Specific Oxygen Uptake Rate SOUR

Oxygen Uptake Rate Activated Sludge

Because toxicity affects cellular structure and cellular activity, a decrease in the number of active bacteria in the activated sludge process occurs. With a smaller number of active bacteria, less oxygen is consumed as less BOD is degraded. Therefore, a higher dissolved concentration is maintained in the activated sludge process and a decreased specific oxygen uptake rate SOUR occurs Tables 19.19 and 19.20 . SOUR mg hr g VSS is determined by the following calculation DO uptake rate mg liter...

Anaerobic Digester Significant Abiotic And Biotic Factors

Anaerobic Sludge Digester

Significant abiotic factors in the anaerobic digester include ionized ammonia (NH4+), alkalinity, carbon dioxide, hydrogen, nitrate (NO3-), nutrients, pH, quantity and types of substrates, sulfate (SO42-), temperature, toxic wastes, and volatile acids. Significant biotic factors include acetogenic bacteria, fermentative (acid-forming) bacteria, hydrolytic bacteria, methane-forming bacteria, solids retention time (SRT), sulfur-reducing bacteria, and volatile suspended solids (VSS). Within each...