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Levels of Manganese in Raw Water

Levels of Manganese in Raw Water

Levels of Manganese in Raw Water

(OP)
I've been asked to find out what the minimum level of Manganese in a Raw Water would lead to the installation of a Manganese Removal Process in a new Build Water Treatment Works.

As 25ug/l is the Utility's Design Target Mn level in final water (95%-ile), would it be fair to assume that a 95%-ile of 25ug/l Dissolved Mn in raw water would necessitate a Manganese removal process (as no dissolved Mn would be removed by a conventional treatment process) or double this  in the raw water of  Total Manganese i.e.50ug/l.

What in general is considered high Manganese level in a raw water source.

Cheers,

J

RE: Levels of Manganese in Raw Water

Manganese is generally removed for aesthetic reasons so there is not limitation for aesthetics. However, manganese at a concentration of 0.2 mg/l may cause encrustations of piping.

A work group in USEPA developed an RfD based on a Greek study of manganism due to drinking water exposure. A lowest oberved adverse effect level of 2 mg/l and a no observed adverse effect level of 0.17 mg/l were identified.

Reference: Water Quality and Treatment AWWA.

RE: Levels of Manganese in Raw Water

The SMCL for Mn is 0.05 mg/l.  My understanding is that a higher levels than that staining will occur.

Gary Schreiber, CWS VI
The Purolite Co.

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