The Microbiology of Anaerobic Digesters
130 FOAM AND SCUM PRODUCTION AND ACCUMULATION POLYMERS Cationic polymers used upstream of an anaerobic digester for sludge thick ...
SCUM 131 Blankets of scum may form during a start-up or in a mature system. During start- up a thin zone of high volatile acid c ...
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21 Supernatant 133 When sludge is allowed to settle in a digester, a supernatant develops. Anaerobic digester supernatant is com ...
Several operational problems are associated with the presence of high con- centrations of nitrogen and phosphorus. These problem ...
22 Monitoring 135 Extensive analytical monitoring of anaerobic digesters has not been a common prac- tice at many wastewater tre ...
136 MONITORING TABLE 22.1 Recommended Analytical Tests for Anaerobic Digester Content Test ÷Desired Monitoring Frequency Daily W ...
Alkalinity may be added to a digester through chemical addition or changes in operational measures. These measures include trans ...
TEMPERATURE Change in temperature has the most significant impact on the activity of anaerobes and the efficiency of digester op ...
Butyrate and propionate are important intermediates or precursors of methane production. The accumulation of these acids or an i ...
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PART V DIGESTERS ...
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23 Types of Anaerobic Digesters 143 Anaerobic digesters are capable of treating insoluble wastes and soluble waste- waters. Inso ...
Feed sludge Digested sludge Figure 23.1 Completely mixed anaerobic digesters are designed for relatively long HRTs. Feed sludge ...
fixed-film systems hold the bacteria in the digester for relatively long periods and provide for long SRTs and short HRTs. The b ...
146 TYPES OF ANAEROBIC DIGESTERS Biogas Effluent Influent Recycle Figure 23.3 Batch feed Biogas Two-stage, sludge bed filter Eff ...
between the wastes and the bacteria, and can treat wastewaters and sludges over a relatively large range of temperature values ( ...
temperature of the digester contents is approximately the temperature of its sur- rounding environment and varies from season to ...
digester content. Stratification results in the following layers from top to bottom of the digester: gas, scum, supernatant, act ...
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