730
Nitrification Upset Recovery
This is one of the largest wastewater treatment facilities in Northwest Ohio. The population of the service area is approximately 398,000 people.
The plant operates on a 24 hour per day, 7 day per week schedule treating an average flow of approximately 85 MGD. Various preliminary and secondary treatment process are operated at the treatment plant. Liquid stream process include screening, grit removal, pre-aeration, swirl concentrators, primary clarification, aeration, settling, disinfection, and final discharge. Ferrous Salts and polymers are added just prior to primary treatment to remove excess phosphorus.
Sludge treatment processes consist of gravity thickening the primary sludge, dissolved air flotation of the waste activated sludge, digestion of thickened primary and waste activated sludges. The liquid digested sludge is subsequently dewatered by belt filter process.
The secondary activated sludge system is required to achieve nitrification to enable the facility to meet the effluent ammonia discharge limit. Approximately May 1st, a main transformer was damaged resulting un a loss of power to the aeration basin. The lack of dissolved oxygen caused a loss of the nitrification population.
Process operators tried without success for about ten days to reestablish nitrification using the natural population. Then they applied a selected nitrifier from Sybron. Little or no result was achieved.
The next course of action was to use BIO-SYSTEMS NS500 with on-site technical support and service from the local distributor. As observed from the graph below, almost immediate improvement in nitrification was achieved and maintained.
85 MGD
Ammonia PPM
730
Nitrification Upset Recovery
This is one of the largest wastewater treatment facilities in Northwest Ohio. The population of the service area is approximately 398,000 people.
The plant operates on a 24 hour per day, 7 day per week schedule treating an average flow of approximately 85 MGD. Various preliminary and secondary treatment process are operated at the treatment plant. Liquid stream process include screening, grit removal, pre-aeration, swirl concentrators, primary clarification, aeration, settling, disinfection, and final discharge. Ferrous Salts and polymers are added just prior to primary treatment to remove excess phosphorus.
Sludge treatment processes consist of gravity thickening the primary sludge, dissolved air flotation of the waste activated sludge, digestion of thickened primary and waste activated sludges. The liquid digested sludge is subsequently dewatered by belt filter process.
The secondary activated sludge system is required to achieve nitrification to enable the facility to meet the effluent ammonia discharge limit. Approximately May 1st, a main transformer was damaged resulting un a loss of power to the aeration basin. The lack of dissolved oxygen caused a loss of the nitrification population.
Process operators tried without success for about ten days to reestablish nitrification using the natural population. Then they applied a selected nitrifier from Sybron. Little or no result was achieved.
The next course of action was to use BIO-SYSTEMS NS500 with on-site technical support and service from the local distributor. As observed from the graph below, almost immediate improvement in nitrification was achieved and maintained.
85 MGD
Ammonia PPM