Method and apparatus for denitrification of water

Apparatus for denitrification of liquid;

• said apparatus comprising:
• a vertical processing tank including:
• a sludge section partially filled with activated sludge;
• said sludge including denitrifying microorganisms capable of converting nitrate into molecular nitrogen, oxygen or oxide gas;
• said sludge section;
• injection means for receiving the liquid and injecting the received liquid into said bottom of said sludge section such that the influent liquid travels helically upward to mix with said sludge;
• a horizontal filter spanning said tank above said sludge and defining said sludge section below;
• for retaining particulates while allowing the liquid to flow upward;
• a biomass section including an outlet;
• and containing anaerobic bacteria;
• said biomass section for receiving effluent from said filter and for denitrifying the received effluent from said filter;
• and
• an oxidation section including:
• a bottom ingress for receiving liquid from said biomass section;
• and
• an air diffuser for bubbling air through the received liquid.

A microbiological process for denitrification of water, consisting of the following steps:

• injecting the impure water into activated sludge in the bottom of a processing tank;
• the sludge including denitrifying microorganisms capable of converting nitrate into molecular nitrogen and oxygen or oxide gas;
• the water is injected so as to travel helically upward to mix with the sludge;
• and
• passing the effluent water from the sludge upward through a horizontal filter to remove particles.

In a vertical processing tank including:

• a bottom section partially filled with activated sludge;
• said bottom section having a bottom having a concave upward facing inner surface;
• a horizontal filter spanning said tank above the sludge and defining said bottom section below;
• for retaining particulates while allowing the liquid to flow through;
• an anaerobic process section including a denitrifying biomass;
• said anaerobic process section disposed above said filter;
• an oxidation section including a diffuser;
• the oxidation section disposed above the anaerobic process section;
• a method for denitrification of liquid;
• said method comprising the steps of:
• injecting the impure water into the activated sludge in the bottom of the processing tank so as to travel helically upward to mix with the sludge;
• filtering the effluent water from the sludge upward through the filter;
• denitrifying the effluent water from the filter under anaerobic conditions with the denitrifying biomass;
• oxidizing the effluent water from the anaerobic biomass in the oxidation section including:
• bubbling air from the diffuser through the effluent water in the oxidation section.