The sun. [volume] (New York [N.Y.]) 1833-1916, 1892-01-17

Gs.%ssy g Ssp or p4 rs the Hsnus
trap door vas opened IA the vat cove acn a.
On sS ons
bad one. About ak grains OF feEroz1ne Isr
% q qisS . H por tns
Tho sewage disposal works of London are
handed II, aud nv tr S;sss ey
sewage Of London. has been received, into
tanks t., ssn .d below o, the
city and discharged into the lower reaches, oi
the river at favora.lc stages Of the tide. and It
side OF the, Thames was sun SO discharged.
The rrespitaton works for this side no. being y
sewage. constantly Increasing in ,Gaantity
NOV amounting TO SD,on.ND gallons per
tance Of the ont'ail below London.
pt Tss pE$'!% ms in the "rm !" xhieh
mixed with the sewags is n, not ,t simply me
lime water e.. q clear saturated solution Of
lime OF very considerable volume; the m me
wasr eSs SEN
fine and also. thoroughly, dissolved The
sewage flows into the works through three e.,
side. The lime water is run into each sewer in
q single stream. falling from the centre 81 the
shanntically With the sewage. dependence
being placed upon the natural dispersion
turbulent movement Of the flowing sewage
The c,pperas is also Ted IN a similar manner.
by u single stream. into euch sewer: the dis
The sewage. after receiving its dose Of chem
which are thirteen in number; each 81 feet
wide and LON. feet long. all being covered
Et1 when sS
ed il 1nm t there Td r sn
about high tide While this, method Of dis
charge Is the most desirable. 1t is not very sat.
tunity is given ior Judging q q purity by in
erection. samples are const antiy, being taken
ops Of the errors Of c9nstruetion was IL
building these enormously long settling tanks .E
greater Or Less portion Of this LOCO feet aS,
stea WssS Is Dsior ore s Ssri is not rsspon:
gagged 1t the time OF MY visit in various modi-
ncations and improvements OF the structures
1a s%s, OF she
gus ones 10 their operation. allowing two TO
three hours for the passage OF The sewage Tg
neededl. bnt will also cause n much larger pro-
portion OF the sludge to be deposited near the
to be applied at the opposite end to assist in
the removal Of the sludge.
Each settling tank has two circular gates.
seven feet in diameter for admitting the sew
age; and these are easily and beautifully han
up and down on hollow stationary shaft. as
ws IN the snd thG wt
to the ram. in the gate itself. novel method
has been used for drawing OF the clarified
sewage down to the sludge; Each tank has tor
oval-shaped weirs. closed at their tops by fixed
caps 10 draw OH the water the upper weir ia
lowered from its cap. and the operation Of
the limit Of its range is reuched: the second
then come: into play. and finally the third one.
Tho w-irs for all the tanks are worked from
S" or by by ps g
in each tank. and also the level OF each weir OF
each SGT. The attendant is thus enabled to
keen any weir Of tank; being discharged. a
The sludge is delivered by pipes to the
sludge house. W here it il pun ped up by CEN
trifugal pumps into settling tank to free it
after settlement, is pumped back to the lime
house. where it Is used In making the lime
water. and the remaining sludge is forced
through nipes for delivery to the vessels in
pumps. which are used for this final move
ment of he s!udge: do not seem to have been
we'll designed for their work. The, vessels for
LOCO tons each, An idea Of the magnitude OF
the operations involved will be had when it is
stated that about 10000 tons Of sludge per
week. from the north side. Of the river alone
have to be carried out to sea. And this
amount the principal assistant engineer. who
kindly showed me over the wor Ks. thought
with better and more effective working would
" 'e''"S'O '''''' ''D' p'' vi" j. +. FLAcs.