Which of the following is equivalent to the given expression? 
Definitions:
Sewage Treatment
The process of removing contaminants from wastewater, primarily from household sewage, to produce an effluent that is suitable for discharge or reuse.
Suspended Solids
Particles that are not dissolved in liquid, floating or suspended in water or another liquid.
Physical Process
Natural phenomena or mechanisms that involve the physics of matter and can affect the environment and ecosystem.
Oxygen-demanding Wastes
Organic wastes that reduce the amount of dissolved oxygen in water, often resulting from industrial or agricultural processes.
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