Words to Describe desulfurization

How desulfurization often is described ("________ desulfurization")

• regenerative
• situ
• catalytic
• flue
• high
• partial
• hot
• simultaneous
• adequate
• temperature
• bacterial
• deep
• microbiological
• mild
• oxidative
• conventional
• maximum
• crude
• biological
• further
• direct
• dry
• departure
• microbial
• effective
• hydro
• continuous
• selective
• complete
• wet
• efficient
• reductive
• extensive
• gas
• external