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Packed bed digester

Sludge recycle

Contact digester

Sludge recycle

Packed bed digester

Raw wastewater

Gas Treated effluent

Treated effluent recycle

Upflow sludge blanket digester

Treated effluent

Treated effluent recycle

Gas Treated effluent

Treated effluent recycle

Treated effluent

Upflow sludge blanket digester

Biomass support particles

Raw wastewater ^

Biomass support particles

Raw wastewater ^

Treated effluent

Treated effluent recycle

Expanded bed fixed film digester

FIG. 11.17.5 Schematic diagrams of anaerobic digesters currently in use.

Treated effluent

Treated effluent recycle

Expanded bed fixed film digester

FIG. 11.17.5 Schematic diagrams of anaerobic digesters currently in use.

maintained. Anaerobic degradation can take place in native soils, but in a controlled treatment process, an air-tight reactor is required. Since methane and carbon dioxide gases are formed, it is common to vent the gases or burn them in flare systems. However, volatile hazardous materials could readily escape via such gas venting and flare systems. Thus controlled off-gas burning could be required. Depending upon the nature of the waste to be treated, the off-gas could be used as a source of energy.

Status. Available and widely used in POTWs.

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