Treatment of Paper Bleaching Wastewater by Electric Heating Tube Electroplating Electrolysis Method

Treatment of Paper Bleaching Wastewater by Electric Heating Tube Electroplating Electrolysis Method

COD is an important indicator reflecting organic pollution of water quality, and the national standard stipulates the use of potassium dichromate heating reflux method. The use of electrolysis for wastewater treatment is a typical field where electrochemical methods have been applied. Through direct or indirect oxidation and reduction in electrochemical reactions, the structure of toxic or difficult to degrade organic compounds can be destroyed to remove their biological toxicity and improve their biodegradability. The electrolysis method for treating wastewater generally does not require the addition of chemicals, and is characterized by simple post-treatment, small footprint, and convenient management. It is known as the clean treatment method.

The current measurement and processing methods have the following drawbacks: long analysis cycle, large workload, high consumption of reagents, and high energy consumption; The use of silver, mercury, and chromium salts in analysis is costly and causes secondary pollution. This project has made some new explorations in the determination of COD and made certain progress. To achieve the goal of reducing costs, reducing pollution, and quickly and accurately measuring. By preparing a simple electrode for electrolytic treatment of papermaking wastewater, the COD removal rate reached about 70%, with good results.

1. Experimental part

1.1 Instruments and reagents

85-1 Magnetic Stirrer (Jiangsu Jintan Medical Instrument Factory), Precision Stable Current Power Supply (Nanjing University Applied Physics Research Institute), Electric Furnace, Sliding Rheostat (0-1KV), Ammeter (0-130mA) oAg2SO4 (Analytical Pure), H2SO4 (98% Analytical Pure), K2Cr207 (Analytical Pure), H9SO4 (Analytical Pure), C121'8N2'H2O Analytical Pure), FeSO47H20 (Analytical Pure), (NH4) 2Fe (SO4) 2.6H20 (Analytical Pure), Potassium Hydrogen Phthalate (Reference Reagent).

1.2 Reagent preparation

1.2.1 Potassium dichromate standard solution

Weigh the reference potassium dichromate 12.2588 that has been dried at 120 for 2 hours in advance, dissolve it in distilled water, transfer it into a 1L volumetric flask, and fix the volume with distilled water, then the concentration of this solution is 0.2500 mol/L. To fully ensure the complete dissolution of potassium dichromate, the beaker should be washed multiple times to avoid residue. And stored in a volumetric flask for about 1 day.

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