COMPARISON OF OXALIC ACID CLEANING RESULTS AT SRS AND HANFORD AND THE IMPACT ON ENHANCED CHEMICAL CLEANING DEPLOYMENT Page: 4 of 13
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WM2010 Conference, March 7-11, 2010, Phoenix, AZ
Table I. Tank 16 Oxalic Acid Strikes
Oxalic Acid Strike 1 Strike 2 Strike 3
Gallons seal water 22,937 27,220 20,307
(liters) (86,826) (103,039) (76,870)
41,596 46,477 5,797
Gallons water added (157,458) (175,935) (21,944)
(liters) [sprayed at 90 C] [sprayed at 90 C] [sprayed at 90 C]
Gallons oxalic acid
added 12,611 [4 wt%] 9,865 [4 wt%] 50,545 [4 wt%]
(liters) (47,738) (37,343) (191,334)
Final% acid (does not 4 wt% added, diluted 4 wt% added, diluted
include seal water) with water to 1 wt% with water to 1 wt% 4 wt%
# of pumps 3 3 3
hours of operation 40 45 48
temperature 66 59 62
Zeolite removal by oxalic acid dissolution was attempted in Tank 24 in 1985. The zeolite had
undergone a chemical reaction in the concentrated caustic solution that would have required
more oxalic acid to dissolve the material than originally planned. Two oxalic acid strikes were
completed with an in-tank neutralization and water wash between the strikes. Two slurry pumps
provided the mixing as shown in Table II. 
Table II. Tank 24 Oxalic Acid Strikes
Oxalic Acid Strike 1 Strike 2
Gallons water added 12,000 [added at 80 C]
(liters) (45,425) 0
Gallons oxalic acid 22,500 23,500
added [8 wt% added at 80 C] [8 wt%]
(liters) (85,172) (88,957)
Final % acid (does not
include seal water) 5 wt % 8 wt%
# of pumps 2 2
hours of operation 72 72
An oxalic acid cleaning campaign was conducted in Tank 5 during 2008. The campaign
consisted of two oxalic acid strikes, an oxalic acid spray wash and a water wash. The oxalic acid
strikes were completed as shown in the attached table. Mixing was only used in the first strike.
The style of mixer pump used in this application did not add water from seal bearings. The oxalic
acid was added at 60 C. Temperature in the tank was not recorded. 
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Spires, R. & Ketusky, E. COMPARISON OF OXALIC ACID CLEANING RESULTS AT SRS AND HANFORD AND THE IMPACT ON ENHANCED CHEMICAL CLEANING DEPLOYMENT, article, January 5, 2010; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc931665/m1/4/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.