Passive Underground Drainfield For Septic Tank Nutrient Removal Using Functionalized Green Filtration Media

A method for on-site wastewater treatment comprising:

• providing a horizontal underground cell including baffled compartments and a riser to host an alternating cycle of aerobic and anoxic environments;
• mixing one or more recycled material selected from a group consisting essentially of tires, sawdust and food waste and one or more naturally occurring materials as a green sorption material mixture;
• filling the horizontal underground cell with a green sorption material mixture to provide an anoxic environment;
• and
• providing a piping system for dosing the horizontal underground cell with an influent to sustain the functionality of the green sorption material mixture in the passive drainfield to remove a nutrient content in wastewater.

A passive underground drainfield comprising:

• an underground drainfield filled with a sorption media and portioned by one or more baffles extending above the sorption media to create one or more open channels, the baffles guiding a flow of influent through the open channel into the sorption media;
• a distribution system for directing an influent into the underground drainfield, the distribution system including perforated pipes in each of the one or more open channels to promote aeration to maintain an aerobic condition in each channel;
• an inlet port in each of the one or more channels for drawing air for nitrification for an anoxic and aerobic environment where denitifcation occurs;
• a riser located at one end of the underground drainfield in the sorption media and extending a distance above the sorption media, the riser having a riser height less than a baffle height, the influent directed into each of the one or more open channels passing through the sorption media toward the riser, effluent passing over the riser;
• and
• a perforated outlet pipe on an opposite side of the riser, the effluent passing through the outlet pipes for disposal.