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FW: Heavy metals in activated sludge
See comment by TVA researcher below.
Industrial Waste Reduction Engineer
Synterprise Group, Division of Tennessee Valley Authority
(423) 632-8489; (423) 632-3616 (fax)
TVA IWR HomePage www.tva.gov/orgs/iwr/iwrhome.htm
> Once metals are in sludge you can chemically stabilize them by lime
> treatment. However, the resulting product would be unsuitable for
> plant production without dilution because of the high pH. After
> dilution and soil incorporation, there would still be the possibility
> of the metals becoming available for plant uptake.
> The best solution is to keep the metals out of the sludge and failing
> that to base application rates on acceptable levels of metals (either
> with or without any chemical stabilization).
> Richard Strickland, TVA
> From: Joe Pringle[SMTP:email@example.com]
> Sent: Wednesday, March 11, 1998 3:01 PM
> To: LISTSERVER P2TECH
> Cc: Sangeetha
> Subject: Heavy metals in activated sludge
> Question from Exnora International in India:
> We have taken up composting of vegetable wastes from the Koyambe-
> du market in Madras, Asias's largest vegetable market. The
> Chennai Metro Water Supply and Sewerage Board has agreed to
> compost the waste by using the activated sludge from the sewage
> treatment plant in Koyambedu. But one important issue would be
> `How do you remove heavy metals in the sludge?' We have been
> writing to several people enquiring about this. Any ideas?
> please CC any responses to Exnora International at:
> or firstname.lastname@example.org