Paper read befcre the Birmingham and Midland Section on January 21, I935 Sincc 1931 Cliancc S: .lriint.,, rJttl. (ii subsitliiiry con~l)any of Inipcriiil Cliciiiical Tndust.rics, J,td.) linvc iisetl ii writer \vasli tower i n t h n1)sorption system of it Iiirgc cliii~iil~er sulpliuric-ilcitl pliint. 'l'lic nictliotl Iiiis Ijcen rffcctivc in rctliicing t,lir nvcnige total acidity of t,lic pliint csit. gascs from 1 a 1 gr:iiiis per cl). ft. (expressed as SO,) to lcss t l i i i i i 0.30 grain. I n this piipcr tlic dcrelo~~nient of tlic: nict,liod is outlined, iintl pract.icnI (1ct:iils arc givrn of tlie nrrniigenirnt. nnd niotlc of operation. HISTORICAL 1kq)eiited iiicntion of thc use of ii witer-wash tower follo\ving tlic G:iy I ~~s s i i c tower of n c1iniiil)cr plant is niiidc in th! lhitisli Alkiili Inspectors' Annuiil Itcports froiii 1922 t.o 1929. Tmge-scale cspcrinicnts Ly Xcssrs. J. Niilcr k Co. of A)crclccn' wcrc supl~ortctl 197 work in tire Govcrnnieiit IJnborntory,z ii~id rC1)CiitCtl a! tention is tlriiwn to the ntlvnntiigc of sucli II prowss. Unfortuniitcly, blio Inctliotl ~i i ~ til)ii~~tl~iictl i i t so1iic works iiftcr ii short t.riiil, fiiilrirc being proIJ:ibly due to the use of old Gity I,iiss:ic towrrs coiitiiining picking contiiniin:it,ctl wi1.11 iirsenic C O I I I ] ) O I I I I ~~S . I3ct,\vcen 1923 ii1itl 1937 iug t,lic Giiy l>Iissiic, using ii liniitctl stlpply of \viitcr, and rdiirniiig tlic cflluciit to tlic system. In 1925 t,Iic: iivcriige totiil iiciclity of the esit test wiis niL3
In 3927, iiftcr sonic four yciirs' \-orking, JIcssrs.
Jlillcr giivc up tdic process owing to corrosion of tlic lendwork by t,lic ex! rcnicly p ~h t pis, contiiining siilpliiiric iind nitric iiciil mist, hiving tlic tower, nnil st,:itcd t,Iint ii I)rickworIc tower slioriltl I)c tiscxl." The process lins also I)ccii used in Anicricii. In the I3ritkli Alkali Inspectors' Ikport for 10%,5 rcfercncc is Iniidc to i i ~v:iter-~vasli process workctl i n Clcvcliind,