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

Castro, Rodrigo José de; Kehl, Gustavo Delmar; Candaten, Luana; Santos, Germana Davila dos; Silva, Paulo Roberto Bairros da; Trevisan, Rômulo; Wastowski, Arci Dirceu

doi:10.1590/S1413-415220190319

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Technical Article • Eng. Sanit. Ambient. 26 (2) • Mar-Apr 2021 • https://doi.org/10.1590/S1413-415220190319 copy

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

Eletro-remoção de cobre, cromo e arsênico de resíduos de madeira tratada com arseniato de cobre cromado

Authorship SCIMAGO INSTITUTIONS RANKINGS

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.

Keywords
environmental risk; solid waste; chemical species; dispersive energy x-ray fluorescence spectrometry

Factors	Levels
Factors	(-)	(+)
1. Time (minutes)	20	60
2. Mass (grams)	5	15
3. Voltage (Volts)	10	25

Treatment	Factor 1	Factor2	Factor 3	R1	R2	R3	Rm
(Chrome)	(Time)	(Mass)	(Voltage)	(mg kg⁻¹)	(mg kg⁻¹)	(mg kg⁻¹)	(mg kg⁻¹)
1	–	–	–	61.6	64.1	71	65.6
2	+	–	–	81.9	60.9	72.8	71.9
3	–	+	–	66.3	89.3	82.1	79.2
4	+	+	–	38.6	39.2	49.1	42.3
5	–	–	+	40.5	42.5	39	40.7
6	+	–	+	13.7	17	17	15.9
7	–	+	+	17.4	16.3	18	17.2
8	+	+	+	16.4	16.6	16.7	16.6
(Copper)
1	–	–	–	27	27.8	28.2	27.6
2	+	–	–	31.4	24.7	29	28.4
3	–	+	–	32.3	41.7	39	37.7
4	+	+	–	18.2	18	20.3	18.8
5	–	–	+	15.5	16.1	15.1	15.6
6	+	–	+	10.3	13	13	12.1
7	–	+	+	15	15.1	16.3	15.5
8	+	+	+	21.4	30.9	15.7	22.7
(Arsenic)
1	–	–	–	89.8	101.1	119.1	103.3
2	+	–	–	131.9	95.8	102.3	110
3	–	+	–	105.1	130.3	134.3	123.2
4	+	+	–	82	66.3	81.7	76.7
5	–	–	+	34.9	51.9	42.4	43.1
6	+	–	+	15.8	20.4	20.8	19
7	–	+	+	32.5	42	32.9	35.8
8	+	+	+	33.6	39.3	35	36

Analyte	MR (mg kg⁻¹)	x (mg kg⁻¹)	CV (%)	E (%)	DML	Z-score
Cu	10 ± 0.04	10.1 ± 0.3	3.4	0.6	0.3	0.1
Cr	50 ± 0.2	52.8 ± 1.7	6.4	5.7	8.9	0.8
As	63.5 ± 2.7	63.1 ± 1.6	4.9	−0.7	4.5	−0.1

	CHROME
	Sum of sqrs	DF	F	p
Between groups	31,530.8	8	84.3	1.1 × 10⁻¹²
Within groups	841.847	18
Total	32,372.7	26

	CHROME
	Sum of sqrs	DF	F	p
Between groups	5,136.3	8	42.2	4.2 × 10⁻¹⁸
Within groups	273.9	18
Total	5,410.2	26

	CHROME
	Sum of sqrs	DF	F	p
Between groups	73,761.2	8	50.8	8.7 × 10⁻¹¹
Within groups	3,267.41	18
Total	7,7028.6	26

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E-mail: esa@abes-dn.org.br

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[1] * Corresponding author: paulo.bairros-silva@ufsm.br