Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 391 - DESIGN CRITERIA FOR SLUDGE APPLICATION ON LAND › Subpart E - SAMPLE COLLECTION AND ANALYSIS › Appendix E - Sample Calculations of Water Treatment Plant Lime Sludge Application Rates

Current through Register Vol. 48, No. 28, July 12, 2024
I. Laboratory analysis of sludge (dwb):
% Calcium Carbonate Equivalent
94.34
% Total Solids
24
pH
10.4
Arsenic
0.83 mg/kg
Barium
8.3 mg/kg
Cadmium
0.6 mg/kg
Chromium (hexavalent)
0.008 mg/kg
Chromium (total)
1.2 mg/kg
Copper
3.3 mg/kg
Mercury
0.0008 mg/kg
Nickel
8.75 mg/kg
Selenium
0.4 mg/kg
Silver
0.83 mg/kg
Zinc
6.6 mg/kg
Effective Neutralizing Value
(ENV) as calculated below
94.34
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total fineness efficiency assumed to be 100
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II. Compare ENV of water treatment plant lime sludge to ENV
				  of agricultural limestone.
Given: 1. ENV of typical agricultural limestone =
				  46.35
2. ENV of water plant lime sludge from (I.) above
				  = 94.34
Therefore:
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This means that 0.5 tons of water treatment plant
				  lime sludge is approximately equivalent to 1.0 tons of typical agricultural
				  lime.
III. Lime sludge will be applied to a light-colored silty
				  clay loam soil having a pH of 5.0.
IV. The soil will be used for grain farming.
V. The following list of soil types are to be used with the
				  corresponding letters shown on Charts I and II for the respective cropping
				  systems:
A) Dark-colored silty clays and silty clay
				  loams.
B) Light-and medium-colored silty clays and silty
				  clay loams; dark-colored silt and clay loams.
C) Light- and medium-colored silt and clay loams;
				  dark- and medium-colored loams; dark-colored sandy loams.
D) Light-colored loams; light- and medium-colored
				  sandy loams; sands.
E) Muck and peat.
Note: Color is related to organic matter.
				  Light-colored soils usually have less than 2.5 percent organic matter;
				  medium-colored soils have 2.5 to 4.5 percent organic matter; dark-colored soils
				  have above 4.5 percent organic matter; sands are excluded.
VI. With the above assumptions and referring to Chart I the
				  corresponding typical agricultural limestone application rate is 6 tons per
				  acre.
Since 0.5 tons of water treatment lime sludge is
				  approximately equivalent to 1.0 ton of typical agricultural lime (calculated in
				  II. above) apply only 3 dry tons of water treatment plant lime sludge per acre
				  of farm land.
Similar metal loading rates as calculated in
				  APPENDIX D should then be performed based on the 3 dry ton loading rate.
Note that due to the fineness efficiency of 100,
				  the water treatment plant lime sludge may only be effective in raising the soil
				  pH for one or two years after application. Suggested limestone rates based on
				  soil type, pH, and cropping system.
Suggested limestone rates based on soil type, pH,
				  and cropping system.
(Taken from Illinois Agronomy Handbook)
CHART I
GRAIN FARMING SYSTEMS
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CHART II
CROPPING SYSTEMS WITH
ALFALFA, CLOVER OR
LESPEDEZA
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