How to treat and dispose sludge produced from chemical precipitation of heavy metals from wastewater
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To remove heavy metals from industrial waste water, chemical precipitation is used. The sludge generated in primary clarifier needs to be treated an disposed of. Is the treatment train will be to use filter press and dry the sludge on sludge drying beds or is there any other process to treat this kind of sludge
You may want to consider current microbiological solutions. Metals as we all know are essential to establish and maintain all immune systems in both plant and animals. But when these are made into compounds with loose ions they become toxic. The simplest and least costly is to add RNA microbial species to the matrix so the loose ions are consumed. Sludge is gone, toxins are gone. Potable drinking water at your pleasure.
The removal rate of Zn in sludge can reach 99% with Cr of 65%, Cu of 74%, Pb of 58% and Ni of 84%.Some scholars have tried to use other strains in biofiltration. Mulligan et al. isolated aspergillus Niger from tailings, with the maximum dissolution rate Cu of 68%, Zn of 46% and Ni of 34%.Biological filter tube method depends on the efficiency of the removal of heavy metals in the sludge microbial activity and the types and forms of heavy metals, so the actual application of this method, not only to control the temperature, pH, Eh value, biological species and concentration of sludge should also be considered the kinds, concentration and kinds of heavy metals, the influence of such factors as to obtain significant treatment effect, many factors must be taken into account comprehensively and strictly control the process conditions.