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Porous pots were used to mimic, on a laboratory scale, an industrial activated sludge plant from a thermomechanical pulp and newsprint paper mill. Trace metal additions of Ca, Co, Cu, Fe(III), and Mg were found to improve chemical oxygen demand removal from 82% to 86 to 87%. Copper (0.1 to 1.0 mg/L) was also found to be beneficial in significantly inhibiting the growth of filamentous bacteria, contributing to a reduction of 20 to 45% in sludge volume index (SVI) with improved settleability and decreased bulking. However, at levels of 1.0 mg/L and higher, the concentration of Cu in the porous pot effluent would potentially exceed guidelines for receiving waters. The fate and impact of Cu was affected by the presence of other trace metals, in particular Mg and Ca. The addition of Mg or Ca along with 0.5 mg/L Cu increased the amount of Cu in the aqueous phase to levels that would potentially exceed government environmental guidelines. Calcium addition was also found to inhibit the effect of Cu in reducing filamentous bacteria and SVI.

Item Type:	Refereed Article
Keywords:	pulp and paper mill wastewater, trace metals, activated sludge, porous pots, cation addition
Research Division:	Chemical Sciences
Research Group:	Other Chemical Sciences
Research Field:	Industrial Chemistry
Objective Division:	Manufacturing
Objective Group:	Wood, Wood Products and Paper
Objective Field:	Pulp and Paper
UTAS Author:	Barnett, JN (Mr Jason Barnett)
UTAS Author:	Stack, K (Dr Karen Stack)
UTAS Author:	Lewis, T (Dr Trevor Lewis)
ID Code:	106729
Year Published:	2015
Web of Science® Times Cited:	1
Deposited By:	Chemistry
Deposited On:	2016-02-18
Last Modified:	2017-10-25
Downloads:	3 View Download Statistics