Dejonghe, P.

Lopes Cardozo, R.

Archive of European Integration

i i ™ m I •»■f REPRINT !nS ¡sffl I *3 B4*«r m ι. *.« Hfl EUROPEAN ATOMIC ENERGY COMMUNITY ­ EURATOM m ·»« j;(i»|«m¡»ífj Hzn.1 m w [*♦» M'M i awi ¡d;/« p.^disili υ DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION :aas » " # HUI itrf »ft W ¥>·»:·*: si P. DEJONGHE and R. LOPES CARDOZO (Belchim) (Euratom) MWWHU' ilCi ra !¡ s te ";.-*;' 5ffl »*i[rWf m ■ . . » . ;m [MA m " i f f : W ì»f.i Ri sf j Ht' M feu ft ï1 WR'if.'fi ï-tk.ShV'^ •umitii i ¡>ß*!|fl PRISM». .■MU fe™ SUS'* ΙΜΗΓ·: ffl :*4a:^ öi Joint Nuclear Research Centre Ispra Establishment ­ Italy Materials Department Organic Chemistry Service m m Reprinted from NATURE V o l . 1 9 9 - N o . 4 8 9 4 - 1963 >w ¥ ,l.¡ V' tämm f i ¡ « t * ¿ ■ΐ»ι>ι»ΐ!·:ιΜΐι ι )Ι·Λ·: ean Iew"l1«-BM«:«?í-t(" l **Ψ 'í.';«i SS'fi 3M1' This document was prepared under the sponsorship of the Commission of the Europi Atomic Energy Community (EURATOM).; ' »pj-..^ ' ™ΐ.··^5Π·$·4{^ί^ Neither the EURATOM Commission, its contractors nor any person acting on their behalf: Make any warranty or representation, express or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this document, or that the use of any information, apparatus, method, or infringe privately owned rights; or process disclosed in this document may not 2o _ Assume any liability with respect to the use of, or for damages resulting from the use of any information, apparatus, method or process disclosed in this document. The authors' names are listed in alphabetical order. íei»3S'.i.*átfaJtÍIa?-ip»ííBÍ:> i^¥ ÙM m 'Ά •m Ui.il ií J! 15ffi Γ »ΛΨ • H'M'siíttKlrMMRH' ^f^iíá'ti ¿rTÌs tø < Pil i «¡il This reprint is intended for restricted distribution only. It reproduces, by kind permission of the publisher, an article from "NATURE", Vol. 199, No. 4894 ­ 1963, 687­688. For further copies please apply to Fisher, Knight & Co Ltd. ­ Gainsborough Press — Lattimore Road ­St. Albans (England). Dieser Sonderdruck ist für eine beschränkte Verteilung bestimmt. Die Ä m JíWmí Knight & Co Ltd. ­ Gainsborough Press — Lattimore Road ­ St. Albans (England), zu richten. m m Ce tiré­à­part est exclusivement destiné à une diffusion restreinte. Il iE !!<«■ lift éprend, avec l'aimable autorisation de l'éditeur, un article publié dans «NATURE», Vol. 199, iV° 4894 ­ 1963, 687­688. Tout autre exem­plaire de cet article doit être demandé à Fisher, Knight & Co Ltd. ­Gainsborough Press —■ Lattimore Road ­ St. Albans (England). im ■■<■■ uesto estratto è destinato esclusivamente ad una diffusione limitata. Esso è stato riprodotto, per gentile concessione dell'Editore, da «NATURE», Voi. 199, iV° 4894 ­ 1963, 687­688. Ulteriori copie dell'articolo debbono essere richieste a Fisher, Knight & Co Ltd. ­m. Gainsborough Press — Lattimore Road ­ St. Albans (England). Deze overdruk is slechts voor beperkte verspreiding bestemd. Het artike, > met welwillende toestemming van de uitgever overgenomen uit „NATURE", Vol. 199, No. 4894 ­ 1963, 687­688. Meer exemplaren kunnen besteld worden bij Fisher, Knight & Co Ltd. ­ Gainsborough Press ­­ Lattimore Road ­ St. Albans (England). JSmmSå km E U R 5 0 2 . e REPRINT DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION by P. DEJONGHE (Belchim) and R. LOPES CARDOZO (Euratom). European Atomic Energy Community - EURATOM Joint Nuclear Research Centre Ispra Establishment - Italy Materials Department Organic Chemistry Service Reprinted from "NATURE" Vol. 199 - No 4894 - 1963 - 687-688 pages. Summary not available. E U R 5 0 2 . e REPRINT DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION by P. DEJONGHE (Belchim) and R. LOPES CARDOZO (Euratom). European Atomic Energy Community - EURATOM Joint Nuclear Research Centre Ispra Establishment - Italy Materials Department Organic Chemistry Service