1 land application of wastewater sludge susan a. murphy – kansas city, mo jeff waszgis – crete,...
TRANSCRIPT
11
Land Application of Wastewater Sludge
Susan A. Murphy – Kansas City, MOJeff Waszgis – Crete, NEAlan Ygsi – Denison, IA
66
The city of Lincoln, NE, produces methane gas from sludges, generating electricity.
Our DAF sludge is used to generate methane, and nutritive biosolids are sold to farmers. Lincoln generated approximately 14 dry tons in 2010.
Photo from U of Nebraska-IANR
77
How Much Sludge do YOU Generate?
• Soil nutrients are valued on a Dry Basis
Example: 8% solids, 4 million gallons
How much water is included?• The water in the sludge must not puddle in the
field• Anaerobic Lagoons-Each year the decision is
made: Pond Cleanout vs. Sludge Dredging?• Does your sludge have what it takes?
88
State Permitting Requirements
Municipal Sewage Sludge is not the same as industrial pretreatment sludge. Permit requirements are different!
There are restriction of pathogens from land application sludges on crops for direct human consumption (strawberries, lettuce…) or on public access land (parks,….).
99
Permit Exempt does not mean Exempt from State Requirements!
Iowa DNR Example: Permit Exempt as long as--The maximum application rate is not to
exceed 2 tons per acre per year (dry basis)Less than 2 ton/ac if soil tests indicate field
nutrient levels are significantly in excess of crop nutrient requirements, or would provide heavy metals concentrations in the soil at detrimental levels (crop or human health hazard)
Exempt application has requirements, too!
1010
State Permitting Requirements• Identify the fields we may be able to utilize, • and get the landowner contact information• Calculate the amount of nutrients each
specific field and crop can uptake in the growing season
• Immediate incorporation into the soil• Stay a minimum distance from waterways, no
standing water• Identify the fields and application rate of each
field, and the landowner contact information• Prepare a Land Application Plan, and keep
organized before/after records
1111
Land Application ManagementFields are too wet
Land compacts, ruts, sludge can run off field, causing contamination
Fields are frozen, hard to inject sludge Crop yields were not very good the previous year
Landowner changes Contractor Availability
Slow return on laboratory resultsPermitting
TIMING BECOMES EVERYTHING
1212
The Costs
- Lagoon Sludge Sampling, Analyses Fees- Farm Field Analysis- Dredging/Pumping- Transporting- Field Spreading or Injection of Sludge- Reincorporation and Repair of
Compaction Areas- Permitting
1313
The Benefits
- Reduction of waste and beneficial use of wastewater treatment byproduct
- Conservation of landfill space- Soil amendment reduces local farming
costs (Nitrogen, Phosphorous, Potassium, Copper, Zinc, Iron, Sulfur)
- Fertilizer Production natural resource savings (energy, water, etc.)
- Reflects our company’s waste reduction efforts within the community
1414
How do we do this?
Reference State RegulationsPrepare Soil Application PlanDetermine Local InterestSample and Analyze SludgeObtain Field Analyses (Local Ag Office)Calculate application rate based on field analysis,
crop requirement Notify the State Watch the WeatherApply with CareMonitor the Site Keep Documentation OrganizedStart Early before each sludge application season
2020
Take Home
Sludge Management is Costly!The fewer solids that go to
wastewater, the less sludge we generate
Where do your DAF andClarifier solids belong?