TAILIEUCHUNG - Membranes for Industrial Wastewater Recovery Episode 11

Tham khảo tài liệu 'membranes for industrial wastewater recovery episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 232 Membranes for Industrial Wastewater Recovery and Re-use Eraring Power Station purification of secondary sewage for boiler feedwater Australia Background Pacific Power s Eraring plant is a 4 X 660 MW coal-fired power station situated on Lake Macquarie which provides about 25 of the power requirement to New South Wales. The power station utilises salt water from the lake for condenser cooling with all other water supplied as potable by Hunter Water Corporation. Prior to 1988 potable water usage was almost Ml d 1 and represented one of the three largest costs to the power station. To reduce costs a water audit was conducted to identify the major areas of use. After engineering modifications the water use was reduced to 4 Ml d fn the chemical control room where various water samples are automatically analysed the supply was modified from using potable water to using recirculating auxiliary cooling water. In the ash and dust system gland sealing water was changed over from potable water to salt water. This increased costs in the ash and dust area but the saving in water costs overshadowed the increased maintenance. The wash down systems were modified to small high pressure nozzles. The audit indicated that significant savings could be made if another supply of process water could be found. A source became available when the Hunter Sewage Project upgrade of the local Dora Creek sewage treatment plant was initiated. As part of the upgrade a new wastewater treatment plant was to be built at Dora Creek which is approximately 6 km south of the power station. The sewage effluent was to be pumped under Lake Macquarie to an extended ocean outfall. The discharge pipeline was due to pass close to the power station and so reuse became an option. Following a detailed review period a deed of agreement was signed between Pacific Power and Hunter Water Corporation for a guaranteed 15-year period. During this period Pacific Power must accept all secondary effluent up

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