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INTRODUCTION The recovery time of degraded areas is slow and related to the physical, chemical and biological restoration of soil capacity. The application of organic materials, such as sewage sludge, improves such capacity in the long term, and this practice decreases the use of mineral fertilizers and contributes to save energy and natural resources. Despite the benefits of sewage sludge application to soils, the presence of several pollutants in sludge, such as heavy metals and pathogenic organisms, become a problem to people and environment. MATERIALS E METHODS The experiment was conducted at “Entre Rios” Farm from Suzano Bahia Sul Company, in Itatinga, São Paulo State, Brazil. The treatments were: doses of sewage sludge on a dry basis (2.5, 5, 10, 15 and 20 Mg ha-1 + K supplementation), conventional fertilization (NPK) and control. Nine species of the Atlantic Forest were tested: Croton floribundus, Schinus terebinthifolius , Peltophorum dubium, Cedrella fissilis, Guazuma ulmifolia, Anadenanthera macrocarpa , Copaifera langsdorffii, Hymenaea courbaril and Cariniana estrellensis . Figure 3 shows the methodology of soil preparation and sludge application. RESULTS E DISCUSSION CONCLUSIONS Higher doses of sludge increased the total and available heavy metals in soil. However, until the dose of 20 Mg ha -1 , the presence of metals was not detected in foliar analysis carried out up to 18 months after sludge application. The levels of heavy metals available in the soil remained below the limit allowed by Brazilian and international laws. OBJETIVES The objective of this study was to assess possible contamination by heavy metals in a degraded area of sandy soil after application of increasing doses of sewage sludge in order to recover it. HEAVY METAL CONCENTRATION IN A DEGRADED SOIL AFTER SEWAGE SLUDGE APPLICATION. IRAÊ AMARAL GUERRINI (1) ; THALITA FERNANDA SAMPAIO; JULIO CESAR BOGIANI; CLARICE BACKES; NAYARA CRISTINA DE CARVALHO . (1) Universidade Estadual Paulista/UNESP, Campus de Botucatu - SP, CEP: 18610- 307, [email protected] 2011 SSSA-CSSA-ASA Annual Meetings - Oct. 16-19, 2011 San Antonio, TX. FIGURE 1. Total teor of Cd and Hg in the soil 6 months after sludge application. FIGURE 2. Total teor of Cd e Hg in the soil 12 months after sludge application. Figura 3. Soil preparation and sludge application. ACKNOWLEDGEMENTS: y = -0,9972x 2 + 26,692x+ 41,12 R 2 = 0,89* y = -0,2765x 2 + 7,4x+ 51,261 R 2 = 0,69* 0 50 100 150 200 250 300 0 5 10 15 20 Sew age sludge doses, M g ha -1 Total concentration, μg kg -1 Cadm ium Mercury y = 0,0181x 2 + 19,321x+ 34,949 R 2 = 0,94** y = 3,8211x+ 90,316 R 2 = 0,71** 0 50 100 150 200 250 300 350 400 450 500 0 5 10 15 20 Sewagesludgedoses, M g ha -1 Total concentration, μg kg -1 Cadm ium Mercury

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2011 SSSA-CSSA-ASA Annual Meetings - Oct. 16-19, 2011 San Antonio, TX. HEAVY METAL CONCENTRATION IN A DEGRADED SOIL AFTER SEWAGE SLUDGE APPLICATION . IRAÊ AMARAL GUERRINI (1) ; THALITA FERNANDA SAMPAIO; JULIO CESAR BOGIANI; CLARICE BACKES; NAYARA CRISTINA DE CARVALHO . - PowerPoint PPT Presentation

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Page 1: INTRODUCTION

INTRODUCTION

The recovery time of degraded areas is slow and related to the physical, chemical and biological restoration of soil capacity. The application of organic materials, such as sewage sludge, improves such capacity in the long term, and this practice decreases the use of mineral fertilizers and contributes to save energy and natural resources. Despite the benefits of sewage sludge application to soils, the presence of several pollutants in sludge, such as heavy metals and pathogenic organisms, become a problem to people and environment.

MATERIALS E METHODS

The experiment was conducted at “Entre Rios” Farm from Suzano Bahia Sul Company, in Itatinga, São Paulo State, Brazil. The treatments were: doses of sewage sludge on a dry basis (2.5, 5, 10, 15 and 20 Mg ha-1 + K supplementation), conventional fertilization (NPK) and control. Nine species of the Atlantic Forest were tested: Croton floribundus, Schinus terebinthifolius, Peltophorum dubium, Cedrella fissilis, Guazuma ulmifolia, Anadenanthera macrocarpa, Copaifera langsdorffii, Hymenaea courbaril and Cariniana estrellensis. Figure 3 shows the methodology of soil preparation and sludge application.

RESULTS E DISCUSSION

CONCLUSIONS

Higher doses of sludge increased the total and available heavy metals in soil. However, until the dose of 20 Mg ha-1, the presence of metals was not detected in foliar analysis carried out up to 18 months after sludge application. The levels of heavy metals available in the soil remained below the limit allowed by Brazilian and international laws.

OBJETIVES

The objective of this study was to assess possible contamination by heavy metals in a degraded area of sandy soil after application of increasing doses of sewage sludge in order to recover it.

HEAVY METAL CONCENTRATION IN A DEGRADED SOIL AFTER SEWAGE SLUDGE APPLICATION.

IRAÊ AMARAL GUERRINI(1); THALITA FERNANDA SAMPAIO; JULIO CESAR BOGIANI; CLARICE BACKES; NAYARA CRISTINA DE CARVALHO .

(1) Universidade Estadual Paulista/UNESP, Campus de Botucatu - SP, CEP: 18610-307, [email protected]

2011 SSSA-CSSA-ASA Annual Meetings - Oct. 16-19, 2011 San Antonio, TX.

FIGURE 1. Total teor of Cd and Hg in the soil 6 months after sludge application.

FIGURE 2. Total teor of Cd e Hg in the soil 12 months after sludge application.

Figura 3. Soil preparation and sludge application.

ACKNOWLEDGEMENTS:

y = -0,9972x2 + 26,692x + 41,12 R

2 = 0,89*

y = -0,2765x2 + 7,4x + 51,261 R

2 = 0,69*

0

50

100

150

200

250

300

0 5 10 15 20

Sewage sludge doses, Mg ha-1

Tot

al c

once

ntra

tion,

μg

kg-1

Cadmium

Mercury

y = 0,0181x2 + 19,321x + 34,949 R

2 = 0,94**

y = 3,8211x + 90,316 R2 = 0,71**

0

50

100

150

200

250

300

350

400

450

500

0 5 10 15 20

Sewage sludge doses, Mg ha-1

Tot

al c

once

ntra

tion,

μg

kg-1

Cadmium

Mercury

mailto:[email protected]

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