I would like to make a review on this type of materials and I wonder if there's been a resarch work conducted in this area.
Interesting question. True, the Zn could produce toxicity at high concentrations, but be careful that Zn is an essential element plant growth. Therefore, the presence of this element does not always mean toxicity or contamination!
In my institute we have had some research on this. In Denmark the sludge is mainly derived from the natural content of iron and other metal ions in the groundwater. There is rarely any use of coagulants, so aluminium is low in our sludges.
We also researched the use of this type of waste for wastewater treatment and in the publication on this you can find some consideration on the heavy metals present in the sludge.
Article Amendment of arsenic and chromium polluted soil from wood pr...
Article Application of waterworks sludge in wastewater treatment plants
Article Transformation of natural ferrihydrite aged in situ in As, C...
I'd like to share another perspective - recovery of phosphorus and decontamination of water treatment residuals containing heavy metals and arsenic, when the residuals are incinerated and ash is produced.
Another thing is application of electrodialytic method for soil decontamination to remove heavy metals and arsenic.
Article Electrodialytic Separation of Phosphorus and Heavy Metals fr...
Article Comparison of two different electrodialytic cells for separa...
There is a new publication on this subject.
Article Full scale amendment of a contaminated wood impregnation sit...
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