Patent ID: 7153429

Claim:
A computer controller system for denitrification of a wastewater stream, in combination with: an aerobic reactor having an input adapted to receive a wastewater stream and an output adapted to pass out a nitrified wastewater stream; an external air blower system providing air to said aerobic reactor; a denitrification reactor having an input and an output, said input connected to said aerobic reactor and adapted to receive said nitrified wastewater stream, and said output providing means to pass a denitrified wastewater stream out for disposal; comprising: a flow meter connected to said nitrified wastewater stream and adapted to measure the flow of nitrified wastewater from said aerobic reactor to said denitrification reactor; a dissolved oxygen probe connected to said nitrified wastewater stream and adapted to measure dissolved oxygen in said nitrified wastewater; a chemical analyzer connected to said nitrified wastewater stream and adapted to measure and analyze ammonia-nitrogen content, nitrate-nitrogen content, and nitrite-nitrogen content in said nitrified wastewater, said chemical analyzer connected to said denitrified wastewater stream and adapted to measure and analyze nitrate-nitrogen content in said denitrified wastewater; a signal processor adapted to receive, combine and encode an output from said flow meter, said dissolved oxygen probe and said chemical analyzer; a programmable logic controller, said programmable logic controller providing control of said air blower system, said programmable logic controller adapted to receive a signal processor encoded output; and a chemical feed pump connected to said denitrification reactor, said chemical feed pump containing an organic carbon source, said chemical feed pump being controlled by said programmable logic controller.