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Cofnod / Record

CP48 - Photographs: Centre for Environment, Fisheries & Aquaculture Science, Conwy.
- 5 - BUNDLES of Loose Photographs by Subject
  - 1 - The Site and Work of the Board of Agriculture and Fisheries mussel purification station in Conwy [and successor authorities].
    - 5 - Mussel purification at Conwy. Includes purification tank B resembling in all essentials the commercially operated mussel tanks at Conwy, showing pump, suction hose and [delivery] hose, final shell sterilisation is in progress [mussels can be seen submerged in water]; purification tank B empty of water, mussels can clearly be seen covering the base of the tank; reconditioning tank A to which the water from [purification tank] A is pumped for chlorination, followed by aeration and de-chlorination. Three of the nine diffusion plates as used for [activated sludge] can be seen, each having its own control valve, thus providing even aeration. The large pipes at the back of the tank were installed for other experimental work for which the tank was originally designed; reconditioning tank A showing aeration and de-chlorination in progress; [small pump] and battery jar showing aeration of used sea water after chlorination and before re-use; view through open door of refrigerator of a battery jar containing mussels [experiments on cleansing of mussels at low temperatures]; two battery jars each containing seawater made turbid by a small quantity of Fullers earth, the left hand jar contains no mussels while the right hand jar contains thirty mussels which have just been immersed, a dark wooden bar placed behind both jars is barely visible through the water; the same jars two hours later, the left hand jar looks exactly the same, the right hand jar now contains clear water and the mussels and the wooden bar behind the jar are clearly visible; exterior view of semi-scale plant, showing tall aeration tank in the foreground, and shed containing mussel cleansing tank, pump, compressor, etc. in background; interior view of semi-scale tank showing pump, compressor, oil [fitter], air-flow meter and pipe conveying compressed air to aeration tank; mussels in semi-scale tank being hosed for external cleaning; measured dose of chlorine being added whilst supernatant water is being pumped from cleansing tank to aeration tank. [2 series of photographs, C/P/48/5/1/5/1-4 containing 4 photographs plus 2 duplicates [enlargements], original number 1-4; C/P/48/5/1/5/5-12 containing 8 photographs, original number If/2/4-5,7-8,10-13. All photographs have writing on dorse.]

Cyfernod / Ref No	CP48/5/1/5/5
Teitl / Title	Small Scale II, Aeration of Used Sea Water after Chlorination and Before Re-Use
Ddisgrifiad / Description	Handwritten explanation on reverse.
Dyddiad / Date	[c. 1946]
Graddau / Extent	1 photograph
Lefel / Level	Item