OPEN BOTTOM MULTIPLE CHANNEL GAS DELIVERY DEVICE FOR IMMERSED MEMBRANES

摘要

A gas delivery device has a manifold with an inlet to receive pressurized gas and multiple ports. Each port discharges into a conduit that extends horizontally out from a port. Each conduit has a single opening which may be an open end of the conduit. The area of the ports is less than the area of the conduits. The ports are located closer together than the space between two adjacent outlets. The conduits are preferably open bottomed channels. The manifold may also have an open bottom. The ports may be in the form of open bottom slots. The gas delivery device may be used to supply bubbles to an immersed filtering membrane directly or through a transducer, for example an inverted siphon type intermittent sparger. Pressurized gas is brought into a tank to near or below the bottom of a membrane module, split into multiple individual generally horizontal flows of pressurized gas and released as bubbles in multiple lateral positions.