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LABORATORY METHODS for LEACHATE ANALYSIS
RESULTS
Temporal and cumulative metal leaching mass. Cumulative leaching (per ha) in control treatments were: <1 g Cu, <0.2 g Ni, <2 g Ba, <1 g Zn. Cd was never detected in control.
Fate and Transport of Metals from Biosolids Entrenched For Reclaiming Mineland with Hybrid Poplar
Katrina Lasley, Greg Evanylo, Kirill Kostyanovskiy, Matt Eick and Chao Shang Department of Crop and Soil Environmental Sciences, Virginia Tech
Biosolids sampling and monitoring schematic.
Metal
Ag Cd Pb Sn
Detection Limit, mg L-1 0.006 0.004 0.016 0.027
Total Conc.range, mg L-1
<0.006-0.046 <0.004-0.042 <0.016-0.061 <0.027
Sample Nos. 125 277 277 125
Fraction of samples whose concentration>DL
0.03 0.12 0.004 0
Analysis of metals which were infrequently detected
Filtered through 0.45 µm membrane filter for soluble metal species Digested using EPA 200.7 for total metals Analyzed by ICP-AES for Ag, Al, Ba, Be, Cd, Cu, Fe, Mn, Ni, Pb, Sn, Zn
LABORATORY METHODS for LEACHATE ANALYSIS
March 2007
August 2007
Poplar cutting establishment
Chemical fractions of Ba, Cu, Pb and Zn in anaerobically digested biosolids sampled at application (2006) and in October 2007.
Chemical fractions of Ba, Cu, Pb and Zn in lime stabilized biosolids sampled at application (2006) and in October 2007.
SUMMARY
• Lateral movement of Cd, Cu, Ni and Pb, as detected by suction lysimeters, was negligible. Zinc (at 0.21-0.34 mg/L) and Ba (at 0.29-0.78 mg/L) were detected occasionally.
• Metal leaching was highest initially and decreased with time, except for Ba. Silver, Cd, Pb and Sn rarely moved vertically.
• Leached metal fractions were primarily in the colloidal-phase.
• Biosolids stabilization type affected the metal leaching mass of only Cu, with more Cu transported from the high pH lime stabilized material, likely complexed by soluble organic matter.
• Copper was largely organically bound and Pb was found in the residual fraction of both biosolids types, and neither changed with time. More Ba was found in the residual fraction of anaerobically than lime stabilized biosolids, but neither changed with time. More Zn was organically complexed in the lime-stabilized and exchangeable and oxide-bound in the anaerobically digested biosolids, but there was little change with time in either biosolids type.
Anaerobically Digested Biosolids
Lime Stabilized Biosolids
Biosolids Property
Pollutant Concentration
Limits, PCL (mg kg-1)
Concentration (mg kg-1)
Loading Rate (kg ha-1)
Concentration (mg kg-1)
Loading Rate (kg ha-1)
Application Rate
NA NA 426,000 NA 656,000
Cd 39 2.3 1 2 0.9
Cu 1500 328 139 197 129
Ni 420 27 11.5 16 10.5
Pb 300 66 28 53 35
Zn 2800 1,473 627 490 322
Ag NA 23 9.8 10 6.6
Ba NA 442 188 195 128
Be NA <5 --- <5 ---
Sn NA 27 11 17 11
N, total Kjeldahl
NA 53,133 22,601 44,533 29,212
P NA 26,533 11,286 8,667 5,685
pH NA 8.5 NA 12.3 NA
OBJECTIVE
To assess potential environmental impact of employing the deep row incorporation of biosolids by determining movement, concentration, and speciation of trace metals in lateral and vertical directions.
INTRODUCTION Deep row incorporation (i.e. entrenching) of biosolids for
reclaiming mineland and production of a hybrid poplar bioenergy crop is an alternative utilization method whose potential advantages include:
Reduction of objectionable odors
Single high application rate to meet the lifetime N need of the crop
Avoidance of biosolids application to food chain crops
Nutrient leaching and generation of greenhouse gases are being studied by our research group, but investigation of fate and transport of 503 Rule priority metals and emerging metals of interest (i.e. Ag, Ba, Be, Sn) is needed to assess potential for groundwater impairment.
FIELD METHODS • Treatments were established on a mineral sands mine
reclamation site near the Coastal Plain-Piedmont fall line in Dinwiddie County, VA in summer 2006.
• Trenches instrumented with lysimeters were filled at two rates each with lime stabilized and anaerobically-digested biosolids.
Biosolids in trenches 0.75 m deep x 15 m long x 0.90 m wide.
Application rates of biosolids treatments.
656328426213Application Rate, Mg/ha
0.90.450.90.45Trench Width (m)
Lime Stabilized Biosolids
Anaerobically Digested Biosolids
Biosolids composition and loading rate for 90 cm trench width. (NA = not applicable.)
0
100
200
300
400
500
600
700
800
900
1000
1100
Aug. 10, 2
006
Sep. 8
, 2006
Oct. 6
, 200
6
Nov. 3, 2
006
Dec. 1
, 2006
Dec. 1
5, 2
006
Jan. 5
, 200
7
Jan. 1
9, 200
7
Feb. 9, 2
007
Mar.
2, 200
7
Mar.
23, 2
007
Apr. 13
, 200
7
May
11, 2
007
Jun. 8
, 200
7
Jul.
