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Ordering Information: Call Chief Operator John Lazelle at 802-464-3862

Composting Process

We use equipment purchased from Green Mountain Technologies in 1996, and have been using this in-vessel composting system since 1994. The first step in the process is to dewater the sludge which is accomplished by our new Ecomat Rotating Belt Filter which was installed as a part of our refurbishment project in 2016.

After the sludge is dewatered, we mix it with woodchips at about a 2 or 3 to 1 ratio of woodchips to sludge depending on the moisture content of the sludge and woodchips. After mixing the material is conveyed into the Comptainer.

Aeration tubes are connected and a built in computer is restarted to start the composting process. The computer reads data from temperature probes that are inserted into the sludge/woodchip mixture and regulates the temperature inside the Comptainer to insure that a uniform temperature is maintained throughout the Comptainer. To meet EPA regulations, the mixture must reach a temperature of 55 degrees Celsius (131 F), for three consecutive days. This is known as the “procedure to further reduce pathogens” (PFRP). The mixture must also maintain a temperature of 45 c or 113 f or 14 consecutive days to obtain proper (VAR) or “vector attraction reduction”. The mixture stays in the Comptainer for approx. 21 to 30 days, then is dumped using a roll-off truck and allowed to cure and the necessary laboratory analysis are completed. After curing and analysis are complete, the final product is given to Wilmington residents free of charge.  Delivery is free to Wilmington residents. The product is used mostly as a mulch for flower gardens or as a soil conditioner. It is a class A compost, but is not certified to be used in vegetable gardens.

Wilmington Compost Product Applications

The compost product produced by the Town of Wilmington can be used in a number of applications as a soil conditioner and organic fertilizer. The product is made by composting a mixture of municipal wastewater treatment plant biosolids and woodchips. The finished compost is an excellent source of organic matter that is uniform in color, texture and quality. Below you will find suggested methods of application and information regarding the characteristics of the compost.

Suggested Methods of Application

LAWN MAINTENANCE:

Top dress 1/3 inch of compost (approx. 1 cubic yard per 1000 square feet) on established lawn and rake. A mixture of compost and sand may also be used as a top dressing.

Topsoil Production of Lawn and Garden Establishment:

Mix up to one part compost with three parts soil by volume. Less compost is required with more fertile soils.

USE OF COMPOST ON HOME VEGETABLE GARDENS IS NOT RECOMMENDED!!

SHRUBBERY AND TREE PLANTING:

Uniformly mix compost with existing soil at a rate of one part compost to four parts soil by volume and use as backfill. Previously established shrubs may be top dressed with the compost as a maintenance fertilization.

COMPOST CHARACTERISTICS:

Wilmington Compost provides landowners, nursery operators, landscapers, greens keepers, general contractors, and others with an alternative to commercial fertilizers, and gives them an opportunity to recycle nutrients and organic matter into the environment. Plants benefit from the nutrients: nitrogen, phosphorus, and potassium within the compost. And its organic matter improves the soil structure and increases its water holding capacity.

DISCLAIMER:

There are no warranties, expressed or implied, that extend beyond the information in this brochure. The Town of Wilmington makes no warranty of merchantability or fitness of this compost for any other purpose than as described. Accordingly, and without limitation, there is no warranty, expressed or implied, as to quality or productivity of any compost, and the Town of Wilmington is not responsible for any alleged damage from the application of the compost. Composted sludge, like composted manure, is hygienically and environmentally safe when used properly. Compost, like any fertilizer or soil amendment, should be stored in a protected area away from children and animals, or where it may be washed into streams.

