This invention belongs to the field of
wastewater treatment technology, specifically relating to a method and apparatus for removing COD from high-salt, high-organic-content
wastewater. The removal method employs two
organic matter retention membranes connected in series to treat the high-salt, high-organic-content
wastewater. By controlling appropriate
process conditions, these
organic matter retention membranes primarily retain
organic matter while retaining as little salt as possible, ensuring stable operation of subsequent processes or achieving compliant wastewater
discharge. Furthermore, the concentrate obtained
after treatment by each organic matter retention membrane is returned in a specific proportion to the inlet of the membrane that produced the concentrate, thereby ensuring efficient and stable membrane operation, improving
system recovery rate, and extending membrane lifespan. This invention achieves COD removal from high-salt, high-organic-content wastewater using only a
single process, exhibiting high removal rate, good decolorization effect, and high
recovery rate. It significantly shortens the process flow and is characterized by being green, efficient, energy-saving,
environmentally friendly, and highly reliable.