10, 2
007
Aug. 9, 2
007
Sep. 7
, 2007
Oct. 1
2, 2
007
Time (months)
Cu
Mas
s T
ran
spo
rt p
er S
amp
ling
Per
iod
(g
ha-1
)
Anaerobically Digested Biosolids - Colloidal Fraction Anaerobically Digested Biosolids - Dissolved FractionLime Stabilized Biosolids - Colloidal Fraction Lime Stabilized Biosolids - Dissolved Fraction
0
20
40
60
80
100
120
140
160
180
Aug. 10, 2
006
Sep. 8
, 2006
Oct. 6
, 200
6
Nov. 3, 2
006
Dec. 1
, 2006
Dec. 1
5, 2
006
Jan. 5
, 200
7
Jan. 1
9, 200
7
Feb. 9, 2
007
Mar.
2, 200
7
Mar.
23, 2
007
Apr. 13
, 200
7
May
11, 2
007
Jun. 8
, 200
7
Jul.
10, 2
007
Aug. 9, 2
007
Sep. 7
, 2007
Oct. 1
2, 2
007
Time (months)
Ni M
ass
Tra
nsp
ort
per
Sam
plin
g P
erio
d (
g h
a-1)
Anaerobically Digested Biosolids - Colloidal Fraction Anaerobically Digested Biosolids - Dissolved Fraction
Lime Stabilized Biosolids - Colloidal Fraction Lime Stabilized Biosolids - Dissolved Fraction
0
20
40
60
80
100
120
140
160
180
200
220
240
Aug. 10,
200
6
Sep. 8
, 200
6
Oct. 6
, 200
6
Nov. 3
, 200
6
Dec. 1
, 200
6
Dec. 1
5, 2
006
Jan. 5
, 200
7
Jan. 1
9, 2
007
Feb. 9
, 200
7
Mar
. 2, 2
007
Mar
. 23,
200
7
Apr. 13
, 200
7
May
11,
200
7
Jun. 8
, 200
7
Jul.
10, 2
007
Aug. 9, 2
007
Sep. 7
, 200
7
Oct. 1
2, 2
007
Time (months)
Ba
Mas
s T
ran
spo
rt p
er S
amp
ling
Per
iod
(g
ha-1
)
Anaerobically Digested Biosolids - Colloidal Fraction Anaerobically Digested Biosolids - Dissolved FractionLime Stabilized Biosolids - Colloidal Fraction Lime Stabilized Biosolids - Dissolved Fraction
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
Aug. 10,
200
6
Sep. 8
, 200
6
Oct. 6
, 200
6
Nov. 3
, 200
6
Dec. 1
, 200
6
Dec. 1
5, 2
006
Jan. 5
, 200
7
Jan. 1
9, 2
007
Feb. 9
, 200
7
Mar
. 2, 2
007
Mar
. 23,
200
7
Apr. 13
, 200
7
May
11,
200
7
Jun. 8
, 200
7
Jul.
10, 2
007
Aug. 9, 2
007
Sep. 7
, 200
7
Oct. 1
2, 2
007
Time (months)
Zn
Ma
ss
Tra
ns
po
rt p
er
Sa
mp
ling
Pe
rio
d (
g h
a-1
)
Anaerobically Digested Biosolids - Colloidal Fraction Anaerobically Digested Biosolids - Dissolved Fraction
Lime Stabilized Biosolids - Colloidal Fraction Lime Stabilized Biosolids - Dissolved Fraction
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Aug. 1
0, 2
006
Sep. 8
, 200
6
Oct. 6
, 200
6
Nov. 3
, 200
6
Dec. 1
, 200
6
Dec. 1
5, 2
006
Jan.
5, 2
007
Jan.
19,
200
7
Feb. 9
, 200
7
Mar
. 2, 2
007
Mar
. 23,
200
7
Apr. 1
3, 2
007
May
11,
200
7
Jun.
8, 2
007
Jul. 1
0, 2
007
Aug. 9
, 200
7
Sep. 7
, 200
7
Oct. 1
2, 2
007
Time (months)
Cd
Ma
ss
Tra
ns
po
rt p
er
Sa
mp
ling
Pe
rio
d (
g h
a-1
)
Anaerobically Digested Biosolids - Colloidal Fraction Anaerobically Digested Biosolids - Dissolved FractionLime Stabilized Biosolids - Colloidal Fraction Lime Stabilized Biosolids - Dissolved Fraction
0
200
400
600
800
1000
1200
1400
Ba Cu Ni Zn
Metals
Cum
ulat
ive
Met
al M
ass
Tran
spor
t (g
ha-1
)
Control - Colloidal Fraction Control - Dissolved FractionAnaerobically Digested Biosolids - Colloidal Fraction Anaerobically Digested Biosolids - Dissolved FractionLime Stabilized Biosolids - Colloidal Fraction Lime Stabilized Biosolids - Dissolved Fraction
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Ba -2006
Ba -2007
Cu -2006
Cu -2007
Pb -2006
Pb -2007
Zn -2006
Zn -2007
Metal
Rel
ativ
e am
ou
nts
Residual Organic Oxide Exchangeable
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Ba -2006
Ba -2007
Cu -2006
Cu -2007
Pb -2006
Pb -2007
Zn -2006
Zn -2007
Metal
Rel
ativ
e am
ou
nts
Residual Organic Oxide Exchangeable