Reprinted from "NATURE" Vol. 199 - No 4894 - 1963 - 687-688 pages. Summary not available. E U R 5 0 2 .e REPRINT DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION by P. DEJONGHE (Belchim) and R. LOPES CARDOZO (Euratom). European Atomic Energy Community - EURATOM Joint Nuclear Research Centre Ispra Establishment - Italy Materials Department Organic Chemistry Service Reprinted from "NATURE" Vol. 199 - No 4894 - 1963 - 687-688 pages. Summary not available. (Reprinted from Nature, Vol. 199, No. 4894. pp. 687-688. August 17, 1963) Decontamination of Synthetic Effluent by Flotation I N T E R E S T E D b y t h e c o m m u n i c a t i o n of Sebba 1 , somo scann ing t e s t s were u n d e r t a k e n in o rder to a sce r t a in w h e t h e r t h e flotation of ions could be used for t h e decon-t a m i n a t i o n of r ad ioac t ive effluent. T h e resul t s o b t a i n e d m a y bo considered as be ing ind ica t ive a n d of l imi ted va lue only, owing t o t h e fact t h a t no special efforts h a v e been m a d e to achieve o p t i m a l condi t ions , t o use foam s t ab i -lizers, e tc . T h e glass flotation cell used is i l l u s t r a t ed in F ig . 1. E n c o u r a g i n g resu l t s h a v e boen o b t a i n e d b y use of a foam co lumn of 60 c m a n d b y i n t r o d u c i n g t h e su r f ac t an t , t h a t is . sod ium laury l s u l p h a t e , 25 c m u n d e r n e a t h t h e l iquid inlet . T h e foam co lumn p r o v e d t o b e v e r y s t ab l e a t joH = 2 if dist i l led w a t e r was used for offluent m a k o - u p . W h e n t a p wa te r , con ta in ing a b o u t 40 p . p . m . Ca21·, was used, loss-s tab le co lumns were ob ta ined . I n t h i s case, a foam stabil izer should be used. E a c h r u n las ted a t least 2 h ; equ i l i b r ium was a t t a i n e d after 1 h . Some resu l t s a re g iven in T a b l e 1. I t a p p e a r s t h a t d e c o n t a m i n a t i o n b y s t r a i g h t ion flotation is h igh for E u 3 + a n d re la t ive ly low for Sr-+ a n d Cs+ . I n order t o i m p r o v e t h e Cs + d e c o n t a m i n a t i o n , a copper fer rocyanida N o . 1 2 3 4 5 0 7 8 ¡1 1 0 1 1 12 1 3 T r a c e r ' " C s 1 3 l C s " ' C s l a j C s 1 3 1 Cs " S r " s 9 S r 8 »Sr s 3 S r l s = E u " = E I P l s s E u l ä S E i l C a r r i e r ( p . p . r a . ) 1 " — 1 — — — — 1 — 1 — 1 C h e m i e Cu=+ ( p . p . m . ) — — 1 5 1 1 5 - 1 15 -1 — — 1 5 1 15 -1 — — 1 5 1 15 -1 a l s a d d e d F e ( C N ) ; ' r ( p . p . m . ) 11 -5 U S 11-5 — — 11-5 11-5 — — 11 5 11-5 D e c o n t a m i n a t i o n f a c t o r * F l o t a t i o n 1-4 + 0-2 1 1 ± 0 0 3 7 5 ± 1 2 5 no ± 30 2 5 + 0 F l o c c u l a t i o n — — 1 5 0 + 5 0 4 5 + 20 32 ± 6 2 5 ± 0 - 5 J 2-4 t i l l ! — 1-7 ± 0 - 3 1-8 + 0 1 1-3 + 0-2 ! 1-1 + 0-1 3 3 0 + 1 5 0 ' — 4 0 0 + ilO t — 2 0 0 + 0 0 ! l-G + 0-2 7 5 0 + 2 5 0 1 1 + 0 - 0 Flotation runs, pll = 2; 25 p.p.m. sodium lauryl sulphate; distilled water, except No. 5, where tap water was used; liquid How-rate, 0-7 m/h; air flow-rate, 1 m/h, except No. 5, 1-55 m/h. Flocculation runs, in beakers under slow stirring during 0-5 h; distilled water; phase separation by cent rifu gation directly after stirring; JJH = 2. All decontamination factors arc average values from two or more runs; during each run three or more samples were taken after 1 h of operation when equilibrium was attained. * Concentration column influent over effluent. FOAM OUT LIQUID IN igi­ni ^ i =50 INTERFACE SINTERED GLASS PLATE LIQUID OUT > i L 110 AIR IN Fit ' . 