Method for treating industrial wastewater

Abstract

The invention discloses a method for treating industrial wastewater. The wastewater is sequentially treated by a water-collecting well, a coarse grid, a flocculation reaction tank, a sloping plate sedimentation tank, a weak electric pulse activation-quenching agglomeration desalting reactor, an aeration tank, a biological oxidation filter tank, a secondary sedimentation tank and a clear water tank. The method creatively utilizes the characteristic that inorganic salts in an aqueous solution have a phenomenon of powdery aggregation when being subjected to the action of weak current; the low-pressure pulse current is applied to the wastewater containing the inorganic salts with higher concentration, and the inorganic salt ions are converged on the magnetized metal surface and are converted into an ionic powder agglomerate which is higher in specific surface energy and thermodynamically unstable; when the aqueous solution is cooled rapidly due to meeting cold air, the ionic powder agglomerate in the solution rapidly undergoes molecular coagulation and gets away from the solution to form a suspended matter, so that the free enthalpy of the entire solution dispersion system is reduced;the salt molecules which are condensed into a suspended matter can be removed from the solution in a precipitation way in a state of being kept at a low temperature.

Description

technical field [0001] The invention relates to a treatment method for removing inorganic salts in iron and steel industry wastewater, which belongs to the field of wastewater treatment in environmental protection. Background technique [0002] In the context of global climate change and energy shortages, low-carbon economic development models based on low energy consumption, low pollution, and low emissions are being valued. The work of energy conservation and emission reduction bears a major responsibility. [0003] As the basic industry of my country's industrial development, the iron and steel industry has become an important force leading the world's iron and steel industry. The scale and development momentum of China's iron and steel industry have attracted worldwide attention. However, the iron and steel industry is both a major water user and a major pollutant discharger. With the rapid development of modern industry, problems such as sharp increase in water consump...

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Problems solved by technology

However, the electro-adsorption desalination technology also has shortcomings, such as the desalination efficiency needs to be further improved, and the self-regeneration time of the electrode is relatively long, generally accounting for one-third of the entire cycle, which affects the water production rate

[0015] At present, the existing methods for treating inorganic salts in iron and steel industry wastewater have problems such as large equipment footprint, frequent and complicated system operation and maintenance, low impact resistance, easy damage to equipment, low desalination efficiency, and secondary pollution.

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