Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
No. Name of town or district. Remarks.
22 Huddersfield That by no process can the formation of sludge be obviated.
When the crude sewage is treated in contact beds, the rapid accumulation
of matter in the beds renders the process impracticable.
That by the use of a small quantity of lime and copperas (sulphate of iron),
followed by contact bed treatment, a satisfactory effluent can be produced.
That the contact beds used for the purification of the effluent after chemical
precipitation will not retain their capacity indefinitely, and that in the
course of a number of years it will be reduced to such an extent as to
render necessary the washing or riddling of the material.
That by the open septic process 38 per cent, of the sludge is destroyed.
The septic effluent is not as amenable to subsequent contact bed treatment
as the effluent from chemical precipitation.
The capacity of the beds treating the septic effluent decreases more rapidly
than that of the beds treating the effluent after chemical precipitation,
owing to the excessive amount of suspended matter in the septic effluent.
The septic effluent after double contact is frequently unsatisfactory.
23 Hyde A complete scheme of sewage treatment based upon these results has been
submitted to the Local Government Board for approval.
24 Keighley The council does not intend installing bacteria beds so long as intermittent
land filtration is satisfactory.
25 Kettering The bacteria beds have recently been examined and found to be quite clean
inside and without any accumulation of sludge beyond some fine deposit
on the surface.