Question

Which of the following steps are taken in the first stage of integrated wastewater treatment?

• A. Chlorine treatment
• B. Filtering
• C. Sedimentation
• D. All of the above

Answer 1

The correct option is D All of the above

Sedimentation
Sedimentation is the process of settling down of suspended particles present in water using gravity.

Filtering
In filtration, water flows through a filter which is designed to remove particles from within it.

Chlorine treatment
In chlorination, chlorine gas is injected into the water to kill all the microbes present in it.

Integrated wastewater management
An integrated wastewater management system was developed by the townspeople of Arcata in collaboration with biologists from the Humboldt State University.
It is a two-stage cleaning process, the steps are-
1. Primary sewage treatment which includes sedimentation, filtration and chlorine treatment.
2. After the primary treatment, the sewage was allowed to flow through a series of six connected marshes which were developed by the biologists.
Thus, the first stage of integrated wastewater treatment includes sedimentation, filtration, and chlorine treatment.

Final answer
(D) All of the above