Operation of an Attached Growth Nitrifying Reactor Under Shock Loads of Ammonia and Activated Sludge Suspended Solids.

Abstract

Crankley Point Sewage Treatment Works, Newark, England treats both municipal and industrial wastes. The introduction of new discharge consents establishes an ammonia standard for the first time. Particular industrial wastes pose constraints to comply with this standard, causing highly varied ammonia loads to pass through the works.Severn Trent Services evaluated the TETRA submerged aerated filter (SAF) and deep-bed filter (DBF) technologies to establish their ability to perform under the following conditions:• Naturally occurring variations in ammonia • Sudden and prolonged spikes in ammonia • Washout from the activated sludge plant.The SAF and DBF technologies coped well under normal diurnal and weekly conditions and responded quickly to sudden high increases in ammonia, maintaining effluent levels for periods of 24 hours and returning to normal levels once shock load conditions ceased.As a result of these trials, Crankley Point Sewage Treatment Works is being extended to incorporate the TETRA SAF and DBF technologies.

Hazardous events in membrane bioreactors – Part 2: Impacts on removal of trace organic chemical contaminants

“…The investigated hazardous events in this study include salinity shock, 2,4-dinitrophenol (DNP) shock, ammonia shock, organic carbon shock, feed starvation, loss of power supply and physical membrane damage. Salinity, organic carbon and ammonia shocks are commonly reported to exhibit short peak loads in full-scale wastewater treatment plants (WWTPs) [21][22][23] so they were selected in this study. DNP shock was selected as a representative peak load caused by discharge of industrial wastewater containing electron inhibitors as it is a well-known inhibitor of efficient energy production in cells with mitochondria [24,25].…”