Patent GB-127353-A (GB)
Title: A Process and Apparatus for the Complete Treatment of Sewage or Contaminated Liquid.
Inventor: LINDEN LUCIEN
IPC: B01D21/00
Filed: 1917-09-01
Abstract: 127,353. Linden, L. Sept. 1, 1917. Tanks and containers.-Sewage and other liquids are rapidly purified in passing continuously through the units of a small plant of which the first unit is provided with (1) a special arrangement of fixed baffles for agitating the liquid to break up solids, and, if desired, to cause the admixture of reagents, and (2) a settling-chamber for collecting heavy particles; the liquid passes from the first unit to the succeeding units, which comprise settling-tanks and filters, and is there subjected to operations such as fat-removing, clarifying, sterilizing, aerating, and deodorizing. In the plant shown, the first unit consists of a chamber b provided with a supply pipe a having a depending limb a<3> provided with baffies a<1>, a<2> which are arranged to cause the liquid to flow in a zigzag path and to be thrown successively against the baffles. Liquid or gaseous reagents may be introduced through a pipe c. On leaving the limb a<4>, the liquid turns upwards, and the larger solid particles settle in a quiescent zone at the bottom of the chamber, vertical partitions b<1> being arranged over this zone. The chamber may be covered and provided with a ventilating shaft b<4>. The liquid is led from the chamber by means of troughs b<2> and passes to the second unit, consisting of a settling and decanting tank for removing fats and the finer solid particles and for completing the action of the reagents. The tank may be constructed in the manner described in Specification 9257/11, or, as shown in Specification 127,419. The tank d shown is formed with a decanting-chamber d<13> and settling-chambers d<5>, d<6> arranged under partitions d', d'. Passages formed by partitions e, e<1> are divided by partitions e<3>, e<4>, which are arranged so that the outer and inner channels converge and diverge downwards respectively. The liquid enters by inlets d', d<2>, the heavier and lighter portions entering the outer and inner channels respectively. The solid particles are carried mainly into the settling-chamber through the outer channels, and the solid particles that are carried through the inner channels are deposited owing to the slowing-down of the streams in these channels. The chamber d<13> is separated from the effluent troughs f<2>, f<3> by traps e<5>, e<6> formed bv pairs of plates. The supernatant fat is periodically run off through troughs g, g<1> by closing the outlets of the troughs f<2>, f<3> and allowing the liquid to rise. The tank is provided with a cover for excluding light, and with a ventilating-shaft d<4>. The filtering-unit comprises two sets of chambers h, h<2>, i, k, each set communicating with a chamber l provided with an outlet m for the purified liquid. The chamber h<2> is provided with a bed of iron or iron ore, which may be mixed or stratified with pebbles. The bed is supported on a grid h<7> provided with a baffle h<6>. The chambers i, k are in communication through a pipe j formed with an enlargement which communicates with a pipe j<2> for supplying air or other gases. A pipe j<4> may also be provided for supplying air &c. directly to the chamber k. The chamber i is sealed by the depending end of the pipe j. The chamber i may be omitted, in which case a sealed pipe is provided for connecting the upper end of the chamber h<2> to the lower end of the chamber k. The chamber k is provided with a bed of pebbles which is arranged over a grid k<2>. The two sets of - chambers may be used simultaneously or alternatively. The beds can be cleaned by allowing purified water from one set of chambers to run through the other set of chambers, this water being run to waste through the bottom of the chamber k. Specifications 1266/14. 5512/14, and 6855/14 also are referred to.