The Operation of Sewage Disposal Plants a Manaual for the Practical Management
The Operation of Sewage Disposal Plants a Manaual for the Practical Management
Francis E Daniels
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After a bed has been in service for a time jelly- like films form upon the surfaces of the stones, and while the sewage is in contact with these films important changes in the liquids occur by a process known as ad- sorption. As this process is comparatively rapid, the bed is soon drained to allow the entrance of a plentiful supply of air to enable the organisms in the filter to con- tinue the process of oxidation, and to regenerate their bio-chemical activities. This empty or resting phase is ...of prime importance, and sufficient time should always be allowed between fillings to enable the filter to be- come fully prepared for the next dose. Although little is known of the actual bacterial types in a contact bed, there seem to be at least three reac- tions involved hydrolysis and denitrification during the full period, and nitrification during the empty period. In addition to the bio-chemical processes touched upon, there is also more or less sedimentation in a con- tact filter. This part of the work, however, is purely physical.
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