Read the following passage and answer the questions given.
The production and improper disposal of waste are causes for a great deal of environmental pollution. Many toxic industrial wastes from manufacturing process require treatment and /or safe disposal.
When materials are recycled, apart from saving on the coast of raw material, waste disposal coast are reduced.
Some combustible materials like dried leaves etc can be burnt to get heat energy. Sewage treatment includes filtering, scudge settlement, degradation coagulation disinfection using chlorine etc.
Certain microorganisms can degrade waste in the absence of oxygen-digestion.
Which of the following statements about sewage treatment is false?

Options

A. In primary treatment large sized particles are filtered and residual water is subjected to sedimentation
B. Secondary treatment involves aerobic digestion of organic waste
C. In tertiary treatment the waste water is treated with lime to remove phosphate
D. Coagulation can be carried out by passing ozone through waste water