SLUDGE FROM RICE PARBOILING WASTEWATER TREATMENT PLANT AS ALTERNATIVE SUBSTRATE FOR THE PRODUCTION OF <i>Araucaria angustifolia</i> SEEDLINGS

Bull, Veridiana Neitzke; Pilatti, Fernanda Kokowicz; Schwartz, Elisane; Cassana, Francine Ferreira

doi:10.1590/1806-908820210000010

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Scientific Article • Rev. Árvore 45 • 2021 • https://doi.org/10.1590/1806-908820210000010 copy

SLUDGE FROM RICE PARBOILING WASTEWATER TREATMENT PLANT AS ALTERNATIVE SUBSTRATE FOR THE PRODUCTION OF Araucaria angustifolia SEEDLINGS

LODO DE ESTAÇÃO DE TRATAMENTO DE PARBOILIZAÇÃO DE ARROZ COMO SUBSTRATO ALTERNATIVO NA PRODUÇÃO DE MUDAS DE Araucaria angustifolia

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The sludge produced by rice parboiling wastewater treatment plants has substantial amounts of nutrients and organic matter, therefore requiring proper environmental disposal. One option is to use it as an alternative substrate for the production of forest species seedlings. This study aimed to assess the viability of using the sludge from rice parboiling wastewater as an alternative substrate for the production of Araucaria angustifolia (Bertol.) O. Kuntze seedlings. A. angustifolia seeds were kept in vermiculite until sprouting, then transferred to polyethylene bags filled with five different substrates (treatments): 100% sand (T1); 75% sand and 25% sludge (T2); 50% sand and 50% sludge (T3); 25% sand and 75% sludge (T4); 100% sludge (T5). Each treatment had 10 replicates (bag with one seedling). Shoot system growth, hypocotyl diameter, root system growth and biomass were evaluated at 94, 180, and 300 days of growth. Data were subjected to Analysis of Variance (ANOVA) followed by Tukey test with a significance level of 5%. Seedlings’ growth was similar on treatments containing 25%, 50%, and 75% sludge, while 100% sand and 100% sludge resulted in less growth at 300 days. In conclusion, the sludge from rice parboiling wastewater is suitable as an alternative substrate, and the ratio of 25% sand + 75% sludge could be recommended, for exploit larger amounts of the residue.

Keywords:
Biosolids; Industrial waste; Plant growth

Table 1 Physicochemical characterization of sludge from rice parboiling wastewater treatment.

Physicochemical
Assay	R	U	LOQ	R
Total soluble phenols	0.05	mg/L	0.01	0.01
Free liquids in total mass	< 0.1	mL	0.1	-
Soluble nitrate (expressed as N)	1.0	mg/L	0.3	10.0
Oils and greases in total mass	< 10	mg/L	10.0	-
Solids	76.4	%	0.3	-
pH in total mass	6.25	-	0-14	2 to 12.5
Soluble sulphate (expressed as SO₄)	< 1.0	mg/L	1.0	250.0
Soluble surfactants	0.760	mg/L	0.4	0.5
Metals
Assay	R	U	LOQ	R
Soluble Al	< 0.2	mg/L	0.2	0.2
Soluble Cu	< 0.05	mg/L	0.05	2.0
Soluble Fe	8.5	mg/L	0.1	0.3
Soluble Na	43.7	mg/L	1.0	200.0
Soluble Zn	0.180	mg/L	0.1	5.0

Table 2 Main shoot height (MSH), shoot system total length (SSTL), and hypocotyl diameter (HD) of Araucaria angustifolia seedlings at 94, 180 and 300 days of growth in different ratios of sand and sludge from rice parboiling wastewater treatment.

