ABC Wastewater Treatment Class IV case studies
ABC Wastewater Treatment Class IV · Put your knowledge to work in context.
The ABC Wastewater Treatment Class IV credential is the advanced tier of a professional certification series for wastewater treatment operators. It is intended for experienced personnel who already run conventional treatment plants and are moving into lead, chief operator, or supervisory roles where they direct process decisions, troubleshoot upsets, and oversee shift-level work. The ABC Wastewater Treatment Class IV case studies are 5 cases and about 4,373 words.
1Rising Sludge Blanket: Denitrification or Filamentous Bulking?
Your 2.4 MGD conventional activated sludge plant has four aeration tanks and four secondary clarifiers. Design SRT is 8 days; MLSS runs 2,800 mg/L and final-pass DO is 1.8 mg/L.
935 words, about 5 min2Alkalinity-Limited Nitrification With Alum Phosphorus Removal
Your 1.8 MGD plant must meet effluent TP 0.5 mg/L and NH3-N 1.0 mg/L monthly, with pH between 6.0 and 9.0. Influent alkalinity averages 185 mg/L as CaCO3, influent NH3-N is 32 mg/L, and influent TP is 6.5 mg/L.
852 words, about 4 min3Belt Press Performance: Feed Condition or Equipment Capacity?
Your 0.9 MGD activated sludge plant runs 3,200 mg/L MLSS in 1.2 MG of aeration volume and wastes 32,000 gpd of WAS at 7,500 mg/L. The WAS goes to a 40,000-gal holding tank pumped out once per day to a 1.7 m belt filter press running about 8 hours; design solids loading is 500 lb/(h·m).
844 words, about 4 min4Lift Station: Low Pump Capacity and Impossible Cycle Counts
A 3,200-home subdivision drains to a duplex lift station with two identical 700 gpm constant-speed pumps and a 12-ft-diameter wet well (plan area 113 sq ft). Floats start the lead pump at 8.0 ft and stop it at 4.0 ft.
872 words, about 4 min5Weekend Sewer Overflow: Reporting, the Unreported Spill, and Root Cause
At 06:40 on a Saturday, a collection crew responding to a call finds an 8-in gravity sewer running full and overflowing from a manhole into a storm ditch. Grease and roots are visible.
870 words, about 4 min