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Tiede’s 4 Recipes for Wastewater Success

You will be sad to hear that we have come to our final installment of the four part monthly wastewater treatment series but don’t fret just yet. We will still feature Wastewater Treatment articles in ChemNotes on a regular basis.

If you missed any of the previous articles you will find them in the links below:

Part 4: Ch-ch-changes that will effect your WWT:

You can contact Robin Tiede, Aquapure Product Manager, at rtiede&

You can contact Robin Tiede, Aquapure Product Manager, at

  • A change in upstream chemistry –

Changes of the chemicals on the plating line or adding different cleaners may bring about changes in wastewater treatment. Addition of chelators may cause pin floc or tie up metals that may require a metal precipitant where one was not needed before.

  • Changes in production output affecting wastewater flow rate –

An increase in production may lead to a higher flow rate in the rinses that will send more water to wastewater treatment. If you have proportional pumps that change with flow rates your dosing will respond by increasing the dose to the tanks. If you don’t have proportional pumps then the dosing may have to be adjusted manually for increased flow days OR you may experience an upset that will require jar testing to determine how much higher the dosing needs to be. On low flow days you may need to cut back on the chemistry.

  • A change in contaminants –

Contaminants like soils, fats, oils and grease, dissolved metals, COD, BOD, and TSS can occur without you even knowing. It is very important to keep organized and periodic notes on visual changes in your WWT system as well as water analysis.

  •  Change in new incoming jobs –

New jobs can bring in pre-coated parts such as oils or lacquers that may not be cleaned off in the cleaning line. Another example is metallic zinc coated parts that may be stripped in the pickle in production. In this case the zinc will be dissolved and have to be precipitated out in WWT. The solubility of new metal contaminants may be slightly different than what you are presently treating, you may have to adjust the pH up or down in the final effluent.

Remember: Observation, Communication And Documentation Are KEY TO WASTEWATER SUCESS