Words to Describe digesters

How digesters often is described ("________ digesters")

• chinese
• closed
• secondary
• farm
• upright
• liter
• spherical
• mixed
• most
• type
• sludge
• bed
• sulphite
• unheated
• rate
• pressure
• experimental
• anaerobic
• vertical
• aerobic
• methanogenic
• producing
• primary
• small
• patent
• alkaline
• overload
• shaped
• stationary
• size
• huge
• conventional
• cylindrical
• stainless
• lined
• animated
• thermophilic
• growth
• mechanical
• biological
• municipal
• sulfite
• dosed
• marine
• scale
• unlined
• older
• sized
• stage
• separate
• horizontal
• larger
• mesophilic
• static
• fed
• rural
• large
• continuous
• operated
• tank
• efficient
• concrete
• rotary
• heated
• gas
• bio