1. F lo ta t ion cell ( x 0­1). Λ , Distance from liquid inlet ; from air inlet lì, distance floccLilo w a s formed i n t h e s o l u t i o n . I t a p p e a r e d t h a t t h o i o n f l o t a t i o n o f E u s + i s n o t a f f e c t e d b u t t h a t t h e C s + d e c o n t a m i n a t i o n i m p r o v e d m a r k e d l y . Sr 2 + d e c o n t a m ­i n a t i o n r e m a i n s a l m o s t u n c h a n g e d , w h i c h b e c o m e s u n d e r ­s t a n d a b l e a f t e r c o m p a r i n g t h o f l o t a t i o n r e s u l t s w i t h t h o r e f e r e n c e flocculation r u n s t h a t w e r e e x e c u t e d s i m u l ­t a n e o u s l y u n d e r c o m p a r a b l e c o n d i t i o n s . I n e v e r y e a s e t h o e f f l u e n t f r o m t h e col l w a s c o m p l e t e l y c l e a r a n d c o n ­t a i n e d n o floccules. O n t h o w h o l e , flotation g i v e s e q u a l o r b e t t e r r e s u l t s t h a n d o e s f l o c c u l a t i o n . I t is n o t e d t h a t t h o flocculation, esjDOcially o f S r 2 + a n d E u 3 + f o r w h i c h o t h e r c h e m i c a l t r e a t m e n t s g i v e b o t t e r r e s u l t s , w a s d o n e u n d e r r e l a t i v e l y u n f a v o u r a b l e c o n d i t i o n s , s i n c e a t p H = 2 o n l y c o p p e r f e r r o c y a n i d e c o u l d b e f o r m e d a s p r e c i p i t a t e , a n d t h i s is a spec i f i c s c a v e n g e r fo r C s + o n l y . I t i s . h o w e v e r , v e r y l i k e l y t h a t if f a v o u r a b l e c o n d i t i o n s c a n b o f o u n d , t h e s a m e c o n c l u s i o n w i l l b o a r r i v e d a t , a l t h o u g h t h e i n f l u e n c e o f o t h e r c o n t a m i n a n t s p r e s e n t i n w a s t e e f f l u e n t , s u c h a s o r g a n i c m a t e r i a l s , is u n k n o w n . A n i n t e r e s t i n g r e s u l t o f t h e flotation r u n s w a s t h a t t h o s e p a r a t e d f o a m v o l u m e r e p r e s e n t e d a v e r y s m a l l p a r t o f t h e v o l u m e o f e f f l u e n t t r e a t e d . T h o avo ra s ro v a l u e o b t a i n e d for m o r e t h a n 30 r u n s was 0 0 1 vol. per cen t . T h i s is of g rea t i m p o r t a n c e for t h e t r e a t m e n t of r ad ioac t ive effluent s ince tho c o n c e n t r a t e d r ad ioac t ive vjhase, foam + flocculo. can poss ibly be s tored insolubil ized or con ta ined w i t h o u t a n y fur ther vo lume reduc t ion . R . Loi'ES C A R D O Z O C.C.R. E u r a t o m , I s p r a . I t a l y . P . D E J O X G H E Belch im. c/o C.E.N. . Mol. Be lg ium, ' Sebba, ¥.. Sature, 184, Supp . 14, 1002 (1951)); Ion Flotation (Elsevier) . Printed in Great Britain by Fisher, Knight Λ Co., Ltd., St. Albans Ei-jfcf mmÊF ítiUÍMí*'!*'" . „ lilePI IIP _ τ ^ mr "fir CDNA00502ENC ti M':!J'W'j';^ i OT^iWr' i 

DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION. EUR 502.e

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DECONTAMINATION OF SYNTHETIC 
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P. DEJONGHE and R. LOPES CARDOZO 
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Joint Nuclear Research Centre 
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Organic Chemistry Service 
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Reprinted from 
NATURE 
V o l . 1 9 9 - N o . 4 8 9 4 - 1963 
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Iew"l1«-BM«:«?í-t(" l **Ψ 'í.';«i SS'fi 3M1' 
This document was prepared under the sponsorship of the Commission of the Europi 
Atomic Energy Community (EURATOM).; ' 
»pj-..^ ' ™ΐ.··^5Π·$·4{^ί^ 
Neither the EURATOM Commission, its contractors nor any person acting on their behalf: 
Make any warranty or representation, express or implied, with respect to the accuracy, 
completeness, or usefulness of the information contained in this document, or that the use 
of any information, apparatus, method, or 
infringe privately owned rights; or 
process disclosed in this document may not 
2o _ Assume any liability with respect to the use of, or for damages resulting from the use of 
any information, apparatus, method or process disclosed in this document. 
