Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-04-10
2000-05-23
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210620, 210631, 210912, C02F 162, C02F 1102
Patent
active
060662565
ABSTRACT:
A continuous process for the biological solubilization of heavy metals from primary or other metal-laden sewage that utilizes indigenous sulphur oxidizing bacteria and elemental sulphur as the energy source, prevents nitrite formation and minimizes the residual sulphur remaining in the processed biosolids. The process includes the steps of: enriching indigenous sulphur oxidizing bacteria in sewage sludge in an aerobic biological reactor at or above ambient temperatures; the feeding of sludge and elemental sulphur to this reactor to achieve a steady-state characterized by a pH<3 and an oxidation-reduction potential (ORP) of +400 to +600 mV; minimizing sulphur addition to achieve the desirable minimal residual sulphur in the processed biosolids; the removal of this processed sludge mixture; the separation of liquid and biosolids components of this processed sludge mixture; the neutralization of the biosolids component of the processed sludge followed by blending with undigested primary and/or secondary sludge or in isolation, prior to further processing and/or land application.
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Henry J. Glynn
Prasad Durga
Kinsman L. Anne
Wyse Thomas G.
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