Treatment method of industrial heavy metal waste water

Abstract

The invention discloses a treatment method of industrial heavy metal waste water. The treatment method comprises a grit tank, a regulating tank, a comprehensive tank, a buffering tank, a secondary sedimentation tank, an MBR treatment tank, a disinfecting tank and an incinerator. The comprehensive tank of the method is creatively designed, a complete physical process is adopted and comprises the processes such as condensation, adsorption, evaporation, aeration and the like, an absorption column is used as a main treatment unit, the heavy metal in the solution is firstly diffused onto the surface of filler by virtue of a physical way under the electrostatic attraction force or the filler surface adsorption capacity to have simple physical adsorption and to be further diffused into the innerpores, and then the heavy metal is complexed with oxygen-containing functional groups in the filler such as carboxyl and hydroxyl to generate a stable coordination compound, so that an effect for digesting the heavy metal can be realized.

Description

technical field [0001] The invention discloses a method for treating industrial heavy metal wastewater, which belongs to the field of wastewater treatment in environmental protection. Background technique [0002] The problem of heavy metal pollution in my country's water is very prominent, and the pollution rate of the bottom of rivers, lakes and reservoirs is as high as 80.1%. In 2003, the pollution levels of heavy metal-exceeding sections in the top ten river basins including the Yellow River, Huaihe River, Songhua River, and Liaohe River all exceeded Category V. In 2004, the total copper, total lead, and total cadmium contents in the bottom mud of Taihu Lake were all at the level of slight pollution. In the surface sediments of the main stream of the Huangpu River, Cd exceeded the background value by 2 times, Pb exceeded the background value by 1 time, and the Hg content increased significantly; all Pb in Suzhou Creek exceeded the standard, 75% of Cd exceeded the standa...

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Problems solved by technology

[0005] 1. A large amount of sludge produced in this process contains hydrogen sulfide gas. In order to ensure the removal rate of heavy metals, it is often necessary to add excessive sulfide. Excessive sulfide will generate hydrogen sulfide gas under acidic conditions. Hydrogen sulfide The gas is highly poisonous, and it is easy to cause personal injury to the personnel on site

2. The generated heavy metal sulfide is very fine, the sludge particles are fine, and dehydration is difficult

3. The sludge contains a large amount of heavy metal ions such as arsenic and copper. If it cannot be treated in time, the sludge waste will infiltrate and heavy metals will infiltrate into the groundwater, causing secondary pollution. 4. The amount of raw materials and slag is very large. Difficulty in material transportation, huge limestone pretreatment equipment and large area; 5. The strength of the generated gypsum is not enough, and it contains toxic substances such as heavy metals, which makes it difficult to use the gypsum, resulting in a waste of resources

6. The effluent is high-salt sewage, which cannot be reused, which affects the total recycling rate of wastewater

7. The water treatment facilities and equipment are huge, and the combined water treatment system is very large and complicated

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