The present application belongs to the technical field of biology. Provided is a photobioreactor used for algae cultivation, said photobioreactor comprising: a reactor main body, a separation unit, and a first aeration device. The reactor main body is a sealed irregular tubular shape, the separation unit is located within the reactor main body, and divides the reactor main body into two spaces, a left space and a right space, and the first aeration device is connected to a bottom portion of the reactor main body. Also provided is an algae cultivation system, comprising the photobioreactor, the second aeration device, and a temperature control system, and being capable of regulating the temperature of an algae solution.

A system includes a photobioreactor that provides a channel configured to contain an algae slurry, a duct positioned adjacent the channel and configured to convey a gas, and a barrier separating the duct from the channel and providing one or more apertures to allow a portion of the gas to be injected into the algae slurry from the duct.

A belt for an algal growth system includes a flexible sheet material configured to facilitate growth of a biofilm. The flexible sheet material is mounted on a first frame in a first mounted geometry, the flexible sheet material having a substantially vertical orientation when mounted on the first frame such that a first height of the first mounted geometry is greater than a first width of the first mounted geometry, the flexible sheet material being in contact with a contacting liquid.

Algae harvesting and cultivating systems and methods for producing high concentrations of algae product with minimal energy. In an embodiment, a dead-end filtration system and method includes at least one tank and a plurality hollow fiber membranes positioned in the at least one tank. An algae medium is pulled through the hollow fiber membranes such that a retentate and a permeate are produced.

Disclosed is an internally illuminated bioreactor, and related algae production methods, that employ integrated in-water grow light assemblies configured to manage the heat generated by lighting elements, such as light emitting diodes (“LEDs”) on the in-water grow lights. The bioreactor includes an outer shell and one or more in-water grow light fixtures positioned within the outer shell that are positioned around the perimeter of a hollow, internal tube. The lighting elements and internal tube are themselves contained within a preferably clear, exterior tube of the light fixture that allows light generated by the lighting elements to pass through to the algae culture inside of the growth chamber. A heat management system is provided for cooling the light fixture using forced directed through the hollow, internal tube from the top to the bottom of the tube, out from outlets at the bottom of the internal tube, and upward in the fixture through buoyancy of the warmed air, and thus without additional mechanical air handling devices. As the air moves upward between the lighting elements and the exterior tube, it draws additional heat away from the lighting elements. The warmed air is ultimately exhausted from the top of the lighting fixture. Each lighting fixture preferably also includes a cleaning system that enables the automated cleaning of the outer surface of the exterior tube of the lighting fixture, thus preventing newly formed algae from collecting on the lighting fixture and ensuring a continuous flow of light from the fixture into the algae culture throughout algae production.

The present application focuses on systems and methods that utilize one or more carbon dioxide (CO.sub.2) sorbent substrates and a swing cycle, e.g., a moisture swing cycle, to increase the partial pressure of the CO.sub.2 in a gaseous feedstock, which is delivered through a membrane to a bioreactor, such as a membrane carbonation photobioreactor. Such systems and processes offer an effective means for concentrating and capturing CO.sub.2 obtained from air and delivering the concentrated CO.sub.2 to a photobioreactor through a membrane.

Compositions and methods for hydrogen production are disclosed.

Algae harvesting and cultivating systems and methods for producing high concentrations of algae product with minimal energy. In an embodiment, a dead-end filtration system and method includes at least one tank and a plurality hollow fiber membranes positioned in the at least one tank. An algae medium is pulled through the hollow fiber membranes such that a retentate and a permeate are produced.

An alga growing apparatus that includes a gas dissolving portion, an alga tank, first and second LEDs, a supplying portion, and a circulation pump portion. Gas dissolving portion dissolves carbon dioxide and oxygen into deep-ocean water to form growing water. The circulation pump portion sucks out and delivers the growing water and the nori thalli from the alga tank 30 to the gas dissolving portion and injects the growing water and the nori thalli into the alga tank upon passage through the gas dissolving portion and a supply pipe of the supplying portion. The supplying portion discharges the growing water and the nori thalli along a direction obliquely intersecting a curving direction of an inner side surface of the alga tank and the growing water flows inside the alga tank as an eddy flow.

An alga growing apparatus that includes a gas dissolving portion, an alga tank, first and second LEDs, a supplying portion, and a circulation pump portion. Gas dissolving portion dissolves carbon dioxide and oxygen into deep-ocean water to form growing water. The circulation pump portion sucks out and delivers the growing water and the nori thalli from the alga tank 30 to the gas dissolving portion and injects the growing water and the nori thalli into the alga tank upon passage through the gas dissolving portion and a supply pipe of the supplying portion. The supplying portion discharges the growing water and the nori thalli along a direction obliquely intersecting a curving direction of an inner side surface of the alga tank and the growing water flows inside the alga tank as an eddy flow.