Conference Papers | 2006 Victorian Conference Papers

SUBSTITUTION OF FERRIC CHLORIDE WITH MAGNAFLOC 1597 IN AUTOTHERMAL THERMOPHYLLIC AERATED DIGESTION (ATAD) SLUDGE DE-WATERING PROCESSES
Ashley Elliott, Process Engineer, Campaspe Asset Management Services / Coliban Water

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ABSTRACT

This paper highlights the processes employed by Campaspe Asset Management Services (CAMS) in the identification and assessment of an alternate flocculant/coagulant for the de-watering of sludge post Autothermal Thermophyllic Aerated Digestion (ATAD) at the Bendigo Water Reclamation Plant (WRP).

Specifically, the paper outlines the rationale behind the replacement of the non-organic product ferric chloride with the organic product Magnafloc 1597. The alternate organic product Magnafloc 1597, traditionally used in the sugar refining industry was as yet un-trialled in Australia with ATAD sludges.

Ferric chloride, used for six years at the Bendigo site, created ongoing issues for operational staff with safe use and storage, effective conditioning of sludges pre-de-watering, cost and end product uses.

Both chemicals were trialled in over several months. The results of this trial allowed for the replacement of ferric chloride with Magnafloc 1597 as the sludge conditioning agent. Improvements were realised through a more efficient treatment of sludge, safer work environments and a more sustainable end product.

KEY WORDS

Centrifuge, De-watering, Ferric Chloride, Magnafloc, Autothermal Thermophyllic Aerated Digestion (ATAD)