Gray Water consists of (A) Kitchen waste water (B) Waste water containing…

Concept

Greywater is domestic wastewater produced by household activities other than toilet discharge.

It generally covers water from bathing and washing and, in the broad classification used here, kitchen wastewater; fecal sewage is blackwater, while industrial effluent and agricultural runoff belong to separate source categories.

Application

Classify each listed stream by its source and whether it contains toilet sewage.

• (A) Kitchen wastewater is a household stream included as greywater in this question’s classification.

• (B) Wastewater containing fecal matter is blackwater because it includes toilet sewage.

• (C) Wastewater from industrial units is industrial effluent, not domestic household wastewater.

• (D) Bathroom wastewater is a household bathing and washing stream classified as greywater.

• (E) Agricultural runoff is water flowing from fields, not household wastewater.

Therefore, the listed greywater sources are kitchen wastewater and bathroom wastewater, that is, (A) and (D) only.

Contrast

• The set (A), (B), (C), (E) mixes a household stream with fecal sewage, industrial effluent, and agricultural runoff.

• The set (A), (C), (D), (E) combines household greywater streams with industrial effluent and agricultural runoff.

• The set (C), (E) contains only industrial effluent and agricultural runoff.

• The set (A), (D) contains the two household streams identified in the classification.

Cross-check

As a cross-check, neither selected stream explicitly contains toilet discharge, and both arise from household washing or cleaning activities.

Result

Hence, (A) and (D) only.