Method for treating waste water through coal pyrolysis and dry distillation

Abstract

The invention relates to a method for treating waste water through coal pyrolysis and dry distillation. The method is characterized in that a magnetic material is adopted as a magnetic material adsorbent of a suspended substance and has high adsorbing and gathering capacity on ash suspended substances contained in the waste water, the magnetic material is added to the waste water, slowly stirred and processed according to a process flow, and the process flow is as follows: entering in a waste water pool and then an acidifying pool, ash suspended substance removal through magnetic force adsorption, suspended substance removal through flocculation and sedimentation, oil removal through coalescence and oil-water separation, entering in a three-phase oil-water separator, filtration, dephenolization, ammonia evaporation, COD (Chemical Oxygen Demand) removal through electrooxidation, A / O biochemical treatment, filtration and reclaimed water reclamation. The method disclosed by the invention has the advantages of good magnetic conductivity, simple process and good dust and oil removal effect.

Description

technical field [0001] The invention relates to the treatment of industrial wastewater in the field of coal pyrolysis and carbonization production, and aims to provide a method that can effectively remove ash suspended matter and oil in coal pyrolysis and carbonization wastewater, so that the subsequent treatment section can run better (compared with traditional coal pyrolysis) Compared with dry distillation wastewater treatment process), the entire wastewater treatment process has reduced investment, low operating costs, and a scientific and effective process, specifically involving a coal pyrolysis dry distillation wastewater treatment method. Background technique [0002] China is a big country in the utilization of coal energy, in which coal pyrolysis and carbonization are used to obtain gas and semi-coke, and then the gas is used to produce liquefied natural gas or gasoline and diesel, and semi-coke is used for metal smelting or thermal power generation, which is a good ...

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Problems solved by technology

[0005] The traditional coal pyrolysis and dry distillation wastewater treatment process generally uses flocculants to remove suspended ash in wastewater in the early stage. It is hoped that the ash suspended in wastewater can be flocculated and precipitated, and then the ash suspended in wastewater can be removed by sedimentation and filtration. However, The reality is not ideal, the main reason is that the PH value of coal pyrolysis and carbonization wastewater is either very low or very high, showing strong acidity or strong alkalinity, general flocculants such as PVA, PVC, polyacrylic acid, polyacetamide, polymer Once aluminum chloride is put into this kind of wastewater, the flocculant will soon fail to react with the wastewater, and the purpose of flocculation and sedimentation of ash suspended matter in coal pyrolysis and carbonization wastewater cannot be achieved

Ash suspended solids in coal pyrolysis and dry distillation wastewater mainly exist in the form of ash-in-oil and oil-in-ash. The particle size of ash suspended solids in wastewater is generally very small, and almost 90% of them are below 5 μm. A technology is difficult to remove

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