The authors' names are listed in alphabetical order. íei»3S'.i.*átfaJtÍIa?-ip»ííBÍ:> i^¥ 
ÙM 
m 
'Ά •m Ui.il 
ií J! 15ffi Γ »ΛΨ • H'M'siíttKlrMMRH' ^f^iíá'ti ¿rTÌs tø < Pil i «¡il 
This reprint is intended for restricted distribution only. It reproduces, 
by kind permission of the publisher, an article from "NATURE", 
Vol. 199, No. 4894 ­ 1963, 687­688. For further copies please apply to 
Fisher, Knight & Co Ltd. ­ Gainsborough Press — Lattimore Road ­
St. Albans (England). 
Dieser Sonderdruck ist für eine beschränkte Verteilung bestimmt. Die 
Ä 
m 
JíWmí 
Knight & Co Ltd. ­ Gainsborough Press — Lattimore Road ­ St. Albans 
(England), zu richten. 
m 
m 
Ce tiré­à­part est exclusivement destiné à une diffusion restreinte. Il 
iE !!<«■ lift 
éprend, avec l'aimable autorisation de l'éditeur, un article publié dans 
«NATURE», Vol. 199, iV° 4894 ­ 1963, 687­688. Tout autre exem­
plaire de cet article doit être demandé à Fisher, Knight & Co Ltd. ­
Gainsborough Press —■ Lattimore Road ­ St. Albans (England). 
im 
■■<■■ uesto estratto è destinato esclusivamente ad una diffusione limitata. 
Esso è stato riprodotto, per gentile concessione dell'Editore, da 
«NATURE», Voi. 199, iV° 4894 ­ 1963, 687­688. Ulteriori copie 
dell'articolo debbono essere richieste a Fisher, Knight & Co Ltd. ­
m. Gainsborough Press — Lattimore Road ­ St. Albans (England). 
Deze overdruk is slechts voor beperkte verspreiding bestemd. Het artike, 
> met welwillende toestemming van de uitgever overgenomen uit 
„NATURE", Vol. 199, No. 4894 ­ 1963, 687­688. Meer exemplaren 
kunnen besteld worden bij Fisher, Knight & Co Ltd. ­ Gainsborough 
Press ­­ Lattimore Road ­ St. Albans (England). 
JSmmSå 
km 
E U R 5 0 2 . e 
REPRINT 
DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION 
by P. DEJONGHE (Belchim) and R. LOPES CARDOZO (Euratom). 
European Atomic Energy Community - EURATOM 
Joint Nuclear Research Centre 
Ispra Establishment - Italy 
Materials Department 
Organic Chemistry Service 
Reprinted from "NATURE" Vol. 199 - No 4894 - 1963 - 687-688 pages. 
Summary not available. 
E U R 5 0 2 . e 
REPRINT 
DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION 
by P. DEJONGHE (Belchim) and R. LOPES CARDOZO (Euratom). 
European Atomic Energy Community - EURATOM 
Joint Nuclear Research Centre 
Ispra Establishment - Italy 
Materials Department 
Organic Chemistry Service 
Reprinted from "NATURE" Vol. 199 - No 4894 - 1963 - 687-688 pages. 
Summary not available. 
