Method for deep treatment of biochemical tail water of coking wastewater
A technology for advanced treatment of coking wastewater, which is applied in the field of wastewater treatment and advanced treatment of coking wastewater. It can solve the problems of secondary pollution effluent COD concentration, etc., and achieve the effects of reducing pollutant dissipation, accelerating sedimentation speed, and reducing effluent COD.
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[0023] Example 1
[0024] figure 1 The method for advanced treatment of biochemical tail water of coking wastewater in this embodiment includes:
[0025] (1) Feed the long flame coal as coal for adsorption into the crusher for crushing to obtain a crushed product with a particle size of 3mm;
[0026] (2) Feed the crushed product into the ore mill for fine grinding to obtain a ground product with a particle size of less than 200 mesh and a material content of 80% by weight, that is, coal powder;
[0027] (3) The coking wastewater with a chemical oxygen demand (COD) value of 198mg / L after biochemical treatment is sent to the mixing tank, and sulfuric acid solution is added to the mixing tank to adjust the pH of the water to 3, which will come from the step ( 2) The grinding product of 30g / L is added to the mixing tank 7 and mixed to obtain a stirred product;
[0028] (4) Send the stirred product from step (3) to the thickener for concentration, and add polyaluminum sulfate 600g / t dry co...
Example Embodiment
[0032] Example 2
[0033] (1) Feed the coking raw material coal of the coking plant into the ore mill for fine grinding, and obtain a grinding product with a particle size of less than 200 mesh and a material content of 83 wt%, namely coal powder;
[0034] (2) The coking wastewater with a chemical oxygen demand (COD) value of 176mg / L after biochemical treatment is sent to the mixing tank, and sulfuric acid solution is added to the mixing tank to adjust the pH of the water to 4, which will come from step ( 1) The grinding product of 1) is added to the mixing tank at a dosage of 50g / L and mixed to obtain a stirred product;
[0035] (3) Transport the stirred product from step (2) to the thickener for concentration, and add polyaluminum sulfate 650g / t dry coal powder and polyacrylamide 40g / t dry coal powder to the thickener to obtain overflow water and Concentrated underflow;
[0036] (4) Feed the concentrated underflow from step (3) into the filter press for pressure filtration and deh...
Example Embodiment
[0038] Example 3
[0039] figure 1 The method for advanced treatment of biochemical tail water of coking wastewater in this embodiment includes:
[0040] (1) Feed coking coal as coal for adsorption into the crusher for crushing to obtain a crushed product with a particle size of 5mm;
[0041] (2) Feed the crushed product into the ore mill for fine grinding to obtain a ground product with a particle size of less than 200 mesh and a material content of 90% by weight, that is, coal powder;
[0042] (3) The coking wastewater with a chemical oxygen demand (COD) value of 234mg / L after biochemical treatment is sent to the mixing tank, and sulfuric acid solution is added to the mixing tank to adjust the pH of the water to 5, which will come from the step ( 2) The grinding product is added to the mixing tank 7 at a dosage of 75g / L and mixed to obtain a stirred product;
[0043] (4) The agitated product from step (3) is sent to a thickener for concentration, and polyaluminum sulfate 680g / t dry ...
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