Abstract: A Modular Wastewater Treatment System is disclosed suitable for municipal, domestic and commercial sewage. After separation of the settable solids of the wastewater in the collection system or septic tank or other means the effluent is passed by gravity to the Alternating Nitrification Enhance Reactor where nitrification and de-nitrification process occurs as well as BOD sub.5 and TSS reduction by the participation of a facultative colony. Dosing, recirculation and discharge systems are linked in the alternating and intermittent cycles and facultative process with a gravel media bed to remove the remaining BOD sub.5, TSS and fecal coliform counts of the effluent. The overall system save footprint and it is fully automatic.

Abstract: An on-site wastewater treatment system is disclosed suitable for domestic or other sewage. After separation of the settleable solids from incoming wastewater by means of a septic tank or other means the effluent is passed into a basin holding particles of a media through which the effluent travels. The media bed removes a substantial amount of the suspended solids in the effluent and some of the BOD (biological oxygen demand material). The filtrate is collected and uniformly dispersed, preferably by spraying, over the surface of the same media bed for travel therethrough a second time. The effluent carries oxygen from the air into the media. The media retains the effluent until the surface tension of the effluent between the particles of the media bed is overcome by gravity, at which time it is displaced from the media and discharged. During the retention time aerobic action in the media bed reduces the bacterial count of the effluent significantly.