ISSN:
1747-6593
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
The deep-shaft activated-sludge process, which was originally developed for single-cell protein production by ICI1, has been successfully applied to the treatment of high-strength domestic and industrial waste water. The process exploits the hydrostatic pressure generated at the bottom of a column of liquid to enhance the transfer of oxygen to a rapidly-circulating mixed liquor.About forty deep-shaft plants are in operation worldwide of which four have been built in the UK. The latest of these treats a mixed industrial and domestic waste water at Anglian Water Authority's sewage-treatment works at Tilbury. At a dry-weather flow of 30 Ml/d, this is the largest deep-shaft plant in the world.The paper gives a description of this works and some performance data obtained during a 3-month monitoring period following plant commissioning. The results show that the BOD and suspended solids loads were extremely variable and exceeded the design capacity of the works by approximately 40% during the month of July. Despite this, the effluent quality remained within consent limits with a 95 percentile BOD of 83 mg/1 (consent limit: 120 mg/1 BOD).The computerized aeration control system was not functional during the trial period; nevertheless, considerable potential energy savings were indicated. During a one-week period, an average of 41 000 kg BOD were removed daily at a mean oxygenation efficiency of 2.5 kg BOD removed/kWh.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1747-6593.1989.tb01525.x
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