E U R 5 0 2 .e 
REPRINT 
DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION 
by P. DEJONGHE (Belchim) and R. LOPES CARDOZO (Euratom). 
European Atomic Energy Community - EURATOM 
Joint Nuclear Research Centre 
Ispra Establishment - Italy 
Materials Department 
Organic Chemistry Service 
Reprinted from "NATURE" Vol. 199 - No 4894 - 1963 - 687-688 pages. 
Summary not available. 

(Reprinted from Nature, Vol. 199, No. 4894. pp. 687-688. 
August 17, 1963) 
Decontamination of Synthetic Effluent by 
Flotation 
I N T E R E S T E D b y t h e c o m m u n i c a t i o n of Sebba 1 , somo 
scann ing t e s t s were u n d e r t a k e n in o rder to a sce r t a in 
w h e t h e r t h e flotation of ions could be used for t h e decon-
t a m i n a t i o n of r ad ioac t ive effluent. T h e resul t s o b t a i n e d 
m a y bo considered as be ing ind ica t ive a n d of l imi ted va lue 
only, owing t o t h e fact t h a t no special efforts h a v e been 
m a d e to achieve o p t i m a l condi t ions , t o use foam s t ab i -
lizers, e tc . 
T h e glass flotation cell used is i l l u s t r a t ed in F ig . 1. 
E n c o u r a g i n g resu l t s h a v e boen o b t a i n e d b y use of a foam 
co lumn of 60 c m a n d b y i n t r o d u c i n g t h e su r f ac t an t , t h a t is . 
sod ium laury l s u l p h a t e , 25 c m u n d e r n e a t h t h e l iquid inlet . 
T h e foam co lumn p r o v e d t o b e v e r y s t ab l e a t joH = 2 if 
dist i l led w a t e r was used for offluent m a k o - u p . W h e n t a p 
wa te r , con ta in ing a b o u t 40 p . p . m . Ca21·, was used, loss-
s tab le co lumns were ob ta ined . I n t h i s case, a foam 
stabil izer should be used. E a c h r u n las ted a t least 
2 h ; equ i l i b r ium was a t t a i n e d after 1 h . 
Some resu l t s a re g iven in T a b l e 1. I t a p p e a r s t h a t 
d e c o n t a m i n a t i o n b y s t r a i g h t ion flotation is h igh for 
E u 3 + a n d re la t ive ly low for Sr-+ a n d Cs+ . I n order t o 
i m p r o v e t h e Cs + d e c o n t a m i n a t i o n , a copper fer rocyanida 
N o . 
1 
2 
3 
4 
5 
0 
7 
8 
¡1 
1 0 
1 1 
12 
1 3 
T r a c e r 
' " C s 
1 3 l C s 
" ' C s 
l a j C s 
1 3 1 Cs 
" S r " 
s 9 S r 
8 »Sr 
s 3 S r 
l s = E u 
" = E I P 
l s s E u 
l ä S E i l 
C a r r i e r 
( p . p . r a . ) 
1 
" — 1 
— — — — 1 
— 1 
— 1 
C h e m i e 
Cu=+ 
( p . p . m . ) 
— 
— 1 5 1 
1 5 - 1 
15 -1 
— — 1 5 1 
15 -1 
— — 1 5 1 
15 -1 
a l s a d d e d 
F e ( C N ) ; ' r 
( p . p . m . ) 
11 -5 
U S 
11-5 
— — 11-5 
11-5 
— — 11 5 
11-5 
D e c o n t a m i n a t i o n 
f a c t o r * 
F l o t a t i o n 
1-4 + 0-2 
1 1 ± 0 0 
3 7 5 ± 1 2 5 
no ± 30 
2 5 + 0 
F l o c c u l a t i o n 
— 
— 1 5 0 + 5 0 
4 5 + 20 
32 ± 6 
2 5 ± 0 - 5 J 
2-4 t i l l ! — 
1-7 ± 0 - 3 1-8 + 0 1 
1-3 + 0-2 ! 1-1 + 0-1 
3 3 0 + 1 5 0 ' — 
4 0 0 + ilO t — 
2 0 0 + 0 0 ! l-G + 0-2 
7 5 0 + 2 5 0 1 1 + 0 - 0 
Flotation runs, pll = 2; 25 p.p.m. sodium lauryl sulphate; distilled 
water, except No. 5, where tap water was used; liquid How-rate, 0-7 m/h; 
air flow-rate, 1 m/h, except No. 5, 1-55 m/h. Flocculation runs, in beakers 
under slow stirring during 0-5 h; distilled water; phase separation by 
cent rifu gation directly after stirring; JJH = 2. 
