When the Numbers Don’t Add Up

An investigation of bulking sludge reveals the presence of filamentous bacteria and suggests a solution based on improving maintenance and operating practices.
When the Numbers Don’t Add Up
Dissolved oxygen readings are shown on a Hach LDO meter and a YSI 556 multimeter.

The plant operator was at his wits' end. The sludge just wouldn't settle, no matter how he tried to control it. Solids wash-out was a regular event, causing the effluent to be out of compliance with state TSS, BOD and fecal coliform regulations.

To keep the solids from...

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