Rapid microwave-assisted acid extraction of southern pine waste wood to remove metals from chromated copper arsenate (CCA) treatment

Holzforschung ◽  
2013 ◽  
Vol 67 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Chung Y. Hse ◽  
Todd F. Shupe ◽  
Bin Yu
Keyword(s):  
Recovery Rate ◽  
Chromated Copper Arsenate ◽  
Copper Extraction ◽  
Acid Extraction ◽  
Southern Pine ◽  
Waste Wood ◽  
Total Recovery ◽  
Wood Particles ◽  
One Step ◽  
Copper Arsenate

Abstract Recovery of metals from chromated copper arsenate (CCA)-treated southern pine wood particles was investigated by extraction in a microwave reactor with binary combinations of acetic acid (AA), oxalic acid (OxA), and phosphoric acid (PhA). Use of OxA was not successful, as insoluble copper oxalate complexes impeded copper removal. The combination of OxA and AA also had adverse effects on copper extraction. In contrast, the combination of AA and PhA enhanced the chromium recovery rate. The highest recovery rate of metals could be achieved with a mixture of 2.75% PhA and 0.5% AA at 130°C for 10 min in the microwave oven. The total recovery rate approached 100% for arsenic, 96.7% for chromium, and 98.6% for copper in a one-step process.

Speciation of arsenic and chromium in the leachate from chromated copper arsenate (CCA) type C treated southern pine (Pinus spp.)

Holzforschung ◽  
2005 ◽  
Vol 59 (2) ◽  
pp. 199-204 ◽  
Author(s):  
Weining Cui ◽  
Lisveth Flores del Pino ◽  
Thomas C. Voice ◽  
Karen Chou ◽  
D. Pascal Kamdem
Keyword(s):  
Treated Wood ◽  
Chromated Copper Arsenate ◽  
Exchange Chromatography ◽  
Southern Pine ◽  
Total Chromium ◽  
Flame Atomic Absorption Spectroscopy ◽  
Flame Atomic Absorption ◽  
Type C ◽  
Pinus Spp ◽  
Copper Arsenate

Abstract A 558-h laboratory leaching test (AWPA E-11) was carried out on both commercially and laboratory chromated copper arsenate (CCA) type C-treated southern pine. Arsenic, chromium, and copper concentrations in the leachate collected were examined. Leaching of chromium and copper from CCA-treated wood cubes were nearly undetectable using flame atomic absorption spectroscopy after 174 and 366 h, respectively. Less than 10% of the total chromium in the leachate was present as hexavalent chromium [Cr(VI)] after leaching for 30 h. Selective ion-exchange chromatography was used to speciate arsenic in the leachate. In the first 270 h, approximately 70–90% of the total arsenic in the leachate was inorganic pentavalent arsenic [As(V)] and 10–30% was inorganic trivalent arsenic [As(III)].

scholarly journals Electro-removal of copper, chromium, and arsenic from chromated copper arsenate treated waste wood

2021 ◽  
Vol 26 (2) ◽  
pp. 211-219
Author(s):  
Rodrigo José de Castro ◽  
Gustavo Delmar Kehl ◽  
Luana Candaten ◽  
Germana Davila dos Santos ◽  
Paulo Roberto Bairros da Silva ◽  
...  
Keyword(s):  
Internal Transcribed Spacer ◽  
Chemical Species ◽  
Its Region ◽  
Chromated Copper Arsenate ◽  
Waste Wood ◽  
Renewable Material ◽  
The Mean ◽  
Multiple Uses ◽  
Removal Technique ◽  
Copper Arsenate

ABSTRACT Wood is a renewable material considered eco-friendly and used for various purposes. While wood treated with chromated copper arsenate (CCA) does not deteriorate, its final disposal may entail risks due to the concentration and toxicity of the components. The removal of CCA from wood can be achieved in different ways. This study focuses on the reduction of the concentrations of Cu, Cr, and As chemical species by the electro-removal technique, aiming to obtain biomass with low deleterious potential that would allow multiple uses or safe disposal in landfills. The analytical results showed reductions of 79.5, 87.4, and 81.3% in the mean concentrations of Cu, Cr, and As, respectively. It is worth mentioning the occurrence of the fungus Xylaria sp. after treatment 6 (60 min, 5 g, and 25 V), further suggesting that the method was effective. Samples of these fungi were identified from isolates by culture in medium, DNA extraction, and sequencing of the Internal Transcribed Spacer (ITS) region.

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