The present invention is a compact and portable system designed to optimize lightweight biodigesters. The system includes a small sewage receiving tank, at least one small anaerobic digesting tank, and at least one gray water receiving tank, all interconnected for efficient operation. Sewage introduced into the small sewage receiving tank undergoes hydrolysis digestion, where solids settle at the bottom and excess liquids with suspended solids overflow into the small anaerobic digesting tank. This second tank further processes the liquids through acidogenesis, acetogenesis, and methanogenesis digestion stages. The final overflow liquids are directed to the gray water receiving tank for safe disposal. The system also incorporates heating elements, pH controlling apparatus, water filters, and gas release mechanisms, ensuring effective and controlled digestion processes.

Provided is a reciprocating submerged membrane filtration apparatus including: a membrane tank comprising a submerged membrane and configured to intake influent wastewater to be treated, the influent wastewater being filtered through the submerged membrane to produce treated water; and a reciprocation apparatus configured to move the membrane to create an inertia force which shakes foulants off from the submerged membrane under oxygen-deficient conditions, wherein the submerged membrane comprises a microfiltration (MF) membrane or an ultrafiltration (UF) membrane.

A multi-stage anaerobic digester is designed to treat a high solids, stackable feedstock. The system may also receive a pumpable feedstock such as a slurry or sludge. In a first stage, the digestate circulates in one direction around a raceway such that the digestate may pass a feed inlet multiple times before leaving the first tank. An optional side stream loop withdraws fibrous material from near the top of the raceway and return digestate with chopped fibers, preferably lower and further along the raceway. An outlet from the raceway located near, but upstream of, the feed inlet discharges partially digested substrate to a second stage, which is operated as a stirred tank reactor. The two stages may be provided in a single tank with an internal wall separating a ring shaped outer portion from a cylindrical inner portion. The digester may be operated in a thermophilic temperature range.

A fluidized bed reactor for ammonia laden wastewater includes a column, a plurality of carrier particles, a first settling tank and a fluidizing means. The column defines a fluidizing chamber therein, and the fluidizing means is adapted for introducing the ammonia laden wastewater into the fluidizing chamber and further into the first settling tank. The reactor is further provided with microorganisms including nitrifying bacteria, anammox bacteria and heterotrophic denitrifying bacteria attached to the carrier particles. Nitrification reaction, anammox reaction and heterotrophic denitrification reaction are simultaneously taking place in the fluidizing chamber to transform ammonia into nitrogen by the microorganisms. A method for treating ammonia laden wastewater is also provided. The fluidized bed reactor is advantageous in the fact that its start-up is significantly shortened and it is adapted to efficiently treat thin ammonia laden wastewater.

Provided is a reciprocating submerged membrane filtration apparatus including: a membrane tank comprising a submerged membrane and configured to intake influent wastewater to be treated, the influent wastewater being filtered through the submerged membrane to produce treated water; and a reciprocation apparatus configured to move the membrane to create an inertia force which shakes foulants off from the submerged membrane under oxygen-deficient conditions, wherein the submerged membrane comprises a microfiltration (MF) membrane or an ultrafiltration (UF) membrane.

Water treatment systems for year round consistent achievement of less than 2.5 mg/L of total nitrogen from a gray water starting effluent having about 65 mg/L of total nitrogen. The system may include a septic tank, an anaerobic upflow filter (AUF) that receives wastewater from the septic tank, a recirculating media filter (RMF) that receives wastewater from the AUF, and an anoxic denitrification filter that receives wastewater from the RMF. A drain field may be positioned downstream from the denitrification filter for ultimate disposal of the wastewater. The AUF may reduce the biological oxygen demand (BOD), although its presence also aids the combination of the RMF and denitrification filter that follow to consistently achieve <2.5 mg/L of total nitrogen in the system effluent. An equalization tank, recirculation tank, one or more recycle loops, and various pump stations may also be included. The system may be configured as a two-stage system.

Described herein is a method of purifying contaminated fluid influent, the method comprising: providing a reactor comprising a reactor inlet, a reactor outlet, and a purification composition; circulating contaminated fluid influent through the reactor to create a slag-treated fluid; providing a biochemical reactor comprising a biochemical reactor inlet, a biochemical reactor outlet, and a purification media; and circulating the slag-treated fluid through the biochemical reactor to generate a purified fluid. Also described herein is a contaminated fluid influent purification system, comprising: a reactor having a reactor inlet, a reactor outlet, and a purification composition; a biochemical reactor having a biochemical reactor inlet, a biochemical outlet, and a purification media; a settling tank; and a mixing tank; wherein the mixing tank is fluidly connected to a contaminated fluid influent source, the reactor and the settling tank; and wherein the settling tank is fluidly connected to the mixing tank and the biochemical reactor.

Provided are methods for recovering phosphate from wastewater by treating the wastewater with calcium containing compounds to raise its pH to near neutral values in order to precipitate calcium phosphate compounds, such as brushite, from the wastewater.

Wastewater settlement and purification are described. These descriptions include purification of organically contaminated wastewater in aerobically maintained processes and anaerobically maintained processes. The wastewater may flow from aerobic processing zones to anaerobic processing zones to subsequent anaerobic or aerobic processing zones. Anaerobic processing may be promoted by accumulating the wastewater above a barrier and then flowing the wastewater below a curtain and then back up and over edges of the barrier for subsequent purification, discharge, environmental recharge and/or reuse.

A high-load organic wastewater dark fermentation biohydrogen production device and a hydrogen production method are provided. An exhaust port of the production device is communicated with a gas collection region through a gas pipe; a return inlet is arranged at a bottom; a baffle plate is arranged in a two-phase separation device; the baffle plate has a helical shape that makes influent water form a helical centripetal water flow path; one end of an inert gas communicating pipe is connected with an air hole at a bottom of the gas collection region; the other end of the inert gas communicating pipe is communicated with an air intake disc; the inert gas communicating pipe is provided with a connecting hole and an air pump; and the gas collection region is connected with a gas buffer tank and a hydrogen storage tank in sequence. A two-phase separation unit is also provided.