System for desalinating water with sweeping gas membrane distillation

A system for water desalination, comprising:

• a membrane module, comprising:
• a feed tank configured to receive salt water;
• a heater configured to heat the salt water from the feed tank to form water vapor;
• and
• a membrane distillation unit comprising in order, a feed chamber, a membrane and a vapor chamber, wherein the feed chamber is configured to receive the salt water and the water vapor from the heater, the membrane is configured to let the water vapor pass from the feed chamber through the membrane to the vapor chamber, and the vapor chamber includes an inlet configured to receive a sweeping gas,
• an ejector module, comprising:
• an ejector including a first inlet configured to receive a primary fluid stream and a second inlet configured to receive a secondary fluid stream so that the primary fluid stream and the secondary fluid stream mix to form a mixed stream;
• and
• a freshwater tank configured to receive at least the water vapor of the mixed stream,
• wherein the second inlet of the ejector is connected to an outlet of the vapor chamber so that the ejector is configured to receive the water vapor and the sweeping gas from the vapor chamber as the secondary fluid stream.