AHEAD TANK Sewage Treatment Plant STP series are accepted worldwide in accordance with International Maritime Organization (IMO) Resolution MEPC .227 (64) to meet operational requirements referred to in regulation 9 of Annex IV of the International Convention for the Prevention of Pollution from Ships (MARPOL).
AHEAD TANK STP Series also complies with USCG Title 33 (CFR) 159. and (CFR) 1159.97 and may be installed aboard Inspected Vessels.
is a Type II biological aerobic Sewage Treatment System that works with nature to accelerate the normal biological process. Additional oxygen is mixed with the sewage to germinate growth and multiply the naturally occurring bacteria. This action reduces the solids in the sewage. The bacteria uses the reduced particles as their food supply to digest the remaining waste matter. A mild disinfectant solution is added to kill any harmful bacteria before discharging. The system has no internal moving parts that are affected by sewage.
Ahead Tank Type II biological (bacteria/air) Sewage Treatment Systems are constructed of a Durable, Lightweight & Corrosion Proof LLPE (polyethylene) material. AHEAD TANK is the FIRST & ONLY polyethylene Type II Sewage Treatment System constructed with the three necessary internal watertight chambers rotationally molded into the internal structure of a single Tank. This allows the Treatment Process to function equally or better than the traditional steel fabricated systems of today, with the added benefits of being Easier to Handle, a Smaller Footprint, Simpler to Install & Operate & at a fraction of the cost of a steel fabricated system.
USCG-certified marine sewage treatment systems for vessels from 10 to 35 persons.
Up to 10 People / 24 Hours
Up to 10 People / 24 Hours
Up to 18 People / 24 Hours
Up to 25 People / 24 Hours
Up to 35 People / 24 Hours
NOTE: Treatment capacity of the AHEAD TANK is expressed in number of persons per 24 hrs. with toilets that utilize 1 gallon of either fresh or salt water per flush.
Every Ahead Tank uses a proven four-stage aerobic biological treatment process that naturally breaks down sewage before safely discharging treated water overboard. Click each stage below to explore how the treatment system works.
Sewage is aerated as soon as it enters the Aeration Chamber and mixes with the aerated liquid already in the Aeration Chamber. A fine bubble EPDM air diffuser injects air near the bottom of the Aeration Chamber so that the sewage remains in a state of aerobic decomposition. This aerated liquid contains the bacterial sludge that reacts with the sewage to start the reduction process. This movement created by the injected air helps mix the sewage with the bacterial sludge and prevents sludge and sewage solids from settling to the bottom. The air discharged from the surface of the liquid in the Aeration Chamber is vented to the atmosphere through a 1 ½’ FPT connection clearly labeled VENT in black on both sides of the tank.
