Monday, 14 March 2011

Tour of Oswestry Garden Waste Composting Site

As keen home composters you may not even be aware that the Council runs a garden waste collection scheme.  Personally even though I try to compost virtually everything I possibly can at home, I do find it handy on the odd occassion for some of the tougher woodier stuff and for huge cardboard boxes and things like conifer which just doesn't home compost so easily.

So out of interest some volunteers from Shropshire Master Composters went to have a look around the farm near Oswestry where some of the garden waste collected by the Council ends up.  This is run by a very nice chap; farmer Jones.  He kindly gave us a personal guided tour and explained how it all works...

First we create the waste, by mowing the lawn and doing some gardening and put the contents into our wheelie bins for the Council to collect. 


All the garden waste then gets taken to the farm and weighed on the vehicle weigh-bridge. 


The vehicle then drives round to the tipping area where the entire back of the truck lifts up and allows all the garden waste to be tipped into a big pile.


This material then gets shredded down in a massive industrial shredder to create a less coarse mixture which gets put into big pyramid shaped piles called 'Wind Rows'.

These windrows get turned regularly using a tractor to aerate them and they start to rot down and get very hot in the process.  As the picture below shows the temperature probe in the middle of heap is over 60 degrees! That probably about twice as hot as your home compost bin will get to, and thats why its such an efficient and rapid process.


After a couple of months the waste is looking much more like what you would expect compost to look like; brown and earthy.  At this point he moves the compost indoors for its final maturation period. 


Once its cooled down and stablised, it can be spread onto the farmers fields.  The resulting product is an excellent soil improver which not only looks the part but is certified to the PAS100 national composting standard. 


In fact its so good that the whole farm is now using compost only and does not need to rely on artificial fertilisers any more.


7 comments:

  1. Be very careful about putting this on your garden it has a PH of around nine. I used four tonnes on my garden and it destroyed everything it touched. I am desperately trying to reduce the ph of my Veg plots down to below 8 and finding it very difficult. In addition the 'soil conditioner' sucked every ounce of nitrogen from my soil so I have to use high nitrogen grass fertilizer to get anything to grow.
    Soil texture is howeever perfect

    ReplyDelete
  2. Be very careful about putting this on your garden it has a PH of around nine. I used four tonnes on my garden and it destroyed everything it touched. I am desperately trying to reduce the ph of my Veg plots down to below 8 and finding it very difficult. In addition the 'soil conditioner' sucked every ounce of nitrogen from my soil so I have to use high nitrogen grass fertilizer to get anything to grow.
    Soil texture is howeever perfect

    ReplyDelete
  3. Dawn whitley.
    We have used this product for nearly ten years and have never had a problem with it. We have introduced it to many of our clients who had sub standard soil. Used in the correct way it is fantastic. We never lay it more than two inches thick at any one time. It is then dug into the borders, veg beds etc when they are weeded or planted. This is a Soil Improver not a soil substitute and should be treated as such, to help improve texture and workability. Granules fertilisers, liquid fertilisers are used when necessary as in any garden if you want the best from plants. If filling a raised border or veg bed a mix of soil, sand and soil improver should be used.

    ReplyDelete
  4. Dawn whitley.
    We have used this product for nearly ten years and have never had a problem with it. We have introduced it to many of our clients who had sub standard soil. Used in the correct way it is fantastic. We never lay it more than two inches thick at any one time. It is then dug into the borders, veg beds etc when they are weeded or planted. This is a Soil Improver not a soil substitute and should be treated as such, to help improve texture and workability. Granules fertilisers, liquid fertilisers are used when necessary as in any garden if you want the best from plants. If filling a raised border or veg bed a mix of soil, sand and soil improver should be used.

    ReplyDelete
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