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Waste Water Treatment Plant

Waste Water Treatment Terms

⁄ Mesophilic Digester
Optimal operation at a temperature of 100 F (38 C),

⁄ Thermophilic Digester
Optimal operation at a temperatures of 131 F (55 C)

⁄ Hydraulic Retention Time (HRT)
Amount of time water is resident in a process

⁄ Sludge Retention Time (SRT)
Amount of time sludge is held in the digestion

system

⁄ High Rate Digester
Thermophilic Digester with SRT’s of 10–20 days

⁄ Standard Rate Digester
Mesophilic Digester with SRT’s of 20+ days

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