled by a bespoke SCADA system. Rotork Controls T: 01225 733200

Enter 227 OPTIFLUX 2300 Process & Control NOVEMBER 2013 Enter 14 WATERFLUX 3070

Looking for a reliable measurement solution that is also MCERTS approved?

KROHNE, the market leader in electromagnetic flowmeter technology can offer an MCERTS approved flowmetering solution for even the toughest applications on wastewater.

The WATERFLUX 3070 for example, has MCERTS approval and thanks to an extremely rugged metal flow tube with Rilsan®

coating is suited

to a wide variety of applications, giving highly precise measurement even at very low flow rates. Due to the unique rectangular cross section of the measuring tube, measurement is entirely independent of flow profile, which also allows for extremely short inlet and outlet pipe runs.

The long term reliability and durability of the MCERTS approved OPTIFLUX 2300 electromagnetic flowmeter make it the standard flowmeter for the water and wastewater industry. Even grounding rings are not required with the patented Virtual Reference option.

KROHNE – MCERTS approved instruments for the wastewater industry.

Please see our website for more information:

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