Massachusetts Wastewater Practice Exam

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A waste stream with high __________ would indicate metal finishing and plating wastes.

Dissolved solids.
BOD.
Suspended solids.
Toxicity.

The correct answer is: Dissolved solids.

A waste stream with high dissolved solids would indicate metal finishing and plating wastes because these processes often involve the use of various metals and chemical compounds that are dissolved in the treatment solutions. During metal plating and finishing, metals such as chromium, nickel, and copper are used, leading to a significant increase in the concentration of dissolved solids in the wastewater. Additionally, the chemicals used to process the metals can contribute further to the dissolved solids content. In this context, it’s important to recognize that while high levels of BOD (biochemical oxygen demand) might indicate organic pollution, and high suspended solids could suggest sediment or particulate matter, those are less specific indicators of the activities associated with metal finishing and plating. Toxicity can also be a concern in these waste streams, but it's not as direct an indicator as the presence of dissolved metals.