Windrow composting is a way of generating compost by piling organic matter into extended rows or elongated pyramid-like piles. The piles are turned over by large machinery to preserve even levels of heat, humidity, and oxygen content. Piles will usually range from four to eight feet tall and 14-16 feet in length.
In windrow composting, ground-up garden refuse is formed into long, open-air piles. The piles are turned frequently to introduce oxygen into the pile, and ensure that adequate moisture is present throughout the pile.
Normally windrow systems take about 6 to 12 weeks to make finished compost. The pile is agitated at regular intervals of 1 to 3 times per week to introduce oxygen and water to enhance the composting process.
It is estimated that the unenclosed facilities (unenclosed ASP and windrow composting) will have a unit costs ranging from $38 to $435 per wet ton of biosolids processed. For enclosed composting (enclosed ASP or in-vessel) the cost would be in the range of $55 to $65 per wet ton.
Special vehicles are required to agitate the windrows periodically by turning them upside down, which introduces oxygen and facilitates aerobic decomposition in the windrow.
Odors and other emissions are likely to be a major consideration when evaluating potential environmental impacts of a composting operation, especially an open air windrow. Open-air composting alternatives (unenclosed ASP and windrow composting) have a larger element of risk.
A first of our waste incineration plant facts is that a “burner” (this being the derogatory term of the anti-incinerator capaigners) is an important facility for the preservation of public health as it involves protecting the environment in a number of ways. Unless the waste materials are properly disposed of by the waste incinerator plant, […]
We were recently asked; “What is Commercial Composting” and since one person asked we wrote a definition, as follows below: Commercial composting is the composting carried out principally as a method of waste disposal that diverts this organic waste away from landfills. If the feedstock is green waste or another “MSW residual waste” organic material […]
Progressive cities and many urban centers around the world are now installing large-scale in-vessel composting systems as part of their total MSW management. Large scale in-vessel composting, which makes high quality compost through the use of enclosed “reactors” that closely monitor temperature and oxygen levels throughout the biodegradation of organic materials, is popular. In-vessel composting […]
Autoclaving is defined as a form of Mechanical Heat Treatment (MHT) which takes place as a batch process and comprises steam processing of residual MSW, in a vessel under the action of pressure. This is contrasted with other MHT waste treatment technologies which are continuous and don’t involve pressurization. Autoclave and Steam Plant – Estech […]