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Ask-Guru-thread-53


Keywords :- Soil amelioration for slag waste sites

Enquirer, Request, 1st response, 2nd response,

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From: -Daniel Stocks
Date: 17th May 1999
Organisation: Brackenhurst college, Nottinghamshire
Subject: Soil amelioration for slag waste sites

 

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Dear Micky,

 

1st response

 

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Dear Daniel

It appears that you will be dealing with an environment that has potential for contamination by :-

  • Ammonia, Phenol, Coal Tar (coal shale waste)
  • Chlorine, Sodium, Heavy metals (pulverised fuel ash)
  • Calcium hydroxide calcium silicate (builders rubble, concrete)

To get a feel for the degree of contamination associated with these substances, have a look at the following:-

  1. The ICRCL tables - which deal with phytotoxicity etc.
  2. The Kelly Indices - which focus on old gas-works.

    I suggest that you also have a look at the various pages on the site that deal with phytoremediation - you might get some clues as to what grows best.

  3. BIORENEW Phytoremediation project
  4. Phytoremediation
  5. Phytoremediation - MSc project
  6. Phytoremediation project - collaborators/funds sought
  7. Phytoremediation - information needed
  8. Biodegradation of explosives by transgenic plants

    And finally have a look at the various

  9. DoE guidelines
One last thought, the Landscape Show at Olympia, London (15th - 17th June) has as one of it's exhibitors a company called Voelcker Science Ltd. They are an environmental consultancy who offer as one of their specialities, landscaping and site remediation.

cheers

Micky

 

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Dear Daniel

I went to the Landscape show yesterday, and got quite a bit of useful information from the Voelker stand. They have just set up a soil exchange, which is designed specifically for the landscape sector, and will offer the following services:-

  1. Soils available (by soil type, quantity and source)
  2. Soils wanted (users can specify soil type required)
  3. Soil suppliers (for suppliers who have constant soil stocks available)

Although they will not be vetting each entry to the data-base, they will encourage suppliers to provide soil analysis data along the lines of this set of parameters, in order to promote good practice in the industry.

For further details contact Dr Andrew Butler at Voelcker Science Ltd - which incidentaly is packed with all sorts of useful information.

Oh I nearly forgot they were handing out handy plastic memory jogger cards with extracts from 'A Guide to Specifying Topsoil' Parts 1 + 2 by R.M. Voelker et al (Landscape Design March + April 1989), which gave parameters for soil attributes needed to sustain healthy plant growth :-

  1. Major Nutrients etc
      pH			     5.5 - 7.8
      Electrical Conductivity	     < 1500 uS/cm
      1:2.5 (w/v) Extract
      Organic Matter		     > 4.0%  (w/w) [1]
      Nitrogen (N)		     > 0.2%  (w/w) [2]
      Extractable Phosphorous	(P)  >  45 (mg/kg) [3]
      Extractable Potassium (K)    > 240 (mg/kg) [3]
      Extractable Magnesium (Mg)   >  80 (mg/kg) [3]
      
      	[1] BS 1377
      	[2] Kjeldahl
      	[3] MAFF Handbook RB 427
      

  2. Phytotoxic Elements (not normally hazardous to health), based on values in ICRCL 59/83 where a pH value of 6.5 is assumed. If the pH value falls, the toxic effects and takeup of elements below will increase.
      Total Copper (Cu)	     < 130 (mg/kg)
      Total Nickel (Ni)	     <  70 (mg/kg)
      Total Zinc (Zn)		     < 300 (mg/kg)
      Water-soluble Boron (b)      <   3 (mg/kg)
      

  3. Zootoxic Elements (which may pose hazards to health), based on trigger concentrations given in ICRCL 59/83 (open spaces etc)
      Total Arsenic (As)	     <  40 (mg/kg)
      Total Cadmium (Cd)	     <  15 (mg/kg)
      Total Chromium (Cr)	     <1000 (mg/kg)
      Total Lead (Pb)		     <2000 (mg/kg)
      Total Mercury (Hg)	     <  20 (mg/kg)
      

  4. Stones
      Maximum size		    50mm
      Maximum Content (2-50mm)    35% by dry weight
      				(the 2-5mm part
      				is <20% dry wt)
      

  5. Soil Texture
      Sand (0.05-2mm)		     Max 75%, Min 20%
      Sand (0.002-0.05mm)	     Max 60%, Min  5%
      Sand (<0.002mm)		     Max 30%, Min  5%
      
Cheers

Micky


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