Metal VT Standards Average Soil Compost Cow Manure Dehydrated Poultry Manure Wilmington Compost Average 2016 Wilmington Compost Maximum 2016
2016
Arsenic mg/kg 15 n/a n/a n/a 0 0
Cadmium mg/kg 21 .15 1.0 1.90 0 0
Chromium mg/kg 1200 1.83 53 135 5.64 8
Copper mg/kg 1500 .53 42 485 116 162
Lead mg/kg 300 14.0 14 26 16 17
Mercury mg/kg 10 .87 n/a n/a .45 .61
Molybdenum mg/kg 75 n/a n/a n/a 0 0
Nickel mg/kg 420 2.20 200 20 5.63 5.63
Selenium mg/kg 100 n/a n/a n/a 1.58 1.58
Zinc mg/kg 2800 1.03 48 425 178 237
Fecal Coliform MPN/G 1000 n/a n/a n/a 83 230
Metal VT Standards Average Soil Compost Cow Manure Dehydrated Poultry Manure Wilmington Compost Average 2015 Wilmington Compost Maximum 2015
2015
Arsenic mg/kg 15 n/a n/a n/a 0 0
Cadmium mg/kg 21 .15 1.0 1.90 0 0
Chromium mg/kg 1200 1.83 53 135 4.73 6.69
Copper mg/kg 1500 .53 42 485 117 154
Lead mg/kg 300 14.0 14 26 18 20
Mercury mg/kg 10 .87 n/a n/a .27 .75
Molybdenum mg/kg 75 n/a n/a n/a 0 0
Nickel mg/kg 420 2.20 200 20 0 0
Selenium mg/kg 100 n/a n/a n/a 0 0
Zinc mg/kg 2800 1.03 48 425 164 201
Fecal Coliform MPN/G 1000 n/a n/a n/a 187 450
Metal VT Standards Average Soil Compost Cow Manure Dehydrated Poultry Manure Wilmington Compost Average 2014 Wilmington Compost Maximum 2014
2014
Arsenic mg/kg 15 n/a n/a n/a 1.98 3.60
Cadmium mg/kg 21 .15 1.0 1.90 1.20 2.10
Chromium mg/kg 1200 1.83 53 135 4.98 6.20
Copper mg/kg 1500 .53 42 485 135 170
Lead mg/kg 300 14.0 14 26 16.5 21
Mercury mg/kg 10 .87 n/a n/a .38 .45
Molybdenum mg/kg 75 n/a n/a n/a 12 21
Nickel mg/kg 420 2.20 200 20 4.45 5.30
Selenium mg/kg 100 n/a n/a n/a 3.93 7.10
Zinc mg/kg 2800 1.03 48 425 195 240
Fecal Coliform MPN/G 1000 n/a n/a n/a 227.83 380
Metal VT Standards Average Soil Compost Cow Manure Dehydrated Poultry Manure Wilmington Compost Average 2013 Wilmington Compost Maximum 2013
2013
Arsenic mg/kg 15 n/a n/a n/a 3.20 4.40
Cadmium mg/kg 21 .15 1.0 1.90 2.44 3.50
Chromium mg/kg 1200 1.83 53 135 6.06 8.70
Copper mg/kg 1500 .53 42 485 133 170
Lead mg/kg 300 14.0 14 26 24.60 35
Mercury mg/kg 10 .87 n/a n/a .34 .43
Molybdenum mg/kg 75 n/a n/a n/a 24.4 35
Nickel mg/kg 420 2.20 200 20 6.18 8.70
Selenium mg/kg 100 n/a n/a n/a 6.06 8.70
Zinc mg/kg 2800 1.03 48 425 206 260
Fecal Coliform MPN/G 1000 n/a n/a n/a 207.6 500

Glossary and other information regarding sewage sludge and biosolids:

“Sewage Sludge” refers to the solids separated during the treatment of municipal wastewater. The definition includes domestic septage. “Biosolids” refers to treated sewage sludge that meets the EPA pollutant and pathogen requirements for land application and surface disposal.

 

EPA Frequently Asked Questions about sewage sludge and biosolids

 

Water Environment Federation Q&A/Fact Sheet on sewage sludge and biosolids

 

State of Vermont Residuals Management Section that oversees the management of residuals, such as septage and wastewater sludge (aka biosolids).

 

For more information or to order a load of Compost, please fill out the form below!