A gas-liquid separation device (30) for an anaerobic purification device for purification of wastewater, the gas-liquid separation device comprising: a gas-liquid riser pipe (32); a separation pipe (34) attached to the gas-liquid riser pipe (32), the separation pipe defining an angle with the direction perpendicular to the gas-liquid riser pipe between 45 degrees and +45 degrees, the separation pipe (34) configured to receive fluid from the gas-liquid riser pipe (32); at least one pipe gas outlet (35) located, when assembled with an anaerobic purification device, in a surface along the separation pipe (34) facing away from the ground, the at least one pipe gas outlet (35) configured to lead at least a portion of the gas in the separation pipe (34) outside the gas-liquid separation device; a hydraulic cyclone (36) attached to the separation pipe (34), the hydraulic cyclone configured to receive fluid from the separation pipe; at least one cyclone gas outlet (37) located in the upper side of the hydraulic cyclone (36); the at least one cyclone gas outlet configured to lead the gas entering the hydraulic cyclone (36) outside the hydraulic cyclone; and a liquid outlet (38) attached to the bottom part of the hydraulic cyclone (36), the liquid outlet configured to guide degassed fluid outside the hydraulic cyclone.

A syntrophic enrichment for enhanced digestion (SEED) system is presented, in which a retrofit addition to existing anaerobic digestion infrastructure provides improved digestion process rate and biogas quality. The system provides optimal niche environments for accelerating fermentative, syntrophic and methanogenic metabolisms to increase digestion system loading rates and enhance main digester microbiome. Prescribed media formulations, reactor integrations, and operational methods using various fixed and loose media enhance global digestion system performance. The retrofitted system enables existing plants to transition from an outdated solids-management model to one of valorized biomethane production.

An anaerobic purification device for purification of wastewater, the anaerobic purification device comprising: a reactor tank (10) configured to, when in operation, have a sludge blanket formed at the bottom part; a fluid inlet (12) for, in operation, introducing influent into the reactor tank, the fluid inlet located in the lower section of the reactor tank (10); at least one gas-collecting system (13); at least one gas-liquid separation device (30); at least one riser pipe (22) connected to the at least one gas-collecting system (13) and discharging into the gas-liquid separation device (30); a downer pipe (24) connected to the gas-liquid separation device (30) and discharging into the bottom of the reactor tank (10); and a fluid outlet (16) comprising means for, in operation, varying the height of the fluid level (19) in the reactor tank within a predetermined range, the fluid outlet arranged at the upper section of the reactor tank (10);
wherein the fluid level control means comprises: a fluid valve (15) configured to control the height of the fluid in the reactor tank within the predetermined range, a fluid level detector (17), a gas flow meter (33) configured to measure the production rate of gas in the anaerobic purification device, and
a controlling unit configured to regulate the fluid valve (15) to vary the height of the fluid level in the reactor tank (10) based on at least one of the fluid level detected by the fluid level detector (17) and the gas production rate detected by the gas flow meter (33).

An anaerobic reactor (1) for treating waste water includes a reaction vessel (2) and a three phase separator (4) above the reaction vessel and arranged to receive effluent from the reaction vessel. The three phase separator includes an outer wall (10, 14) connected at its bottom to the top of the reaction vessel and a liquid outlet (42), a lid (16) closing the top of the outer wall. The lid has a gas outlet (17) above the level of the liquid outlet. The three phase separator also includes a funnel (18) arranged above the reaction vessel, a guide wall (30) spaced from and arranged radially outward of the funnel so to surround an upper aperture of the funnel and a baffle wall (36) spaced from and arranged between the guide wall and the liquid outlet.

There is provided herein a roof for a reactor vessel that utilizes a weighted floating cover. The cover is free to move up and down within the vessel as the fluid level changes during the operational cycle. In some embodiment, the cover itself is not directly connected to the reactor vessel or its sidewall, but instead is held in place and supported from above by truss-like support members that permit movement of the cover in concert with the changing fluid level in the vessel. In an embodiment, the support members are anchored proximate to the top of the reactor vessel.

Anaerobic wastewater treatment systems, devices and methods complete three-phase separation of biogas, liquids and solids (e.g., biomass) using overlapped gas hoods or baffles and one or more conically-shaped settlers having a varying cross-sectional area.

An anaerobic reactor (1) for treating waste water includes a reaction vessel (2) and a three phase separator (4) above the reaction vessel and arranged to receive effluent from the reaction vessel. The three phase separator includes an outer wall (10, 14) connected at its bottom to the top of the reaction vessel and a liquid outlet (42), a lid (16) closing the top of the outer wall. The lid has a gas outlet (17) above the level of the liquid outlet. The three phase separator also includes a funnel (18) arranged above the reaction vessel, a guide wall (30) spaced from and arranged radially outward of the funnel so to surround an upper aperture of the funnel and a baffle wall (36) spaced from and arranged between the guide wall and the liquid outlet.

The invention relates to an anaerobic waste water purification tower (21) comprising a sludge reactor (22) with a waste water inlet zone (23), an active zone (24), a first set (25) of three phase separating means for separating sludge, gas and water, comprising at least one layer of adjacent gas hoods (26) connected to a gas collector tank (27) positioned above the reactor (22), and a clean water effluent outlet (31), wherein the gas hoods (26) are hooded lamellas for improving the separation of gas, sludge and water.

An anaerobic purification device for purification of wastewater, the anaerobic purification device comprising: a reactor tank (10) configured to, when in operation, have a sludge blanket formed at the bottom part; a fluid inlet (12) for, in operation, introducing influent into the reactor tank, the fluid inlet located in the lower section of the reactor tank (10); at least one gas-collecting system (13); at least one gas-liquid separation device (30); at least one riser pipe (22) connected to the at least one gas-collecting system (13) and discharging into the gas-liquid separation device (30); a downer pipe (24) connected to the gas-liquid separation device (30) and discharging into the bottom of the reactor tank (10); and a fluid outlet (16) comprising means for, in operation, varying the height of the fluid level (19) in the reactor tank within a predetermined range, the fluid outlet arranged at the upper section of the reactor tank (10);
wherein the fluid level control means comprises: a fluid valve (15) configured to control the height of the fluid in the reactor tank within the predetermined range, a fluid level detector (17), a gas flow meter (33) configured to measure the production rate of gas in the anaerobic purification device, and
a controlling unit configured to regulate the fluid valve (15) to vary the height of the fluid level in the reactor tank (10) based on at least one of the fluid level detected by the fluid level detector (17) and the gas production rate detected by the gas flow meter (33).

Uses of a method of producing small bubbles of gas in a liquid include gas transfer in airlift bioreactors and anaerobic digesters, and particle separation. The method uses a source of the gas under pressure, a conduit opening into a liquid and oscillating the gas passing along the conduit. The oscillation is effected by fluidic oscillator, comprising a diverter that divides the supply into respect outputs, each output being controlled by a control port, wherein the control ports are interconnected by a closed loop. Separation of algae from water involves delivering a laminar flow of microbubbles in the range 10 to 100 m diameter. Such bubbles also deliver a laminar flow in bioreactors that delivers enhanced liquid flow despite the small bubbles, which improves mixing and also enhances efficiency of gas exchange and retention of the bubbles in the reactor.