Final answer:
The typical removal efficiency of settable solids in a primary clarifier in wastewater treatment is around 50-60%. This may vary based on the facilities' operation and system capabilities.
Step-by-step explanation:
The typical removal efficiency of settable solids in a primary clarifier is an important aspect of wastewater treatment. In the sedimentation tank, or primary clarifier, settable solids are allowed to settle as sludge, while lighter materials such as grease that floats to the top. The sludge is then pumped out for further processing. Based on industry standards, primary clarifiers can typically remove 50-60% of the settable solids entering the treatment facility.
However, more advanced systems or well-operated facilities may reach even higher efficiencies. The sludge that is removed can be further processed through sludge digestion, reducing volume, odors, and pathogens, and sometimes repurposed as fertilizer after safe contamination testing. The typical removal efficiency of settable solids in a primary clarifier can vary depending on the conditions, but it is generally around 40-50%. Settable solids are heavier particles that settle to the bottom of the clarifier, forming sludge. The sludge is then pumped out and sent to a solids processing facility.