A sewage treatment apparatus comprises an external box body, the external box body is internally provided with a grid zone, an anaerobic and anoxic zone, an aerobic zone, a settling zone, an advanced treatment zone and a disinfection and sterilization zone communicating in sequence. The grid zone communicates with a household septic-tank through the pneumatic lifting apparatus, the aerobic zone communicates with the anaerobic and anoxic zone to reflux a part of mixed liquid to an anaerobic zone of the anaerobic and anoxic zone, and the settling zone communicates with the anaerobic and anoxic zone to reflux a part of active sludge to an anoxic zone of the anaerobic and anoxic zone; and the sewage treatment apparatus further comprises an apparatus zone which is arranged independently and separately, and the apparatus zone is merely internally provided with an air compressor for providing a conveying pressure.

Disclosed are wastewater treatment systems and methods of treating wastewater. In particular, this disclosure provides a method of lowering the biological oxygen demand, total nitrogen, total suspended solids, and phosphorous within wastewater containing human excrements. In addition to improving the quality of the wastewater on a per Liter basis, this disclosure also provides methods and systems that reduce the absolute quantity of total nitrogen, total suspended solids, and phosphorous released into the environment through effluent. The disclosed methods and systems also provide ways of reintroducing water into the environment.

A septic tank maintenance warning system includes a dwelling and a housing mounted in the dwelling. A processor is mounted in the housing and is programmed with a first time comprising a current date and time. The processor is programmed with a second time comprising a future date and time with respect to the first time. The second time defines an alarm time. The second time is resettable to a new second time only between 5.0 hours and 10.0 years forward of the first time when the second time is reset. An alarm is electrically coupled to the processor and is activated when the second time is attained. The alarm is turned on when the second time is attained. The alarm is turned off only when the processor receives a reset code.

An aerator assembly for wastewater treatment includes a draft tube and an air supply assembly. The draft tube includes a sidewall and presents open top and bottom tube ends. The air supply assembly includes an air supply conduit and a diffuser body. The diffuser body has an inlet aperture and a bubble generator connected to the inlet. The inlet aperture is connected to the air supply conduit such that the bubble generator receives air from a source of air, to which the air supply conduit is connected. The bubble generator has a plurality of air openings for generating fine air bubbles. The diffuser body is sealingly engaged to the sidewall adjacent the bottom tube end so as restrict upward flow of wastewater through the draft tube past the diffuser body.

A grey water treatment system includes a first tank configured to receive grey water via a grey water supply conduit and that comprises an overflow, a second tank configured to store grey water, and at least one transfer conduit configured to at least transfer grey water between the first tank and the second tank. A control is configured to maintain a water level in said first tank sufficiently close to the overflow to allow floating contaminants to pass over the overflow. A method of treating grey water includes: receiving grey water in a first tank of a grey water treatment system; transferring grey water via at least one transfer conduit between the first tank and a second tank of said treatment system; and controlling a water level in said first tank sufficiently close to an overflow of said first tank to allow floating contaminants to pass over the overflow.

A form for a plastic lined septic system distribution box is configured to receive a fill material. The form includes a jacket, a plastic core, a plastic inlet ring, and a plastic outlet ring. The jacket defines an exterior wall and exterior floor of the distribution box. The core defines an interior wall interior floor of the distribution box. The inlet portal ring and outlet portal ring extend between the core interior wall and the jacket exterior wall. The core and jacket are arranged to leave a space therebetween to receive the fill material, and the core is configured to serve as the interior wall and interior floor of the distribution box and to line the fill material for the distribution box during use.

A manufacturing process for a one piece tank that involves three steps results in a consistently watertight and structurally stronger unit than previous tanks. The three steps comprise a process for producing the body of the tank, a process for producing a preliminary lid, and a process for producing the final tank. An important step in the process for producing the body of the tank is extending reinforcing steel (rebar) a distance above the concrete walls of the tank. After the preliminary lid is placed into a groove of the tank, the rebar is bent over the lid and a water stop is applied between the walls of the tank and the preliminary lid. The water stop can be any of several forms. In one form, the water stop is in the form of butyl or rubber strip which projects from the walls of the tank above the walls with the rebar. In an alternate form, the water stop is in the form of a gasket of plastic or other suitable material inserted in a groove at the top of the tank. Once the preliminary lid is in place and the rebar bent over the preliminary lid, reinforcing steel (rebar) is bent over the preliminary lid and secured to proper locations. Then concrete is poured to the top and above the sidewalls of the tank until completely full. The resulting cured structure is a one piece water tight tank with an integral water stop.

A septic tank or aerobic treatment tank level control system has a tank adapted to be connected to a sewage outlet line of a building, a transfer line connected to an outlet of the tank and adapted to extend to a drainfield, a drainfield distribution unit connected to the transfer line, a pump positioned in the tank, a discharge line connected to the pump and connected to the outlet of the tank, and a level switch operatively connected to the pump. The discharge line is adapted to pass the liquid under pressure from the pump through the outlet of the tank and into the drainfield distribution unit. The level switch activates the pump when the liquid in the tank reaches a first level and deactivates the pump when the level of liquid in the tank reaches a second level. The first level is higher than the second level.

The present invention relates to an apparatus for collecting and treating wastewater (1) based on biodegradation-recombination-biodegradation process, comprising: a shell (1.1), the space inside the shell is divided into a first chamber (1.2) and a second chamber (1.3) by a divider wall (1.4), wherein: the first chamber (1.2) contains biological medium suitable for heterotrophic microorganisms growth; the second chamber (1.3) contains biological medium suitable for autotrophic microorganisms and heterotrophic microorganisms growth. The present invention also relates to a system for collecting and treating wastewater combining rainwater drainage used for building, comprising: at least one wastewater treatment apparatus (1) above; a indoor pipe system for collecting and transfering wastewater, rainwater comprising a main vertical pipe (2), substantially horizontal branch pipes; and a outdoor pipe system for transfering wastewater combining rainwater drainage comprising a horizontal pipe (3) for connecting the indoor pipe system for collecting and transfering wastewater, rainwater to at least one wastewater treatment apparatus (1) above.