Specification of Job Cole and William Abbott : treating and utilizing sewage, &c.
- Cole, Job.
- Date:
- 1872
Licence: Public Domain Mark
Credit: Specification of Job Cole and William Abbott : treating and utilizing sewage, &c. Source: Wellcome Collection.
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![Provisional Specification. Cole 8f Abbott's Improvements in Treating and Utilizing Sewage, 8fc. tanks, and in some cases chemical substances have been added to it either before it enters or whilst it is contained in the settling tanks in order to precipitate the organic impurities contained in the sewage. The so]id and organic matters settle down at the bottom of the de¬ positing tanks, whilst the purified liquid portion of the sewage is allowed 5 to flow away into a river or stream on to the land for the purposes of irrigation. The deposit accumulated in the tanks has from time to time to he removed and dried to he manufactured into a saleable manure, and great difficulty is now experienced in drying such deposit, and in addition the accumulated deposit whilst it is drying frequently gives 10 off offensive smells and creates a nuisance wherever such sewage works are erected. The object of our Invention is to remedy these inconveniences and to facilitate the drying of the deposit collected in the settling tanks. Tor this purpose we form the bottom of the settling tank of plates of metal, 15 or tiles or other thin plates, and below such bottom we form hollow passages which are caused to traverse to and fro in a zig-zag manner from one side of the tank to the other. When an accumulation of deposit has been obtained in one of the settling tanks and the liquid portion of the sewage has been allowed to drain off from it hot water or steam or 20 other heated fluid is caused to traverse through the zig-zag passages below the bottom of such tank, and thereby the whole of the bottom of the tank is heated and the deposit is dried in a few hours. The dried deposit is then removed from the tank and the tank can be again used for receiving sewage. The several settling tanks may he covered over 25 with a suitable roof, and the gases or vapour given off whilst the deposit in any of them is being dried may be led through a fire and carried away to a chimney or may be otherwise disposed of. If chemical matters he used to purify the sewage and the liquid which passes off from the setting tanks is in a sufficiently purified state if may be allowed 30 to pass at once into a river. If the liquid which passes from the settling tanks be not completely purified it may he led on to the land for irrigating purposes ; it may also he purified by causing it to flowr from the settling tanks into a channel covered over at the top with gratings or plates over which is a depth of earth, which absorbs any smell which 35 may be given off, and the liquid then flows into or over shallow beds in which are aquatic plants; this completes the deodorization and purification of the liquid sewage and renders it fit to be passed into a](https://iiif.wellcomecollection.org/image/b30758087_0004.jp2/full/800%2C/0/default.jpg)
