How to do 1.3?

1.3 Hazardous wastes containing polycyclic aromatic hydrocarbons (PAHs) require proper treatment prior to disposal. PAHs have been reported with a wide range of toxic properties, including impact on the human immune system after long- term exposure. (a) State ONE toxicity classification of PAHs. (1 mark) (b) Explain THREE limitations of biological methods for the treatment of hazardous wastes containing aromatic compounds. (6 marks) Explain ONE physical method to remove PAHs from industrial wastewater. (3 marks) (c)