	MSH			SSTL			HD
Treatment/Days	94	180	300	94	180	300	94	180	300
T1	15.09ab	19.73b	18.69c	15.09ab	29.03b	30.68c	0.60ns	0.60ns	0.60c
T2	16.01ª	26.01a	33.86ab	16.01ª	48.49a	116.07ab	0.61	0.64	0.85a
T3	14.73ab	25.87a	35.85a	14.73ab	40.74a	107.11ab	0.61	0.61	0.78ab
T4	15.94ª	28.62a	34.25ab	15.94ª	51.89a	131.17a	0.59	0.65	0.75ab
T5	13.00b	25.67a	29.08b	13.00b	45.60a	83.03b	0.55	0.64	0.73b

Table 3 Main root length (MRL), number of lateral roots (NLR), lateral roots average length (LRAL), and root system total length (RSTL) of Araucaria angustifolia seedlings at 94, 180 and 300 days of growth in different ratios of sand and sludge from rice parboiling wastewater treatment.

Treatment/	MRL			NRL			LRAL			RSTL
Days
	94	180	300	94	180	300	94	180	300	94	180	300
T1	15.37ns	29.25ns	31.83ab	20.60ns	50.4a	52.70a	8.10ns	6.44ns	7.39ab	154.10a	343.54a	418.85a
T2	17.90	29.89	32.93a	23.10	42.8ab	53.10a	7.39	7.15	7.91a	159.16a	337.21ab	434.93a
T3	14.78	27.20	26.38ab	16.0	30.8c	34.40b	4.87	6.30	6.96ab	90.60b	218.51c	260.62b
T4	16.59	23.65	23.50b	17.0	38.4bc	37.50b	4.61	5.73	5.60b	91.15b	241.67bc	232.71b
T5	20.51	30.36	26.33ab	19.10	28.4c	34.0b	4.91	6.51	5.60b	110.14ab	209.42c	216.29b

Table 4 Shoots fresh matter (SFM), main root fresh matter (MRFM), and lateral roots fresh matter (LRFM), for Araucaria angustifolia seedlings at 94, 180 and 300 days of growth in different ratios of sand and sludge from rice parboiling wastewater treatment.

	SFM (g)			MRFM (g)			LRFM (g)
Treatment/Days	94	180	300	94	180	300	94	180	300
T1	3.88b	8.24b	7.91c	2.00ns	3.75ns	4.89b	1.25ns	3.32ns	4.53b
T2	5.62a	22.47a	36.62a	1.42	4.1	8.42a	1.10	4.67	12.42a
T3	4.71ab	19.16a	35.12ab	1.38	3.14	6.36ab	0.92	3.35	6.49b
T4	5.27ab	25.65a	37.01a	1.39	3.32	4.95b	0.70	3.51	5.06b
T5	3.71b	20.24a	25.5b	1.45	3.73	5.57b	0.70	2.94	4.12b

Table 5 Shoots dry matter (SDM), main root dry matter (MRDM), and lateral roots dry matter (LRDM) for Araucaria angustifolia seedlings at 94, 180 and 300 days of growth in different ratios of sand and sludge from rice parboiling wastewater treatment.

	SDM (g)			MRDM (g)			LRDM (g)
Treatment/Days	94	180	300	94	180	300	94	180	300
T1	0.97ab	2.87b	2.81c	0.45ns	1.19a	1.74b	0.13a	0.69ns	0.88b
T2	1.21a	5.89a	10.62a	0.27	1.09ab	2.89a	0.09ab	0.7	2.27a
T3	0.99ab	4.71a	9.82ab	0.38	0.94ab	1.91b	0.05ab	0.6	1.13b
T4	1.12ab	6.4a	9.89ab	0.27	0.89b	1.59b	0.02b	0.58	0.95b
T5	0.79b	5.01a	7.04b	0.25	0.98ab	1.57b	0.03b	0.49	0.72b

Sociedade de Investigações Florestais Universidade Federal de Viçosa, CEP: 36570-900 - Viçosa - Minas Gerais - Brazil, Tel: (55 31) 3612-3959 - Viçosa - MG - Brazil
E-mail: rarvore@sif.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author.