Other

Holmes and Mcgrath, Inc.

Michael B McGrath

Michael J Kenny

Timothy Santos

A method of mixing organic carbon with the final effluent for water treatment systems and applying the mixture to manmade stratified sand filters or natural soils to induce proper conditions for high removal of total nitrogen in the final effluent. In one embodiment, water having a concentration less than about 30 mg/l of Total Nitrogen (TN) and a BODconcentration of less than about 30 mg/l is mixed with a sufficient amount of dissolved carbon to cause a reduction of the nitrogen pollution in the water, and the water and dissolved carbon are percolated through a fixed bed. A method of mixing organic carbon with any water having dissolved TN and applying the mixture to manmade stratified sand filters or natural soils to induce proper conditions for high removal of total nitrogen in the applied water. A method of mixing organic carbon with any water having dissolved TN and applying the mixture to manmade stratified sand filters and applying the water to the soils and inducing in situ denitrification caused by the discharge of water having the proper Carbon to Nitrogen ratio for soil bacterial metabolism and by the discharge of long chained insoluble particular carbon, which degrades in the soils and soil water and provides carbon for denitrification.

Denitrification process

A denitrification system for denitrified wastewater or nitrified water treatment using a detergent or detergent-like compound comprising available carbon. The system comprises a plurality of interconnected tanks including a mixing tank which feeds detention tanks which in combination provide a detention time period for the effluent. A controller determines the amount of detergent dispensed into the mixing tank in accordance with the measured volume of effluent to be treated. The mixing tank comprises a heater for maintaining the nitrified effluent temperature above 50 degrees F. An optional line filter can be added to the output of the system for further reducing organic nitrogen concentration. An alternate embodiment comprises passing the final denitrified effluent through a pump chamber for pumping of the effluent to a sand filter capable of reducing bacterial populations.

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Falmouth, MA, United States of America

Michael B McGrath