Two main types of human wastewater are:

Two main types of human wastewater are:

• A. Industrial effluent and agricultural runoff.
• B. Rainwater and groundwater.
• C. Human sewage and greywater.
• D. Pesticide residues and heavy metals.

Answer: (C)

Wastewater from humans in domestic settings falls into two main categories: sewage and greywater. Sewage carries waste from toilets, including feces and urine, and is highly polluted with organic matter and pathogens, requiring robust treatment. Greywater comes from sinks, baths, showers, and laundry; it contains fewer pathogens and less solid waste but still has detergents, oils, and some nutrients, and can be treated differently depending on the system. The other options describe wastewater from non-human sources (industrial effluent, agricultural runoff) or non-wastewater sources (rainwater, groundwater) or contaminants, not the typical domestic wastewater types.

Wastewater from humans in domestic settings falls into two main categories: sewage and greywater. Sewage carries waste from toilets, including feces and urine, and is highly polluted with organic matter and pathogens, requiring robust treatment. Greywater comes from sinks, baths, showers, and laundry; it contains fewer pathogens and less solid waste but still has detergents, oils, and some nutrients, and can be treated differently depending on the system. The other options describe wastewater from non-human sources (industrial effluent, agricultural runoff) or non-wastewater sources (rainwater, groundwater) or contaminants, not the typical domestic wastewater types.