Immersed vacuum membrane distillation plant and sewage treatment technology using the same

Abstract

The invention relates to an immersed vacuum membrane distillation plant and a sewage treatment technology using the same. The immersed vacuum membrane distillation plant comprises a raw water storage tank, a gas dissolving pump, a raw water heating water tank, a membrane distillation hydrophobic membrane module, a condenser, a vacuum buffer tank, a vacuum pump, a water producing tank, a valve, a measuring instrument, and an automatic controller. The sewage treatment technology is characterized in that: raw water is subject to pH regulation, microfiltration and other pretreatment, then the pretreated raw water enters into the raw water storage tank, the sewage in the raw water storage tank is subject to gas-water mixing through the gas dissolving pump, and then the gas-water mixture enters into the raw water storage tank for heating to a specific temperature, membrane distillation is carried out at the specific temperature, the produced water after membrane distillation is directly reused, and a little thick water is treated concentrately. According to the invention, the use of the plant in sewage treatment reduces the effect of concentration polarization and temperature difference polarization in the sewage, reduces membrane pollution, increases the membrane distillation flux, prolongs the operation period of the membrane module, reduces the heat loss of the pipeline, and increases the heat utilization rate.

Description

technical field [0001] The invention relates to a sewage treatment device and a sewage treatment method thereof, more specifically, to a submerged vacuum membrane distillation device and a sewage treatment method based on the air-permeable and water-impermeable principle of the hydrophobic membrane technology. Background technique [0002] Due to its ability to remove higher concentrations of salt and higher desalination rate, membrane distillation has gradually attracted the attention of experts from various countries and has carried out extensive research. It can be regarded as the membrane technology with the highest desalination efficiency so far, with a desalination rate of over 99%. Membrane distillation is a hydrophobic membrane technology developed for seawater desalination in the 1980s. It is a new type of membrane separation process that uses a microporous hydrophobic membrane and uses the vapor pressure difference on both sides of the membrane as the driving force....

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Problems solved by technology

In addition, excessive air volume will easily reduce the vacuum degree of the permeate side and increase energy consumption

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