Wastewater operator continuing education

Digester Souring: The Four Numbers and the Cure

Counts in Alabama (no pre-approval required)

Digesters can sour without obvious signs, leading to inefficient gas production and costly downtime. This hour shows how to spot the four key souring indicators, figure out what's causing the problem, and choose the right treatment to get your digester back on track.

Course summary, as it appears on your certificate

To equip wastewater operators with a clear understanding of the four critical digester souring indicators, the implications of their readings, and practical strategies for diagnosing and curing digester souring conditions, improving operational decision-making and system reliability.

Level 1 — what it is and why — the foundations, for operators new to the subject or wanting a refresher

Credit awarded: 1 hour — Technical

The Alabama course number is issued by the Agency for this course and is printed on your certificate.

Reviewed by: Robert Risley, Class 1 Wastewater Operator — reviewed October 2026

AquaCert does not mark its own homework: a licensed operator reviews the content and the course cannot be sold while that review is out of date.

One hour of study is one hour of credit. Your certificate reports the hours, which is what Alabama records against your renewal.

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What's included

• ✓ Self-paced online coursework you can start, pause, and resume anytime
• ✓ Short questions along the way, and a short final quiz to pass for your certificate (retake it as often as you need)
• ✓ An official certificate of completion (PDF) with a public verification code
• ✓ Progress saved to your My Learning dashboard