All decontamination factors arc average values from two or more runs; 
during each run three or more samples were taken after 1 h of operation 
when equilibrium was attained. 
* Concentration column influent over effluent. 
FOAM OUT 
LIQUID IN 
igi­ni 
^ i =50 
INTERFACE 
SINTERED 
GLASS PLATE 
LIQUID OUT > i L 
110 
AIR IN 
Fit ' . 1. F lo ta t ion cell ( x 0­1). Λ , Distance from liquid inlet ; from air inlet lì, distance 
floccLilo w a s formed i n t h e s o l u t i o n . I t a p p e a r e d t h a t t h o 
i o n f l o t a t i o n o f E u s + i s n o t a f f e c t e d b u t t h a t t h e C s + 
d e c o n t a m i n a t i o n i m p r o v e d m a r k e d l y . Sr 2 + d e c o n t a m ­
i n a t i o n r e m a i n s a l m o s t u n c h a n g e d , w h i c h b e c o m e s u n d e r ­
s t a n d a b l e a f t e r c o m p a r i n g t h o f l o t a t i o n r e s u l t s w i t h t h o 
r e f e r e n c e flocculation r u n s t h a t w e r e e x e c u t e d s i m u l ­
t a n e o u s l y u n d e r c o m p a r a b l e c o n d i t i o n s . I n e v e r y e a s e 
t h o e f f l u e n t f r o m t h e col l w a s c o m p l e t e l y c l e a r a n d c o n ­
t a i n e d n o floccules. O n t h o w h o l e , flotation g i v e s e q u a l 
o r b e t t e r r e s u l t s t h a n d o e s f l o c c u l a t i o n . I t is n o t e d t h a t 
t h o flocculation, esjDOcially o f S r 2 + a n d E u 3 + f o r w h i c h 
o t h e r c h e m i c a l t r e a t m e n t s g i v e b o t t e r r e s u l t s , w a s d o n e 
u n d e r r e l a t i v e l y u n f a v o u r a b l e c o n d i t i o n s , s i n c e a t p H = 2 
o n l y c o p p e r f e r r o c y a n i d e c o u l d b e f o r m e d a s p r e c i p i t a t e , 
a n d t h i s is a spec i f i c s c a v e n g e r fo r C s + o n l y . I t i s . h o w e v e r , 
v e r y l i k e l y t h a t if f a v o u r a b l e c o n d i t i o n s c a n b o f o u n d , t h e 
s a m e c o n c l u s i o n w i l l b o a r r i v e d a t , a l t h o u g h t h e i n f l u e n c e 
o f o t h e r c o n t a m i n a n t s p r e s e n t i n w a s t e e f f l u e n t , s u c h a s 
o r g a n i c m a t e r i a l s , is u n k n o w n . 
A n i n t e r e s t i n g r e s u l t o f t h e flotation r u n s w a s t h a t t h o 
s e p a r a t e d f o a m v o l u m e r e p r e s e n t e d a v e r y s m a l l p a r t o f 
t h e v o l u m e o f e f f l u e n t t r e a t e d . T h o avo ra s ro v a l u e o b t a i n e d 
for m o r e t h a n 30 r u n s was 0 0 1 vol. per cen t . T h i s is of 
g rea t i m p o r t a n c e for t h e t r e a t m e n t of r ad ioac t ive effluent 
s ince tho c o n c e n t r a t e d r ad ioac t ive vjhase, foam + flocculo. 
can poss ibly be s tored insolubil ized or con ta ined w i t h o u t 
a n y fur ther vo lume reduc t ion . 
R . Loi'ES C A R D O Z O 
C.C.R. E u r a t o m , 
I s p r a . I t a l y . 
P . D E J O X G H E 
Belch im. 
c/o C.E.N. . 
Mol. Be lg ium, 
' Sebba, ¥.. Sature, 184, Supp . 14, 1002 (1951)); Ion Flotation (Elsevier) . 
Printed in Great Britain by Fisher, Knight Λ Co., Ltd., St. Albans 


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DECONTAMINATION OF SYNTHETIC EFFLUENT BY FLOTATION. EUR 502.e

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