Method for treating high-salt wastewater and recycling nutritive salt through microbial desalination cell

Abstract

The invention discloses a method for treating high-salt wastewater and recycling nutritive salt through a microbial desalination cell. The method comprises the steps of (1) acclimating an anodic microbe under the conditions with high salinity and high ammonium; (2) sequentially assembling a cathode chamber, a recycle chamber and an anode chamber to form a microbial desalination cell, separating the cathode chamber and the recycle chamber through an anion-exchange membrane, separating the anode chamber and the recycle chamber through a cation-exchange membrane, and adopting a carbon brush and an air cathode as an anode material and a cathode material; and (3) inoculating the acclimated anodic microbe to the carbon brush, adopting the high-salt wastewater as an anode chamber water intake matrix, operating the desalination cell by adopting an intermittent water intake and cathode-anode fluid circulation type operation mode, and collecting the nutritive salt through the recycle chamber. According to the method provided by the invention, the degradation of complex organic matters is remarkably promoted, the organic matter removal rate can reach to more than 90 percent along with the increase of ammonium concentration, part of nutritive salt is recycled, the wastewater treatment cost is effectively reduced, and the method is economic and environmental-friendly.

Description

technical field [0001] The invention relates to the technical field of biological treatment of environmental pollution, in particular to a method for treating high-salt wastewater and recovering nutrient salts by a microbial desalination battery. Background technique [0002] High-salt wastewater comes from domestic sewage and industrial wastewater, and contains high levels of inorganic ions (such as Ca 2+ , Na + , SO 4 2- , Cl - , NH 4 + and PO 4 3- etc.), whose total salt content exceeds one percent of the wastewater, and may contain a variety of heavy metal ions, which is a typical highly polluted and difficult-to-treat wastewater. If the high-salt wastewater is discharged directly without treatment, its high concentration of inorganic ions will lead to an increase in the salinity of rivers and lakes, nitrogen, phosphorus, organic matter, etc. will cause eutrophication of the water body, and heavy metal ions will cause biological toxicity. Serious pollution to th...

AI Technical Summary

Problems solved by technology

This method has a wide range of applications and can remove a variety of pollutants deeply and efficiently, but its operation consumes a lot of power

(2) Incineration method: the high-salt nitrogen-containing wastewater is vaporized under high temperature conditions, organic matter, etc. are oxidized by oxygen, while other salt substances crystallize and precipitate, but this method is prone to produce toxic and harmful substances during incineration, and the equipment is seriously corroded

This technical scheme does not recover the nutrient salts in the wastewater, and at the same time, the cathode chamber uses potassium ferricyanide solution, which is directly discharged without treatment, and the environmental benefits are low

In addition, this technical solution cannot adapt to the treatment of wastewater with different high salinity

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