Environment, health and safety

What is the main reason waste liquids from semiconductor fabs are collected separately as acids, alkalis, fluorides, organic solvents and so on?

  1. ATo reduce the weight of waste liquids
  2. BTo make waste liquids uniform in color
  3. CTo apply treatment or reuse suited to each type, and to prevent dangerous reactions from mixing
Show answer and explanation

Answer: C. To apply treatment or reuse suited to each type, and to prevent dangerous reactions from mixing

Suitable treatment differs by type of waste liquid: fluoride-containing liquid is precipitated by adding calcium, while organic solvents are incinerated or recovered. Segregation makes treatment and recycling easier and prevents dangers such as heat generation and toxic gas release from mixing.

Practice this topic Back to topic

More Environment, health and safety questions

  1. Which occupational hazard requires particular attention where large amounts of nitrogen gas are used?
  2. In calculating a company's greenhouse gas emissions, which category covers direct emissions such as fuel combustion and process gas emissions at its own fabs?
  3. Which is the correct basic action when a toxic gas leak alarm sounds?
  4. For work using chemicals, what is the activity called that identifies hazards, estimates the magnitude of risk and decides countermeasures?
  5. In work handling organic solvents, what is the main purpose of grounding containers and piping?