DECONTAMINATION
Table 1. Testing panels (substrate samples). PCN*+++
PLF+++ Painted Concrete
circular 3.6 x 1.1 9.08 cm2
Lino Floor CARC+
Chemical Agent Resist. Coating
23.22 cm2 GYB+++ Gypsum board 15.21 cm2 BUR++ Butyl rubber
square 5 x 5 x 0.2 square 5 x 5 x 0.2 square 4 x 4 x 0.6 square 5 x 5 x 0.2 24.01 cm2
24.01 cm2 SDS+++ Raw sandstone
square 3 x 3 x 1.2 8.41 cm2
*Paint type: Flügger Denmark, Flutex 1 Plus acrylate paint for indoor surfaces - white)
Agents Resistance Coating (CAR) panels is very low compared to contamination density on Sandstone (SDS) substrate. Butyl Rubber (BUR) substrate shows comparable results to Gypsum Board (GYB). Low contamination density was found on Painted Concrete and Plastic Floor (PLF). On the basis of testing results,
LVD-X decontamination technology is effective in decontamination of selected indoor building surfaces that have been contaminated by vaporized CW agents. Materials resistant to the penetration of vaporized CW agents (CAR), as well as the adsorptive materials – such as PCN and GYB – are definitely decontaminated to below contact hazard threshold level using the
LVD-X Liquids
RED MIXING PIPELINE WHITE MIXING PIPELINE
AIR FLOW (m3.h-1)
1.8–2.0 1.8
+++ by Spiez Laboratories, CH, + by CRISTANINI, ++ by VOP CZ S.p.A. GB Agent
l Vaporized GB agent shows the highest affinity towards SDS l BUR significantly retains vaporized GB agent in the material structure
l GB agent decontamination performs extremely well, particularly for PCN, CAR, and GYB
l GD agent shows the highest affinity towards the SDS l BUR and PLF significantly retain vaporized GD in the material structure
GD Agent
l GD agent decontamination results in almost all tested substrates showed very good results, with PLF and BUR substrates showing the lowest decontamination efficacy
HD Agent
l HD agent showed a high affinity towards a wide scale of substrates (except CAR) l PLF, BUR and GYB significantly retain vaporized HD in the material structure
l HD agent residuals in all of the tested substrates are well decontaminated using LVD-X technology
standard LVD-X decontamination procedure. Decontamination of organic materials such as PLF and BUR, which are
Table 2. Main operating parameters for use of the LVD-X system.
LIQUID FLOW (dm3.h-1)
3.6 4.0
Table 3. CRISTANINI LVD-X Decontamination results chart.
INDOR BUILDING SURFACES
(PCN) Painted Concrete (PLF) Plastic floor
(CARC) Chem. agent Resistant Coating
(GYB) Gypsum Board Painted
(BUR) Butyl Rubber (SDS) Sandstone
GB
Initial Cont.
(mg.m-2) 63.88
126.01 29.89
282.68
Residual Cont.
(mg.m-2) 0.73
27.28 0.12
0.66
308.21 80.46 751.89
26.14
LVD-X Decon
efficiency (%)
98.86 78.35 99.57
99.77
73.90 96.52
Initial Cont.
(mg.m-2) 306.78
142.24 6.07
206.82
337.65 649.42
CW Agent GD
Residual Cont.
(mg.m-2) 0.26
54.21 0.13
6.38
66.24 16.95
LVD-X Decon
efficiency (%)
99.92 59.07 97.90
93.62
80.36 97.39
Initial Cont.
(mg.m-2) 262.03
91.99 0.76
272.80
180.76 181.72
AIR
PRESSURE (bar)
3.8–4.8 2.0–3.0
LIQUID PRESSURE (bar)
1.9–3.2 2.5
not resistant to penetration of CW agents into their structure, is more challenging. The fixed directional nozzle for spreading LVD-X decontaminant demonstrates a significant difference in decontamination efficiency. Some samples placed in different positions resulted in less homogeneity. Experimental trials with a rotating nozzle and its delivery through a robotized platform are ongoing. This will invariably optimize the results achieved so far. zy
HD
Residual Cont.
(mg.m-2) 0.48
36.75 0.00
5.36
15.16 1.10
LVD-X Decon
efficiency (%)
99.82 60.05
100,00 94.64
91.61 99.39
(Testing panels placed directly in ‘front’ of the LVD-X flow show significantly higher decontamination efficiency compared with ‘side’ samples).
Renato Bonora is Professor of Contaminated Site Remediation, Department of Industrial Engineering, University of Padua. He has worked on CBRN decontamination and detoxification technologies since 1988.
60 CBNW 2013/02
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