Minutes of Proceedings of the Institution of Civil Engineers Volume 148 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...at Mr. Jchn Stanning's works, an alternative method to that proposed, and one which had been adopted in some instances, would be to collect these liquors in a separate tank and to distribute them gradually over the day's flow, the object in this being to neutralize the alkali by means of the acids used in the other processes. They were highly concentrated and difficult to deal with by themselves, but their volume was only about 4 per cent. of the total, and if they were thus distributed no difficulty should be found in the treatment, if the capacity of the tanks and filters was proportionate to the volume. In the description of the treatment adopted by Messrs. Peel, Tootal and Company, it was stated that the firm had struggled with precipitation-tanks and ordinary continuous-flow filters without success, but the size of the tanks and filters was not mentioned, nor whether there had been any special reason for the non-success of the treatment; it would be interesting to have this information. Later, it was mentioned, the capacity of the tanks had been increased to three days' flow and the septic treatment had been adopted. Was it to be inferred from this that treatment in tanks of this capacity would not be successful unless septio treatment, with its accompanying filter 11 feet in depth and revolving sprinkler, were adopted? Surely this was rather an alarming prospect to put before manufacturers. Another item of expense in connection with the deep coarse filters proposed was the necessity for raising the temperature of the liquid turned Mr. Tatton. on to them; as it was doubtful whether, if the temperature was not raised, the biological action in the filters would be sufficiently maintained. This raising of the temperature was done by means of steam. In the...