Patent GB-190410539-A (GB)
Title: Improvements in Treatment and Utilization of Sewage and other Refuse.
Inventor: STRINGFELLOW JOHN HENRY WILLIA
Filed: 1904-05-07
Granted: 1905-05-04
Abstract: 10,539. Stringfellow, J. H. W: May 7. Manures refuse, treating; sewage, treating; precipitants.-Sewage, either alone or co-jointly with house or industrial refuse, road scrapings or sweepings &c., is treated to form manure with the products, both solid and gaseous, obtained by the action of sulphuric acid on furnace slag, and with ferric solutions, lime and other chemicals to precipitate and fix the ammoniacal, nitrogenous, and phosphatic constituents. Systems are described suitable for a village where earth closets &c. are used and for the sewage of a large town. In either case, the slag is treated with the acid in a special chamber and the gas given off passed through the liquid portion of the sewage &c., the portion not absorbed, which is chiefly hydrogen, being led off and used for heating, lighting, &c. The household refuse, road scrapings or sweepings, &c. are cleared of broken crockery, glass, and similar inorganic matters, tinned or galvanized iron being heated to drive off the covering metal and the iron converted by treatment with steam or acids into oxide, which is added to the manure. The remainder of the refuse is mixed with furnace slag and treated with sulphuric acid and ground. The resulting product is mixed with the night soil, in the case of a village, and the whole mixed with the liquid refuse which has been treated with the gas. In the case of the town, it is mixed direct with the precipitated sludge. The sewage in the main conduit, in the case of a town, has the coarser solid matter separated from it by the apparatus shown in Fig. 4. Across the main conduit MC are placed gratings SC<1> slanting towards an opening in the side of the conduit closed by the gate SG and communicating with a side channel SC, into which the solid matter separated by the grating drifts. The solid matter is removed by elevators, delivered on to the perforated platform SC<2> to drain, and treated like the household refuse. The liquid is pumped up and allowed to flow down past a water wheel U, Fig. 5, which breaks it up and allows the gases to escape and also gives motion to stirring-apparatus and elevators M<4> for supplying the precipitant. The bottom of the mill race is formed by a block Q which can be slid in or out by screws &c. according to the quantity of liquid. The sewage passes into a set of airtight chambers F, H, J where the treated slag and gas are added to it, the latter entering through short pipes on the under side of a floating box N<2> connected with the generator by the jointed pipe N'. The whole is mixed by paddle-wheels F<1> and by flowing through gratings J<2>, the gases given off passing away by the pipes R', R<2>, R<3>, R', SS to be purified. The gases may be used for heating the chambers F, H, J to facilitate the reactions or for other purposes. The exit from the last chamber is closed by a tloating door which prevents gas from escaping or air from entering. The sludge is allowed to settle in tanks, and the effluent is treated, if any odour remains, with potassium permanganate or ferrous or manganons compounds. It is then treated with powdered silicate of alumina and oxide of iron, and is stated to be fit for flushing drains, watering roads and gardens, feeding steam boilers, &c. The sludge is mixed with the treated household refuse and with road sweepings, ashes, iron oxide, &c. to form manure.