Question

Secondary sewage treatment is mainly a
A. Biological process
B. Physical process
C. Mechanical process
D. Chemical process

Answer 1

Hint: Sewage treatment is the method of eliminating contaminants from local wastewater, including mainly household sewerage plus some industrial wastewater. Chemical, Physical, and biological processes are utilized to eliminate contaminants and create treated wastewater (or manipulated effluent) that is adequate for discharge into the environment.

Complete Answer:
Let us find the correct answer,
Option A: Sewage pollution can be stopped by managing sewage before moving into a watercourse in a sewage or effluent processing plant.
The sewage method requires -
1. Primary treatment includes churning, floatation, shredding, screening and sedimentation.
2. In Secondary treatment the primary matter is decayed by microbes and through residue fungus by moving through a water hyacinth lake, running filter method or activated residue system. Aeration benefits in the oxidation of sludge.
3. Tertiary treatment is a Physico-chemical method for raising turbidity and suspended materials.
Therefore this is the correct option.

Option B: Processes like sedimentation screening and skimming are utilized to separate the masses. No chemicals are included in this process. One of the main applications of physical wastewater treatment. Therefore this is an incorrect option.

Option C: Mechanical processing technologies use a set of tanks, along with blowers, pumps, covers, grinders, and other mechanical elements, to treat wastewaters. Therefore this is an incorrect option.

Option D: Chemical wastewater treatment methods involve chemical precipitation (consolidation, flocculation), ion neutralization, replacement, adsorption, and disinfection. Therefore, this is an incorrect option.

Thus, option A) Biological process is the correct answer.

Note: Biological wastewater treatment uses bacteria and other microbes to purify water. Wastewater typically includes a table of organic material, such as waste, tastes, and partially absorbed foods. It also may include pathogenic bions, heavy metals, and toxins.